盐-干湿循环作用下低温养护纤维水泥土的力学性能试验研究
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TU411.3

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国家自然科学基金(52008185);吉林省教育厅“十三五”科学技术研究规划项目(JJKH20200283KJ)


Experimental study on mechanical properties of fiber-reinforced cemented soil with the low temperature curing condition subjected to effect of salt and drying-wetting cycles
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    摘要:

    为探明玄武岩纤维水泥土在盐溶液(Na2SO4)和干湿循环耦合作用下的力学特性,将玄武岩纤维按一定比例掺入水泥土中,试块分批分次放入不同浓度的盐溶液中浸泡,而后放入烘干箱中烘干,如此实现若干次干湿循环,并基于无侧限抗压强度试验,研究低温和常温养护条件下纤维水泥土的强度变化规律,在此基础上,探讨盐溶液浓度和干湿循环次数对试块表面质量、抗压强度及应力-应变关系的影响。结果表明:低温养护对强度的发展起到抑制作用,而玄武岩纤维依然能够改善水泥土的力学性能;纤维的介入,可有效提高水泥土抵抗盐溶液及干湿循环的共同作用,能够延缓水泥土表面裂纹的发展,降低强度损失率,提高残余强度,试验曲线存在峰值。

    Abstract:

    In order to investigate the mechanical properties of the basalt fiber-reinforced cemented soil subjected to the action of salt (Na2SO4) and drying-wetting cycles, a certain amount of fiber was added into the cemented soil. The specimens were soaked in different concentrations of salt solution, and then placed into an oven for drying subjected to a series of drying-wetting cycles. Based on the unconfined compressive strength tests, the characteristics of compressive strength under the curing condition of low and normal temperature were studied. And then, the effect of salt solution concentration and number of drying-wetting cycles on surface quality, compressive strength and stress-strain relationship of specimens were discussed. The results show that the curing condition of low temperature prevents the development of strength of cemented soil, however, basalt fiber can still improve the mechanical properties of cemented soil. The inclusion of fiber can effectively improve the resistance of cemented soil to the combined effect of salt solution and drying-wetting cycles, postpone the propagation of cracks on the surface of cemented soil, reduce the strength loss rate, and improve the residual strength. Results also indicate that there is an obvious peak in the testing curve.

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徐丽娜,邓皓允,牛雷,郑俊杰,钱永梅.盐-干湿循环作用下低温养护纤维水泥土的力学性能试验研究[J].土木与环境工程学报(中英文),2022,44(1):10-19. XU Lina, DENG Haoyun, NIU Lei, ZHENG Junjie, QIAN Yongmei. Experimental study on mechanical properties of fiber-reinforced cemented soil with the low temperature curing condition subjected to effect of salt and drying-wetting cycles[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2022,44(1):10-19.10.11835/j. issn.2096-6717.2021.098

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  • 收稿日期:2021-03-12
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  • 在线发布日期: 2021-11-25
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