DOCSLIB.ORG

CONCRETE TECHNOLOGY CHAPTER 1 1.1 Defination Of

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
CONCRETE TECHNOLOGY CHAPTER 1 1.1 Defination Of CONCRETE TECHNOLOGY CHAPTER 1 1.1 Defination of concrete 1.2 Uses of concrete CHAPTER 2 2.1 Cement 2.1.1 Physical properties of cement 2.1.2 Type of cement2.2 Aggregates 2.2.1 Classification of aggregates 2.2.2 Characteristics of aggregates 2.2.3 Grading of aggregates 2.3 water Page 1 Chapter 1 Cement concrete Introduction 1.1 CEMENT CONCRETE Cement concrete is a product obtained, artificially, by hardening of the mixture of cement , fine aggregates, coarse aggregates and water in a specified pre-determined proportions. The hardening of freshly placed concrete is caused by chemical reaction between water and cement and continue for a long time. Concrete attains full strength with age. To get a”stone like” hardened mass, it is desired to maintain humidity and temperature which can be achived by proper curing. The strength and durability and temperature which can be achived by proper curing. The strength and durability of concrete is dependent upon the quality and quantity of ingredients and also the workmanship involved in performing various operations. The mixture of cement and water is known as mortar.the materials used to make concrete are called as ingredients of concrete (cement, fine aggregates, coarse aggregates and water). The process of making concrete is called as concreting. 1.2 USE OF CONCRETE 1. It is used for the construction of structure, especially the load carrying structural components. 2. It is used for providing damp-proof course. Rich concrete are helpful in controlling dampness. 3. Concrete actually gains strength in presence of of water whereas other materials decay or rot when they become wet. 4. When freshly prepared (green stage) it can be moulded into any shape. 5. Properties of concrete can be tailored depending upon the special requirements of the situation. Page 2 6. It is used for the construction of fir proofing and insulation application , light weight concrete. 7. It can be pumped to greater heights, longer distances and also can be laid into difficult positions. 8. Concrete, as a building material is best suitable for high rising multi-storeyed structures, water storage overhead tanks, industrial sheds, spun pipes, railways sleepers, domes, dams, roads etc. Short answer type question Q1-Define the matrix ? Q2-Define mortar ? Q3-Define reinforced ? Q4-Define concrete technology ? Long answer type question Q1-Explain cement concrete as a construction material ? Q2-Explain the importance of concrete technology ? Q3-write advantages and disadvantages of concrete ? Q4-write various uses of concrete in comparison to other building materia CHAPTER 2 INGREDIENTS OF CONCRETE 2.1 CEMENT Cement is an externally fine material having adhesive and cohesive properties, which provides a binding medium for the discrete ingredients. There is a variety of cementing materials in use for this purpose but the most important one out of many, is a calcareous cement which is obtained by burning together, in a definite proportion, a calcareous (containing calcium carbonate or line) material to a partial fusion at high temperature. Page 3 2.1.1 Physical properties of cement a. Fineness of cement The size of the particles of the cement is its fineness. The required fineness of good cement is achieved through grinding the clinker in the last step of cement production process. As hydration rate of cement is directly related to the cement particle size, fineness of cement is very important. b. Soundness of cement Soundness refers to the ability of cement to not shrink upon hardening. Good quality cement retains its volume after setting without delayed expansion, which is caused by excessive free lime and magnesia. c. Strength of cement Three types of strength of cement are measured – compressive, tensile and flexural. Various factors affect the strength, such as water-cement ratio, cement-fine aggregate ratio, curing conditions, size and shape of a specimen, the manner of molding and mixing, loading conditions and age. While testing the strength, the following should be considered: Cement mortar strength and cement concrete strength are not directly related. Cement strength is merely a quality control measure. The tests of strength are performed on cement mortar mix, not on cement paste. Cement gains strength over time, so the specific time of performing the test should be mentioned. 