预拌混凝土的缓凝问题及其预防措施  

The Retarded Setting of Ready-mixed Concrete and Precautionary Measures

作　　者：成立[1] 王善拔 余其俊[3] 赵三银[3] 范庆新[4] 

机构地区：[1]荆门职业技术学院化工系,湖北荆门448000 [2]广州市建筑材料工业研究所,广东广州510640 [3]华南理工大学特种功能材料及制备技术教育部重点实验室,广东广州510640 [4]广东工业大学,广东广州510030

出　　处：《济南大学学报（自然科学版）》2005年第1期12-16,共5页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金资助项目 (5 0 3 72 0 2 1)

摘　　要：从水泥与混凝土的凝结机理以及缓凝剂、缓凝型减水剂对水泥与混凝土凝结的影响 ,分析探讨了预拌混凝土产生缓凝、超缓凝的原因及其预防措施 ,认为导致预拌混凝土产生缓凝或超缓凝的主要原因是 :(1)水泥本身的凝结时间过长 ;(2 )缓凝剂或缓凝型减水剂掺量过大。因此 ,在预拌混凝土生产过程中应选择凝结时间合适的水泥、准确把握与控制缓凝剂或缓凝型减水剂的掺量。According to the setting mechanisms of cement and the influence of set retarder or set-retarding and water-reducing agent on the setting,we analyzed the reasons for the retarded set or super retarded-set of ready-mixed concrete and the measures to offset.The results show that the reasons are mainly due to the retarded set of cement used or the excessive addition of set retarder or set-retarding and water-reducing agent.Attentions should be therefore paid to the application of cements with appropriate setting time and the accurate addition of set retarder or set-retarding and water-reducing agent in the production of ready-mixed concrete.

关 键 词：预拌混凝土 缓凝现象 防止措施 

分 类 号：TU528[建筑科学—建筑技术科学]