轻骨料预湿程度对混合骨料混凝土力学性能的影响  

Effect of prewetting degree of lightweight aggregate on mechanical properties of specified density concrete

作　　者：张宝生[1] 孔丽娟[1] 袁杰[1] 葛勇[1] 

机构地区：[1]哈尔滨工业大学材料学院,黑龙江哈尔滨150001

出　　处：《混凝土》2006年第10期24-26,30,共4页Concrete

基　　金：交通部西部交通建设资助项目(200331882008)

摘　　要：研究了用不同预湿程度的页岩陶粒与碎石以体积比1:1混合配制的混合骨料混凝土拌合物性能和力学性能。结果表明,随着陶粒预湿时间的延长,混合骨料混凝土拌合物坍落度经时损失逐渐减小,7d抗压强度逐渐降低,劈拉强度与抗折强度在轻骨料预湿时间小于1h时略有增加。28d抗压强度、劈拉强度、抗折强度和弹性模量都逐渐增加。用预湿1h的陶粒配制的混合骨料混凝土7d与28d的拉压比和折压比与轻骨料混凝土相比几乎没有降低,其弹性模量比同条件的轻骨料混凝土高32.9%,比强度高10.5%。The workability of fresh concrete and mechanical properties of hardened specified density concrete that incorporated pre-wetted shale ceramsite in different degrees and crushed stone in proportion of 1：1 by volume was studied. The results show that as prewetting time increases, the age loss of specified density concrete mixture decreases, and compressive strength at 7 days gradually reduces, but splitting tensile strength and flexural strength at 7 days has small increase when shale ceramsite prewetted lhr, and the compressive strength, splitting tensile strength, flexural strength and elastic modulus at 28 days all gradually increase. The tension-compression ratio and flex-compression ratio of specified density concrete incorporated lh prewetted shale ceramsite nearly have no reduction compared with lightweight concrete. The elastic modulus of specified density concrete is 32.9% higher than that of lightweight concrete, and specific strength is 10.5% higher than lightweight concrete.

关 键 词：页岩陶粒 混合骨料混凝土 劈拉强度 弹性模量 

分 类 号：TU528.041[建筑科学—建筑技术科学]