砂轻页岩陶粒混凝土的强度试验  

Strength Tests of Shale Ceramsite Concrete with Part Sand

作　　者：杨健辉[1,2] 樊晓[2] 徐璐[2] 余建雨 

机构地区：[1]河南理工大学深部矿井建设重点学科开放实验室,河南焦作454000 [2]河南理工大学土木工程学院,河南焦作454000 [3]河南省建设集团有限公司,河南郑州450002

出　　处：《建筑工程（中英文版）》2015年第1期1-6,共6页Architectural Engineering

基　　金：国家自然科学基金项目（41172317）,深部矿井建设省重点学科开放实验室开放基金（2011KF-01）,河南省教育厅科技攻关项目（2010A560010）

摘　　要：为了研究水灰比和河砂取代率对砂轻页岩陶粒混凝土（简称为砂轻混凝土，次轻混凝土）的物理力学性能影响，本文以LC30为例，分别进行了不同影响因素时的抗压与抗折强度试验。结果表明，随着水灰比降低，砂轻混凝土的强度、比强度及折压比逐渐增大，但折压比变化幅度很小；而随着河砂取代率增大，强度较基准组先提高后降低，其临界点为10％；当水灰比较小时，相较于基准组，砂轻混凝土的强度主要受河砂取代率影响；而当水灰比较大时，其强度则主要受水灰比影响；由比强度对比可知，砂轻混凝土较全轻混凝土和普通混凝土在满足强度要求的前提下，能够减轻重量和降低成本，并能提高泵送和施工性能。Taking LC30 for an example, the compressive and flexural strengths were tested under different conditions in order to investigate the influences of water cement ratio （W/C ratio） and sand volume replacement rate （rs） on the physical and mechanical properties of shale ceramsite concrete with part sands （sand lightweight concrete, specified density concrete）. The results show that the strengths, specific strength and flexural-compressive strength ratio all increase with the reducing of W/C ratio, but the flexural- compressive strength ratio change little. The strengths increase firstly and then reduce than the test-piece group with the increasing ofr, and the critical rs is 10%. It is mainly affected by rs when W/C ratio is smaller or by W/C ratio when W/C ratio is bigger for the strengths of sand lightweight concrete than the test-piece group. The specified density concrete can reduce weight than normal concrete, cut down cost, raise pump ability and construction than full lightweight concrete by the comparison of specific strengths under the condition of intensity satisfying with the requirement.

关 键 词：轻质混凝土 次轻混凝土 页岩陶粒混凝土 比强度 折压比 

分 类 号：TU[建筑科学]