云母含量影响着许多地区机制砂应用,由于目前云母含量对混凝土性能的影响研究不够完善,考虑到工程安全问题,国内标准对机制砂中云母含量的限制过于保守,导致许多水电工程中高云母含量人工骨料无法使用。为了使高云母含量的机制砂得到广泛应用,使用高云母含量原岩轧制的人工砂,通过外掺游离云母的方式,研究人工砂中不同游离云母含量对混凝土力学性能、拉伸性能、抗冻性能、抗渗性能的影响。由试验结果可以得出:云母含量对混凝土抗压强度、劈拉强度、抗渗性能影响较小,随着云母含量增加,混凝土单位用水量增加,轴拉强度和极限拉伸值略有降低,抗冻性能变差。
Abstract
The mica content of artificial sand affects its use in many areas. Present researches on the correlation between mica content and concrete performance are not comprehensive. Due to engineering safety considerations, the standards for mica content in artificial sand are overly conservative in China. As a result, artificial aggregates with high mica content are unsuitable for many hydropower projects. To promote the widespread use of artificial sand with high mica content, we propose to add free mica into artificial sand made from parent rock with high mica content. This study aims to investigate the effects of varying content of free mica in artificial sand on concrete performance. Test results demonstrate that mica content has minimal impact on the compressive strength, splitting tensile strength, and impermeability of concrete. However, as mica content increases, the unit water consumption of concrete increases, the axial tensile strength and ultimate tensile value of concrete decrease slightly, and frost resistance degrades.
关键词
混凝土 /
力学性能 /
拉伸性能 /
抗冻性能 /
抗渗性能 /
云母含量 /
人工砂
Key words
concrete /
mechanical performance /
tensile performance /
frost resistance /
impermeability /
mica content /
artificial sand
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参考文献
[1] 郑顺祥, 鄢 勇, 王瑞一嘉, 等. 人工砂云母特性对砂浆性能影响研究[J]. 水力发电学报, 2022, 41(11): 117-123.(ZHENG Shun-xiang, YAN Yong, WANG Rui-yi-jia, et al. Influence of Mica Particle Size and Content on Mortar Properties[J]. Journal of Hydroelectric Engineering, 2022, 41(11): 117-123.(in Chinese))
[2] 邢界泉, 詹树林, 李新宇, 等. 人工砂石粉中云母含量测试方法及其对混凝土性能影响研究[J]. 新型建筑材料, 2015, 42(7): 7-9, 32.(XING Jie-quan, ZHAN Shu-lin, LI Xin-yu, et al. Study on Measuring Method of Mica Content in Manufactured Sand Powder and Its Effect on Performance of Concrete[J]. New Building Materials, 2015, 42(7): 7-9, 32.(in Chinese))
[3] SL/T 352—2020, 水工混凝土试验规程[S]. 北京: 中国水利水电出版社, 2020.(SL/T 352—2020, Test Code for Hydraulic Concrete[S]. Beijing: China Water & Power Press, 2020.(in Chinese))
[4] 李新宇, 任金明, 陈永红. 高云母含量石粉混凝土性能试验研究[J]. 水力发电学报, 2012, 31(4): 211-215.(LI Xin-yu, REN Jin-ming, CHEN Yong-hong. Study on Performances of Concrete with High Content of Mica in Stone Powder[J]. Journal of Hydroelectric Engineering, 2012, 31(4): 211-215.(in Chinese))
[5] DEWAR J D. Effect of Mica in the Fine Aggregate on the Water Requirement and Strength of Concrete[R]. London: Cement Concrete Association,1963:370.
[6] JAMES W. Effect of Mica, Aggregate Coatings, and Water-soluble Impurities on Concrete[J]. Concrete international, 1990,12(12) :54-58.
