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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 53 Abstracts search results
Document:
SP172
Date:
December 1, 1999
Author(s):
Editor: V.M. Malhotra
Publication:
Symposium Papers
Volume:
172
Abstract:
SP-172 The theme of the Third ACI International Conference in Malaysia in 1997 was "High-Performance Design and Materials and Recent Advances in Concrete Technology". Over 90 papers were submitted and reviewed, and 52 were accepted for this publication.
DOI:
10.14359/14170
SP172-01
Richard N. White
The first part of this paper provides a brief review of the critical issues met in replacing deteriorated bridge decks with precast deck systems, drawing on existing papers published by PCI and ACI. Recommended practices for typical bridge rehabilitation projects are provided. The second topic focuses on the rehabilitation of the Tappan Zee Bridge over the Hudson River near New York City. Results are presented for an experimental program conducted on a 10 m span full-scale lightweight concrete slab-steel beam composite bridge deck unit. Loading history included 10 million cycles of flexural fatigue loading, followed by a flexural load capacity test. Measured values of capacity and mid-span deflection at this ultimate load level are compared with simplified analytical predictions.
10.14359/6123
SP172-02
Shuichi Sugita, Qijun Yu, Masami Shoya, Yoichi Tsukinaga and Yasuo lsojima
It was found that highly reactive rice-husk ash (RHA) with more than 40 m2/g BET specific surface could be obtained by the two-step burning method. In this study, concrete specimens with different RHA blending ratios were prepared at different water-cement ratios, then cured in water, 2% HCl solution, and an accelerated carbonating chamber respectively. The results show that after the addition of RHA to the cement not only the strength of concrete is enhanced greatly but also the losses of mass and strength of the concrete cured in the HCl solution and the carbonation rate of concrete were decreased. It was also observed that the resistance of concrete to the penetration of water, air, and chloride-ion can be much improved by using RHA.
10.14359/6124
SP172-03
S. K. Kaushik and S. P. Singh
The paper reports an experimental study on test specimens of Slurry Infiltrated Fibre Concrete (SIFCON) in shear and torsion. The principal variables of the test programme were (a) Aspect ratio and (b) Volume fraction of fibres. The matrix used was freeflowing cement mortar with cement-sand ratio of 1:l. A high range water reducer and set retarding synthetic superplasticiser were used to make the infiltration of mortar possible at a low water/cement ratio of 0.3. The results show an increase in ultimate torque and ultimate shear strength with an increase in fibre content and aspect ratio upto a certain limit beyond which it starts decreasing.
10.14359/6125
SP172-04
Abdullah M. Alshamsi
The effect of silica fume and curing temperatures on the strength of High Strength Concrete (HSC) was investigated. Two concrete mixtures were prepared. The first mixture contained normal portland cement whereas 10% of the cement was replaced by silica fume in the other mixture. W/CM of 0.27 and slump of 40-60 mm were kept constant for both mixtures with the aid of a superplasticizer. Three curing temperatures were maintained throughout the testing age by means of water tanks. They were 20°C 35°C and 50°C. Testing was carried out at 1, 3, 7 , 2 8, 56 and of 90 days of age. The results indicate that while high curing temperatures accelerate strength development at early age, the strength at later ages is adversely affected. Furthermore, the adverse effect was greater in the case of silica fume concrete. The results also show that at 2OC, silica fume concrete produced similar results to other mixture from 7 days onwards. At the other two temperatures, silica fume concrete exhibited (in . general) lower results.
10.14359/6126
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