摘要
环氧树脂-混凝土是混合环氧树脂、固化剂和骨料后养护成型的一种新型聚合物混凝土,早期强度增长快是其优异性能之一。本文通过对不同养护龄期的环氧树脂-混凝土进行单轴压缩试验,研究其早龄期压缩性能。试验结果表明,在养护龄期的最初24h内环氧树脂-混凝土压缩强度迅速增大,养护24h的压缩强度达50.3MPa。基于环氧树脂-混凝土的强度增长机制和养护72h后压缩强度趋于稳定的现象,建立了一种基于环氧树脂n级固化反应的环氧树脂-混凝土早龄期压缩强度预测模型,该模型比普通水泥混凝土经典的CEB-FIP、ACI209强度预测模型具有更好的预测效果。基于压缩强度预测和实验结果,建立了考虑龄期的环氧树脂-混凝土单轴压缩本构模型,该模型能较好地预测环氧树脂-混凝土早龄期压缩应力-应变关系。
Epoxy resin-concrete is a new type of polymer concrete prepared by mixing epoxy resin,curing agent and aggregate.Fast growth of early strength is one of its excellent properties.In this paper,the uniaxial compression tests of epoxy resin-concrete at different ages were carried out to study the early compressive performance of epoxy resin-concrete.Test results show that the compressive strength of epoxy resin-concrete increases rapidly during the first 24 hcuring age,and the compressive strength after curing 24 hcan achieve 50.3 MPa.Considering the strength growth mechanism of epoxy resin-concrete and the stability of compressive strength after curing 72 h,a prediction model of early compressive strength of epoxy resin-concrete based on a nth order curing model for epoxy resin was established.The model has better prediction results compared with the classic CEB-FIP and ACI 209 models forconventional cement concrete.Based on the prediction model and experimental results of compressive strength,a uniaxial compression constitutive model of epoxy resin-concrete was established.This model can predict the compressive stress-strain relationship of epoxy resin-concrete at early-age.
作者
黄钰桐
马东鹏
廖雨田
刘逸平
蒋震宇
汤立群
HUANG Yutong;MA Dongpeng;LIAO Yutian;LIU Yiping;JIANG Zhenyu;TANG Liqun(School of Civil Engineeringand Transportation,South China Universityof Technology,Guangzhou 510641,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2019年第12期2735-2744,共10页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(11772132
11772131
11772134)
关键词
环氧树脂-混凝土
早龄期
单轴压缩
本构模型
压缩强度
n级固化模型
epoxy resin-concrete
early-age
uniaxial compression
constitutive model
compressive strength
nth order curing model
