A COMPARISION BETWEEN PLASTIC SHRINKAGE OF CONCRETE CONTAINING SILICA FUME AND THE NORMAL CONCRETE

Published on Dec 15, 2007in International Journal of Civil Engineering2.081
P Ghodousi1
Estimated H-index: 1
,
A M Raeis Ghasemi1
Estimated H-index: 1
,
T Parhizkar1
Estimated H-index: 1
Sources
Abstract
Plastic shrinkage is one of the most important parameter which must be considered in hot weather concreting. If plastic shrinkage is not prevented, cracking will be significant, especialy if silica fume is used in the mix. In this paper, the effect of silica fume in bleeding and evaporation was investigated in laboratory. The results showed that in restrained shrinkage, beside relative humidity, temperature and wind velocity, sun rediation also is very important factor in evaporation rate. It is found that under solar radition condition, the evaporation was much larger than the estimated value in ACI 305 Nomogram. The rate of evaporaion under solar radiation was about two folds of evaporation rate under shade condition. The results showed that in terms of crack initiation time, crack width and total cracking area, concrete containing silica fume is more severe than concrete with no silica fume. Reduction of water cement ratio in concrete with silica fume makes the concrete more sensitive in cracking. The results of this project also showed that the severity of the cracking is not related only to rate of bleeding but all environmental factors including like sun radiation or shading and also mix compositions have important roles.
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#1Yutian Shao (FIU: Florida International University)H-Index: 5
#2Amir Mirmiran (FIU: Florida International University)H-Index: 33
Five different configurations of carbon fiber-reinforced polymer (FRP) grids were tested for the control of plastic shrinkage cracking of concrete using carbon FRP rods with two different spacings, two configurations of conventional steel wire meshes, and fiber reinforced concrete with two different fiber volume fractions. The experimental program followed the standard acceptance criteria test method for concrete with synthetic fibers. Test results showed that carbon FRP grids meet or exceed the...
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#1Christopher K.Y. Leung (HKUST: Hong Kong University of Science and Technology)H-Index: 52
#2Augustus Y.F. Lee (HKUST: Hong Kong University of Science and Technology)H-Index: 3
Last. Raymond Lai (HKUST: Hong Kong University of Science and Technology)H-Index: 3
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Plain shotcrete and fiber-reinforced shotcrete (FRS) are commonly employed to produce layers or linings with large surface/volume ratios. Restrained shrinkage cracking is hence an important concern from both structural and durability aspects. In this investigation, a new testing procedure is adopted to study the shrinkage cracking behavior for plain shotcrete and four different types of FRS (polypropylene, steel, polyvinylalcohol, and hybrid). To introduce shrinkage restraint, specimens cut from...
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#1G.S. Hasanain (KAU: King Abdulaziz University)H-Index: 1
#2T.A. Khallaf (KAU: King Abdulaziz University)H-Index: 1
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The paper reports a study conducted in the hot weather of Jeddah, Saudi Arabia, on a number of specimens, with surface area of 0.1m2, prepared by using the concrete produced for a construction project. This study indicates that besides weather components, the time of casting, difference of concrete and air temperatures and moisture condition of the concrete surface influence the rate of evaporation of water from freshly placed concrete surfaces. For the specimens cast in the morning, noon or ear...
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#1H. Famili (IUST: Iran University of Science and Technology)H-Index: 1
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