纤维和烧结粉煤灰对地聚物力学性能的影响

Effect of Fiber/hybrid Fiber/sintered Fly Ash on Mechanical Properties of Geopolymer

探究短切玻璃纤维、聚丙烯纤维、钩型铁丝、混合纤维、烧结粉煤灰对铬渣-粉煤灰基地质聚合物性能的影响,利用扫描电镜(SEM)对其结构进行分析。实验结果表明玻璃纤维易于被腐蚀;钩型铁丝难与基体贴合;混合纤维、烧结粉煤灰呈现前期强度低,后期强度回升大;聚丙烯纤维的增韧效果最佳,在掺量为1.2%时,7 d、28 d抗折、抗压强度分别为4.5 MPa、16.8 MPa、8.7 MPa、21.1 MPa,与未添加纤维相比,分别提高了181%、222%、41.77%、25.5%,且Cr^(6+)浸出浓度为0.9 mg/L;其强化力学性能排序为聚丙烯纤维>烧结粉煤灰>混合纤维>玻璃纤维>钩型铁丝。最佳试样进行酸雨模拟实验,抗压强度缩减了27.4%,证明该配比能抵御短时间酸雨侵蚀。该研究成果将为工业废渣资源化利用,提供技术参考,促进工业废渣的处理及应用。

The effects of chopped glass fiber,polypropylene fiber,hooked iron wire,mixed fiber and sintered fly ash on the properties of chromium slag-fly ash based polymer were investigated.The experimental results show that glass fiber is easy to be corroded.Hook wire is difficult to bond with base.The strength of mixed fiber and sintered fly ash is low in the early stage,but the strength in the later stage rises greatly.The toughening effect of polypropylene fiber is the best.When the content of polypropylene fiber is 1.2%,the flexural strength and compressive strength are 4.5 MPa,16.8 MPa,8.7 MPa and 21.1 MPa at 7 d and 28 d,respectively,which are increased by 181%,222%,41.77%and 25.5%compared with those without fiber,and the leaching concentration of Cr^(6+) is 0.The reinforced mechanical properties of polypropylene is fiber>sintered fly ash>mixed fiber>glass fiber>hooked iron wire.The research results will provide technical reference for resource utilization of industrial waste residue,and promote the treatment and application of industrial waste residue.