DOCSLIB.ORG

United States Patent (19) [11] 3,951,885 Thompson (45) Apr

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
United States Patent (19) [11] 3,951,885 Thompson (45) Apr United States Patent (19) [11] 3,951,885 Thompson (45) Apr. 20, 1976 54) METHOD OF MAKING MAGNESIUM 3,238,155 3/1966 Harrell............................. 260/2.5 F OXYCHLORIDE CEMENT COFOAMED 3,354,099 11/1967 Stegeman...................... 260/2.5 AK WITH SYNTHETIC RESIN 3,502,610 3/1970 Thompson...................... 260/2.5 FP 3,607,797 9/1971 Rubens.............. ... 260/2.5 AK 75 Inventor: Henry Clark Thompson, Saratoga, 3,763,070 10/1973. Shearing............ ... 260/2.5 AK Calif. 3,778,304 12/1973 Thompson.......................... 106/107 73 Assignee: Thompson Chemicals, Inc., Palo FOREIGN PATENTS OR APPLICATIONS Alto, Calif. 1,214,478 12/1970 United Kingdom........... 260/2.5 AK 5/1970 United Kingdom........... 260/2.5 AK (22 Filed: Sept. 17, 1973 1,192,864 (21) Appl. No.: 397,833 Primary Examiner-C. Warren Ivy Attorney, Agent, or Firm-Limbach, Limbach & Related U.S. Application Data Sutton 63 Continuation-in-part of Ser. No. 194,557, Nov. 1, 1971, Pat. No. 3,778,304, which is 2 (57) ABSTRACT continuation-in-part of Ser. No. 81 1,616, March 28, A method of making a foamed fireproof product of 1969, abandoned, which is a continuation-in-part of magnesium oxychloride cement and the resulting Ser. No. 589,808, Oct. 27, 1966, abandoned. product. A porous substrate is impregnated with a 52 U.S. Cl........................... 260/2.5 AK; 106/107; foaming mixture of magnesium chloride, magnesium 260/2.5 AJ; 260/2.5 B; 260/2.5 BE; 260/2.5 oxide, and frothing agent in water. The mixture F; 260/2.5 FP; 260/2.5 R hardens with small voids throughout the porous sub 51) int. Cl.’.................... C08K 3/18; C08G 18/14; strate, thus providing a fireproof product of low den C08G 8/22 sity. The cement mixture may be co-foamed with poly 58 Field of Search.................. 260/2.5 AK, 2.5 AJ, urethane foam. The fireproof products of relatively 260/2.5 FP, 2.5 R, 2.5 F, 2.5 B, 2.5 BE; 106/107 low density are particularly valuable for building and construction purposes. Magnesium powder is the pre (56) References Cited ferred frothing agent which, in combination with a surfactant, induces a large volume of small bubbles UNITED STATES PATENTS that remain in the composition as it is set. 3,130,174 4/1964 Lloyd.................................. 106/07 3,21 1,675 10/1965 Johnson ........................ 260/2.5 AK 11 Claims, No Drawings 3,951,885 1 2 Porous magnesium oxychloride cement is disclosed METHOD OF MAKING MAGNESIUM s in U.S. Pat. No. 1,965,538. However, this patent does OXYCHLORIDECEMENT COFOAMED WITH not relate to fireproofing of burnable products. U.S. Pat. No. 2,702,753 relates to a foamed magne SYNTHETIC RESIN sium oxychloride tile having certain other ingredients. CROSS-REFERENCE TO RELATED - ". However, the magnesium oxychloride is not intended APPLICATIONS to fireproof other burnable materials. This application is a continuation-in-part of applica U.S. Pat. No. 3,050,427 shows the use offibrous glass tion Ser. No. 194,557, filed Nov. 1, 197i, now U.S. Pat. in a binder. Of the binders listed in this patent, magne No. 3,778,304 which is a continuation-in-part of appli 10 sium oxychloride cement is suggested as a possibility. cation Ser. No. 81 1,616, filed Mar. 28, 1969, which in However, the patent does not relate to fireproofing turn is a continuation-in-part of application Ser. No. with foamed magnesium oxychloride cement. 589,808, filed October 27, 1966, both now abandoned. SUMMARY OF THE INVENTION AND OBJECTS. BACKGROUND OF THE INVENTION 15 This invention relates to relatively low density burn This invention relates to a process offireproofing and able materials which have been rendered non-burnable the resultant fireproof product. More particularly, it by the even distribution, throughout the burnable ma relates to fireproofing with foamed magnesium oxy terial, of foamed magnesium oxychloride cement. The . chloride cement. .: even distribution of the cement may be accomplished Fireproofing of porous organic materials such as 20 by co-foaming the burnable foam with the foamed insulating board, fiberboard, and the like has long been cement at the same time. The cement is foamed by the a difficult problem. Most chemicals used for fireproof presence of a frothing agent which produces gas bub ing are expensive in the amounts required, so that the bles. economies of fiberboard are lost in preparation of the It is an object of this invention to provide an inexpen commercial fireproof product. Moreover, many of the 25 sive, fireproof porous material having high strength: . materials used for “fireproofing" are in fact simply. properties and low density. m - flame retardants, which resist the spread of flames and It is a further object