废弃混凝土-水泥土强度特性及固化机理研究  

Study on the Strength Characteristics and Solidification Mechanism of Waste Concrete and Cemen

作　　者：栗霞 沈兴刚 杜俊[1] 杨叶秀[1] 李丽蓉[1] LI Xia, SHEN Xing-gang, DU Jun,YANG Ye-xiu, LI Li-rong(College of City and Countryside Construction and Engineering Management, Kunming University, Kunming 650214, Chin)

机构地区：[1]昆明学院城乡建设与工程管理学院,昆明650214

出　　处：《工程建设与设计》2018年第6期8-11,24,共5页Construction & Design for Engineering

基　　金：昆明学院科学研究项目(XJL15006)

摘　　要：将拆除城市旧建筑物和构筑物时产生的废弃混凝土掺入水泥土中,研究废弃混凝土-水泥土无侧限抗压强度的影响因素及其固化机理。采用正交试验方法,进行水泥土配合比设计和室内无侧限抗压强度试验。试验研究表明:影响废弃混凝土-水泥土无侧限抗压强度的主次因素依次是龄期、水泥掺量、废弃混凝土掺量;在水泥土中掺入15%~20%废弃混凝土可以有效提高水泥土的无侧限抗压强度。由废弃混凝土-水泥土固化机理分析得到:水泥土强度增长的主要原因是水泥的水解和水化反应;水泥与土颗粒之间的离子交换和团粒化作用进一步提高了水泥土的强度;废弃混凝土对水泥土强度增长的影响主要是填充效应和水化效应。The factors affecting the unconfined compressive strength of waste concrete cement soil and the curing mechanism were studied by incorporating waste concrete produced in urban old buildings and structures. Orthogonal test method was used to design the cement soil mix and the indoor unconfined compressive strength test. The experimental results show that the primary and secondary factors affecting the unconfined compressive strength of waste concrete are age, cement content and waste concrete content. Addition of 15% ~ 20% of waste concrete in cement soil can effectively improve the cement unconfined compressive strength of soil. The solidification mechanism of waste concrete soil cement was analyzed： the hydrolysis and hydration reaction of cement is the main reason for the increase of waste concrete soil cement strength; the interaction between cement and soil particles in ion exchange and granulation, hard condensation reaction promoted and the strength of the soil cement and the stability of water; the effect of waste concrete on the increasing strength of soil cement is the filling effect and hydration effect.

关 键 词：废弃混凝土 水泥土 正交试验 无侧限抗压强度 固化机理分析 

分 类 号：TU528.09[建筑科学—建筑技术科学]