Splitting Tensile Strength of Fiber-Reinforced and Biocemented Sand
Splitting Tensile Strength of Fiber-Reinforced and Biocemented Sand
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DOI：
10.1061/(asce)mt.1943-5533.0002841
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发表时间：
2019-09-01
影响因子：
3.2
通讯作者：
Chu, Jian
中科院分区：
文献类型：
--
作者：
Choi, Sun-Gyu;Hoang, Tung;Chu, Jian
本技术说明研究了用聚醋酸乙烯酯（PVA）纤维处理的天然砂的劈裂抗拉强度特性，并使用微生物诱导方解石沉淀（MICP）工艺进行生物胶结。将渥太华20-30砂与PVA纤维以五种不同的纤维比例（0.0%、0.2%、0.4%、0.6%和0.8%重量）混合，然后使用产生尿素酶的细菌加上尿素和氯化钙（CaCl 2）溶液进行稳定。测定了处理后砂样的劈裂抗拉强度。结果表明，随着碳酸钙含量的增加和纤维掺量的增加，复合材料的劈裂抗拉强度和劈裂割线弹性模量均增大。PVA纤维与MICP复合处理也能提高复合材料的破坏应变和破坏后的劈裂抗拉强度。
This technical note examines the splitting tensile strength properties of natural sand treated with polyvinyl acetate (PVA) fiber in combination with biocementation using the microbially induced calcite precipitation (MICP) process. Ottawa 20-30 sand was mixed with PVA fiber at five different fiber ratios (0.0%, 0.2%, 0.4%, 0.6%, and 0.8% by weight) and then stabilized using urease-producing bacteria plus urea and calcium chloride (CaCl2) solutions. Splitting tensile strength was determined for the treated sand samples. The results showed that the splitting tensile strength and splitting secant elastic modulus increased with increasing in either calcium carbonate content or fiber ratio. The use of PVA fibers together with MICP treatment could also increase the failure strain and the postfailure splitting tensile strength.