Practical Building Conservation Mortars, Renders & Plasters
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Specialists Q & a on the Use of Lime Plastering
posed to much less water making it less reactive but retaining its dry nature as a powdered product so it Q To avoid shrinkage, should hair be added to never matures to become a good binder in its own the lime mix? form. Hydrate is used as a plasticiser for cement Hair is added to help lime mortars bind or hold mixes. Hydraulic lime is a powder and also burnt A but the limestone is not pure calcium carbonate onto laths but can still shrink and crack if cured too Specialists Q & A on the and contains impurities such as clays and silicates quickly. Hair is always used on lath and plaster work which change the reactive nature of the lime and but is not necessary on brickwork. use of lime plastering allow it to set chemically when exposed to water. Q How do l make a lime wash? Q What type of lime should be used for lime A Lime wash is simply lime putty, water and a mineral pig- plastering? Q What are the advantages of using lime plas- ment, and for external use a water repellent such as linseed or tallow is added. ter? A Lime plaster can be made with lime putty or hydraulic lime but hydrate is too weak. Putty is best Q Can lime plaster be applied to plasterboard? A They allow buildings to breathe which is essential for ceilings and lath work as it has better flexural for older buildings that have been constructed with strength and sticks well to laths. Hydraulic lime is A The only benefit to applying a lime plaster to lime fine as a hard wall plaster where there is no move- plasterboard is the aesthetic look, however this mortars and soft bricks or stone. -
Plastering Tasks (Construction).Pdf
Year 11 Transition Tasks Plastering Introduction Welcome to the City of Bristol College the following pack is designed to give you an introduction to the types of work and tasks you can expect from a course in plastering. § Positives – Plastering is a great way to keep you fit as It is a very physical job, never in one place for too long meeting new people and has good financial rewards. § Negatives – it is a messy job and can be cold during the winter months. 0117 312 5000 [email protected] cityofbristol.ac.uk @CityofBristolCollege CoBCollege Year 11 Transition Tasks Plasterer The main role of a plasterer is to paste layers of plaster onto walls, floors and ceilings. Both, Internal and External finishes are produced. Plasterers work on a number of different buildings, including new housing developments, offices and houses (redecorations or extensions). They repair or restore existing plasterwork and plaster newly erected walls. The Historic and Fibrous side of plastering involve, plastering using lime and making decorative mouldings for ceilings or walls. The process of creating plasterwork, called plastering, has been used in building construction for centuries. Plasterers have an advantage over some trades during bad weather in that they can work inside. Most plastering tasks are completed before a decorator paints the walls or ceilings. Plasterer at work, then and now. 0117 312 5000 [email protected] cityofbristol.ac.uk @CityofBristolCollege CoBCollege Year 11 Transition Tasks Plasterer’s activities Opening the hyperlinks, I have listed below should give you more information on the activities a plasterer completes on a day-day basis. -
Different Types of Building Limes
Different types of building limes Natural hydraulic limes are made from limestone that contains impurities such as clay or silicates. Unlike lime putty which is non-hydraulic lime, NHLs can set in damp conditions, indeed they require water for a minimum period of around 72 hours to gain maximum strength. They also have some free lime available for carbonation. There are three European classifications NHL 2, NHL3.5 and NHL5 based on the compressive strength of laboratory mortars after 28 days. These are often somewhat misleadingly termed feebly hydraulic, moderately hydraulic and eminently hydraulic. We generally recommend the use of NHLs where the need for breathability and lower strength is outweighed by the desire for an earlier and harder set such as working on bedding hard masonry, wall copings, chimneys and slate floors. In some circumstances hydraulic lime mortars can be used for rendering or plastering. The strength of a hydraulic lime mortar (HLM) varies depending on the manufacturer of the hydraulic lime as some NHL will be high in the band or low. HLM will also vary depending on the ratio of lime binder to aggregate and the type of aggregate or sand used. Natural Hydraulic Lime (NHL) NHL or Natural Hydraulic Lime, comes from limestone that has natural impurities of clay and other minerals, the amount of impurities within it determines how hard it will set. NHL works by setting in the presence of water, hence the term Hydraulic: Natural hydraulic lime powders come in 3 European grades: GRADE STRENGTH(MPa) EXAMPLES OF USE NHL2 >2 to <7 Pointing internally or with soft masonry, plastering NHL3.5 >3.5 to <10 Bedding, pointing NHL5 >5 to <15 Flooring, below DPC or chimney flaunchings NHL's can be used when speed is essential as it sets much quicker than a Lime Putty based mortar. -
The Effect of Linseed Oil on the Properties of Lime-Based Restoration Mortars
