摘要
为提高地聚合物固化淤泥的工作性能,以多种工业废渣和激发剂制备单组分地聚合物胶凝材料,通过无侧限抗压强度试验和扫描电镜测试的手段,探讨了固化剂掺量、激发剂种类和养护龄期对单组分地聚合物固化淤泥强度及微观结构的影响,并提出了地聚合物固化淤泥强度经验模型。结果表明:固化淤泥土强度随养护龄期和固化剂掺量增加而增加,固化剂掺量拐点和强度增长系数与激发剂种类有关;硫酸盐激发效果优于碱激发剂,性能优劣依次为硫酸铝>硫酸钠>硅酸钠>氢氧化钠;C-A-S-H凝胶的生成能促进固化土微观结构发展,抗压强度得到提升;硫酸盐激发体系生成的钙矾石填充粒间孔隙,进一步改善了固化体微观结构,抗压强度大幅提高;经验模型参数与激发剂种类密切相关,预测效果与实测数据较为吻合。
To improve the working performance of geopolymer solidified sludge, a single-component geopolymer as cementitious material was prepared by using various industrial slag and activators.The influence of hardener amount, activator type and curing age on the strength and micro-structure of single-component geopolymer solidified sludge was investigated by unconfined compressive strength and scanning electron microscope tests.And an empirical strength prediction model for the geopolymer solidified sludge was proposed.The results demonstrated that the compressive strength of solidified soil increased with the increasing curing age and dosage, and the inflection point of hardener dosage and strength growth coefficient of solidified soil were closely related to the activator type.The activation performance of sulfates was better than alkaline activators, and the sequence of activators was presented as follows: aluminum sulfate > sodium sulfate > sodium silicate > sodium hydroxide.The C-A-S-H gels promote the micro-structure development of solidified soil and enhance its strength behavior.The ettringite formed in sulfate-activated byproduct system can fill the pore space between particles, furthermore improving the micro-structure and compressive strength of solidified matrix.The parameters in the empirical strength prediction model are closely related to the activator types, and the prediction results are in good agreement with the measured data.
作者
唐孝林
蒲隆进
王子帅
王彦吉
TANG Xiaolin;PU Longjin;WANG Zishuai;WANG Yanji(Sinohydro Engineering Bureau 7 Co.Ltd.,Chengdu 610213,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China)
出处
《人民长江》
北大核心
2022年第10期169-174,204,共7页
Yangtze River
关键词
单组分地聚合物
固化淤泥
工业废渣
激发剂
微观结构
强度经验模型
single-component geopolymer
solidified sludge
industrial slag
activator
microstructure
empirical strength model