2.1.2 TYPES OF CEMENT There are various types of cement used in concrete construction. Each type of cement has its own properties, uses and advantages based on composition materials used during its manufacture 1. Ordinary Portland Cement (OPC) 2. Portland Pozzolana Cement (PPC) 3. Rapid Hardening Cement Page 4 4. Quick setting cement 5. Low Heat Cement 6. Sulphates resisting cement 7. Blast Furnace Slag Cement 8. High Alumina Cement 9. White Cement 10. Coloured cement 11. Air Entraining Cement 12. Expansive cement 13. Hydrographic cement 2.2 Aggregates Construction aggregate, or simply "aggregate", is a broad category of coarse to medium grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world. Aggregates are a component of composite materials such as concrete and asphalt concrete; the aggregate serves as reinforcement to add strength to the overall composite material. Due to the relatively high hydraulic conductivity value as compared to most soils, aggregates are widely used in drainage applications such as foundation and French drains, septic drain fields, retaining wall drains, and roadside edge drains. Aggregates are also used as base material under foundations, roads, and railroads. In other words, aggregates are used as a stable foundation or road/rail base with predictable, uniform properties (e.g. to help prevent differential settling under the road or building), or as a low-cost extender that binds with more expensive cement or asphalt to form concrete. HISTORY People have used sand and stone for foundations for thousands of years. Significant refinement of the production and use of aggregate occurred during the Roman Empire, which used aggregate to build its vast network of roads and aqueducts. The invention of concrete, which was essential to architecture utilizing arches, created an immediate, permanent demand for construction aggregates. Page 5 1 Classification of aggregates The variability in density can be used to produce concrete of widely different unit weights, see Table (1). The most common classification of aggregates on the basis of bulk specific gravity is lightweight, normal-weight, and heavyweight aggregates. This section specifically address the different characteristics found in both lightweight and heavyweight aggregates. LIGHTEWEIGHT AGGREGATES As mentioned in the body of this paper, lightweight concrete contains aggregate that is natural or synthetic which weighs less than 1100 kg/m3. The lightweight is due to the cellular or high internal porous microstructure, which gives this type of aggregate a low bulk specific gravity. The most important aspect of lightweight aggregate is the porosity. They have high absorption values, which requires a modified approach to concrete proportioning. For instance, slump loss in lightweight concrete due to absorption can be an acute problem, which can be alleviated by prewetting (but not saturating) the aggregate before batching. HEAVYWEIGHT AGGREGATES: Heavyweight concrete contains aggregates that are natural or synthetic which typically weigh more than 2,080 kg/m3 and can range up to 4,485 kg/m3. Heavy weight aggregate is most commonly used for radiation shielding, counterweights and other applications where a high mass-to-volume ratio is desired. ASTM C637 covers aggregates used for radiation shielding and Table (3) contains the physical properties of heavy weight aggregates. CHARACTERISTICS OF AGGREGATES Resistance to Freeze Thaw: (Important in structures subjected to weathering) – The freeze thaw resistance of an aggregate is related to its porosity absorption, and pore structure. Specifications require that resistance to weathering be demonstrated by the magnesium sulfate test. Abrasion Resistance: (Important in pavements, loading plat-forms, floors, etc.) Abrasion resistance is the ability to withstand loads without excessive wear or deterioration of the aggregate. Chemical Stability: (Important to strength and durability of all types of structures) Aggregates must not be reactive with cement alkalies. This reaction may cause abnormal expansion and mąp-cracking of concrete. Page 6 Particle Shape and Surface Texture: (Important to the workability of fresh concrete) Rough textured or flat and elongated particles, due to their high surface area, require more water to produce workable concrete than do rounded or cubical aggregates. Grading: (Important to the workability of fresh concrete) The grading or particle size distribution of an aggregate is determined by sieve analysis. Specific Gravity (Density): The specific gravity of an aggregate is the ratio of its weight to the weight of an equal volume of water at a given temperature. Most normal weight aggregates have a specific gravity ranging from 2.4 to 2.9. It is not a measure of aggregate quality. It is used for certain computations in a mix design. Absorption and Surface Moisture: The moisture conditions of aggregates are designated as: Oven-Dry: Fully absorbent. Air-Dry: Dry at the surface but containing some interior moisture, thus somewhat absorbent. Saturated Surface-Dry:
Load more

Recommended publications
  • Recycled Concrete Aggregate: Influence of Aggregate Pre-Saturation and Curing Conditions on the Hardened Properties of Concrete
