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Research on Influence of Admixture to the Constitutive Equation of Plastic Shrinkage Cracking of Cement Mortar

MA Yiping;TAN Chang;YANG Xiaojie;WANG Yang;LI Zhi;Key Laboratory of Advanced Civil Engineering Materials of Education,Tongji University;  
The influence of admixture to plastic shrinkage cracking was studied.The results show that the content of air-entraining agent and anti-cracking index are proportional when the content of air-entraining agent is lower than 200×10-6.The cement mortar cracks when air-entraining agent content is up to 250×10-6.Early strength accelerator counts against reducing the plastic shrinkage cracking of cement mortar,water-reducing agent,water-retaining agent and retarder can reduce the plastic shrinkage cracking of cement mortar.The constitutive relations between the content of air-entraining agent,content of early strength accelerator,content of water-reducing agent,content of water-retain agent,content of retarder and its anti-cracking index have been built.
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