羟基化石墨烯对水泥基渗透结晶型防水材料力学性能的影响

Effect of Hydroxylated Graphene on Mechanical Properties of Cement-Based Permeable Crystalline Waterproof Materials

使用羟基化石墨烯(HO-G)改性水泥基渗透结晶型防水材料(CCCW),不仅能够提升结构整体的力学性能,还能在一定程度上降低成本。本文研究了木质素磺酸钠(SL)对HO-G分散能力的影响和HO-G对CCCW力学性能的影响。结果表明:当m(HO-G)∶m(SL)=1∶4时,HO-G在Ca(OH)2中的分散性最佳;当HO-G掺量为0.03%(质量分数)时,HO-G砂浆试件的3、28 d抗压强度较基准试件分别提升了37.69%、33.05%,3、28 d抗折强度分别提升了17.31%、31.52%,HO-G改性后的CCCW涂层试件较单独掺加CCCW涂层试件的抗渗压力比提高了127个百分点;SL能够促进HO-G在水泥基材料中的分散,HO-G在砂浆基质中发挥了填充作用和模板作用,增强了水化产物的密实度,进而提高了材料的力学性能。

The use of hydroxylated graphene(HO-G)modified cement-based permeable crystalline waterproof materials(CCCW)not only improves the mechanical properties of whole structure,but also reduces the cost to a certain extent.The effect of sodium lignosulfonate(SL)on the dispersion performance of HO-G was studied,and the influence of HO-G on the mechanical properties of CCCW was studied.The results show that when the mass ratio of HO-G to SL is 1∶4,HO-G has the best dispersion performance in Ca(OH)2.When HO-G content is 0.03%(mass fraction),compared with benchmark specimen,the 3 and 28 d compressive strength of HO-G mortar specimen increases by 37.69%and 33.05%,respectively and the 3 and 28 d flexural strength increases by 17.31%and 31.52%,respectively.The impermeability pressure ratio of CCCW coating specimens modified by HO-G is 127 percentage points higher than that of CCCW coating specimens alone.SL promotes the dispersion of HO-G in cement-based materials,and HO-G plays a filling role and template role in mortar matrix,which enhances the compactness of hydration products,and then improves the mechanical properties of material.