EVA改性EPS混凝土微观结构及性能研究

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摘要：为了改善聚苯乙烯(EPS)轻集料混凝土中EPS颗粒与水泥砂浆界面的黏结性能,提高 EPS
轻集料混凝土的力学性能,采用乙烯-醋酸乙烯酯(EVA)乳液对EPS颗粒表面进行改性,并对改
性前后 EPS 轻集料混凝土的力学性能作了对比试验,结合扫描电镜、X 射线衍射和红外光谱,分析
了EVA乳液对EPS轻集料混凝土性能的影响机理.结果表明:EVA改性改善了EPS轻集科混凝
土的微观结构,使其内部孔洞数量减少,孔洞尺寸趋于减小;使水泥水化更为充分,水化产物组成得
以优化,EPS轻集料混凝土的 180 d 抗压强度和抗折强度得到提高.
关键词：EPS轻集料混凝土；EVA 改性；微观结构；强度
中图分类号：TU528.2
文献标志码:A
doi:10.3969/j.issn.1007-9629.2010.02.022
Properties and Microstructures of EPS Lightweight Concrete Modified with EVA
ZHAO Xiao-yan12, TIAN Wen-ling2, JIANG Xin-liang', ZHOU Ming-jie2
(1.School of Civil Engineering，Tianjin University，Tianjin 300072，China；2.Civil Engineering Institute
（Hebei Research Center of Civil Engineering Technology），Hersity of Technology，Tianjin 300401，China）
Abstract：In order to improve the combination ability of the expanded polystyrene(EPS) beads and the ce
ment mortar in the EPS lightweight concrete, and the mechanical properties of this concrete, the ethylene-
vinyl acetate copolymer(EVA）emulsion was used to modify the EPS surface. Mechanical properties of
EPS light weight concrete were tested；the influence of EVA on EPS lightweight concrete had been ana-
lyzed by means of scanning electron microscope(SEM), X-ray diffraction and infrared spectroscopy spec-
trum. Tests results indicate that EVA emulsion can improve the EPS concretes microstructure, the quanti
ty and size of inner pore can be decreased, hydration of cement can be more sufficient and composition of
cement hydration product can be improved obviously. Accordingly, the 180 d compressive strength and
flexural strength of the EPS concretes are enhanced.
Key words：expanded polystyrene(EPS) lightweight concrete；ethylene-vinyl
acetate(EVA) modified；mi
crostructure；strength
随着国家加大对于墙体材料进行改革的步伐，
外，EPS混凝土还用于浮体结构、地下军事结构的
轻质、保温墙体材料已成为业界探索的重点.将
能量吸收材料以及海上钻油平台的防护结构等(2.
EPS颗粒这种超轻集料以不同掺量加入混凝土中，
EPS混凝土制品对建筑节能意义重大，但EPS
可制作出密度不同的 EPS 混凝土砌块,将其用于房
颗粒表面光滑并且本身憎水,与水泥砂浆的结合力
屋的围护结构,可以获得优良的保温性能口.在国
弱，导致 EPS混凝土的强度一般较低,使其工程应