摘要
为了提高锂渣、磷渣等固体废弃物的综合利用率,以锂渣和磷渣为复合掺和料替代部分水泥制备超高性能混凝土(UHPC),通过改变复合掺和料掺量,研究其对UHPC抗压强度和微观结构的影响规律。结果表明,与基准组相比,随着复合掺和料掺量的增加,UHPC的3 d抗压强度逐渐降低,复合掺和料对UHPC早期强度不利,但能显著增强后期抗压强度。当复合掺和料掺量为25%时,UHPC的28 d抗压强度达到最大值,为145.78 MPa。微观分析表明,随着龄期的增加,复合掺和料的活性得到充分发挥,其活性SiO_(2)和Al_(2)O_(3)会与Ca(OH)_(2)反应生成大量水化硅酸钙(C-S-H)、水化硫铝酸钙(AFt)等水化产物,Ca^(2+)消耗进一步促进磷渣水化,固废协同耦合水化,促进UHPC后期强度增加。
In order to improve the comprehensive utilization rate of solid waste such as lithium slag and phosphorus slag,ultra-high performance concrete(UHPC)was prepared by using lithium slag and phosphorus slag as composite admixtures instead of partial cement.The effect of changing the amount of composite admixtures on the compressive strength and microstructure of UHPC was studied.The results showed that compared with the reference group,the 3 d compressive strength of UHPC gradually decreased with the increase of the composite admixture content.Although the composite admixture was unfavorable for the early strength of UHPC,it had a significant enhancement effect on the later compressive strength.When the content of the composite admixture was 25%,the 28 d compressive strength of UHPC reached the maximum value of 145.78 MPa.Microscopic analysis showed that with the increase of age,the activity of the composite admixture was fully utilized,and its active SiO_(2) and Al_(2)O_(3) would react with Ca(OH)_(2) to generate a large number of C-S-H,AFt and other hydration products.Ca^(2+)consumption further promoted the hydration of phosphorus slag,solid-waste synergistic coupling hydration,and promoted the later strength increase of UHPC.
作者
张延年
朱德斌
李雪萌
韩东
汪青杰
赵健
安路明
Zhang Yannian;Zhu Debin;Li Xuemeng;Han Dong;Wang Qingjie;Zhao Jian;An Luming(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,Liaoning 110168;School of Civil Engineering,Dalian Jiaotong University,Dalian,Liaoning 116028;Liaoning Provincial Product Quality Supervision and Inspection Institute,Shenyang,Liaoning 110031;School of Science,Dalian Jiaotong University,Dalian,Liaoning 116028;China Railway Construction Bridge Engineering Bureau Group Fourth Engineering Co.,Ltd.,Guangzhou,Guangdong 510000)
出处
《非金属矿》
2024年第2期85-88,93,共5页
Non-Metallic Mines
基金
国家自然科学基金重点项目(52234004)
沈阳市科技项目(23-407-3-02)。
关键词
锂渣
磷渣
超高性能混凝土
抗压强度
耦合水化
lithium slag
phosphorus slag
ultra-high performance concrete
compressive strength
coupled hydration
