膨胀剂和高吸水树脂组合对混凝土收缩的影响

李威; 韩宇栋; 岳清瑞; 丁小平; 孟兮; 党玉栋

doi:10.13204/j.gyjzG22071808

膨胀剂和高吸水树脂组合对混凝土收缩的影响

doi: 10.13204/j.gyjzG22071808

1. 中冶建筑研究总院有限公司, 北京 100088;
2. 北京科技大学, 城镇化与城市安全研究院, 北京 100083;
3. 云南省建筑科学研究院有限公司, 昆明 650223

基金项目:

国家自然科学基金项目（52178263）；北京市科技新星计划（Z201100006820024）；中冶建筑研究总院有限公司重大课题（YCK2017Ky01）。

详细信息

作者简介:
李威,男,1997年出生,硕士。

通讯作者:
韩宇栋,博士,高级工程师,hanyudong@cribc.com。

计量
- 文章访问数: 31
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- 被引次数: 0
出版历程
- 收稿日期: 2022-07-18
- 网络出版日期: 2023-03-22

Influence of Combined Expansive Agent and Internal Curing Water of Super Absorbent Polymer on Concrete Shrinkage

1. Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing 100088, China;
2. Research Institute of Urbanization and Urban Safety, University of Science and Technology Beijing, Beijing 100083, China;
3. Yunnan Institute of Building Research Co., Ltd., Kunming 650223, China

摘要

摘要: 为调控混凝土早期收缩开裂，探究膨胀剂和高吸水树脂内养护剂组合对混凝土早期收缩的调控规律及对力学强度的影响，本研究以膨胀剂和内养护水均占胶凝材料总质量的0、3%、6%、9%组合掺入的混凝土作为对象，测试了早期自由变形、抗压和劈裂抗拉强度以及干燥失水率。结果表明：随着膨胀剂和内养护水组合掺量的增加，前3 d龄期内的混凝土自由变形曲线由"W "型逐渐向" L"型演变，混凝土28 d内自收缩和干燥收缩均被调控下降，直至掺量9%组密封养护下产生1 310×10^-6的明显膨胀；但各组的净干燥收缩仍不能根除，同时28 d龄期的力学强度逐渐降低。混凝土3~28 d内净干燥收缩和干燥失水率基本呈线性相关。基于试验结果，确定6%组合掺量在本研究中相对较优。
- 混凝土 /
- 收缩 /
- 膨胀剂 /
- 内养护 /
- 高吸水树脂 /
- 组合调控
Abstract: In order to regulate the early shrinkage and cracking of the concrete, the influence of combined expansive agent and internal curing water of super absorbent polymer (SAP) on the regulation laws of early shrinkage and mechanical strength of concrete were investigated in this study. Specifically, this study analyzed the concrete in which the expansive agent and internal curing water with a combined dosage accounting for 0%, 3%, 6%, and 9% of the total mass of the binding material are added. In addition, the study tested the early free deformation, compressive strength, splitting tensile strength, and drying-induced water loss rate. The results show that as the combined dosage of the expansive agent and internal curing water increases, the free deformation curve of concrete in the first three days gradually evolves from W-shaped to L-shaped, and the concrete autogenous and drying shrinkage decreases gradually in 28 days until an expansion up to 1 310×10^-6 is noticed in the group with a combined dosage of 9% under sealed curing condition. However, the net drying shrinkage of all groups cannot be eliminated, and the mechanical strength of the concrete decreases gradually in 28 days. Furthermore, the drying-induced water loss rate is linearly correlated to the net drying shrinkage of concrete from three days to 28 days. According to experimental results, the group with a combined dosage of 6% is optimal in this study.
- concrete /
- shrinkage /
- expansive agent /
- internal curing /
- SAP /
- combined control

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参考文献(26)