Allma Mater Studiiorum – Uniiversiità dii Bollogna DOTTORATO DI RICERCA Science for Conservation Ciclo XXII Settore/i scientifico disciplinari di afferenza: CHIM/12 TITOLO TESI THE EFFECT OF LINSEED OIL ON THE PROPERTIES OF LIME-BASED RESTORATION MORTARS Presentata da: Eva Čechová Coordinatore Dottorato Relatore Prof. Rocco Mazzeo Prof. Ioanna Papayianni Esame finale anno 2009 Abstract THE EFFECT OF LINSEED OIL ON THE PROPERTIES OF LIME-BASED RESTORATION MORTARS The traditional lime mortar is composed of hydrated lime, sand and water. Besides these constituents it may also contain additives aiming to modify fresh mortar´s properties and/or to improve hardened mortar´s strength and durability. Already in the first civilizations various additives were used to enhance mortar´s quality, among the organic additives, linseed oil was one of the most common. From literature we know that it was used already in Roman period to reduce water permeability of a mortar, but the mechanism and the technology, e.g. effects of different dosages, are not clearly explained. There are only few works studying the effect of oil experimentally. Knowing the function of oil in historical mortars is important for designing a new compatible repair mortar. Moreover, linseed oil addition could increase the sometimes insufficient durability of lime-based mortars used for reparation and it could be a natural alternative to synthetic additives. In the present study, the effect of linseed oil on the properties of six various lime- based mortars has been studied. Mortars´ compositions have been selected with respect to composition of historical mortars, but also mortars used in a modern restoration practise have been tested. -
Section 092400
SPEC MIX, Inc. – Guide Specification Note to User: This section contains macros to aid the editing process. By default Microsoft Word disables macros for virus security reasons. When you open a file that has macros, the yellow message bar appears with a shield icon and the enable content button. To enable these macros, click the Enable Content button. SECTION 09 24 00 PORTLAND CEMENT STUCCO (To View Hidden Text, Type CTRL-H) PART 1 – GENERAL 1.1 SECTION INCLUDES A. Portland Cement, Pre-blended Scratch and Brown Coat Stucco. B. Portland Cement, Pre-blended Fiber Base Coat Stucco. C. Portland Cement, Pre-blended Colored Finish Coat Stucco. 1.2 RELATED SECTIONS A. Section 03 30 00 - Cast-in-Place Concrete. B. Section 04 20 00 - Unit Masonry. C. Section 05 40 00 - Cold-Formed Metal Framing: Light gauge load-bearing metal framing. D. Section 06 10 00 - Rough Carpentry: Wood framing. E. Section 07 21 13 - Board Insulation. F. Section 07 92 00 - Joint Sealants. G. Section 09 22 16 - Non-Structural Metal Framing: Non-load-bearing metal framing systems. H. Section 09 22 36 - Metal Lath. I. Section 09 29 00 - Gypsum Board: Exterior gypsum sheathing. 1.3 REFERENCES A. American National Standards Institute (ANSI) / American Hardboard Association (AHA): 1. ANSI/AHA A 194 - Cellulosic Fiber Board. B. ASTM International (ASTM): 1. ASTM A 641/A 641M - Standard Specification for Zinc-Coated (Galvanized) Carbon Steel Wire. 2. ASTM A 653/A 653M - Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc- Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process. -
PORTLAND CEMENT PLASTER Construction Standards PAGE 092400 - 1
Michigan State University PORTLAND CEMENT PLASTER Construction Standards PAGE 092400 - 1 SECTION 092400 - PORTLAND CEMENT PLASTER PART 1 - GENERAL 1.1 M.S.U. ISSUES A. Where construction alterations are to existing facilities, the following shall apply: 1. Patched openings in plaster construction shall be reframed and lathed in as required to maintain original plaster thickness. Areas or openings to be patched shall have the existing finish coat chipped back one inch on base plaster, and base plaster two inches on lath or as required to overlap and bond the new plaster patch to the existing plaster. Areas to be patched or tied into shall be primed with an approved latex bonding-agent in accordance with manufacturer’s recommendation. 1.2 SUMMARY A. This Section includes the following: 1. Nonstructural steel framing and furring. 2. Interior portland cement plasterwork on metal lath plaster bases. 1.3 SUBMITTALS A. Product Data: For each type of product indicated. 1.4 DELIVERY, STORAGE, AND HANDLING A. Store materials inside under cover and keep them dry and protected against damage from weather, direct sunlight, surface contamination, corrosion, construction traffic, and other causes. 1.5 PROJECT CONDITIONS A. Comply with ASTM C 926 requirements. B. Interior Plasterwork: Maintain room temperatures at greater than 40 deg F for at least 48 hours before plaster application, and continuously during and after application. 1. Avoid conditions that result in plaster drying out during curing period. Distribute heat evenly; prevent concentrated or uneven heat on plaster. 2. Ventilate building spaces as required to remove water in excess of that required for hydrating plaster in a manner that prevents drafts of air from contacting surfaces during plaster application and until plaster is dry. -
ADDIS ABABA UNIVERSITY the Effect of Egg and Lime on The
