微波加热对地聚物砂浆力学强度的影响  

Influence of Microwave Heating on Mechanical Strength of Geopolymer-Based Mortar

作　　者：佟钰[1] 夏枫[1] 张婷[1] 王利坤[1] 谢巧玲[1] 

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2015年第2期313-319,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51278312);国家十二五科技支撑重点项目(2011BAJ10B04)

摘　　要：目的探讨微波加热工艺在混凝土快速养护工艺中的应用效果,探寻适用于地聚物混凝土的快速养护方法及其可靠工艺参数.方法采用水玻璃、粉煤灰、石英砂、水为主要原料配制地聚物砂浆,成型后坯体置于微波装置中加热固化处理,分析表征试样的微观结构和力学强度.结果微波加热条件下,试样的力学强度增长迅速,10 min左右微波处理即可达到甚至超过标准养护28 d的强度,但长时间微波加热导致试样力学强度降低甚至结构开裂;试样最大强度随微波功率的提高而有所增大,相应微波加热时间则有所缩短;在自然干燥状态下,微波加热后地聚物砂浆试样可长期保持强度稳定.结论适当管理的微波加热工艺可作为一种简便的混凝土快速养护方法,适用于地聚物混凝土等结构表面的快速硬化工程等,但过度地微波处理如功率过大或处理时间过长,对砂浆强度不利.The aim of this paper is to explore application effects of microwave heating on curing of concrete and to find a feasible method and curing conditions for fast development of geopolymer- based concrete. Employing water glass, fly ash, water and quartz sand as main raw materials, cylindrical specimens of geopolymer mortar were prepared and formed. After microwave heating and strength development of specimens, their microscopic structures and mechanical properties were analyzed. It is found that in the condition of microwave heating, strength developments of specimens are fast. The compressive strengths after a dozen of minutes reach or even exceed that cured in standard conditions for 28 days. But with a long time of microwave heating, the mechanical strength of specimens decrease and even make structures crack. Furthermore, the maximum strength increases with increase of the microwave power. Under the natural dry state, strengths of specimens heated by microwave can be stable for a long time. Conclusion is that the microwave heating tech- nology can be used as a feasible method for accelerated curing of concrete, especially suitable for the surface hardening of geopolymer-based concrete. But too large microwave power or too long heating time in the treatment procedure is not suitable for the mortar strength.

关 键 词：微波加热 地聚物 砂浆 强度 

分 类 号：TU502[建筑科学—建筑技术科学] TQ172[化学工程—水泥工业]