碳化龄期对水泥砂浆动态力学特性影响试验研究

doi:10.11896/cldb.20040049

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Abstract In order to study the effect of carbonation age on concrete dynamic mechanical properties, carbonization simulation of circumferential direction on cement mortar specimens were carried out by carbonization test box, the age of carbonization is 0 d, 3 d, 7 d, 14 d and 28 d respectively. And with diameter of 50 mm SHPB test device, the shock compression test was did. The relationships of dynamic compressive strength, dynamic elastic modulus, dynamic peak strain and fragmentation degree with the age of carbonization are obtained. The results show that the dynamic compressive strength and dynamic elastic modulus of mortar specimens increase with the growth of the carbonation age due to the carbo-nation layer formed by the CaCO₃ crystals on the surface of cement mortar. From 0 d to 28 d, the dynamic compressive strength increases by 2.06 times and the dynamic elastic modulus increases by 65.24%. With the increase of carbonization depth, the restraint effect of carbonation la-yer gradually appears, and the specimens with carbonation age of 14 d and 28 d show a certain stress enhancement effect. Carbide layer brittle failure, leading to the constraint function fails, the peak strain of the specimen decrease with the increase of carbonization age, reduce the deformation capacity of the specimens, specimen failure pattern with the growth of the age gradually become large, carbide after impact specimen is greater than 7 mm pieces quality than by carbonization age 0 d increased from 47.65% to 94.90% of carbonization age 28 d.

Key words： SHPB carbonization cement mortar dynamic mechanical characteristics

Published: 01 July 2021

CLC number:

TU528

Fund:This work was financially supported by Anhui Natural Science Foundation (2008085ME163), Key Research and Development Program of Anhui Province (201904a07020081), Natural Science Key Project of Anhui Province University (KJ2018A0074).

About author:: Haibo Wang, doctor of engineering and postdoc, is currently an associate professor and master's supervisor at Anhui University of Science and Technology. He is mainly engaged in scientific research and teaching in underground engineering, blasting engineering and impact dynamics. He has won 8 provincial and ministerial scientific and technological achievements awards, 10 invention patents and utility model patents, 1 textbook and more than 30 papers.

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	WANG Haibo
	XU Cheng
	WANG Mengxiang
	XU Ying

Cite this article:

WANG Haibo,XU Cheng,WANG Mengxiang, et al. Experimental Study on Effect of Carbonization Age on Dynamic Mechanical Properties of Cement Mortar[J]. Materials Reports, 2021, 35(12): 12087-12091.

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http://www.mater-rep.com/EN/10.11896/cldb.20040049 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12087

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