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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 48 Abstracts search results
Document:
SP200-20
Date:
June 1, 2001
Author(s):
T. Horiguchi, H. Okumura, and N. Saeki
Publication:
Symposium Papers
Volume:
200
Abstract:
bleeding; bottom ash; CLSM; compressive strength; deterioration; durability; flowability; fly ash; freezing and thawing; frost heaving; mix proportioning; slump flow; used foundry sand
DOI:
10.14359/10587
SP200
V.M. Malhotra
Self-compacting concrete, recycled concrete as aggregate, calcium nitrate accelerators—these are just a few of the topics covered in the 47 papers included in ACI SP-200, Fifth CANMET/ACI International Conference on Recent Advances in Concrete Technology. You’ll be able to compare the structural performance of full-scale columns using ordinary and self-compacting concretes and with stirrup configurations representing differing degrees of confinement. You’ll also learn about a procedure that improves the quality of concrete made using aggregate produced from recycled concrete, and about experiments showing that, at 5 °C, calcium nitrate is a much more effective accelerator than calcium chloride. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP200
10.14359/14008
SP200-15
F. Clemmens, P. Depuydt, H. Justnes, D. Van Gemert, and E. J. Sellevold
The influence of a number of calcium salts on the total chemical shrinkage (used as a measure of cement hydration) of different portland cement pastes was followed during the first 48 hours. All calcium salts (acetate, chloride, formate, nitrate and nitrite) were added in an equimolar dosage of Ca’-corresponding to 1.5 % calcium nitrate by cement weight. An automatic Vicat-apparatus was used to monitor the setting time of the cement pastes. Experiments conducted at 5 OC, 13 OC and 23 OC revealed that calcium nitrate was the most effective set accelerator at lower temperatures and even more effective than calcium chloride at the lowest temperature. The anions of the different calcium salts were also found to influence the setting and the efficiency of each accelerator strongly depended on the cement type.
10.14359/10582
SP200-07
J. J. Brooks and M. A. Megat Johari
The effects of metakaolin and silica fume on the creep and shrinkage of concrete were investigated. Compared with the control concrete, the concrete containing the mineral admixtures had lower early age autogenous shrinkage measured from the time of initial set, but the long-term autogenous shrinkage measured from the age of 24 hours was increased. The total shrinkage (autogenous plus drying shrinkage) measured from 24 hours was reduced. Drying shrinkage was less than for the control concrete. The basic creep of sealed concrete and total creep of drying concrete were significantly reduced due to metakaolin and silica fume particularly at higher replacement levels.
10.14359/10574
SP200-10
H.-Y. Park, C.-Y. Kim, I.-C. Choi, S.-W. Bae, and J.-H. Ryu
This study discusses application of expansive additives for concrete to improve the serviceability of precast box culvert by inducing chemical prestress. For this purpose, both expansive concrete slabs and normal concrete slabs are tested to verify the effect of expansive additives. Then the failure tests of the full-scale precast box culverts are carried out and the critical aspects of the structural behavior are investigated. The result of the material tests shows that the optimal proportion of expansive additives is 13 percent of cement weight, and the properties of expansive concrete are the same as those of normal concrete in that proportion. Both the experimental cracking load and service load of the expansive concrete members are increased in comparison with those of the normal concrete. In addition to the above results, the deformation of expansive concrete member is less than that of normal concrete member, and permanent strain result from cyclic load is decreased. It can be concluded that the use of expansive additives to induce chemical prestress in precast box culvert greatly improves the serviceability.
10.14359/10577
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