of this invention to provide an: extinguish the fire by the release of chlorine gas or improved process of manufacturing low density fire other extinguishing material. However, fire retardant proof materials. ... and flame retardant materials do not prevent the burn :30 These and other objects of the invention will appear ing of the organic constituents of the porous substrates. from the following description in which the preferred In many cases, smoke still is given off through the burn embodiments of the invention have been set forth in ing of the cellulose fibers or other organic materials detail. .'; often with the result that severe smoke damage is still possible even though open flames do not break out. 35 A DESCRIPTION OF THE PREFERRED Materials which have layers of fireproof materials EMBODIMENT S. over burnable organic materials, such as gypsum board, Magnesium oxychloride cement (sorel cement) is also suffer shortcomings. Gypsum board is not suitable prepared by the reaction of magnesium chloride, mag for exterior use because of severe sensitivity to water. nesium oxide and water. The literature defines the In addition, the paper backing in gypsum board is burn 40S. reaction according to two net equations: able. Materials like asbestos-cement board are fireproof, 3 MgO + MgCl, + i 1 HO --> 3 Mg(OH), MgCl,8- but they are so expensive and so dense that they have HO not achieved the wide commercial acceptance possible or with low-cost materials. a 45 Magnesium oxychloride cement has been known for 5 MgO + MgCl, + 13 H.O.--> 5 Mg(OH), MgCl,8- many years as a flooring material. However, because of HO - - . ... its density and lack of porosity, it has not been widely used in other applications. It has previously been sug Magnesium oxychloride cement, before it has set, gested to introduce porosity into magnesium oxychlo 50 may be made to froth with the addition of frothing ride cement in U.S. Pat. No. 1,429,451 by the inter agent. By adding a frothing agent during the initial mixing of cork or other light material into the cement reaction period of the oxychloride cement a continuing and thereafter heating to partially decompose the cork froth is obtained which may be impregnated in porous . particles. Still, the product of this patent is so dense materials. The frothing agent continues to form bub that it has not achieved acceptance in the building and 55 bles in the magnesium oxychloride cement within the construction trades for walls, roofing, etc. v porous material until the initial set of the cement takes It has been suggested to make building boards and place, at which time the bubbles are frozen into allow roofing material from magnesium oxychloride cement density fireproof product. in U.S. Pat. No. 1,372,118 by forming magnesium oxy In preparing magnesium oxychloride cement, prefer chloride cement in a foraminous support. However, the 60 to add water to MgCl,.6HO to form a mixture having product obtained is so dense and heavy that its useful a specific gravity of 22 Baume. In practice, this is ness is limited. .''... approximately a 1:1 ratio with water. The specific grav A less dense board is described in U.S. Pat No. ity is important and should not exceed the range of . 1,500,207 where a magnesium oxychloride cement 21.5 and 22.5 Baume where MgCl2.6H,O is used. surface resembling ornamental stone is coated on a 65 About 4% pounds of magnesium chloride is added to fiberboard. However, the cement is only on the surface water to make a gallon of liquid at 22° Baume. It fol and fails to thoroughly wet all the fibers in order to lows that the range of 21.5° and 22.5 Baume is render them fireproof. s' . achieved by roughly the addition of 4 to 5 pounds of 3,951,885 3 4 magnesium chloride with water to make a gallon. In hours. The cement will not be completely set for 24 practice, it is convenient to purchase solutions of mag hours. nesium chloride which are commercially available at The preferred frothing agent is powdered magne about 36' Baume. The desired specific gravity may be sium, which reacts with the oxychloride cement to achieved simply by the addition of water. continuously produce small bubbles. The precise Where other magnesium chloride hydrates are used chemistry of the reaction is not understood, but it is or where small amounts of the magnesium chloride are believed that the reaction gives off hydrogen gas. It is substituted with other cement forming materials (such known that the powdered magnesium continues to as magnesium sulfate), the specific gravity may vary generate gas bubbles until it is consumed. The mere slightly beyond the above specified range. Ordinarily, O entrainment of air bubbles is not satisfactory because no more than 2 or 3 per cent by weight of the total the air invariably escapes to the atmosphere before the cement composition of magnesium sulfate should be cement is set.
