粉煤灰陶砂次轻混凝土的制备与性能  

Preparation and Performance of Specified Density Concrete of Pottery Sand Made from Fly Ash

作　　者：钱伟[1] 樊传刚[1] 冉松林[1] 李家茂[1] 郭万金[1,2] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]马鞍山市科诺墙体材料制造有限公司,安徽马鞍山243000

出　　处：《安徽工业大学学报（自然科学版）》2012年第2期157-161,共5页Journal of Anhui University of Technology（Natural Science）

基　　金：安徽省科技计划项目(09020303103);安徽省教育厅自然科学重点研究项目(KJ2010A340)

摘　　要：用碎石、粉煤灰陶砂和河砂作为混合集料配制不同细集料组成的次轻混凝土试样,研究它们的力学性能和热学性能。与普通混凝土相比,掺入少量粉煤灰陶砂(陶砂体积分数为25%)的次轻混凝土抗压强度得到提高,表现出较为理想的轻质高强特性。上述现象归功于混合细集料中大小颗粒搭配较好,陶砂的微泵内养护效应以及陶砂表面具有潜在活性物质参加火山灰反应,强化了陶砂与水泥石的界面强度,使掺入体积分数为25%陶砂的次轻混凝土在各龄期具有最高的强度。与普通混凝土相比,当次轻混凝土中陶砂体积分数为25%时,其导热系数可降低42%,即掺入适量陶砂可明显提高混凝土的保温隔热性能。Specified density concrete（SDC） specimens of different fine aggregate composition were prepared with gravel,ordinary sand,and pottery sand made from fly ash.Their mechanical properties and thermal properties were studied.Compared with ordinary aggregate concrete（OAC）,when 25%（volume fraction）ordinary sand was replaced by pottery sand as fine aggregate,the compressive strength of SDC is increased and SDC showed ideal light-weight and high-strength characteristics.The above phenomenon is attributed to reasons that the composite fine aggregate particle size matched well,and micro pump maintenance effect of pottery sand,as well as the pottery surface potentially active substances reacted volcano ash,which reinforced interfacial strength between ceramic sand and cement paste,which made SDC of pottery（volume fraction of 25%） have highest strength in various ages among all as-prepared specimens.Compared with OAC,the thermal conducting coefficient of SDC（volume fraction of 25%） can be decreased by 42%,namely a small amount of replacement of ordinary sand by pottery sand can result in apparent improvement of heat insulation.

关 键 词：粉煤灰陶砂 次轻混凝土 强质比 导热系数 

分 类 号：TU528[建筑科学—建筑技术科学]