Abstract
Concrete exposed to hot climatic conditions is prone to plastic shrinkage after casting within the first few hours due to the water evaporation and restraining conditions of concrete. This cracking is more commonly observed in concrete elements with a large surface area exposed to drying. In this research, plastic shrinkage of 13 self‐compacting concrete samples with different cement paste volumes and various coarse to total aggregate ratios was studied. Test specimens of fresh concrete were subjected to a wind tunnel, which simulated hot dry environmental condition immediately after casting. It can be observed from the test results that the relationship between free plastic shrinkage and the difference between bleeding and evaporation is direct and linear. Finally, a model for plastic shrinkage estimation was suggested by considering the effect of free plastic shrinkage strain, restraining factor, and tensile strain capacity of self‐compacting concrete.
Highlights
Self-compacting concrete (SCC) is an innovative flowable type of concrete that does not need any kind of vibration for compaction. is ability comes from special mix design including superplasticizers and viscosity modifier, and mineral fillers
Some studies focused on SCC properties and plastic shrinkage; none of them evaluated the relationship between bleeding and evaporation in the SCC plastic shrinkage. e purpose of this paper is to investigate the plastic shrinkage properties of self-compacting concrete and develop a new equation for predicting the SCC plastic shrinkage based on the bleeding and evaporation rates
As identi ed by some researchers, when the total evaporation and total bleeding rates are equal, pore water pressure begins to decrease. erefore, the di erence between bleeding and evaporation was selected as the independent variable plotted against free plastic strains to investigate their relationship. e results of 4 out of 13 tests are shown in Figure 8. e results show that the relationship of the difference between bleeding and evaporation and free plastic shrinkage strain is linear. e slope of this line for each mixture depends on the mixture speci cation
Summary
Self-compacting concrete (SCC) is an innovative flowable type of concrete that does not need any kind of vibration for compaction. is ability comes from special mix design including superplasticizers and viscosity modifier, and mineral fillers. Is problem remains a serious concern, in a large surface area, such as ground slabs exposed to hot and/or windy conditions In these cases, the exposed surface area per unit volume of placed concrete is significantly higher than conventional concrete, and the base surface provides a high degree of restraint [2]. In a study on plastic shrinkage cracking of the concrete, Qi et al [4] understood that by increasing the amount of difference between the rate of bleeding and evaporation, the amount of negative pore pressure would increase. E purpose of this paper is to investigate the plastic shrinkage properties of self-compacting concrete and develop a new equation for predicting the SCC plastic shrinkage based on the bleeding and evaporation rates Some studies focused on SCC properties and plastic shrinkage; none of them evaluated the relationship between bleeding and evaporation in the SCC plastic shrinkage. e purpose of this paper is to investigate the plastic shrinkage properties of self-compacting concrete and develop a new equation for predicting the SCC plastic shrinkage based on the bleeding and evaporation rates
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