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Improving Concrete and Mortar using Modified Ash and Slag Cements

Author : Leonid Dvorkin

Publisher : CRC Press

Page : 194 pages

File Size : 34,14 MB

Release : 2020-04-18

Category : Technology & Engineering

ISBN : 1000045250

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Book Description

The use of concrete and mortar containing coal fly ash, blast furnace slag, and other dispersed technogenic materials is one of the major areas of potential resource savings and improving the environmental efficiency and sustainability of construction. Improving Concrete and Mortar using Modified Ash and Slag Cements presents the results of a study of high-tech concrete on composite Portland cement and slag Portland cement. It explains the possibility of significantly improving the properties of cements and concrete with the introduction of superplasticizers and hardening activators. Features: Describes how additives can reduce costs and lead to more environmentally sustainable production Explains the possibility of obtaining high-tech concrete with a high content of ash, slag, and clinker kiln dust Presents the possibility of significant reductions of the most energy-intensive component of cements Examines the calculated dependences for predicting the technical properties of concrete saturated with dispersed technogenic products Explains the methods of calculating the composition of concrete with specified properties of low-clinker cements Suitable for civil and structural engineers as well as for specialists working in the field of concrete technology, students of civil engineering, and researchers of new construction technologies, this book allows readers to understand new and sustainable ways to improve the properties of concrete and mortar by utilizing additives.





High Performance Concrete Optimal Composition Design

Author : Leonid Dvorkin

Publisher : CRC Press

Page : 213 pages

File Size : 46,24 MB

Release : 2023-09-01

Category : Technology & Engineering

ISBN : 1000962768

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Book Description

Concrete and reinforced concrete remain the main building materials for construction of modern fortifications. The book presents experimental and theoretical results allowing production of special high-strength rapid hardening concrete and fiber reinforced concrete. It describes a method for effective proportioning of high-strength fast-setting concrete and fiber reinforced concrete with high dynamic strength as well as selecting proper technological parameters, methodology for design of reinforced concrete structures using such concrete. Particular attention is paid to ensuring the early strengthening of concrete within 24 hours after casting and to constructing structures with limited energy resources at the site.



Fly Ash in Concrete

Author : K. Wesche

Publisher : CRC Press

Page : 270 pages

File Size : 21,34 MB

Release : 1991-06-13

Category : Architecture

ISBN : 1482267055

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Book Description

This book is a state-of-the-art report which documents current knowledge on the properties of fly ash in concrete and the use of fly ash in construction. It includes RILEM Recommendations on fly ash in concrete and a comprehensive bibliography including over 800 references.



Effectiveness of Ternary Blends in Mitigating ASR Demonstrated on the Modified Mortar-Bar Test

Author : F. Bektas

Publisher :

Page : 6 pages

File Size : 22,1 MB

Release : 2016

Category : Alkali-silica reaction

ISBN :

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Book Description

Supplementary cementitious materials (SCMs) are the effective means of improving concrete durability. Combining two SCMs with ordinary Portland cement helps overcome the probable drawbacks of using single SCM. Ternary cementitious systems have become popular in the construction industry, particularly for use in high-performance concrete. In this study, the effectiveness of ternary blends in controlling alkali-silica-reaction (ASR) deterioration was tested in the comparison of a modified mortar-bar method and ASTM C1260-14/C1567-13. Our experiment included the evaluation of 22 binary or ternary combinations of five cementitious materials (Portland cement, metakaolin, low-calcium fly ash, high-calcium fly ash, and slag) tested with two different reactive aggregates. In addition to standard ASTM C1260-14/C1567-13, the mortar mixes were assessed on a modified mortar-bar method of short bars (25 x 25 x 150 mm3) stored at 60°C and >95 % relative humidity. Ternary cementitious blends containing metakaolin and low-lime fly ash proved to be very effective at controlling ASR. In the proposed modified test, a pass/fail criterion of 0.03 % expansion over 60 days was found to be in agreement with the expansion at 14 days of ASTM C1260-14/C1567-13 at 0.10 %.



Potential of Portland-Limestone Cement to Improve Performance of Concrete Made With High Slag Cement and Fly Ash Replacement Rates

Author : J. Shannon

Publisher :

Page : 17 pages

File Size : 26,36 MB

Release : 2016

Category : Fly ash

ISBN :

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Book Description

Aggressive use of supplementary cementitious materials (SCMs) in concrete is becoming more appealing due to potential for cost effectiveness, reduced environmental impact, enhanced durability, and increased sustainability. Constructability, though, is often less attractive as time of set and early strength development can be delayed. This paper investigated the merits of incorporating portland-limestone cement (PLC) to improve concrete sustainability and performance when rounded gravel aggregates (most sustainable for some markets) were used in conjunction with dual SCMs proportioned for 50 % to 70 % total cement replacement. The family of concrete mixtures evaluated have not been widely studied with PLC (in the US or elsewhere). Mixtures containing PLC designed for improved synergies in the US construction market were compared to similar variations containing ordinary portland cement (OPC). PLC was shown to be able to produce concrete mixtures of greater compressive strength and lower set times compared to OPC in some, but not all, conditions. Individual mixture performance varied based on SCM use, PLC properties, and aggregate properties.





Poly(Ethylene Terephthalate) Based Blends, Composites and Nanocomposites

Author : P.M. Visakh

Publisher : William Andrew

Page : 254 pages

File Size : 47,38 MB

Release : 2015-08-24

Category : Technology & Engineering

ISBN : 0128012749

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Book Description

Poly(Ethylene Terephthalate) (PET) is an industrially important material which is not treated specifically in any other book. Poly(Ethylene Terephthalate) Based Blends, Composites and Nanocomposites fills this gap and systematically guides the reader through all aspects of PET and its blends, composites and nanocomposites. It covers theoretical fundamentals, nanocomposites preparation, modification techniques, structure-property relationships, characterisation of the different blends and composites, and material choice for specific applications. Consisting of contributions from experts in the field this book is a useful reference for the researchers and engineers working on the development and characterization of PET materials as well as on implementing them in real-world products. It can also be used as a standard reference for deeper insight in the mechanical, thermal, thermo-mechanical and visco-elastic aspects in product design decisions. Provides a systematic overview on all types of poly(ethylene) terephthalate (PET) based blends, composites and nanocomposites Informs about characterization, structure-property relationships and types of modifications Links material properties to specific applications, enabling engineers to make the best material choice to increase product performance and cost efficiency, in industries ranging from aerospace to energy



Modeling and Computation in Engineering II

Author : Liquan Xie

Publisher : CRC Press

Page : 352 pages

File Size : 25,34 MB

Release : 2013-05-21

Category : Technology & Engineering

ISBN : 1315884917

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Book Description

Modeling and Computation in Engineering II (CMCE 2013, Hong Kong, 22-23 June 2013) includes 50 contributions on modeling and simulation technology, which were presented at the 2nd SREE Conference on Modeling and Computation in Engineering (CMCE 2013) and the 3rd SREE Workshop on Applied Mechanics and Civil Engineering (AMCE 2013), both held in Hong



Pozzolanic and Cementitious Materials

Author : V.M. Malhotra

Publisher : CRC Press

Page : 204 pages

File Size : 18,51 MB

Release : 2004-11-11

Category : Architecture

ISBN : 1482296764

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Book Description

This volume provides an overview of the mineral admixtures used in concrete, including silica fume, slag, rice-husk ash, fly ash and natural pozzolans. It also includes the mineral/chemical composition of the admixtures, their chemical reactions with cement and as a method of recycling.