[7] 水利水电科学研究院结构材料研究所.大体积混凝土[M]. 北京: 水利电力出版社, 1990.(China Institue of Water Resources and Hydropower Research. Mass Concrete[M]. Beijing: China Water Power Press, 1990.(in Chinese))
[8] 李家正, 句广东. 三峡工程古树岭石屑砂混凝土性能研究[J]. 长江科学院院报, 2001,18(3): 53-56.(LI Jia-zheng, JU Guang-dong. Study on Properties of Concrete Prepared with Stone Sands of Gushuling in Three Gorges Project[J]. Journal of Yangtze River Scientific Research Institute, 2001, 18(3): 53-56.(in Chinese))
[9] 伏文勇. 三峡古树岭石屑砂混凝土性能研究及应用[J]. 云南水力发电, 2002,18(1): 59-62, 91.(FU Wen-yong. Study and Application of the Performance of Gushuling Stone Chip Sand Concrete in Three Gorges Project[J]. Yunnan Water Power, 2002, 18(1): 59-62, 91.(in Chinese))
[10] 钟贻辉,周中贵,冉 璟. 高云母含量砂对水工混凝土抗冻性的影响[C]//中国土木工程学会2006混凝土工程耐久性研究和应用研讨会论文集.成都:西南交通大学出版社,2006:168-171.(ZHONG Yi-hui, ZHOU Zhong-gui, RAN Jing. Impact of Sand with High Mica Content on Frost Resistance of Hydraulic Concrete[C]//Proceedings of Concrete Durability and Its Application of the China Civil Engineering Society 2006. Chengdu: Southwest Jiaotong University Press, 2006: 168-171.(in Chinese))
[11] 毛永琳,舒 鑫,张倩倩,等.云母粉对水泥砂浆流变性能的影响[J].新型建筑材料,2020,47(5):33-36.(MAO Yong-lin,SHU Xin,ZHANG Qian-qian,et al. Influence of Mica Fine on Rheology of Cement Mortar[J]. New Building Materials,2020,47(5):33-36.(in Chinese))
[12] GB/T 14684—2022,建设用砂[S].北京:中国标准出版社,2022.(GB/T 14684—2022,Sand for Construction[S].Beijing:Standards Press of China,2022.(in Chinese))
[13] DL/T 5151—2014,水工混凝土砂石骨料试验规程[S].北京:中国电力出版社,2014.(DL/T 5151—2014,Test Colde for Aggregates for Hydraulic Concrete[S].Beijing:China Electric Power Press,2014.(in Chinese))
[14] 黄继武, 李 周. 多晶材料X射线衍射: 实验原理、方法与应用[M]. 北京: 冶金工业出版社, 2012.(HUANG Ji-wu, LI Zhou. X-ray Diffraction of Polycrystalline Materials: Experimental Principle, Method and Application[M]. Beijing: Metallurgical Industry Press, 2012.(in Chinese))
[15] 王子龙,白 银, 丁建彤, 等. 基于X射线衍射法的人工骨料中云母含量分析方法[J]. 水电能源科学, 2017, 35(3): 150-153.(WANG Zi-long, BAI Yin, DING Jian-tong, et al. Analysis Method of Mica Content of Artificial Aggregate Based on X-ray Diffraction[J]. Water Resources and Power, 2017, 35(3): 150-153.(in Chinese))
[16] SL 677—2014, 水工混凝土施工规范[S]. 北京: 中国水利水电出版社, 2015.(SL 677—2014, Specifications for Hydraulic Concrete Construction[S]. Beijing: China Water & Power Press, 2015.(in Chinese))
[17] DL/T 5150—2017,水工混凝土试验规程[S]. 北京: 中国标准出版社, 2020.(DL/T 5150—2017, Test Code for Hydraulic Concrete[S]. Beijing: Standards Press of China, 2020.(in Chinese))
[18] 刘骏霓, 路建国, 高佳佳, 等. 水工混凝土冰冻害机理及抗冻性能研究进展[J]. 长江科学院院报, 2023, 40(3): 158-165.(LIU Jun-ni, LU Jian-guo, GAO Jia-jia, et al. Research Progress of Freezing Damage Mechanism and Frost Resistance of Hydraulic Concrete[J]. Journal of Changjiang River Scientific Research Institute, 2023, 40(3): 158-165.(in Chinese))
基金
国家自然科学基金项目(5207090694)
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