Evaluation of the bonding properties between low-value plastic fibers treated with microbially-induced calcium carbonate precipitation and cement mortar
Evaluation of the bonding properties between low-value plastic fibers treated with microbially-induced calcium carbonate precipitation and cement mortar
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DOI：
10.1016/j.conbuildmat.2022.129331
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发表时间：
2022-10-25
影响因子：
7.4
通讯作者：
Heveran, Chelsea
中科院分区：
文献类型：
--
作者：
Espinal, Michael;Kane, Seth;Heveran, Chelsea
塑料纤维增强胶凝材料提供了增加塑料废物的可重复使用性和创造低二氧化碳胶凝复合材料的潜力。然而，许多塑料类型与普通硅酸盐水泥（OPC）的粘结性能在很大程度上是未知的。这项工作采用单纤维拉拔（SFPO）测试来量化嵌入OPC砂浆中的聚氯乙烯、低密度聚乙烯、聚丙烯、聚苯乙烯和丙烯腈-丁二烯-苯乙烯的界面粘合性能。比较了微生物诱导碳酸钙沉淀（MICP）处理和未处理两种纤维的界面结合性能。SFPO试验表明，塑料类型对粘接性能影响较大。具体来说，由水接触角测量得出的纤维表面能是粘结强度的驱动因素。ABS具有最高的表面能，并且在所有类型的塑料中显示出最强的结合。然而，MICP处理纤维并没有增加任何塑料的界面结合强度。MICP在纤维表面覆盖的厚而不一致的生物矿物可能是由于阻止了粘合强度的增加。这些结果通过比较一系列典型的低价值、不可回收塑料类型的粘结性能，有助于塑料增强砂浆的设计和应用。
Plastic fiber reinforced cementitious materials offer the potential to increase the reusability of plastic waste and create lower-CO2 cementitious composites. However, the bonding properties of many plastic types with ordinary Portland cement (OPC) are largely unknown. This work employs single fiber pullout (SFPO) tests to quantify the interfacial bonding properties of polyvinyl chloride, low-density polyethylene, polypropylene, polystyrene, and acrylonitrile butadiene styrene embedded in OPC mortar. The interfacial bonding properties were compared for fibers either treated with microbially-induced calcium carbonate precipitation (MICP) or left untreated. SFPO tests revealed that plastic type had a large influence over bonding properties. Specifically, the fiber surface energy, as estimated from water contact angle measurements, was found to be the driving factor of bond strength. ABS had the highest surface energy and demonstrated the strongest bonding out of all plastic types studied. However, MICP treatment of fibers did not increase the interfacial bond strength for any of the plastics studied. The thick and inconsistent coverage of biomineral over the fiber surface from MICP is likely attributed to preventing an increase in bond strength. These results contribute to the design and application of plastic -reinforced mortars by comparing bonding properties for a range of typically low-value, unrecycled plastic types.