Load more

Recommended publications
  • Effect of Admixing Fly Ash on Cementing Characteristics of Magnesium Oxychloride Cement
    International Journal of Recent Technology and Engineering (IJRTE) ISSN: 2277-3878, Volume-9 Issue-5, January 2021 Effect of Admixing Fly Ash on Cementing Characteristics of Magnesium Oxychloride Cement Rekha Sharma, R. N. Yadav Abstract: Investigations pertaining to the effect of admixing The manufacturing process of MOC binders is not only free different amounts of fly ash on setting characteristics and from any carbon dioxide gas emissions, but due to carbon compressive strength of magnesium oxychloride cement has been sequestration potential, these binders actually act as “sinks” carried out in this paper. For this purpose, two different dry mix for atmospheric carbon dioxide [13]. The important compositions (1:0 and 1:1) of magnesia and dolomite were commercial applications of MOC binders include floorings prepared and 5 %, 10 %, 15 % and 20 % fly ash were added in dry mixes. The dry mixes were then gauged with 24 °Be of industries and hospitals, grinding wheels and wall concentration of magnesium chloride gauging solution. It was insulation panels due to its marble like gloss. The industrial observed that initial and final setting times of cement blocks tend applications of MOC cement has been limited because of the to increase with increasing amount of fly ash in dry mix. MOC associated problems of poor water resistance, volume cement blocks of 1:1 composition admixed with fly ash displayed instability, cracking and sweating etc. The magnesium good cementing characteristics. oxychloride binder system exhibits excellent bonding Keywords: Compressive strength, fly ash, Gauging solution, capacity to a large variety of organic and inorganic Inert filler, MOC, Setting time.
    [Show full text]
  • Identification of Magnesium Oxychloride Cement Biomaterial Heterogeneity Using Raman Chemical Mapping and NIR Hyperspectral Chem
    www.nature.com/scientificreports OPEN Identifcation of Magnesium Oxychloride Cement Biomaterial Heterogeneity using Raman Received: 12 February 2018 Accepted: 14 August 2018 Chemical Mapping and NIR Published: xx xx xxxx Hyperspectral Chemical Imaging Ronan M. Dorrepaal & Aoife A. Gowen The present study investigated spatial heterogeneity in magnesium oxychloride cements within a model of a mould using hyperspectral chemical imaging (HCI). The ability to inspect cements within a mould allows for the assessment of material formation in real time in addition to factors afecting ultimate material formation. Both macro scale NIR HCI and micro scale pixel-wise Raman chemical mapping were employed to characterise the same specimens. NIR imaging is rapid, however spectra are often convoluted through the overlapping of overtone peaks, which can make interpretation difcult. Raman spectra are more easily interpretable, however Raman imaging can sufer from slower acquisition times, particularly when the signal to noise ratio is relatively poor and the spatial resolution is high. To overcome the limitations of both, Raman/NIR data fusion techniques were explored and implemented. Spectra collected using both modalities were co-registered and intra and inter-modality peak correlations were investigated while k-means cluster patterns were compared. In addition, partial least squares regression models, built using NIR spectra, predicted chemical-identifying Raman peaks with an R2 of up to >0.98. As macro scale imaging presented greater data collection speeds, chemical prediction maps were built using NIR HCIs. Magnesium oxychloride (MOC) cements were frst reported by Sorel in 18661. Several MOC cement crystal phases exist, however only two phases form below 100 °C.