    RECYCLED CONCRETE AGGREGATE: INFLUENCE OF AGGREGATE PRE-SATURATION AND CURING CONDITIONS ON THE HARDENED PROPERTIES OF CONCRETE by Daniel Pickel A thesis presented to the University of Waterloo in fulfilment of the thesis requirement for the degree of Master of Applied Science in Civil Engineering Waterloo, Ontario, Canada, 2014 © Daniel Pickel 2014 AUTHOR`S DECLARATION I hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public. ii ABSTRACT Recycled concrete aggregate (RCA) is a construction material, which is being used in the Canadian construction industry more frequently than it was in the past. The environmental benefits associated with RCA use, such as reduced landfilling and natural aggregate (NA) quarrying, have been identified by industry and government agencies. This has resulted in some incentives to use RCA in construction applications. Some properties of RCA are variable and as a result the material is often used as a structural fill, which is a low risk application. The use of RCA in this application is beneficial from an overall sustainability perspective but may not represent the most efficient use of the material. Efficient use of a material means getting the most benefit possible out of that material in a given application. The initial step in efficient material use is evaluating how a material affects its potential applications. In the case of RCA, this includes its use in concrete as a coarse aggregate.
    [Show full text]
  • Recycled Aggregates in Concrete Production: Engineering Properties and Environmental Impact
    MATEC Web of Conferences 101, 05021 (2017) DOI: 10.1051/ matecconf/201710105021 SICEST 2016 Recycled aggregates in concrete production: engineering properties and environmental impact Mohammed Seddik Meddah* Department of Civil & Architectural Engineering, Sultan Qaboos University, 123 Al-Khod, Oman Abstract: Recycled concrete aggregate is considered as the most abundant and used secondary aggregate in concrete production, other types of solid waste are also being used in concrete for specific purposes and to achieve some desired properties. Recycled aggregates and particularly, recycled concrete aggregate substantially affect the properties and mix design of concrete both at fresh and hardened states since it is known by high porosity due to the adhered layer of old mortar on the aggregate which results in a high water absorption of the recycled secondary aggregate. This leads to lower density and strength, and other durability related properties. The use of most recycled aggregate in concrete structures is still limited to low strength and non-structural applications due to important drop in strength and durability performances generated. Embedding recycled aggregates in concrete is now a current practice in many countries to enhance sustainability of concrete industry and reduce its environmental impacts. The present paper discusses the various possible recycled aggregates used in concrete production, their effect on both fresh and hardened properties as well as durability performances. The economic and environmental impacts of partially or fully substituting natural aggregates by secondary recycled aggregates are also discussed. 1 Introduction future and should be addressed as early as possible. Not only the global climate change but also another very Both natural and processed resources and energy are one serious problem facing the modern society growing is of the most fundamental elements for the daily life of the depletion of non-renewable resources due to their humankind.
    [Show full text]
  • Aggregate and the Environment Was Prepared Under the Sponsorship of the AGI Environmental Geoscience Advisory Committee with Support from the U.S
    ooperative planning by developers, government, and citizens is the key to successful protection and utilization of aggregate resources. AGI gratefully acknowledges the AGI Foundation and the U.S. Geological Survey for their support of this book and of the Environmental Awareness Series. For more information about this Series please see the inside back cover. AGI ENVIRONMENTAL AWARENESS SERIES,8 William H. Langer Lawrence J. Drew Janet S. Sachs With a Foreword by Travis L. Hudson and Philip E. LaMoreaux American Geological Institute in cooperation with U.S. Geological Survey About the Authors William H. Langer has been a research geologist with the U.S. Geological Survey (USGS) since 1971, and has been the USGS Resource Geologist for Aggregate since 1976. He is a member of the Society for Mining, Metallurgy, and Exploration (SME), the American Society for Testing and Materials committees for Concrete Aggregate and Road and Paving Materials, and the International Association of Engineering Geologists Commission No. 17 on Aggregates. He has conducted geologic mapping and field studies of aggregate resources throughout much of the United States. He has published over 100 reports, maps, and articles relating to crushed stone and gravel resources including monthly columns about geology and aggregate resources Foreword 4 It Helps To Know 7 in Aggregates Manager and Quarry. Preface 5 Why Aggregate Is Important 9 Lawrence J. Drew has nearly 40 years of experience working on mineral and petroleum What the Environmental assessment and environmental problems in private Concerns Are 12 industry and with the federal government. Since joining the U.S. Geological Survey in 1972, he has How Science Can Help 12 worked on the development of assessment techniques for undiscovered mineral and petroleum resources.
