氧化石墨烯水泥基材料的力学性能数值分析

Analysis of mechanical properties of graphene oxide cement

针对氧化石墨水泥基复合料易导致水泥净浆流动性下降的问题,以氧化石墨烯掺入量为试验变量掺入到水泥基材中,分析不同氧化石墨烯掺入量对水泥净浆流动性和硬化水泥微观结构和力学性能的影响作用。研究结果表明:随着氧化石墨烯掺量的增加,水泥净浆流动度逐渐下降,硬化水泥石强度表现出一个先增加后下降的变化趋势,氧化石墨烯掺量在0.01%时的强度达到最大值;不同水化龄期内,氧化石墨烯掺量在0.03%以下时,能够有效调控水泥水化晶体产物的有序生长;掺入量提高到0.05%以上后仅部分能够对硬化水泥石起到生长调节作用。针对氧化石墨烯掺入导致水泥净浆流动度下降,通过掺入一定比例的PCs保证流动度在200 mm以上,保证水泥基的良好流动性。

In view of the problem that the fluidity of cement paste decreases easily caused by graphite oxide cement compound,the content of graphene oxide is used as the experimental variable to add into the cement base material.The effects of different content of graphene oxide on the fluidity of cement paste and the microstructure and mechanical properties of hardened cement were analyzed.The results show that the fluidity of cement paste decreases with the increase of graphene oxide content,and the strength of hardened cement paste increases first and then decreases.The strength of graphene oxide reached the maximum when the content of graphene oxide was 0.01.When the content of graphene oxide is less than 0.03%in different hydration period,the energy can be obtained when the content of graphene oxide is less than 0.03%.Enough to control the ordered growth of cement hydration crystal product,only a part of the hardened cement stone can be regulated by adding more than 0.05%.The fluidity of cement paste was decreased due to the addition of graphene oxide,and the fluidity of cement was ensured by adding a certain proportion of PCs to ensure the fluidity of cement.