    [Show full text]
  • Carbon Dioxide Uptake by MOC-Based Materials
    applied sciences Article Carbon Dioxide Uptake by MOC-Based Materials OndˇrejJankovský 1, Michal Lojka 1, Anna-Marie Lauermannová 1, Filip Antonˇcík 1, Milena Pavlíková 2, Zbyšek Pavlík 2 and David Sedmidubský 1,* 1 Department of Inorganic Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic; [email protected] (O.J.); [email protected] (M.L.); [email protected] (A.-M.L.); fi[email protected] (F.A.) 2 Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague 6, Czech Republic; [email protected] (M.P.); [email protected] (Z.P.) * Correspondence: [email protected]; Tel.: +420-2-2044-4122 Received: 6 March 2020; Accepted: 24 March 2020; Published: 26 March 2020 Featured Application: The highest potential of magnesium oxychloride cement (MOC) is its capability to be used as a component of low-energy building composite materials while acting as a CO2 sink. The results of this contribution also show that MOC can be used as a binder in advanced building materials that have particular properties, and therefore specific application potentials. Formation and hardening of this material are rather fast, so the material can be used in quick repairs as well as a protection layer. This property is also beneficial for use in prefabrication, due to the possibility of unmolding after a shorter time compared to Portland cement (PC) materials, so the whole production process can be considered more effective. Somewhat significant importance should be given to its ability to capture CO2, which not only makes it more eco-friendly, but also improves its mechanical properties.
    [Show full text]
  • Caustic Magnesia Cement
    AUG 8 1924 DEPARTMENT OF COMMERCE Circular OF THE Bureau of Standards S. W. STRATTON. Director No. 135 CAUSTIC MAGNESIA CEMENT PRICE, S CENTS Sold only by the Superintendent of Documents, Government Printing Office, Washington, D. C. WASHINGTON GOVERNMENT PRINTING OFFICE 1922 CAUSTIC MAGNESIA CEMENT. (Also called magnesite cement, magnesia cement, magnesium oxychloride cement, Sorel cement, plastic magnesia cement, and light calcined magnesia cement.) ABSTRACT. A brief summary of the discovery, early history, and later application of the reac¬ tion of caustic magnesia with solutions of magnesium chloride. The result of this reaction produces a quick-hardening cement used in the stucco, flooring, and ship decking trade. Short descriptions are given of the ore used, of methods of calcining the ore, also suggested formulas for several types of products, the general qualities of these, and the lines along which specifications for the cement are being developed. CONTENTS. Page. I. Introduction. i II. Early history and chemistry of caustic magnesia cement. 2 III. Magnesite. 5 1. Occurrence. 5 2. Nature. 5 3. Impurities. 6 IV. Caustic magnesia. 6 V. Uses of caustic magnesia cement. 8 1. Flooring. 8 2. Stucco. 9 3. Ship decking. 10 VI. Specifications..'. 11 1. INTRODUCTION. iVlthough the cementing material produced by the reaction of magnesite calcined at a low temperature with a solution of mag¬ nesium chloride has been known for somewhat more than half a century, its commercial utilization has been decidedly hampered by the secrecy maintained by those who have made a commercial success of its use. The products of caustic magnesia cement are before the public under numerous proprietary names, frequently with no indication as to the essential ingredients.