    [Show full text]
  • Recycled Concrete Usage in Aggregrate Materials
    Washington State Department of Transportation State Construction Office RECYCLED CONCRETE USAGE IN AGGREGATE MATERIALS 2016 ANNUAL REPORT February 14th, 2017 RECYCLED CONCRETE USAGE IN AGGREGATE MATERIALS SUMMARY Engrossed Substitute House Bill (ESHB) 1695 passed the Washington State Legislature in 2015. Section 3 of the Bill requires the Washington State Department of Transportation (WSDOT) to develop and establish objectives and strategies for the reuse and recycling of construction aggregate and recycled concrete materials. New language was added to RCW 70.95.805 that requires WSDOT to “specify and annually use a minimum of twenty-five percent construction aggregate and recycled concrete materials on its cumulative transportation, roadway, street, highway and other transportation infrastructure projects” unless construction aggregate and recycled concrete materials are not readily available or cost-effective. The Bill also required that “The department of transportation and its implementation partners must collaboratively develop and establish objectives and strategies for the reuse and recycling of construction aggregate and recycled concrete materials.” As a first step in addressing these requirements, WSDOT established a core group of implementation partners to assist with the effort. The implementation partners were carefully selected to ensure representation from all the key stakeholders affected by this legislation. The implementation team included the following individuals: Scott Ayers – Graham Construction Jimmy Blais – Gary
    [Show full text]
  • Quantification of Anthropogenic Metabolism Using Spatially Differentiated Continuous MFA Across the Country
    Change Adaptation Socioecol. Syst. 2017; 3: 119–132 Research Article Georg Schiller, Karin Gruhler, Regine Ortlepp* Quantification of anthropogenic metabolism using spatially differentiated continuous MFA https://doi.org/10.1515/cass-2017-0011 across the country. In Germany, such disparities mean that received April 13, 2017; accepted January 16, 2018 there will be a shortfall in RA of 6.3 Gt by the year 2020, Abstract: Coefficient-based, bottom-up material flow while the technically available but unusable RA (due to a analysis is a suitable tool to quantify inflows, outflows regional mismatch of potential supply and demand) will and stock dynamics of materials used by societies, and total 3.2 Gt. Comprehensive recycling strategies have to thus can deliver strategic knowledge needed to develop combine high-quality recycling with other lower-grade circular economy policies. Anthropogenic stocks and flows applications for secondary raw materials. Particularly in are mostly of bulk nonmetallic mineral materials related the case of building materials, essential constraints are to the construction, operation and demolition of buildings not only technical but also local conditions of construction and infrastructures. Consequently, it is important to be and demolition. These interrelations should be identified able to quantify circulating construction materials to and integrated into a comprehensive system to manage help estimate the mass of secondary materials which can the social metabolism of materials in support of circular be recovered such as recycled aggregates (RA) for fresh economy policies. concrete in new buildings. Yet as such bulk materials are high volume but of low unit value, they are generally Keywords: continuous material flow analysis (C-MFA), produced and consumed within a region.
