表面亲水改性氧化石墨烯/钼尾矿复合水泥材料制备

摘要

尾矿严重影响周围生态环境,利用尾矿制备水泥材料是一种绿色清洁的方法.然而,利用尾矿制备的水泥基复合材料,普遍力学性能较差.本论文旨在制备表面亲水改性氧化石墨烯,引入水泥基体改善其力学性能,研究其对水泥水化产物微观结构的影响.研究结果表明加入氧化石墨烯能够有效改善水泥材料的力学性能,加入0.05%氧化石墨烯,养护28d,抗折强度增大40%,抗压强度增加36%.这是因为氧化石墨烯对于水泥水化产物的形成具有模板效应和诱导效应,形成这种密实堆积的结构有利于改善水泥强度.%The tailings seriously affect the surrounding ecological environment. As we known,the use of tail-ings to prepare cement materials is a green cleaning method. However,the cement based composite made from tailings has the main problems such as low flexural strength and poor toughness at present. Here we prepared sur-face hydrophilic modified graphene oxide,and then introduced to the the cement matrix to improve its mechanical properties. The results showed that graphene oxide can efficiently improve the mechanical properties of molybde-num tailings cement composite. Addition of 0.05% graphene oxide,and then curing 28 days,the flexural strength and compressive strength increased by 40% and 36%,respectively. This can be attributed to the template effect and induction effect on the formation of cement hydration products,which leaded the cement matrix doped with graphene oxide to form lamellar structure or to aggregate,forming this dense packing structure to improve the strength of cement.