    [Show full text]
  • Additives in Sorel Cement Based Materials - Impact Study
    Proceedings of the International Conference on Civil, Structural and Transportation Engineering Ottawa, Ontario, Canada, May 4 – 5, 2015 Paper No. 318 Additives in Sorel Cement Based Materials - Impact Study Anna Tatarczak Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland [email protected] Stanislaw Fic Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland [email protected] Abstract: The subject of the research is the effect of micro-silica and polypropylene fibre additives on the physical and mechanical properties of composite materials (‘concrete’) made using oxychloride magnesium (Sorel) cement. The research aimed to improve the durability of the materials by incorporating these additives. The work shows the effects of these additives on compressive strength, corrosion and waterproofing properties. The addition of micro- silica was found to improve compressive strength by ~17.5% and to reduce water absorption. The addition of polypropylene appeared to increase compressive strength but only within the measurement uncertainties and also reduced water absorption. An additive concentration of x 10 the optimum polypropylene caused a ~x 4 reduction in compressive strength. Keywords: Sorel Cement, Materials properties, Micro silica, Polypropylene fibres 1. Introduction Significant industrial development has been achieved through the introduction of new solutions for the use of other materials added to concrete to improve its properties. Complying with the needs of modern Europe the use of industrial waste is increasing to reduce environmental pollution and in recent years this has been the subject of extensive research work. Additive materials from waste affect concrete’s mechanical properties and thus can contribute to useful waste disposal.
    [Show full text]
  • An Experimental Study on Potential of Magnesium Oxychloride Cement with Bagasse As an Additive
    AN EXPERIMENTAL STUDY ON POTENTIAL OF MAGNESIUM OXYCHLORIDE CEMENT WITH BAGASSE AS AN ADDITIVE A THESIS Submitted in partial fulfillment of the requirements for the award of the degree of MASTER OF TECHNOLOGY IN STRUCTURAL ENGINEERING Under the supervision of Mr. SAURAV Assistant Professor By Pawan Gupta (152656) TO JAYPEE UNIVERSITY OF INFORMATION TECHNOLOGY WAKNAGHAT, SOLAN – 173234 HIMACHAL PRADESH, INDIA MAY, 2017 i CERTIFICATE This is to certify that the work which is being presented in the project title “An Experimental Study on potential of magnesium oxychloride cement with bagasse as an additive” in partial fulfillment of the requirements for the award of the degree of Master of technology in Civil Engineering with specialization in “Structural Engineering” and submitted to the Department of Civil Engineering, Jaypee University of Information Technology, Waknaghat is an authentic record of work carried out by Pawan Gupta (152656) during a period from July 2016 to May 2017 under the supervision of Mr. Saurav, Assistant Professor, Department of Civil Engineering, Jaypee University of Information Technology, Waknaghat. The above statement made is correct to the best of my knowledge. Date: ……………….. Dr. Ashok Kumar Gupta Mr. Saurav External Examiner Professor & Head of Department Assistant Professor Civil Engineering Department Civil Engineering Department JUIT Waknaghat JUIT Waknaghat ii ACKNOWLEDGEMENT I would like to express my gratitude and appreciation to all those who gave us the possibility to complete this report. A special thanks to my final year project Guide, Mr. Saurav, (Assistant Professor, Department of Civil Engineering) who helped me to stimulating suggestions and coordinate my project especially in writing this report.
    [Show full text]
  • Magnesium Oxychloride Cement Concrete
    Bull. Mater. Sci., Vol. 30, No. 3, June 2007, pp. 239–246. © Indian Academy of Sciences. Magnesium oxychloride cement concrete A K MISRA* and RENU MATHUR Central Road Research Institute, New Delhi 110 020, India MS received 15 November 2006; revised 11 May 2007 Abstract. The scope of magnesium oxychloride (MOC) cement in concrete works has been evaluated. MOC cement concrete compositions of varying strengths having good placing and finishing characteristics were prepared and investigated for their compressive and flexural strengths, E-values, abrasion resistance etc. The durability of MOC concrete compositions against extreme environmental conditions viz. heating–cooling, freezing–thawing, wetting–drying and penetration and deposition of salts etc were investigated. The results reveal that MOC concrete has high compressive strength associated with high flexural strength and the ratio of compressive to flexural strength varies between 6 and 8. The elastic moduli of the compositions studied are found to be 23–85 GPa and the abrasion losses between 0⋅11 and 0⋅20%. While alternate heating–cooling cycles have no adverse effect on MOC concrete, it can be made durable against freezing–thawing and the excessive exposure to water and salt attack by replacing 10% magnesium chloride solution by magnesium sulphate solution of the same concentration. Keywords. Oxychloride cement concrete; magnesium sulphate; flexural strength; durability. 1. Introduction Despite many merits associated with this cement, its poor resistance to excessive exposure to water has restricted its Magnesium oxychloride cement (Sorell’s cement) is one of outdoor applications. There are only a few reports available the strongest cement possessing certain advantages over worldwide on MOC cement concrete.