    [Show full text]
  • ENVIRONMENTAL PRODUCT DECLARATION Crushed Stone
    1114 NEPD Ver. 1 2015 ENVIRONMENTAL PRODUCT DECLARATION in accordance with ISO 14025, ISO 21930 and EN 15804 Owner of the declaration: Franzefoss Pukk AS Program operator: The Norwegian EPD Foundation Publisher: The Norwegian EPD Foundation Declaration number: NEPD-1537-527-EN Registration number: NEPD-1537-527-EN ECO Platform reference number: - Issue date: 13.03.2018 Valid to: 13.03.2023 Crushed stone construction aggregate products, Oslo and Bærum Franzefoss Pukk AS www.epd-norge.no NEPD-1537-527-EN Crushed stone construction aggregate products, Oslo and Bærum 1/8 General information Product: Owner of the declaration: Crushed stone construction aggregate products, Oslo and Franzefoss Pukk AS Bærum Contact person: Henrik Bager Phone: +47 482 00 589 e-mail: [email protected] Program operator: Manufacturer: The Norwegian EPD Foundation Franzefoss Pukk AS Postboks 5250 Majorstuen, 0303 Oslo Phone: +47 977 22 020 e-mail: [email protected] Declaration number: Place of production: NEPD-1537-527-EN Bondkall (Oslo) and Steinskogen (Bærum), Norway ECO Platform reference number: Management system: - NS-EN ISO 9001:2015 NS-EN ISO 14001:2015 This declaration is based on Product Category Rules: Organisation no: CEN Standard EN 15804 serves as core PCR 982 153 018 NPCR PART A: Construction Products and Services, 07.04.2017 Statement of liability: Issue date: The owner of the declaration shall be liable for the 13.03.2018 underlying information and evidence. EPD Norway shall not be liable with respect to manufacturer information, life cycle assessment data or evidence. Valid to: 13.03.2023 Declared unit: Year of study: 1 metric ton crushed stone construction aggregate products LCA conducted 2018.
    [Show full text]
  • Effect of Recycled Coarse Aggregate Manufactured from Different Industry
    Effect of recycled coarse aggregate manufactured from different industry waste with mineral admixtures on the fresh and hardened properties of concrete Vimalkumar N Patel1, C D Modhera2, Krunali Savalia3 1Research Scholar, Applied mechanics department, S V National institute of technology, Surat (India) 2Professor, applied mechanics department, S V National institute of technology, Surat (India) 3Assistant Professor, Civil engineering department, Government engineering college, Rajkot (India) ABSTRACT In countries like India and elsewhere, the natural aggregate resources had already reached at alarming rate due to day by day high demand of construction activities in recent years. On the other hand, million tons of construction and demolition (C&D) residues and ceramic wastes are generated which are having hazardous effect on environment. These wastes can be utilized as a partial replacement of natural coarse aggregate in concrete and desired mechanical properties of recycled aggregate concrete can be achieved with the added use of mineral admixtures. Result shows that at 30% replacement level, compressive strength of recycled aggregate concrete is decreased by only 10% which is not significantly different than that of natural aggregate concrete and with 7.5% replacement of cement by Metakaolin can achieve the compressive and tensile strength of optimized recycled aggregate concretes same as that of Natural aggregate concrete. Keywords: Recycled aggregates, Construction and demolition (C&D) waste aggregate, ceramic waste aggregate, Metakaolin I INTRODUCTION The use of natural aggregates in concrete leads to high environmental impacts firstly because of the amount of emissions of CO2 produced during their extraction and secondly because of the depletion of natural resources that this activity implies [1].
