Experimental Study on Stress-Strain Constitutive Relations of Cement Asphalt Mortar
ZHANG Miao1,2, TIAN Qing1,2,*, QU Mengjiao1,2, QI Shuai1,2, YAO Tianshuai1,2, XU Gelong1,2, DENG Dehua3
1 Kaifeng Research Center for Engineering Repair and Material Recycle, Henan University, Kaifeng 475004,Henan, China 2 State Key Laboratory of Green Building Materials, Beijing 100024, China 3 School of Civil Engineering, Central South University, Changsha 410075, China
Abstract: In this work, the uniaxial compression test of cement asphalt (CA) mortar with different mix proportions were examined by a universal material testing machine, the constitutive behavior of stress-strain were discussed. The effect of composition and structure on the constitutive equation parameters were analysed, and a quantitative relationship between the two was established. Results show that the calculated curve of the segmented constitutive equation agrees well with the test curve, the segmented equation can effectively reflect the stress-strain characteristics of CA mortar under uniaxial compression. The effects of mA/mC and mW/mC on the microstructure of CA mortar are different, constitutive equation parameters vary with mA/mC to a greater extent than with mW/mC. According to the conversion relation between constitutive equation parameters and mA/mC, mW/mC, moreover, in reference to the calculation formula for compressive strength and peak strain of CA mortar, the full stress-strain curve of a CA mortar with known mix ratio can be estimated effectively.
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2022, Vol. 36 
