基于随机骨料模型的EPS颗粒混凝土蒸养损伤及微观分析  

Damage and microscopic analysis of steam⁃cured EPS particle⁃filled concrete based on random aggregate model

作　　者：杨蕊[1] 郭杨 周金友 YANG Rui;GUO Yang;ZHOU Jinyou(Zhejiang Changzheng Vocational&Technical College,Hangzhou 310013,China;Institute of Geotechnical Engineering,Southeast University,Nanjing 210096,China;China Railway 14th Engineering Bureau Big Shield Engineering Co,Ltd,Nanjing 211899,China)

机构地区：[1]浙江长征职业技术学院,杭州310023 [2]东南大学岩土工程研究所,南京210096 [3]中铁十四局大盾构工程有限公司,南京211899

出　　处：《中国塑料》2024年第7期74-78,共5页China Plastics

基　　金：浙江省高等学校访问工程师校企合作项目(FG2020286)。

摘　　要：为研究掺入废弃塑料对缓解混凝土蒸汽引起的热损伤机理,开展了不同聚苯乙烯泡沫塑料(EPS)颗粒掺量混凝土的抗压强度试验,建立了考虑界面过渡区效应的随机骨料模型,模拟了蒸养环境下混凝土内部的热应力分布,并通过压汞试验和扫描电子显微镜照片揭示了EPS颗粒掺入对蒸养试件孔结构特征和微观演化规律的影响。结果表明,随EPS颗粒掺量的增加,蒸养试件强度略有升高,EPS颗粒掺入有利于蒸养混凝土后期强度的发展;蒸养引起的热应力得到显著缓解,微裂缝和贯通裂缝数量降低,有效抑制蒸养引起的热损伤;掺入EPS颗粒细化了蒸养混凝土孔结构,缩小了EPS颗粒⁃水泥基体界面的裂隙宽度。To study the mechanism of thermal damage of concrete caused by steam when mixed with waste plastics,the compressive strength tests of concrete with different contents of polystyrene foam(EPS)particles were carried out,and the effect of EPS⁃particle incorporation on the porous structure characteristics and microscopic evolution of steam⁃cured specimens was revealed through mercury intrusion test and SEM observation.The results indicated that the strength of steam⁃cured specimens increased slightly with an increase in the EPS content.The introduction of EPS particles is beneficial for the development of the later strength of the steam⁃cured concrete.The thermal stress caused by steam curing was significantly alleviated,and the number of micro cracks and through cracks decreased,effectively suppressing the thermal damage caused by steam curing.The presence of EPS particles refined the pore structure of the steam⁃cured concrete and reduced the crack width on the interface of the EPS particle and cement matrix.

关 键 词：聚苯乙烯泡沫塑料颗粒混凝土 蒸养损伤 随机骨料模型 孔结构 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]