ADDIS ABABA UNIVERSITY ADDIS ABABA INSTITUTE OF TECHNOLOGY SCHOOL OF CIVIL AND ENVIRONMENTAL ENGINEERING The Effect of Egg and Lime on the Compressive Strength of Mortar By: - Neima Yesuf Advisor: - Dr. Esayas G/Yohannes A thesis submitted as a Partial Fulfillment of the Requirements for the degree of Masters of Science in Structural Engineering August 2014 1 Acknowledgment First of all I would like to thank Addis Ababa institute of Technology for giving me this opportunity to conduct this interesting research. And I would like to thank Dr Esayas G/yohannes for giving me great advices during this research. And I would like to give my gratitude for W/t Yewubdar Eshetu, Ato Daniel Kibret, Ato Getachew Asrat, Ato Sirahbizu W/senbet, Ato Wubale, my family and close friends and all those that contributed in different ways in making this research happen. 2 ABSTRACT The Effect of Egg and Lime on the Compressive strength of Mortar Neima Yesuf Addis Ababa University, 2014 In Ethiopia there is a saying that tells buildings like Fasiledes castle of Gondar were built from materials that did not include cement. This saying describes the buildings as made from stones using lime mortar, consisting of sand, lime and egg parts, as a binder. This saying gave a motivation for this research to investigate the effect of egg parts on the compressive strength of mortar. This research concentrates on the effect of egg albumin and egg shell on the compressive strength of mortar since there is already good known material on lime and the effect of the egg albumin and egg shell with regards to cement can be studied on mortar without the addition of aggregates. -
Traditional Architectural Renders on Earthen Surfaces
University of Pennsylvania ScholarlyCommons Theses (Historic Preservation) Graduate Program in Historic Preservation 1991 Traditional Architectural Renders on Earthen Surfaces Maria Isabel G. Beas University of Pennsylvania Follow this and additional works at: https://repository.upenn.edu/hp_theses Part of the Historic Preservation and Conservation Commons Beas, Maria Isabel G., "Traditional Architectural Renders on Earthen Surfaces" (1991). Theses (Historic Preservation). 395. https://repository.upenn.edu/hp_theses/395 Copyright note: Penn School of Design permits distribution and display of this student work by University of Pennsylvania Libraries. Suggested Citation: Beas, Maria Isabel G. (1991). Traditional Architectural Renders on Earthen Surfaces. (Masters Thesis). University of Pennsylvania, Philadelphia, PA. This paper is posted at ScholarlyCommons. https://repository.upenn.edu/hp_theses/395 For more information, please contact [email protected]. Traditional Architectural Renders on Earthen Surfaces Disciplines Historic Preservation and Conservation Comments Copyright note: Penn School of Design permits distribution and display of this student work by University of Pennsylvania Libraries. Suggested Citation: Beas, Maria Isabel G. (1991). Traditional Architectural Renders on Earthen Surfaces. (Masters Thesis). University of Pennsylvania, Philadelphia, PA. This thesis or dissertation is available at ScholarlyCommons: https://repository.upenn.edu/hp_theses/395 'T,' i'&Sim mi> 'm m. i =ir,!t-i^-!vs i )'» \ •.'.i:'-ii-2\c-. fell ;;!•!' UNIVERSITVy PENNSYLVANIA. UBKARIES TRADITIONAL ARCHITECTURAL RENDERS ON EARTHEN SURFACES Maria Isabel G. Beas A THESIS in The Graduate Program in Historic Presen/ation Presented to the faculties of the University of Pennsylvania in Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE 1991 Frank G.lMatero, Associate Professor 'reservation, Advisor X Samuel Y. -
Preserving Historic Ornamental Plaster David Flaharty
PRESERVATION BRIEFS Preserving Historic Ornamental Plaster David Flaharty U.S. Department of the Interior National Park Service Cultural Resources Heritage Preservation Services From the time America struggled for a new identity as the 1930s. During this two hundred year period, as the a constitutional republic-and well into the 20th Georgian and Federal styles yielded to the revivals century-its architecture and its decorative detailing Greek, Rococo, Gothic, Renaissance, and Spanish remained firmly rooted in the European classicism of decorative plaster reflected each style, resulting in the Palladio, Wren, and Mansart. wide variety of ornamentation that survives. The tradi tional methods of producing and installing interior Together with skilled masons and carpenters, orna decorative plaster were brought from Europe to this mental plasterers saw their inherited trade flourish country intact and its practice remains virtually un from the mid-18th century until the Depression years of changed to this day. Fig. 1. Ornamental plaster studios employed the following personnel: Draftsmen to interpret architectural details in shop drawings; sculptors who modelled in clay; model makers who assembled sculpted, plain-run and pre-cast elements into an ornamental unit; moldmakers who made rigid or flexible negative tooling; casters who made production units; finishers (often the caster's wives) who cleaned the casts; and laborers who assisted skilled personnel in operating efficiently. This studio was in Philadelphia, c. 1915. Photo: Courtesy, M. Earle Felber. Styles of Decorative Plaster in America, 18th-20th Centuries d e (a) Kenmore, Fredericksburg, Virginia. c. 1752. Georgian in style with orna mental ceilings based on Batty Langley's 1739 English style book, the plaster work was executed by a Frenchman in the mid-1770s. -
