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硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (1): 92-99.

所属专题: 水泥混凝土

• 水泥混凝土 • 上一篇    下一篇

石粉种类及含量对C60机制砂混凝土性能的影响

姜同辉1, 杨雄峰1, 阳佳丁1, 钱枫华1, 平乐1, 杨腾宇2, 王晶3, 张营3, 冷发光3   

  1. 1.广东佛盈汇建工程管理有限公司,佛山 528051;
    2.佛山市交通科技有限公司,佛山 528000;
    3.建研建材有限公司,北京 100013
  • 收稿日期:2022-07-18 修订日期:2022-09-20 出版日期:2023-01-15 发布日期:2023-02-15
  • 通信作者: 王 晶,教授级高级工程师。E-mail:wangking3007@126.com
  • 作者简介:姜同辉(1980—),男,高级工程师。主要从事道路材料开发与工程管理。E-mail:jiangtongh@163.com
  • 基金资助:
    国家重点研发计划(2017YFB0309900)

Effects of Stone Powder Type and Content on C60 Manufactured Sand Concrete Performance

JIANG Tonghui1, YANG Xiongfeng1, YANG Jiading1, QIAN Fenghua1, PING Yue1, YANG Tengyu2, WANG Jing3, ZHANG Ying3, LENG Faguang3   

  1. 1. Guangdong Foyinghuijian Engineering Management Co., Ltd., Foshan 528051, China;
    2. Foshan Transportation Science and Technology Co., Ltd., Foshan 528000, China;
    3. CABR Institute of Building Materials Co., Ltd., Beijing 100013, China
  • Received:2022-07-18 Revised:2022-09-20 Online:2023-01-15 Published:2023-02-15

摘要: 为研究不同机制砂粗颗粒(0.075~4.75 mm)与石粉(<75 μm)的质量比(砂粉比)对岩石粉混凝土性能的影响,使用岩石粉(石灰石粉和花岗岩石粉)以不同质量比取代机制砂制备高强混凝土,测试不同砂粉比条件下混凝土流动性能、抗压强度和耐久性能(干燥收缩率及电通量)的演变规律。结果表明,机制砂的砂粉比不低于9时,砂粉比降低有利于改善混凝土拌合物的和易性,增强混凝土抗压强度和耐久性能。进一步降低砂粉比对混凝土的干燥收缩性能影响较小,但对混凝土流动性、力学性能和抗氯离子渗透性不利。降低砂粉比有利于提高机制砂混凝土的密实性,但过低的砂粉比容易造成混凝土需水量升高,游离态石粉颗粒含量增大,对混凝土性能不利。

关键词: 机制砂, 混凝土, 石粉含量, 抗压强度, 电通量, 微观结构

Abstract: To study the influence of different mass ratio of coarse particles (0.075~4.75 mm) to stone powder (<75 μm) of manufactured sand on the performance of rock powder concrete, rock powder (limestone powder and granite powder) was used to replace manufactured sand with different mass ratio to prepare high-strength concrete. The evolution laws of concrete fluidity, compressive strength, and durability (drying shrinkage and electric flux) under different sand-powder ratio were tested. The results show that when the sand-powder ratio of manufactured sand is not less than 9, the reduction of sand-powder ratio is conducive to improve the workability of concrete mixture and enhance the compressive strength and durability of concrete. Further reducing the sand-powder ratio has little effect on the drying shrinkage performance, but it is unfavorable to the fluidity, mechanical properties, and chloride ion permeability of concrete. Reducing the sand-powder ratio is conducive to improve the compactness of manufactured sand concrete. However, too low sand-powder ratio is easy to increase the water demand of concrete, and the content of free stone powder particles is too high, which will weaken the spatial structure of hydration products, and be unfavorable to the performance of concrete.

Key words: manufactured sand, concrete, stone powder content, compressive strength, electric flux, microstructure

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