    [Show full text]
  • Magnesium Oxychloride Cement-Based Foam Insulation : A
    REFERENCE A11102 5bl2S0 NBS & TECH R.I.C. NATL INST OF STANDARDS 26 PUBLICATIONS All 102561 280 iviagnesium Oxychloride Cement-Based Foam Insulation: Review of Available Information and Identification of Research Needs Walter J. Rossiter, Jr. Robert G. Mathey U.S. DEPARTMENT OF COMMERCE National Bureau of Standards National Engineering Laboratory Center for Building Technology Gaithersburg, MD 20899 Interim Report June 1986 Prepared for: U.S. Department of Energy Office of Conservation and 'able Energy — QC lependence Ave., SW 200 ton, DC 20585 - U 5 B 86-3326 1986 MBS RESEARCH INFORMATION CENTER KJg>^C NBSIR 86-3326 ts s 0 Q.LIO0 OXYCHLORIDE MAGNESIUM i c? CEMENT-BASED FOAM INSULATION: A z\o, REVIEW OF AVAILABLE INFORMATION 'V b AND IDENTIFICATION OF RESEARCH I b NEEDS Walter J. Rossiter, Jr. Robert G. Mathey U.S. DEPARTMENT OF COMMERCE National Bureau of Standards National Engineering Laboratory Center for Building Technology Gaithersburg, MD 20899 Interim Report June 1986 Prepared for: U.S. Department of Energy Office of Conservation and Renewable Energy 1000 Independence Ave., SW Washington, DC 20585 U.S. DEPARTMENT OF COMMERCE, Malcolm Baldrige, Secretary NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director ' TABLE OF CONTENTS ABSTRACT . ...... iv 1. INTRODUCTION ....... 1 1.1 Background 1 1.2 Objectives 4 1.3 Scope of the Study 4 2. MANUFACTURE OF MAGNESIUM OXYCHLORIDE FOAM INSULATION . 5 3. MAGNESIUM OXYCHLORIDE CEMENT .............. 7 3.1 Chemistry .................... 7 3.2 Uses of Magnesium Oxychloride Cement ....... 9 4. PROPERTIES OF MAGNESIUM OXYCHLORIDE FOAM INSULATION . 13 5. DISCUSSION 16 5.1 Characterization of the Insulation -- Research Needs ................ 16 5.2 Standards ...........
    [Show full text]
  • Investigations on the Properties of Magnesium Oxychloride Cement Produced by in Situ and Classic Methods
    International Journal of Metallurgical & Materials Science and Engineering (IJMMSE) Vol.2, Issue 1 (2012) 1-11 © TJPRC Pvt. Ltd., INVESTIGATIONS ON THE PROPERTIES OF MAGNESIUM OXYCHLORIDE CEMENT PRODUCED BY IN SITU AND CLASSIC METHODS Y. Karimi 1a and A. Monshi b aM.Sc Student , b Professor, Department of Materials Engineering , Isfahan University of Technology, Isfahan, 8415683111, Iran ABSTRACT In this research, magnesium oxychloride cement was produced by two methods, one with a classic method by using MgCl 2 in MgO- MgCl 2- H2O system and the other one with in situ method by using HCl in ternary system of MgO- HCl- H2O. The compressive strength of the cements was measured after the 10th day. The comparison of the mechanical properties of the cements showed that the cement which was produced by the classic method, MgO- MgCl 2- H2O, had low strength properties with respect to the in situ cement, MgO- HCl- H2O, with the same composition. In situ production of magnesium oxychloride cement was significantly related to the heat reaction of MgO with HCl and setting time of the cement. The strength development of the cement which was produced by in situ method was due to the optimum formation of the needle shaped crystals of phase 5MgO·MgCl 2·8H 2O in cement system. The morphology and microstructure of the phases were characterized by using scanning electron microscope (SEM). Bulk densities were also measured. X-Ray diffraction (XRD) of matrix phases was investigated. 1 - [email protected] Tel: + 98 9127412383 Fax: +98 3113912750 Y. Karimi and A.