Characterisation and Consolidation of Historical Lime Mortars in Cultural Heritage Buildings and Associated Structures in East Africa
Characterisation and Consolidation of Historical Lime Mortars in Cultural Heritage Buildings and Associated Structures in East Africa Athuman M. K. Ngoma TRIKA-BKN. Bulletin 101, 2009 ISSN 1103-4270 ISRN KTH/BKN/B--101--SE Doctoral Thesis The Artichoke At first glance it seems unappetizing, even forbidding, with the meagre edible matter in its hard exterior. The reward, however, comes in taking it apart, devouring it leaf by leaf. Its leaves slowly become more tender and tastier, until you arrive at the succulent heart. ii ABSTRACT ...........................................................................................................................viii PREFACE ................................................................................................................................ix ACKNOWLEDGEMENTS..................................................................................................... x CHAPTER ONE: INTRODUCTION .................................................................................... 1 1.1 Background and Problem Identification .................................................................... 1 1.2 Restoration of Historical Structure............................................................................. 3 1.3 Objectives, Limitations and Method .......................................................................... 3 CHAPTER TWO: MORTAR AND MORTAR DAMAGE................................................. 5 2.1 Introduction ............................................................................................................... -
NHL Lime Plaster
NHL Lime Plaster St Astier Limes and Mortars telephone: 0800 783 9014 Lime Plaster using St Astier NHL Using St. Astier NHL plastering mortars instead of non hydraulic putty mortars reduces the working time by about 50%. NHL mortars offer similar vapour exchange qualities as putty mortars but are more robust, can be sprayed and used for decorative plasterwork without the addition of gypsum. Requiring less after care than putty, it can be applied in 2 coats on good level backgrounds. Mortar. Plastering in hydraulic lime mortar normally consists of two or three-coat work. Lime plaster made with feebly or moderately hydraulic lime and sand is the basis for this guide. This type of lime sets and hardens predominantly by an hydraulic set and re-absorption of Carbon Dioxide from the air. By its nature the drying and absorption process is slower than gypsum plasters, therefore lime plaster curing should not be hurried allowing approximately 3-5 days per coat depending on the hydraulic lime used. Background. When applying Lime Plaster on the hard, the background will normally be brick or stone. The surface should be clean, free from dust and any organic materials such as lichens etc. Test the surface of masonry backgrounds for dust by applying a piece of masking tape to the background and immediately remove, examine the sticky side for traces materials that may affect the bond between the plaster and the wall. Internal walls can be uneven and rough, often with areas that have been altered. Different background conditions are therefore common and this needs to be addressed before plastering. -
Eco-Plasters Revive the Plasterwork Techniques of the Past
Theme 2 Session 3 ECO-PLASTERS REVIVE THE PLASTERWORK TECHNIQUES OF THE PAST Eunice Salavessa, Lisete Fernandes University of Trás-os-Montes e Alto Douro - UTAD Engineering Department – CETRAD; Chemistry Department – UME; Vila Real, Portugal. [email protected]; [email protected] Ana Maria Duarte LERevPa of Laboratório Nacional de Engenharia Civil – LNEC, Lisboa, Portugal. [email protected] Abstract. Current debates about environmental degradation owing to excessive use and dilapidation of non- renewable resources by the modern construction industry, have led to recent researches about building materials and traditional art of building, to meet sustainable contemporary constructive alternatives. This study is inspired by a revival of traditional plasterwork and outlining developments in plastering; it includes descriptions of old and new techniques and alternative materials, such as industrial wastes with potential for use in decorative plasters. Its main purposes are to evaluate, by laboratorial tests: 1) the advantages of using the industrial waste product of transformation of ornamental stone instead of sand to get a plaster with better performance, as those plasters recommended in historic construction treatises; 2) investigate the decorative potential of optical glass fibers in translucent plasterwork, in contemporary architecture. 1. Introduction Historic renders durable systems must be investiga- included pozzolanic material, with good resistance to ted, to be used in restore and renovation interven- water (Papayianni 2010). tions. Traditional and regional practices are sources of When one translates ancient texts, some questions skill knowledge which can be reactivated in contem- of technological nature rest still to be resolved, with poraneous building construction, contributing to regard to technique terminology or to technological diversify and optimize the design of renders and plas- and scientific content.