[1]	BENTUR A. Evaluation of early age cracking characteristics in cementitious systems[J]. Materials and Structures, 2003,36(3):183-190.
[2]	WEI Y, HANSEN W. Characterizing cracking potential of cementitious mixtures based on shrinkage and humidity drop rate[J]. ACI Materials Journal, 2013,110(4):433-440.
[3]	韩宇栋, 张君, 王家赫, 等. 基于粗骨料含量的混凝土早龄期收缩调控[J]. 混凝土, 2017(1):56-62.
[4]	余军波,吴建兵,周珂,等. 基于代表性体积单元模型的掺硫铝酸钙类膨胀剂水泥浆力学特性研究[J].工业建筑,2022,52(增刊):381-387.
[5]	李书进,徐肖雨,厉见芬,等. 无收缩自密实混凝土的制备及应用研究[J].工业建筑,2014,44(12):109-112.
[6]	丁小平,韩宇栋,张君,等. 混凝土收缩调控评述-单因素调控法[J]. 防护工程,2021,43(3):1-12.
[7]	王立成,张磊. 混凝土内养护技术研究进展[J]. 建筑材料学报, 2020, 23(6):1471-1478.
[8]	丁小平, 张君,韩宇栋,等. 考虑内养护剂释水的混凝土自干燥计算模型[J]. 建筑材料学报, 2022,25(3):242-247.
[9]	张高展, 王宇譞, 葛竞成, 等. 轻集料对超高性能混凝土工作和力学性能的影响[J]. 建筑材料学报, 2021, 24(3):499-507.
[10]	ZHAO H T, JIANG K D, YANG R, et al. Experimental and theoretical analysis on coupled effect of hydration, temperature and humidity in early-age cement-based materials[J]. International Journal of Heat and Mass Transfer, 2020,146.
[11]	PHILLEO R. Concrete science and reality[C]//J.P.Skalng,S.Mindess(Eds).Materials Science of Concrete II. Amerian Ceramic Society,1991:1-8.
[12]	JENSEN O M, HASEN P F. Water-entrained cement-based materials II. experimental observations[J]. Cement and Concrete Research, 2002, 32(6):973-978.
[13]	ZHANG J, HAN Y D, GAO Y, et al. Integrative study on the effect of internal curing on autogenous and drying shrinkage of high-strength concrete[J]. Drying Technology, 2013, 31(5):565-575.
[14]	韩松,安明喆,郭瑞,等.陶粒内养护高性能混凝土抗裂性能研究[J].建筑材料学报,2015,18(5):742-748.
[15]	胡玉庆,郭保林,张敦福,等. 不同养护条件下内养护补偿收缩砂浆性能研究[J]. 硅酸盐通报,2018,37(2):377-382.
[16]	陈伟,钱觉时,何兵,等. 膨胀剂与陶砂对低水灰比砂浆的减缩作用[J].硅酸盐学报,2013,41(4):505-510.
[17]	刘家彬,张明亮,秦鸿根,等.轻砂内养护剂的协同膨胀效应对微膨胀混凝土变形性能的影响[J]. 湖南大学学报(自然科学版),2022,49(3):196-202.
[18]	ZHANG J, HOU D W, HAN Y D. Micromechanical modeling on autogenous and drying shrinkages of concrete[J]. Construction and Building Materials, 2012, 29(3):230-240.
[19]	SCRIVENER K L. Hydration, microstructure and modeling of cementitious materials. Part 1:Hydration and Microstructure Development[R]. Beijing:Seminar Tsinghua University, 2010:56-74.
[20]	王栋民, 陈华辉, 欧阳世翕. 高强流态膨胀混凝土力学性能和膨胀行为[J]. 硅酸盐学报, 2004, 32(4):454-459.
[21]	张涛. 混凝土早龄期开裂敏感性的影响因素研究[D]. 北京:清华大学, 2006:44.
[22]	ZHANG J, HAN Y D, GAO Y. Effects of water-binder ratio and coarse aggregate content on interior humidity, autogenous shrinkage, and drying shrinkage of concrete[J]. Journal of materials in Civil Engineers, 2014, 26(1):184-189.
[23]	郑小波, 吴德芬, 何文, 等. 内养护混凝土不同养护方式下的减缩效果及强度发展[J]. 混凝土, 2015(7):52-57.
[24]	孔祥明,张珍林. 高吸水性树脂对高强混凝土浆体孔结构的影响[J]. 硅酸盐学报,2013,41(11):1474-1480.
[25]	BENTZ D P. Internal curing of high-performance blended cement mortars[J]. ACI Materials Journal,2007,104(4):408-414.
[26]	汪洋,王育江,李华. 膨胀混凝土早龄期变形及力学性能试验研究[J]. 新型建筑材料,2022,49(6):86-90. 2209000020802727李孝忠.fbd