纳米改性混凝土路用性能试验研究
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摘要
为研究纳米CaCO_3改性混凝土的路用性能,对掺量为0、0.5%、1.0%和1.5%的纳米CaCO_3改性混凝土进行抗压强度、弯拉强度、冻融循环、干缩、断裂韧性及灼烧试验,测得不同纳米CaCO_3掺量下混凝土的抗压强度、弯拉强度、干缩量、断裂韧度、化学结合水含量及不同冻融循环次数下混凝土的弯拉强度损失、质量损失和相对动弹模量。研究结果表明:掺入纳米CaCO_3后,路用混凝土的弯拉强度、抗冻性能、断裂韧度均有所提高,且掺量为1%时性能最佳;掺入纳米CaCO_3,对抗压强度影响不大,但增加了混凝土的干缩量,对路面是不利的;纳米CaCO_3可加快水泥水化速度,增加水泥水化程度,改善混凝土界面过渡区,是提高混凝土路用性能的主要原因。
In order to study the pavement performance of nanometer CaCO_3 modified concrete,compressive strength,flexural-tensile strength,freeze-thaw cycle,drying and shrinkage,fracture toughness and calcination tests are carried out on nanometer CaCO_3 modified concrete with the dosage of0,0.5%,1.0% and 1.5%.Compressive strength,flexural-tensile strength,rate of drying and shrinkage,fracture toughness,content of chemically combined water,loss of flexural-tensile strength,loss of weight,and relative modulus are obtained.The results indicate that the flexural-tensile strength,anti-frost property and fracture toughness are improved after the nanometer CaCO_3 being mixed,and 1%dosage is the best;there is minor change on compressive strength,but the rate of drying and shrinkage is increased significantly,which is adverse for the pavement.The nanometer CaCO_3 can accelerate the speed of cement hydration,increase the extent of cement hydration,improve the interface transition zone of concrete,and these are the main reasons for the nanometer CaCO_3 improving the pavement performance of concrete.
In order to study the pavement performance of nanometer CaCO_3 modified concrete,compressive strength,flexural-tensile strength,freeze-thaw cycle,drying and shrinkage,fracture toughness and calcination tests are carried out on nanometer CaCO_3 modified concrete with the dosage of0,0.5%,1.0% and 1.5%.Compressive strength,flexural-tensile strength,rate of drying and shrinkage,fracture toughness,content of chemically combined water,loss of flexural-tensile strength,loss of weight,and relative modulus are obtained.The results indicate that the flexural-tensile strength,anti-frost property and fracture toughness are improved after the nanometer CaCO_3 being mixed,and 1%dosage is the best;there is minor change on compressive strength,but the rate of drying and shrinkage is increased significantly,which is adverse for the pavement.The nanometer CaCO_3 can accelerate the speed of cement hydration,increase the extent of cement hydration,improve the interface transition zone of concrete,and these are the main reasons for the nanometer CaCO_3 improving the pavement performance of concrete.
引文
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[2]何志鹏,夏举佩,郑森.外加剂对磷石膏基复合胶凝材料性能的影响[J].硅酸盐通报,2016,(6):1946-1951.
[3]曹雅娴,贾尚华.碳-聚丙烯混杂纤维混凝土力学性能试验研究[J].公路,2016,(10):220-224.
[4]覃丽坤,宋宏伟,王秀伟.海水环境下粉煤灰混凝土的抗冻融性研究[J].中外公路,2015,35(6).
[5]华卫兵,董跃,吴海兵,等.矿物掺合料对高性能混凝土长期耐久性能的影响[J].公路,2016,(11):184-188.
[6]牛晓伟,王永维,李强,等.多壁碳纳米管/水性环氧树脂复合改性多孔水泥混凝土性能研究[J].公路,2017,(1):174-179.
[7]霍俊芳,李展霞,侯永利,等.石灰石粉混凝土抗冻性能试验研究[J].混凝土,2016,(8).
[8]陈振伟,胡卫国.不同橡胶处理方式对改性水泥混凝土力学性能影响[J].中外公路,2016,(5):258-261.
[9]朱昀喆.纳米改性混凝土的抗盐冻性能及其改性机理研究[D].哈尔滨:哈尔滨工业大学,2015.
[10] JTG D40-2011公路水泥混凝土路面设计规范[S].
[11] JGJ 55-2011普通混凝土配合比设计规程[S].
[12]许并社.纳米材料及应用技术[M].北京:化学工业出版社,2004.