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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 90 Abstracts search results
Document:
SP132
Date:
May 1, 1992
Author(s):
Editor: V.M. Malhotra
Publication:
Symposium Papers
Volume:
132
Abstract:
SP-132 Published in two volumes...The first volume contains papers dealing with fly ash and natural pozzolans. The second volume consists of papers dealing with condensed silica fume and ferrous and non-ferrous slags.
DOI:
10.14359/14164
SP132-35
Akthem A. Al-Manaseer, Muir D. Haug, Moir D.Haug and Lionel C. Wong
Study examines the microstructure properties of cement-based grout consisting of Type II rapid-hardening portland cement, Saskatchewan fly ash, and brine. The liquid brine is composed mainly of salts of sodium, calcium, potassium, and magnesium obtained from an underground potash mine. A scanning electron microscope (SEM), with an electron probe x-ray microanalyzer, was used to study the mechanism by which fly ash and brine alters the microstructure characteristics of cement grouts under confining pressures of 0, 3.4, and 6.9 MPa (0, 500, and 1000 psi). The SEM examination was conducted at 7, 14, and 365 days. This examination revealed that grout mixes containing brine had a gel-like substance covering the entire surface of the hydrated products. The probe x-ray microanalyzer identified the gel-like substance as consisting mainly of sodium chloride salt. Fly ash cement particles were also found to be encapsulated by the sodium chloride gel-like substance. This encapsulation may decrease the rate of pozzolanic reaction between fly ash particles and the lime available in the cement. Microscopic examination of specimens mixed with brine also showed the presence of long fibrous crystals with diameters ranging from 3 to 20 æm growing on the surface of the gel-like substance. Generally, at 7 and 14 days, the fly ash-cement grouts were found to have more such fibers than the grout containing no fly ash. This trend reversed at 365 days.
10.14359/2093
SP132-88
J. Hrazdira
Gypsumless Portland cements (GPC) are inorganic binders, which may be described aas system of: ground Portland clinker (specific surface of 400-500 m2/kg - Blaine), a surface-active agent with hydroxyl groups and a hydrolyzable alkali metal salt (carbonate, bicarbonate, silicate). New cements, developed in recent years, are able to reach both higher strengths and fracture toughness than ordinary Portland cement (1,2,3). New developments in the making of very strong cements have resulted from modifying cement compositions and manipulating the microstructures (4).
10.14359/17147
SP132-89
C. Alfes
In High-Strength Concrete in general high-quality aggregate is used. This aggregate has a high compressive strength and often a high modulus of elasticity. This high modulus of elasticity of the aggregate strongly influences the deformation behaviour of high-strength concrete. Results show that there is a direct and linear relationship between the shrinkage value and the modulus of elasticity of the concrete. The highest modulus of elasticity of concrete was 85 GPa. The compressive strength at the age of 28 days was in the range from 102 to 182 MPa. A design aid is given to show the interrelation between modulus of elasticity and shrinkage strain of the concrete on one side and modulus of elasticity of the aggregate, modulus of elasticity of the matrix and matrix content on the other side.
10.14359/17148
SP132-76
S. Nagataki, T. Sone, and A. Matsui
This paper describes the characteristics of a super low-heat cement mixing the ternary components of cement, blast-furnace slag, and nace slag cement modifying portland blast-furnace slag cement into a low-heat type. The results of mass concrete model experiments conducted using these cement are also reported. The super low-heat cement used in furnace slag: fly ash at ratios of 23:50:27. The low-heat blast-furnace slag cement was a 60% mixture of blast-furnace slag in normal portland cement. In the experiments concerning characteristics of concrete, concretes using super low-heat cement or low-heat blast-furnace portland cement or portland blast-furnace slag cement Class B. Mass concrete model experiments were compared for the cases of using super low-heat cement, and portland blast-furnace slag cement Class B. According to the test results, in case of unit cement content of 300 kg/m2, the adiabatic temperature rise of concrete using super low-heat cement is approximately 15°C lower than the moderate heat portland cement. That of concrete using low-heat blast-furnace slag cement is approximately 5°C lower than portland blast-furnace slag cement Class B. Mass concrete model experiments show that the strength gain of super low-heat cement concrete is higher than that of conventional low-heat cement concrete, and this cement is effective in control of thermal cracking because of exceedingly low temperature rise.
10.14359/1235
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