石轻页岩陶粒混凝土的强度试验研究  

Strength tests of shale ceram site concrete with part gravel coarse aggregates

作　　者：杨健辉[1,2] 徐璐[2] 樊晓[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：《混凝土》2015年第3期82-86,共5页Concrete

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：为了探讨水胶比和碎石体积取代率对次轻页岩陶粒混凝土的物理力学性能影响,通过正交试验得到了LC20最佳配合比,然后再通过不同水胶比(0.30、0.35、0.40)和不同碎石体积取代率rg(0、10%、20%、30%、40%、50%)进行试验,并通过干表观密度、抗压强度、抗折强度、劈拉强度、比强度和折压比,以及断截面破坏形态,探讨其变化规律。结果表明,当碎石取代率为30%,水胶比为0.30时,次轻页岩陶粒混凝土的上述各项指标除折压比外均为最优,并能同步提高强度和韧性,而且还可以有效弥补页岩陶粒产量有限、价格较高和施工性能较差的缺陷。The tests were achieved for the influence of water - binder ratio（W/B） and gravel volume replacement rate（ rg ） on the physi- cal and mechanical properties of shale ceramsite concrete. Firstly, the best mix proportion of LC20 was obtained by the orthogonal exper- iments.Secondly ,the specified density concrete was tested by the different W/B （0.30,0.35,0.40）and rg （0,10% ,20% ,30% ,40% ,50% ）, and the change rules are founded by the indexes of dry apparent density, compressive strength, flexural strength, tensile splitting strength, specific strength, flexural - compressive strength ratio, and the broken section patterns. The results show the above indexes are the best except the flexural -compressive strength ratios when rg is 30%and W/B is 0.30, and the strength and toughness are also im- proved simultaneously. Also, the specified density concrete can make up for the disadvantages such as production shortage, high cost, and poor construction performance, and so on.

关 键 词：轻质混凝土 次轻混凝土 石轻页岩陶粒混凝土 破坏形态 

分 类 号：TU528.041[建筑科学—建筑技术科学]