抗收缩工程水泥基复合材料力学性能研究

摘要/Abstract

摘要： 工程水泥基复合材料(ECC)具有较好的延性和抗拉性能,但成型收缩率较大,容易导致试件成型开裂,严重影响结构的耐久性。在ECC中掺入高性能硫铝酸钙(HCSA)膨胀剂以减小ECC成型收缩率,研究了不同掺量的膨胀剂对ECC收缩率和力学性能的影响。结果表明:膨胀剂掺量为6%~8%(质量分数,下同)时可明显改善ECC的收缩率,膨胀剂掺量过高会使ECC出现膨胀现象;膨胀剂掺量为4%~6%时可明显提高ECC的抗压强度,但对抗拉强度影响较小;膨胀剂掺量为2%~4%时可明显提高ECC的剪切韧性,但对抗剪强度影响较小;膨胀剂掺量为6%~8%时可明显提高ECC的极限弯曲强度。

关键词: 工程水泥基复合材料, 膨胀剂, 收缩率, 力学性能, 峰值应变, 韧性

Abstract: Engineering cementitious composites(ECC)have good ductility and tensile properties. However, the molding shrinkage rate of ECC is large, which leads to cracking in the molding process of specimens and seriously affects the durability of structure. High performance calcium sulpho aluminate(HCSA)expansion agents were added into ECC to reduce the molding shrinkage rate, and the influences of different expansion agents content on the molding shrinkage rate and mechanical properties of ECC were investigated. The results show that the shrinkage rate of ECC can be improved significantly when expansion agents content is 6%~8% (mass fraction same below), but excessive expansion agents will cause expansion of ECC. The compressive strength of ECC significantly increases and there is little change in the tensile strength when expansion agents content is 4%~6%. The shear toughness of ECC significantly increases and there is little change in the shear strength when expansion agents content is 2%~4%. The maximal flexural strength of ECC significantly increases when expansion agents content is 6%~8%.

Key words: engineering cementitious composite, expansion agent, shrinkage rate, mechanical property, peak strain, toughness

中图分类号:

TU528.58

陈宇, 林熙杰, 李长辉, 吴堃, 黄信. 抗收缩工程水泥基复合材料力学性能研究[J]. 硅酸盐通报, 2023, 42(5): 1599-1607.

CHEN Yu, LIN Xijie, LI Changhui, WU Kun, HUANG Xin. Mechanical Performance of Anti-Shrink Engineering Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(5): 1599-1607.

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