Study On Evaluating Early-age Cracking Resistant Based On The Test Of Temperature-stress Testing Machine

Bases on the hydration of the concrete, the shrinkage or the expand comes into being at early age. If the shrinkage (or the expand) was restricted, internal stresses would be occurred in the concrete. And the concrete would crack at the time of the internal stress bigger than the tensile strength. This kind of non-structural crack does great harm for the durability of concrete. Factors which lead to the crack of concrete are various and most of them are act or react on each other. So in order to get the most appropriate concrete which has batter cracking resistance, The testing method which can quantify the property of concrete and the aggregative indicator which can evaluate the cracking resistance of concrete are important and necessary objects to study.Based on the study of the temperature-stress testing machine allover the world, this paper improved the equipment to make the results tested by TSTM more accurate. Teams of test which study the individual performance and four groups of integrate concrete cracking test have been put up, to improved temperature, displacement and stress testing and performance control of the temperature stress testing machine. Success in achieving the water cycle control temperature of concrete and concrete specimens can better simulate actual engineering course of the temperature of different parts.In order to verify the reasonableness of the model, the paper compared finite element results under adiabatic temperature field with the classic Conclusion: compared the adiabatic temperature rise of the experiment with the model adiabatic temperature data; analysis the development of stress in different place of temperature-stress testing machine, which can explain the stress concentration at the fixed collet.Finally, the existing shortages in this paper were indicated and the research direction in the future was put forward. The content and conclusions of this paper may provide a reference for evaluative system of cracking resistance of early age concrete, also for the standardization of the test of temperature-stress testing machine.