早期活化技术在大掺量粉煤灰混凝土中的应用  

Application of Early Activity Technology of High-volume Fly-ash Concrete

作　　者：余丽武[1] 吴志平[1] 

机构地区：[1]南京工程学院建筑工程学院,江苏南京211167

出　　处：《施工技术》2009年第6期70-72,共3页Construction Technology

基　　金：江西省自然科学基金资助项目(0650143)

摘　　要：将硫酸盐+碱复合激发剂加入大掺量的粉煤灰-水泥体系中激发粉煤灰的早期活性,通过净浆宏观力学试验和水化热测定,分析了激发剂对混凝土早期强度和水化热的影响。利用微观测试技术,探讨激发剂在体系中对粉煤灰活性的激发机理,并将其应用于大掺量粉煤灰混凝土建筑工程中。结果表明:掺加激发剂能有效改善大掺量粉煤灰混凝土早期强度低的问题,而且可以在降低水泥水化热的同时,延缓混凝土早期放热峰值的出现,并使混凝土具有良好的抗渗性能。The activator compounded with sulfate and alkalinity is admixed into high-volume fly-ash and cement system to excite the early activity of fly-ash. The effects of activator on early strength of concrete and hydration heat are analyzed by macroscopic tests. Activating mechanism is discussed by microcosmic technology. Then it is also applied on building engineering of high-volume fly-ash eonerete. The results show that the early strength and the permeability of concrete can be improved effectively, and the hydration heat can be reduced and the hot peak value at the early age can be postponed.

关 键 词：混凝土 大掺量粉煤灰混凝土 激发剂 早期活性 活化机理 工程应用 

分 类 号：TU528.21[建筑科学—建筑技术科学]