    [Show full text]
  • Aggregate Sales Report
    Aggregate Sales Report On Behalf of Tungsten West Abstract: Construction aggregate is a fundamental raw material for all countries. Geological materials have been used in construction since the dawn of time. This is still the case with construction raw materials accounting for the largest volumes of any known production process on the planet. Natural aggregate is the most ubiquitous construction material and is used in buildings, civil engineering projects and transport infrastructure such as roads, railways and airport runways. Author: Paul Nicholls – Panoptic Consultancy Aggregate Sales Feasibility Contents: 1.0 Introduction 2.0 Aggregate overview 3.0 Products on site 4.0 Definitions 5.0 Classification of aggregates 6.0 General road formations 7.0 What products can be produced 8.0 Current market rates 9.0 Current testing regime 10.0 Immediate sales opportunities 11.0 Market potential size, including exports 12.0 Planning permission constraint Drakelands Mine Ref: PC_Feasibility Report_001.v1 Issue Date: 11/02/2020 Version: 1 Uncontrolled When Printing Aggregate Sales Feasibility 1.0 INTRODUCTION 1.1 Following Tungsten West’s recent purchase of Hemerdon Mine, Panoptic Consultancy have identified a high value in the biproduct produced as part of the previous mining operation. This bi-product holds varying values if sold in its current state, however if the bi-product is processed in a certain way, then certificated to the Specification for Highways Works (SHW) namely Series 600 & 800, this former bi-product becomes a highly valuable and sustainable source to support infrastructure project in the UK and abroad. 1.2 The construction aggregates sector is an important part of most modern developed economies.
    [Show full text]
  • Study of Strength and Durability Parameters of Concrete Made Using
    || Volume 6 || Issue 2 || February 2021 || ISSN (Online) 2456-0774 INTERNATIONAL JOURNAL OF ADVANCE SCIENTIFIC RESEARCH AND ENGINEERING TRENDS STUDY OF STRENGTH AND DURABILITY PARAMETERS OF CONCRETE MADE USING FLY ASH AGGREGATES Budda Beeraiah1,Katikala Divyasri2 Assistant Professor, Priyadarshini Institute Of Technology & Management, Guntur, Andhra Pradesh1 M.Tech, Research Scholar, Priyadarshini Institute Of Technology & Management, Guntur, Andhra Pradesh2 ------------------------------------------------------ ***-------------------------------------------------- Abstract:- In this study, the fine and coarse aggregates were completely replaced by fly ash aggregates in fly ash concrete. A mix design was done for M40 grade of concrete by IS method. Ordinary Portland cement of 43 Grade was selected and fly ash aggregates were prepared by mixing fly ash with cement and water. The properties of fly ash fine aggregates and fly ash coarse aggregates were studied. The aggregate crushing value and aggregate impact value of fly ash coarse aggregates were also studied. The fly ash aggregates proportions of 0% , 10%, 20% , 30 % , 40% , 50% by aggregates weight were tried with a suitable water cement ratio 0.45 to get the fly ash aggregates. The concrete cubes, cylinders and beams were cast with the fly ash aggregates obtained from the above six cement fly ash proportions. Then the compressive strength, split tensile strength and flexural strength and durability were tested and compared with control concrete. This paper briefly presents the compressive strength development of fly ash aggregate concrete at different ages. The split tensile strength and flexural strength of all the concrete mix were also investigated at different days of curing. Keywords: Fly ash aggregates (FAA), Compressive Strength, Split tensile strength, Flexural strength, etc.
