摘要
将金尾矿复合砂作为细集料替代天然砂,研究了金尾矿复合砂替代率对C30~C50混凝土和易性、抗压强度及耐久性的影响,并对力学性能较优组进行了微观结构分析。结果表明:当金尾矿复合砂替代率低于50%(质量分数)时,混合砂具有较优级配;当金尾矿复合砂替代率由0%增加至50%时,需通过调整外加剂掺量来保证金尾矿复合砂混凝土良好的工作性;当金尾矿复合砂替代率为20%~30%时,C30~C50混凝土不同龄期抗压强度、抗碳化性能和抗冻性能较未掺金尾矿复合砂基准组均有较大提升,微观水化产物相互交织增强了结构密实性。
The gold tailing composite sand was used as fine aggregate to replace natural sand,the effect of gold tailing composite sand replacement rate on workability,compressive strength and durability of C30~C50 concrete were studied,and the microstructure of group with better mechanical properties was analyzed.The results show that when the replacement rate of gold tailing composite sand is lower than 50%(mass fraction),the composite sand has better gradation.When the replacement rate of gold tailing composite sand increases from 0%to 50%(mass fraction),it is necessary to adjust admixture amount to ensure the good workability of gold tailing composite sand concrete.When the replacement rate of gold tailing composite sand is 20%~30%(mass fraction),the compressive strength,carbonization resistance and freezing resistance of C30~C50 concrete at different ages are significantly improved compared with the reference group without gold tailing composite sand,and the interweaving microstructure hydration products enhances the structural compactness.
作者
童小根
张凯峰
孟刚
朱王科
王敏
付万长
TONG Xiaogen;ZHANG Kaifeng;MENG Gang;ZHU Wangke;WANG Min;FU Wanzhang(China West Construction North Co.,Ltd.,Xi’an 710065,China;Xi’an Engineering Technology Research Center of Special Concrete and Low-carbon Building Materials,Xi’an 710065,China;College of Civil Engineering,Chang’an University,Xi’an 710064,China)
出处
《硅酸盐通报》
CAS
北大核心
2023年第9期3231-3239,共9页
Bulletin of the Chinese Ceramic Society
基金
中建西部建设科技研发项目(ZJXJ-2021-08)
陕西省科协企业创新争先青年人才托举计划(2021-1-2)。
关键词
金尾矿复合砂
颗粒级配
混凝土
工作性
抗压强度
耐久性能
gold tailing composite sand
particle gradation
concrete
workability
compressive strength
durability