橡胶类型与替代率对机制砂砂浆基本性能的影响

摘要/Abstract

摘要： 为减小废弃橡胶填埋对环境的不利影响,将粉碎后的橡胶作为细骨料掺入砂浆,并进行了不同替代率的橡胶颗粒(NR20)与橡胶纤维(NRS)对机制砂砂浆工作性能、力学性能及抗冲击性能的影响试验。结果表明:随着橡胶替代率增加,橡胶颗粒砂浆的稠度逐渐增加,分层度逐渐减小,而橡胶纤维砂浆的稠度减小后基本保持不变,分层度逐渐增大;另外,两种类型橡胶砂浆的抗压、抗折强度均随橡胶替代率的增加而减小,且橡胶纤维砂浆的抗压、抗折强度较高。掺入橡胶后,砂浆的冲击破坏形态由单条裂缝贯穿破坏转变为多条裂缝发散破坏。砂浆内掺入橡胶越多,发生冲击破坏所需的冲击能耗越高,且橡胶纤维砂浆的冲击能耗提升幅度更大。

关键词: 机制砂砂浆, 橡胶, 工作性能, 力学性能, 破坏形态, 冲击能耗

Abstract: In order to reduce the adverse effects of waste rubber landfill on the environment, in this paper, crushed rubber as fine aggregate was mixed into mortar and experiments were conducted on the effects of different substitution ratios of rubber particles (NR20) and rubber fibers (NRS) on the workability, mechanical properties, and impact resistance of manufactured sand mortar. The results show that as the rubber substitution ratio increases, the consistency of rubber particle mortar gradually increases, and the delamination degree gradually decreases, while the consistency of rubber fiber mortar decreases first and then remains basically unchanged, and the delamination degree gradually increases. In addition, the compressive and flexural strength of rubber mortar decrease with the increase of rubber substitution ratio, and the compressive and flexural strength of rubber fiber mortar is higher than that of rubber particle mortar. Rubber changes the impact failure mode of mortar from single crack to multiple crack. The more rubber is added to the mortar, the higher the impact energy consumption for impact failure required is, and the impact energy consumption of rubber fiber mortar is higher than that of rubber particle mortar.

Key words: manufactured sand mortar, rubber, workability, mechanical property, failure mode, impact energy consumption

中图分类号:

TU528.1

延永东, 谭磊, 陆春华, 袁思奇, 王鑫. 橡胶类型与替代率对机制砂砂浆基本性能的影响[J]. 硅酸盐通报, 2024, 43(12): 4452-4460.

YAN Yongdong, TAN Lei, LU Chunhua, YUAN Siqi, WANG Xin. Effects of Rubber Form and Substitution Ratio on Basic Properties of Manufactured Sand Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(12): 4452-4460.

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