    [Show full text]
  • Magnesium Oxychloride Boards: Understanding a Novel Building Material
    Magnesium oxychloride boards: understanding a novel building material Aiken, T., Russell, M., McPolin, D., & Bagnall, L. (2020). Magnesium oxychloride boards: understanding a novel building material. Materials and Structures, 53, [118]. https://doi.org/10.1617/s11527-020-01547-z Published in: Materials and Structures Document Version: Publisher's PDF, also known as Version of record Queen's University Belfast - Research Portal: Link to publication record in Queen's University Belfast Research Portal Publisher rights Copyright 2020 the authors. This is an open access article published under a Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited. General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws. If you discover content in the Research Portal that you believe breaches copyright or violates any law, please contact [email protected]. Download date:26. Sep. 2021 Materials and Structures (2020) 53:118 https://doi.org/10.1617/s11527-020-01547-z (0123456789().,-volV)(0123456789().,-volV) ORIGINAL ARTICLE Magnesium oxychloride boards: understanding a novel building material Timothy A.
    [Show full text]
  • The Application Review of Magnesium Oxychloride Cement
    Available online www.jocpr.com Journal of Chemical and Pharmaceutical Research, 2014, 6(5):180-185 ISSN : 0975-7384 Research Article CODEN(USA) : JCPRC5 The application review of magnesium oxychloride cement Hongxia Qiao, Qianyuan Cheng, Wang Jinlei and Shi Yingying Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, China _____________________________________________________________________________________________ ABSTRACT Due to its qualities of being light, high-strength, and good resistance to abrasion, magnesium oxychloride cement is used extensively in China and abroad, but simultaneously, its large-scale use has been limited due to its disadvantages of poor water resistance, easy to buckling deformation and corrosive to rebar. The paper not only introduces the advantages and disadvantages of Magnesium Oxychloride Cement, but also outlines the domestic research overview and prospered development prospects of magnesium oxychloride cement. Keywords: Magnesium Oxychloride Cement; Resistance to Water; Corrosive; Buckling Deformation; Moisture Absorption and Efflorescence. _____________________________________________________________________________________________ INTRODUCTION Magnesium oxychloride cement (also known as Sorel cement) is a type of gelled material which was invented by a Sweden scholar named Sorrell in 1876. It is made up of the light roasting MgO 、MgCl 2 and H 2O in certain proportions. Hardened Magnesium oxychloride cement mainly constitutes of MgCl 2·8H 20(5·1·8) 、 3Mg(OH) 2·MgCl 2·8H 20(3·1·8) and Mg(OH) 2, or the remaining MgO(room temperature). The natural gas hydrates formation is related to the ratio of 3 components [1-2] . Because of its good performance, environmental protection and energy saving benefits, Magnesium oxychloride cement and its products have wide application prospect, but in the process of production and application, magnesium oxychloride cement products have a series of problems.
    [Show full text]
  • Magnesia-Based Cements: a Journey of 150 Years, and Cements for the Future? Sam A
    This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited. Review pubs.acs.org/CR Magnesia-Based Cements: A Journey of 150 Years, and Cements for the Future? Sam A. Walling and John L. Provis* Immobilisation Science Laboratory, Department of Materials Science & Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom ABSTRACT: This review examines the detailed chemical insights that have been generated through 150 years of work worldwide on magnesium-based inorganic cements, with a focus on both scientific and patent literature. Magnesium carbonate, phosphate, silicate-hydrate, and oxysalt (both chloride and sulfate) cements are all assessed. Many such cements are ideally suited to specialist applications in precast construction, road repair, and other fields including nuclear waste immobilization. The majority of MgO-based cements are more costly to produce than Portland cement because of the relatively high cost of reactive sources of MgO and do not have a sufficiently high internal pH to passivate mild steel reinforcing bars. This precludes MgO-based cements from providing a large-scale replacement for Portland cement in the production of steel-reinforced concretes for civil engineering applications, despite ff the potential for CO2 emissions reductions o ered by some such systems. Nonetheless, in uses that do not require steel reinforcement, and in locations where the MgO can be sourced at a competitive price, a detailed understanding of these systems enables their specification, design, and selection as advanced engineering materials with a strongly defined chemical basis.
    [Show full text]