粗骨料取代率对机制砂再生混凝土高温性能的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (6): 2084-2092.

粗骨料取代率对机制砂再生混凝土高温性能的影响

王发静, 王新杰, 朱平华, 刘啸林

常州大学城市与建设学院,常州 213164

收稿日期:2023-11-25 修订日期:2024-01-16 出版日期:2024-06-15 发布日期:2024-06-18
通信作者: 王新杰,博士,教授。E-mail:wangxinjie@cczu.edu.cn
作者简介:王发静(1997—),男,硕士研究生。主要从事再生混凝土方面的研究。E-mail:wangfajing1997@163.com
基金资助:
江苏省研究生科研创新计划(KYCX23_3096)

Influences of Coarse Aggregate Replacement Ratios on High-Temperature Performance of Recycled Concrete with Manufactured Sand

WANG Fajing, WANG Xinjie, ZHU Pinghua, LIU Xiaolin

School of Urban Construction, Changzhou University, Changzhou 213164, China

Received:2023-11-25 Revised:2024-01-16 Online:2024-06-15 Published:2024-06-18

摘要/Abstract

摘要： 为探究不同粗骨料取代率对机制砂再生混凝土(RCM)高温性能的影响,以不同粗骨料取代率(0%、20%、40%、60%、80%、100%,质量分数)制备RCM并研究其单面受高温后的表面形貌、质量损失率、抗压强度、荷载变形曲线及微观形貌。结果表明,粗骨料取代率在40%~60%时,在低于600 ℃的高温试验下RCM表现良好。当温度在200 ℃时,各组试块表面形貌变化不大,质量损失率较小,抗压强度略微上升;当温度在400 ℃时,各组试块表面开始出现裂缝,质量损失率为4.35%~6.47%,抗压强度开始下降,此时粗骨料取代率影响不大;当温度达到600 ℃时,表面形貌变化明显,质量损失率上升到6.42%~8.70%,抗压强度最终降低到基准强度的80%左右,此时粗骨料取代率在40%~60%的试块表现良好;当温度达到800 ℃时,各组试块表面形貌变化进一步加剧,粗骨料取代率大于60%的试块受影响非常明显,同时各类性能参数表明混凝土已完全丧失工作性能。

关键词: 机制砂再生混凝土, 粗骨料取代率, 高温性能, 抗压强度, 荷载变形曲线

Abstract: To explore the influences of different coarse aggregate replacement ratios on the high-temperature performance of recycled concrete with manufactured sand (RCM), RCM specimens were prepared with varying coarse aggregate replacement ratios (0%, 20%, 40%, 60%, 80%, 100%, mass fraction). The surface morphology, mass loss rate, compressive strength, load-deformation curve, and microscopic morphology of RCM were investigated after exposure to high temperatures. Results indicate that the RCM performs well in high-temperature tests below 600 ℃ when the coarse aggregate replacement ratio is between 40% and 60%. At 200 ℃, the specimens in each group show minimal morphological changes, small mass loss rate, and a slight increase in compressive strength. At 400 ℃, cracks begin to appear on the surface of the specimens, with mass loss rate ranging from 4.35% to 6.47%, and compressive strength starts to decline. At this point, the coarse aggregate replacement ratio has a minor impact. At 600 ℃, significant changes in surface morphology are observed, with mass loss rate increasing to 6.42%~8.70%, and compressive strength eventually decreasing to around 80% of the baseline strength. Specimens with coarse aggregate replacement ratio of 40%~60% perform well under these conditions. At 800 ℃, the surface morphology of specimens in all groups intensifies further. The impact becomes particularly pronounced for coarse aggregate replacement ratio exceeding 60%. Simultaneously, various performance parameters indicate that the concrete has experienced a complete loss of effectiveness at this temperature.

Key words: recycled concrete with manufactured sand, coarse aggregate replacement ratio, high-temperature performance, compressive strength, load-deformation curve

中图分类号:

TU528

王发静, 王新杰, 朱平华, 刘啸林. 粗骨料取代率对机制砂再生混凝土高温性能的影响[J]. 硅酸盐通报, 2024, 43(6): 2084-2092.

WANG Fajing, WANG Xinjie, ZHU Pinghua, LIU Xiaolin. Influences of Coarse Aggregate Replacement Ratios on High-Temperature Performance of Recycled Concrete with Manufactured Sand[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 2084-2092.

