橡胶改性轻骨料混凝土材料性能试验研究.pdf

2013年第5期(总第283期
凝
土
原材料及辅助物料
Number 5 in 2013(Total No 283)
Concrete
MATERIAL AND ADMINICLE
doi:10.39695.iss.1002-3550.2013.05.030
橡胶改性轻骨料混凝土材料性能试验硏究
静行,庞瑞
(河南工业大学土木建筑学院,河南郑州45000
摘要:试验研究了橡胶改性轻骨料混凝土的强度、耐磨性、干缩性等指标,并考虑了羧基丁苯聚合物对橡胶颗粒改性效果的
影响。结果表明:橡胶改性轻骨料混凝土的强度降低较多,但破坏模式发生了根本变化,在强度试验破坏过程中,表现出明显的延
性特征,羧基丁萃聚合物可以提髙橡胶改性轻骨料混凝土的密实度,改善橡胶颗粒与骨料界面黏结性能,从而提高橡胶改性轻骨
料混凝土的抗压强度和抗弯拉强度;橡胶改性轻骨料混凝土的耐磨性显著提高,但干缩率有所增大;羧基丁苯聚合物的掺人使橡
胶改性轻骨料混凝土的干缩率大大降低,而耐磨性则变差,但仍高于轻骨料混凝土的耐瞻性。
关键词:橡胶;轻骨料;聚合物;耐磨性;干缩
中图分类号:TU528.041文献标志码:A文章编号:1002-3550(02013)05-0107-03
Experimental study on performance of rubberized lightweight aggregate concrete with polymer
JNG Hang, PANG Rui
( School of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou 450001, China)
Abstract: The strength, abrasion resistance and dry-shrinkage property of rubberized li ht agregate concrete were studied. The
results howed that, with the addition of uer power, the strength of rubberized lightwei ht ag regate concrete decreased obviously, but
simultaneously the failure patterns exhibit a dramatic yielding pattern during the compressive tests. The compactness and the bond perfor-
mance of aggregate-concrete Interface of rubberized lightweight aggregate concrete are improved by adding carboxylic styrene-butadiene
rubber la ex(SD622)and the compressive sren h and flexural strength were increased. The abrasion resistance of rubberized lightweight
aggregate concrete was mproved dramatic, but the dry-shrinkage ratio was increasc. The dry-shrinkage ratio of rubberized lightweight ag-
gregate concrete with D622S polymer was reduced dramatic which was much less than that of lightweight aggregate concrete while th
abrasion resistance of PRC was reduced, but its abrasion resistance was still better than that of lightweight agregate concrete
Key words: rubber; lightweight aggregate; polymer; abrasion resistance; dry-shrinkag
0引言
水泥。
细骨料:普通中砂,细度模数2.6,堆积密度为1450kg/m
将废旧汽车轮胎经机械粉碎等手段加工成橡胶颗粒,
粗骨料:湖北宜昌产5~20mm800级碎石型页岩陶粒,
作为集料运用到水泥混凝土中,近年来受到工程界的广泛
吸水率2%(1h)。
关注。国内外研究表明,掺加橡胶的水泥混凝土虽然强度
橡胶粒:溯北黄石产10~20目连续级配橡胶粉。
会降低,但具有优越的变形能力和抗冲击性能及很好的阻
聚合物:上海产羧基丁苯聚合物乳液(SD622S),固含
裂、抗渗性等优点。而且橡胶集料混凝土本身也是一种环保
产品,有利于固体废物资源化。閃此,具有广阔的应用前景。
量为47%。
外加剂:FDN高效减水剂。
目前,国内外对橡胶改性普通骨料混凝土的研究较多,
对于橡胶改性轻骨料混凝土的各种性能的研究还比较少?。1.2试验方法
本试验对橡胶颗粒代替部分细集料后的轻骨料混凝土的
试验配合比参照轻骨料混凝土配合比设计方法进行
强度、干缩率、耐磨性等性能进行研究,并考虑羧基丁苯聚设计,采用松散体积法,轻骨料混凝土强度等级为
合物对橡胶颗粒改性效果的影响,为今后橡胶改性轻骨料这里把橡胶颗粒按细集料来对待,即保持细集料总体积不
混凝土进一步的试验、理论分析及工程应用提供试验依据。变,用橡胶颗粒同体积取代部分砂。轻骨料混凝士([C)橡胶
轻骨料混凝土(RLC)和聚合物橡胶轻骨料混凝士(PRLC)的
1原材料与试验方法
试验用配合比见表1。
11原材料
混凝土强度试验和干缩性试验按照JTGE30-2005
水泥:采用湖北亚东水泥有限公司生产的P?O42.5级《公路工程水泥及水泥混凝士试验规程》进行。耐磨性试验
收稿日期:2012-11-21