高性能轻骨料与普通轻骨料的性能比较  

Comparison of Properties of High Performance lightweight Aggregate and Normal Lightweight Aggregate

作　　者：郭玉顺[1] 丁建彤[1] 木村薰 李民伟 宋培晶[1] 黄明君 

机构地区：[1]清华大学土木系 [2]日本新岛物产株式会社

出　　处：《混凝土》2000年第6期22-26,28,共6页Concrete

摘　　要：高性能轻骨料 (HLA)具有独立的微小球形气孔 ,强度高而吸水率低 ,即使在真空或压力条件下 ,吸水率仅为 5% ;普通轻骨料 (CLA)则比较敏感 ,特别在真空或压力条件下 ,吸水率高达 4 0 %以上。对于表观密度为 1 2 g/cm3的HLA ,即使不预先湿水 ,所配制的优质混凝土 ,在 1 5小时内仍能满足泵送要求。对于CLA ,则必须在真空或泵压下预湿比HLA更多的水分 ,方可使其坍落度在 90分钟内保持 15cm以上 ,以满足泵送的要求 ,其结果对于混凝土的强度是不利的 ,而常压预湿水对HLAC和CLAC的强度是没有不利影响的。? High performance lightweight aggregate(WA)has disconnected spherical pores,low water absorption and high compressive strength.It reached the saturation state within several minutes under atmospheric pressure or vacuum,and the vacuum saturation was just 2～3% higher than the atmospheric absorption.Normal lightweight aggregate(LWA) was more sensitive than HPLWA to the increase in pumping pressure or pumping distance/height in another sense.Of the two HPLWA'S with difference in particle density only,the one with particle density of 0\^9 kg/m\+3 performed better in resistance to water penetration than the other one with particle density of 1\^2 kg/m\+3.Slump of concrete with none pre soaked HPLWA could be kept without much loss for 1\^5 hr,so itis not nccessary to pre soak HPLWA for pumping.Even having been pre soaked,normal LWA in concrete would still absorb much more water than HPLWA under pumping pressure.Vacuum saturation had an adverse effect on strength of normal LWA concrete at later ages,while submersion in water for 30 minutes did not influence the strength of concrete with normal LWA or HPLWA at all. 〔

关 键 词：高性能轻骨料 真空吸水 压力吸水 轻骨料混凝土 泵送 

分 类 号：TU528.204[建筑科学—建筑技术科学]