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《Acta Materiae Compositae Sinica》 2018-06
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Prediction of micro creep behavior of hardened cement paste based on the isotache model of clays

WEI Ya;LIANG Siming;GAO Xiang;Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Department of Civil Engineering,Tsinghua University;  
Cement-based material is a strain-rate-sensitivity material,understanding of the strain rate effect on the mechanical properties and deformation of cement-based materials fully can ensure safe design of concrete structures with enhanced performance.The micro creep of hardened cement pastes under different strain rates were investigated by performing continuous stiffness measurement.The(water to cement)w/c ratios of hardened cement pastes were 0.3,0.4,and 0.5.The maximum indentation depth during the CSM was set as 30μm and the applied strain rates were 0.01 s-1,0.05 s-1,0.1 s-1,and 0.5 s-1.The results show that a unique hvp-P-6)εrelationship is found for hardened cement paste under the strain rates ranging between 0.01 s-1 and 0.5 s-1 at microscale.This is analogous to the uniqueεvp-σ-6)εrelationship for clays.The hvp-P-6)εrelationship can be simply described by two sets of curves:the PN/PN0.05-6)εcurve and the normalized hvp-P/(PN/PN0.05)curve.These two curves can be used to predict the hvp-Pcurves of cement pastes under any constant strain rate during the loading stage.This finding preliminary confirms the applicability of the isotache approach to characterize the time-dependent deformation of cement pastes at microscale.
【Fund】: 国家自然科学基金(51578316;51778331)
【CateGory Index】: TQ172.1
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