参考文献

[1] ALI KHAN A, ALI KHAN M, DOMADA R V V, et al. Fire modelling framework for investigating tall building fire: a case study of the Plasco Building[J]. Case Studies in Thermal Engineering, 2023, 45: 103018.
[2] KHALED AL-BASHITI M, NASER M Z. What can we learn from over 1 000 tests on fire-induced spalling of concrete? A statistical investigation of critical factors and unexplored research space[J]. Construction and Building Materials, 2023, 403: 133200.
[3] ZHANG K, QING Y, UMER Q, et al. How construction and demolition waste management has addressed sustainable development goals: exploring academic and industrial trends[J]. Journal of Environmental Management, 2023, 345: 118823.
[4] SOTO-PAZ J, ARROYO O, TORRES-GUEVARA L E, et al. The circular economy in the construction and demolition waste management: a comparative analysis in emerging and developed countries[J]. Journal of Building Engineering, 2023, 78: 107724.
[5] LI J R, YAO Y, ZUO J, et al. Key policies to the development of construction and demolition waste recycling industry in China[J]. Waste Management, 2020, 108: 137-143.
[6] XIAO J Z, QIANG C B, NANNI A, et al. Use of sea-sand and seawater in concrete construction: current status and future opportunities[J]. Construction and Building Materials, 2017, 155: 1101-1111.
[7] S K K, SINGH S K, CHOURASIA A. Alternative fine aggregates in production of sustainable concrete: a review[J]. Journal of Cleaner Production, 2020, 268: 122089.
[8] SHEN W G, LIU Y, WANG Z W, et al. Influence of manufactured sand’s characteristics on its concrete performance[J]. Construction and Building Materials, 2018, 172: 574-583.
[9] SHARMA R, SENTHIL K. An investigation on mechanical and microstructural properties of hybrid fiber reinforced concrete with manufactured sand and recycled coarse aggregate[J]. Journal of Building Engineering, 2023, 69: 106236.
[10] HABERT G, MILLER S A, JOHN V M, et al. Environmental impacts and decarbonization strategies in the cement and concrete industries[J]. Nature Reviews Earth & Environment, 2020, 1: 559-573.
[11] 庞建勇, 郑瑞琪, 胡秀月, 等. 高温后冷却方式对玄武岩纤维混凝土力学性能的影响[J]. 硅酸盐通报, 2024, 43(1): 92-101.
PANG J Y, ZHENG R Q, HU X Y, et al. Effect of cooling method after high temperature on mechanical properties of basalt fiber reinforced concrete[J]. Bulletin of the Chinese Ceramic Society, 2024, 43(1): 92-101 (in Chinese).
[12] 逄鲁峰, 庞伟琪, 张硕, 等. 机制砂取代率对高温后混凝土性能的影响[J]. 混凝土与水泥制品, 2023(6): 26-30+35.
PANG L F, PANG W Q, ZHANG S, et al. Effect of mechanism sand replacement rate on the performance of concrete after high temperature[J]. China Concrete and Cement Products, 2023(6): 26-30+35 (in Chinese).
[13] ZHAO H, LIU F Q, YANG H. Residual compressive response of concrete produced with both coarse and fine recycled concrete aggregates after thermal exposure[J]. Construction and Building Materials, 2020, 244: 118397.
[14] MENG E C, YU Y L, ZHANG X G, et al. Experimental and theoretical research on the mechanical performance of totally recycled concrete under triaxial compression after high temperatures[J]. Construction and Building Materials, 2020, 261: 120012.
[15] 陈建奎, 王栋民. 高性能混凝土(HPC)配合比设计新法: 全计算法[J]. 硅酸盐学报, 2000, 28(2): 194-198.
CHEN J K, WANG D M. New mix design method for HPC: overall calculation method[J]. Journal of the Chinese Ceramic Society, 2000, 28(2): 194-198 (in Chinese).
[16] 王卫中, 冯忠绪, 张晓波. 混凝土二次搅拌的机理分析[J]. 长安大学学报(自然科学版), 2008, 28(1): 103-106.
WANG W Z, FENG Z X, ZHANG X B. Mechanism study of concrete secondary mixing[J]. Journal of Chang’an University (Natural Science Edition), 2008, 28(1): 103-106 (in Chinese).
[17] WANG T, YU M, SHAN W T, et al. Post-fire compressive stress-strain behaviour of steel fibre reinforced recycled aggregate concrete[J]. Composite Structures, 2023, 309: 116735.
[18] ROY S, MIURA T, NAKAMURA H, et al. High temperature influence on concrete produced by spherical shaped EAF slag fine aggregate-Physical and mechanical properties[J]. Construction and Building Materials, 2020, 231: 117153.
[19] XU Z H, LI J, WU P T, et al. Experimental investigation of triaxial strength of ultra-high performance concrete after exposure to elevated temperature[J]. Construction and Building Materials, 2021, 295: 123689.