刘嘉良1, 姜瑞双2,3, 辛崇升4, 郭保林2,3, 邢又家4, 李 飞1
（1. 北京建筑大学土木与交通工程学院, 北京100044; 2. 山东省交通科学研究院, 山东济南250031;3. 山东省桥隧结构性能评估与耐久提升工程实验室, 山东济南250031; 4. 济南金曰公路工程有限公司, 山东济南250101）
引用格式：刘嘉良, 姜瑞双, 辛崇升, 等. 高吸附性花岗岩机制砂对混凝土性能的影响[J]. 中国粉体技术, 2023, 29(5): 81-91.LIU J L, JIANG R S, XIN C S, et al. Effect of high adsorption granite manufactured sand on concrete properties[J]. China Powder Science and Technology, 2023, 29(5): 81-91.
DOI：10.13732/j.issn.1008-5548.2023.05.010
收稿日期：2023-05-10,修回日期：2023-07-24，在线出版时间：2023-08-29 13：42。
基金项目：国家重点研发计划项目,编号:2022YFC3803404。
第一作者简介：刘嘉良(1997—),男,硕士研究生,研究方向为花岗岩机制砂混凝土。E-mail: 530267642@qq.com。
通信作者简介：李飞(1981—),男,教授,博士,硕士生导师,研究方向为高性能混凝土机制砂。E-mail: lifei@bucea.edu.cn。
摘要：花岗岩机制砂用作混凝土骨料是缓解河砂资源短缺的重要方式之一, 为了研究高吸附性花岗岩机制砂对混凝土性能的影响, 利用X射线荧光光谱(X-ray fluorescence spectroscopy, XRF)、 X射线衍射(diffraction of X-ray,XRD)、 扫描电子显微镜(scanning electron microscope,SEM)、 偏光显微镜(polarizing microscope,PM)以及总有机碳分析仪(total organic carbon analyzer, TOC-L)等仪器对机制砂和石粉的矿物组成、 微观形貌和吸附特性进行分析; 开展花岗岩、 石灰岩2种类型砂制备混凝土及性能对比试验, 探讨花岗岩机制砂及其石粉含量对混凝土工作性能、 力学性能和干燥收缩性能的影响规律。 结果表明: 不同类型砂对混凝土工作性能影响明显, 控制混凝土的配合比与坍落度不变时, 花岗岩机制砂制备的混凝土减水剂掺量(配制混凝土时减水剂与胶凝材料的质量比)比石灰岩机制砂组的增加64.3%、 28 d抗压强度较石灰岩机制砂组的低15.2%、 120 d混凝土干燥收缩率较石灰岩机制砂组的增大7.6%; 花岗岩机制砂级配中石粉质量分数控制在3%～7%时, 混凝土的工作性能、 力学性能与干燥收缩性能均取得最优值。
关键词：花岗岩机制砂; 混凝土性能; 吸附性; 亚甲蓝值
Abstract：Granite manufactured sand used as concrete aggregate is one of the important ways to alleviate the shortage of river sand resources. In order to study the influence of high adsorption granite manufactured sand on concrete performance, the properties of granite powder were characterized by X-ray fluorescence spectroscopy (XRF), diffraction of X-ray(XRD), scanning electron microscopy (SEM), polarizing microscope(PM) and total organic carbon analyzer (TOC-L). Two different types of sand, granite manufactured sand, limestone manufactured sand and river sand, were carried out to prepare concrete and their performance comparison tests. The effects of granite manufactured sand and stone powder content on workability, mechanical properties and drying shrinkage properties of concrete were investigated. The results show that different types of sand have a significant impact on the workability of concrete, and when the mixture ratio and slump of concrete are the same, the dosage of water reducing agent(mass ratio of water reducing agent to cementing material when preparing concrete)of granite manufactured sand concrete increases by 64.3%, and the 28 d compressive strength decreases by 15.2%, and the dry shrinkage of concrete at 120 d increases by 7.6% compared with limestone manufactured sand group. The workability, compressive strength and dry shrinkage properties of concrete are optimized when the mass fraction of stone powder is controlled at 3%～7% in granite manufactured sand gradation.
Keywords：granite manufactured sand concrete; concrete performance; absorbability; methylene blue value
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