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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 6 Abstracts search results
Document:
19-277
Date:
May 1, 2020
Author(s):
Yu-Dong Xie, Xu-Jian Lin, Hong-Hong Ai, and Tao Ji
Publication:
Materials Journal
Volume:
117
Issue:
3
Abstract:
In this study, the impact of expanded perlite (EP) and expanded vermiculite (EV) on the refractory properties of magnesium potassium phosphate cement (MKPC)-based fire-resistant materials were investigated. The physical and mechanical properties of MKPC paste were tested, and its fire retardancy properties were studied in detail. The results indicate that the incorporation of EP or EV to MKPC-based refractories brings a notable improvement in the fire resistance and makes a reduction in the apparent density. However, compared with EV-MKPC, the porosity of EP-MKPC is larger and its moisture content is higher, so the thermal insulation performance of EP-MKPC is better than that of EV-MKPC at the same content.
DOI:
10.14359/51724599
90-M10
January 1, 1993
ACI Committee 544
90
1
Guide describes the current technology in specifying, proportioning, mixing, placing, and finishing of steel fiber reinforced concrete (SFRC). Much of the current conventional concrete practice applies to SFRC. The emphasis in the guide is to describe the differences between conventional concrete and SFRC and how to deal with them. Guidance is provided in mixing techniques to achieve uniform mixtures, placement techniques to assure adequate compaction, and finishing techniques to assure satisfactory surface textures. Sample mix proportions are tabulated. A listing of references is provided covering proportioning, properties, refractory uses, shotcrete technology, and general information on SFRC.
10.14359/4046
85-M02
January 1, 1988
Thomas Novinson and John Crahan
85
Lithium salts have been reported as set accelerators of high-alumina (80 to 90 percent) concretes and mortars. However, it has been determined that the lithium salts also accelerate the setting of medium-alumina (40 percent) concretes containing considerable silica. The reaction rates of the accelerated setting are related to the pH of the lithium salt in the mixing water, the concentration of the lithium salt, and the type of anion in the lithium salt. Proper selection of the lithium salt and the concentration can lead to quick-setting concretes without loss in quality. The nonhalide lithium salts may have an advantage over calcium chloride and other halide-set accelerators that have been found to be highly corrosive to steel reinforcement in concrete. Since the lithium salts act as catalysts and cause hydration of the cement, components without entering the stoichiometry of the reactions, very small amounts of the salts can be used to accelerate the concrete setting reaction.
10.14359/2471
JL69-01
January 1, 1972
ACI Committee 308
Journal Proceedings
69
Curing is defined as the process of maintaining a satisfactory moisture content and a favorable temperature in concrete during hydration of the cementitious materials so that desired properties of the concrete are developed. Two systems of providing the required moisture are explained in detail: (I) main-taining a moist environment by application of water; and (2) prevention of IOSS of mixing water by use of sealing materials. Basic principles of successful curing are outlined, and commonly accepted methods, procedures, and materials are described. Recommendations are given for curing pavements and other slabs on ground; for structures and buildings: and for mass concrete. For each of these categories, methods, materials, time and temperature of curing are recommended. Brief sections comment on curing requirements for precast products, shotcrete, preplaced aggregate concrete, refractory concrete, plaster and other applications.
10.14359/11244
JL68-25
April 1, 1971
68
4
Curing is defined as the process of maintaining a satisfactory moisture content and a favorable temperature in concrete during hydration of the cementitious materials so that desired properties of the concrete are developed. Two systems of providing the required moisture are explained in detail: (1) main-taining a moist environment by application of water: and (2) prevention of loss of mixing water by use of sealing materials. Basic principles of successful curing are outlined, and commonly accepted methods, procedures, and materials are described. Recommendations are given for curing pavements and other slabs on ground; for structures and buildings: and for mass concrete. For each of these categories, methods, materials, time and temperature of curing are recommended. Brief sections comment on curing requirements for precast products, shotcrete, preplaced aggregate concrete, refractory concrete, plaster, and other applications.
10.14359/11324
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