超细高活性矿物掺合料对UHPC水化和收缩性能的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (2): 461-468.

超细高活性矿物掺合料对UHPC水化和收缩性能的影响

卫煜^1,2,3, 陈平^1,2,3, 明阳^2,3, 骆俊辉⁴, 张革芬⁵, 吴勇⁵

1.桂林理工大学材料科学与工程学院,桂林 541004;
2.桂林理工大学广西工业废渣建材资源利用工程技术研究中心,桂林 541004;
3.桂林理工大学广西壮族自治区北部湾绿色海工材料工程研究中心,桂林 541004;
4.广西北投交通养护科技集团有限公司,南宁 530201;
5.广西交通设计集团有限公司,南宁 530029

收稿日期:2021-07-24 修回日期:2021-09-23 出版日期:2022-02-15 发布日期:2022-03-01
通讯作者: 明阳,工程师。E-mail:my574081667@126.com
作者简介:卫煜(1997—),男,硕士研究生。主要从事绿色建材方面的研究。E-mail:1078669255@qq.com
基金资助:
广西自然科学基金(2020GXNSFBA297034);广西重点研发计划(桂科AB19259008)

Effects of Ultrafine and Highly Active Mineral Admixtures on Hydration and Shrinkage Properties of UHPC

WEI Yu^1,2,3, CHEN Ping^1,2,3, MING Yang^2,3, LUO Junhui⁴, ZHANG Gefen⁵, WU Yong⁵

1. School of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China;
2. Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials, Guilin University of Technology, Guilin 541004, China;
3. Guangxi Beibu Gulf Engineering Research Center for Green Marine Materials, Guilin University of Technology, Guilin 541004, China;
4. Guangxi Beitou Traffic Maintenance Technology Group Co., Ltd., Nanning 530201, China;
5. Guangxi Transportation Design Group Co., Ltd., Nanning 530029, China

Received:2021-07-24 Revised:2021-09-23 Online:2022-02-15 Published:2022-03-01

摘要/Abstract

摘要： 本试验研究了超细高活性矿物掺合料(超细掺合料)与硅灰以单掺、复掺的方式制备超高性能混凝土(UHPC),分析了复掺不同掺量超细掺合料对UHPC的工作性、力学性能、水化热和收缩性能的影响。结果表明:UHPC流动性随超细掺合料掺量的增加而增加,跳桌流动度最高为275 mm;将超细掺合料与质量分数为10%的硅灰以复掺的方式制备UHPC时,随超细掺合料掺量的增加,UHPC抗折强度先增加后降低,抗压强度先增加后趋于平稳,最大抗折强度和抗压强度分别为25.9 MPa和150.0 MPa;超细掺合料与质量分数为10%的硅灰复掺制备的UHPC水化热随超细掺合料掺量增加,先增大后减小;复掺质量分数为10%的超细掺合料与质量分数为10%的硅灰制备的UHPC早期收缩量最小,比单掺质量分数为20%的硅灰制备的UHPC低50.92%。

关键词: 超细掺合料, UHPC, 水化热, 收缩, 流动性, 力学性能

Abstract: Ultra-high performance concrete (UHPC) was prepared by ultrafine and highly active mineral admixtures (ultrafine admixtures) and silica fume in single or compound admixture. The effects of ultrafine admixtures with different dosage on the workability, mechanical properties, hydration heat and shrinkage properties of UHPC were analyzed. The results show that the fluidity of UHPC increases with the increase of the ultrafine admixtures, and the highest fluidity of jumping table is 275 mm. When UHPC is prepared by mixing the ultrafine admixtures with 10% (mass fraction) silica fume, the flexural strength increases first and then decreases with the increase of ultrafine admixture, while the compressive strength increases first and then keeps steady. The maximum flexural strength and compressive strength are 25.9 MPa and 150.0 MPa, repectively. The hydration heat of UHPC cementitious material prepared by compounding ultrafine admixture and10% (mass fraction) silica fume increases at first and then decreases with the increase of ultrafine admixture. The early shrinkage of UHPC prepared by compounding the ultrafine admixture and silica fume with a mass fraction of 10%, is the smallest, which is 50.92% lower than that of UHPC prepared by silica fume with a mass fraction of 20% alone.

Key words: ultrafine admixture, UHPC, hydration heat, shrinkage, fluidity, mechanical property

中图分类号:

TU528

卫煜, 陈平, 明阳, 骆俊辉, 张革芬, 吴勇. 超细高活性矿物掺合料对UHPC水化和收缩性能的影响[J]. 硅酸盐通报, 2022, 41(2): 461-468.

WEI Yu, CHEN Ping, MING Yang, LUO Junhui, ZHANG Gefen, WU Yong. Effects of Ultrafine and Highly Active Mineral Admixtures on Hydration and Shrinkage Properties of UHPC[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 461-468.

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