[1]何小兵,沈武福,贾秋炳,等.砂浆流变特性及其膜厚对自密实混凝土性能的影响[J].东南大学学报(自然科学版),2020,50(3):463-470.[doi:10.3969/j.issn.1001-0505.2020.03.008]
 He Xiaobing,Shen Wufu,Jia Qiubing,et al.Effects of mortar rheological characteristics and film thickness on self-compacting concrete[J].Journal of Southeast University (Natural Science Edition),2020,50(3):463-470.[doi:10.3969/j.issn.1001-0505.2020.03.008]
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砂浆流变特性及其膜厚对自密实混凝土性能的影响()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
50
期数:
2020年第3期
页码:
463-470
栏目:
材料科学与工程
出版日期:
2020-05-20

文章信息/Info

Title:
Effects of mortar rheological characteristics and film thickness on self-compacting concrete
作者:
何小兵1沈武福1贾秋炳1刘亚2
1重庆交通大学省部共建山区桥梁及隧道工程国家重点实验室, 重庆 400074; 2杭州市交通规划设计研究院, 杭州 310000
Author(s):
He Xiaobing1 Shen Wufu1 Jia Qiubing1 Liu Ya2
1State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2Hangzhou Institute of Communications Planning Design and Research, Hangzhou 310000, China
关键词:
自密实混凝土 砂浆膜厚 筛出砂浆 流变参数 坍落扩展度 抗压强度
Keywords:
self-compacting concrete mortar film thickness sieved mortar rheological parameter slump flow comprehensive strength
分类号:
TU599
DOI:
10.3969/j.issn.1001-0505.2020.03.008
摘要:
将新拌自密实混凝土(self-compacting concrete,SCC)视作砂浆和粗骨料两相悬浮体系,研究砂浆流变特性以及砂浆膜厚(粗骨料的理论计算裹浆厚度)对SCC性能的影响.设计不同强度等级的SCC配合质量比,采用旋转流变仪优化SCC砂浆中粉煤灰质量分数和砂的体积分数,通过改变SCC中粗骨料体积分数设计不同砂浆膜厚混凝土配合质量比,测试不同砂浆膜厚下新拌混凝土筛出砂浆(新拌自密实混凝土通过5 mm标准筛后自由流出的砂浆)的流变特性、工作性以及其硬化混凝土的抗压强度.结果表明,基于SCC砂浆流变参数进行砂浆组分优化得到的粉煤灰取代质量分数范围为25%~35%,砂的体积分数范围为0.40~0.42;当砂浆膜厚大于2.1 mm后,新拌混凝土的工作性满足SCC要求,筛出砂浆流变参数和硬化混凝土抗压强度趋于稳定,新拌混凝土坍落扩展度与其砂浆屈服剪切应力和密度相关,并给出了预测公式.
Abstract:
Considering fresh self-compacting concrete(SCC)as a two-phase suspension system of mortar and coarse aggregate, the influence of mortar rheological properties and the film thickness on the performance of SCC were studied. Based on the reference SCC mix ratios of different strength grades, the rotational rheometer was used to optimize fly-ash content(by mass)and sand volume fraction of the mortar derived from the reference SCC, then concrete mixtures with different mortar film thicknesses by changing the volume fraction of the coarse aggregate in the reference SCC mixes were designed to obtain the variation laws with mortar film thickness(MFT), rheological properties of the sieved mortar from the mixtures, workability of the mixtures and the compressive strength of the hardened concrete. The research results show that the optimization substitution ratio of fly ash for cement ranges from 25% to 35% based on the rheological parameters of the mortar from SCC, and the sand volume fraction is in the range of 0.40 to 0.42; when MFT is more than 2.1 mm, the workability of the mixtures meets SCC requirements, the rheological parameters of the sieved mortar and the compressive strength of the concrete tend to be stable, and finally the empirical formula for predicting slump flow of fresh SCC is obtained, which is the function of mortar yield shear stress and the mixture density.

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备注/Memo

备注/Memo:
收稿日期: 2019-10-22.
作者简介: 何小兵(1978—),男,博士,教授,david.hxb@gmail.com.
基金项目: 国家自然科学基金资助项目(51408091)、中国博士后基金资助项目(2015M572641XB)、重庆市基础研究与前沿探索面上资助项目(cstc2019jcyj-msxm2173)、重庆市教委科学技术研究资助项目(KJ1500512)、山区桥梁与隧道国家省部共建重点实验室开放基金资助项目(CQSLBF-2015-12).
引用本文: 何小兵,沈武福,贾秋炳,等.砂浆流变特性及其膜厚对自密实混凝土性能的影响[J].东南大学学报(自然科学版),2020,50(3):463-470. DOI:10.3969/j.issn.1001-0505.2020.03.008.
更新日期/Last Update: 2020-05-20