摘要
采用三因素、四水平的正交试验,研究橡胶细集料掺量、粗细程度及煅烧温度对橡胶集料高强混凝土高温前后性能的影响。其中橡胶集料等体积取代砂子的取代率为0%、1.7%、3.4%、5.1%,细度模数分别为3.5、2.75、2.0、1.4,煅烧温度为常温、600℃、800℃、1000℃。研究结果表明:三因素对橡胶集料高强混凝土高温前后抗压强度、拉压比、表观密度剩余百分率的影响主次顺序是:煅烧温度>橡胶集料掺量>橡胶集料粗细程度,对劈拉强度剩余百分率影响主次顺序是:煅烧温度>橡胶集料粗细程度>橡胶集料掺量;建立了考虑高温劣化影响的高强混凝土强度等回归方程。高强混凝土中低掺中等粗细程度的橡胶细集料,高温时可提高高强混凝土的残余强度,且有利于改善高强混凝土的高温韧性。
Three factors and four levels orthogonal test was used to research the influence of rubber aggregate dosage,rubber aggregate thickness and calcining temperature to the behavior of high strength concrete modified with rubber fine aggregate before and after high temperature,in which the sand was replaced by rubber aggregate volume equivalently with the substitution rate of 0%,1. 7%,3. 4% and5. 1%,fineness modulus of 3. 5,2. 75,2. 0 and 1. 4,calcining temperature of normal temperature,600℃,800 ℃ and 1000 ℃. Results showed that based on the degree of influence about remaining percentage of compressive strength,the tension-compression ratio and the apparent density of high strength concrete modified with rubber fine aggregate before and after high temperature,the order of three factors is that rubber aggregate dosage is more than rubber aggregate thickness,but no more than calcining temperature. As for remaining percentage of split tensile strength,the order of three factors is that rubber aggregate thickness is more than rubber aggregate dosage,but no more than calcining temperature.Regression equations was established by considering strength of high strength concrete which have taken the influence of high temperature degradation into consideration. A low moderate dosage and medium thickness of rubber aggregate will improve not only the residual strength of high strength concrete,butalso the high temperature toughness of it.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2015年第S1期27-34,共8页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金委员会与神华集团有限公司联合资助项目(U1261122)
辽宁省教育厅科学研究项目(L2012123)
关键词
橡胶集料混凝土
高强混凝土
橡胶颗粒
高温
concrete modified with rubber fine aggregate
high strength concrete
rubber aggregate
high temperature