    [Show full text]
  • The Science and Economics of Concrete
    The Science and Economics of Concrete Presented by © Copyright 2016. Project Cornerstone, Inc. Workshop Sponsors Materials Donors: CalPortland Superior Ready Mix Who is Project Cornerstone? 2nd Most Consumed Commodity by Volume …in the World! #1 Commodity Consumed: Water #2 Commodity Consumed: Construction Aggregate/ Concrete/Asphalt Bridges Rocks Homes Schools Roads Construction Aggregates SAND ● GRAVEL ● CRUSHED STONE Sand and Gravel (Alluvial Sources: riverbeds) Crushed Stone (Stadium/Poway Conglomerate, Peninsula Range and the Santiago Peak Formation) ESS2.A: EARTH MATERIALS AND SYSTEMS How do Earth’s major systems interact? EXAMPLE : WHERE DO YOU FIND SAND AND HOW WAS IT CREATED? Beach – weathering from waves River– alluvial/alluvial fan, weathering from water Desert – sand dunes, weathering from wind ESS3.A: NATURAL RESOURCES How do humans depend on Earth’s resources? DEMAND FOR CONSTRUCTION AGGREGATE Construction Aggregate Uses Other Private Railroads Private Roads Facilities 1% 3% 2% Public Highways, Streets, and Commercial Transit Buildings Other Public 26% 17% Facilities 3% Residential Buildings Water & Sewer 34% 5% Hospitals & Schools Construction 2% Other Public aggregate forms Buildings Utilities the physical foundation 3% 4% of our societal infrastructure. Construction Aggregate Uses Increasing Demand Every person in San Diego County consumes approximately 5.4 tons of aggregate per year. A family of four would need 22 tons per year or almost a { full truck load of material. } San Diego County’s population is expected to
    [Show full text]
  • Life Cycle Inventory of Slag Cement Concrete
    LIFE CYCLE INVENTORY OF SLAG CEMENT CONCRETE Jan R. Prusinski, Medgar L. Marceau and Martha G. VanGeem * ABSTRACT A life cycle inventory (LCI) was determined for concrete with slag cement used as a partial replacement for portland cement. The LCI includes materials, energy, and emissions from extraction of raw materials through the manufacture of one cubic yard of concrete. It does not include the upstream profiles of fuels, although it includes the quantity of fuel used. Five concretes with different performance criteria were considered: 20 and 35 MPa (3000 and 5000 psi) ready mixed concrete, 50 and 70 MPa (7500 and 10,000 psi) precast concrete, and a concrete block mix. The LCI was determined for three combinations of cement for each concrete performance criteria: 100 percent portland cement, and 35 and 50 percent substitution of slag cement for the portland. Energy, CO2 emissions to air, and most other emissions to air are significantly reduced when slag cement is used as a partial replacement for portland cement in concrete. The slag cement mixtures produced an energy savings ranging from 21.1 to 48.4 percent; a savings in carbon dioxide emissions of 29.2 to 46.1 percent; and a virgin material savings of 4.3 to 14.6 percent when compared with 100 percent portland cement concrete mixtures. Keywords: Slag cement, sustainability, life cycle inventory, environment • ACI member Jan Prusinski is Executive Director, Slag Cement Association, Sugar Land, TX • Medgar Marceau is Building Scientist, Building Science and Sustainability, Construction Technology Laboratories, Inc., Skokie, IL • ACI member Martha VanGeem is Principal Engineer, Building Science and Sustainability, Construction Technology Laboratories, Inc., Skokie, IL Presented at Eighth CANMET/ACI Eighth CANMET/ACI 1 International Conference on Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete INTRODUCTION Concrete and Sustainability Concrete is an inherently sustainable material.
    [Show full text]
  • Green Building Evaluation of the Roman Pantheon Using Fuzzy Set Concept
    Green Building Evaluation of the Roman Pantheon Using Fuzzy Set Concept. THESIS Presented in Partial Fulfillment of the Requirements for the Degree Master of Science in the Graduate School of The Ohio State University By Nina Frances Parshall, B.S. Graduate Program in Civil Engineering The Ohio State University 2016 Master's Examination Committee: Dr. Fabian Tan, Advisor Dr. Frank Croft Dr. Lisa Abrams Copyright by Nina Frances Parshall 2016 Abstract This research focuses on the ancient green building evaluation of the Roman Pantheon, use the fuzzy set concept. In today’s society and in the future, there will be pressure from society to continue to make improvements on green building design and construction, and this research aims to advance current green building evaluations. An ancient building, such as, the Roman Pantheon was used for this research because it can provide great insight to ancient design and construction practices, many of which have been forgotten over the years. The green building evaluation first begins with the evaluation of specific green building categories including Site Selection, Use of Water, Energy Conservation, Materials and Resources, Air Quality, and Innovation of Design and Construction. Each category is rated based on the subcategories, which are assigned linguistic rating values. The linguistic values range from extremely non-green to extremely green. After all linguistic ratings are assigned, a weight average is calculated to determine the category rating and the total greenness rating of the Pantheon. While the weighted average can provide a total green building rating for a structure, it does not take into account the unclearly defined linguistic expressions.
    [Show full text]