醋酸乙烯-乙烯改性抹灰砂浆早期干燥收缩分析

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (8): 2778-2787.

醋酸乙烯-乙烯改性抹灰砂浆早期干燥收缩分析

陈成文¹, 邵立荣¹, 王金光¹, 单俊伟^2,3, 景宏君^2,3, 郭美蓉^2,3, 叶万军²

1.西安建工第七建设集团有限公司,西安 710862;
2.西安科技大学建筑与土木工程学院,西安 710054;
3.西安科技大学道路工程研究中心,西安 710054

收稿日期:2024-01-04 修订日期:2024-03-11 出版日期:2024-08-15 发布日期:2024-08-12
通信作者: 景宏君,博士,教授。E-mail:jinghongjun@xust.edu.cn
作者简介:陈成文(1974—),男,高级工程师。主要从事聚合物改性水泥基材料的研究。E-mail:2289035644@qq.com
基金资助:
国家自然科学基金(42072319)

Early Drying Shrinkage Analysis of Vinyl Acetate-Ethylene Modified Plastering Mortar

CHEN Chengwen¹, SHAO Lirong¹, WANG Jinguang¹, SHAN Junwei^2,3, JING Hongjun^2,3, GUO Meirong^2,3, YE Wanjun²

1. Xi’an Construction Seventh Construction Group Co., Ltd., Xi’an 710862, China;
2. School of Civil and Architectural Engineering, Xi’an University of Science and Technology, Xi’an 710054, China;
3. Road Engineering Research Center, Xi’an University of Science and Technology, Xi’an 710054, China

Received:2024-01-04 Revised:2024-03-11 Online:2024-08-15 Published:2024-08-12

摘要/Abstract

摘要： 为缓解抹灰砂浆的早期干燥收缩,本文采用醋酸乙烯-乙烯(VAE)改性抹灰砂浆,通过正交试验探究了VAE、水胶比、粉煤灰、重钙对水泥砂浆早期干燥收缩的影响规律,采用灰色关联度分析了各因素对早期干燥收缩的影响程度,并采用核磁共振技术从细观尺度分析了VAE改性抹灰砂浆的孔隙结构分布。结果表明:各因素对砂浆早期干燥收缩影响程度由大到小依次为水胶比、VAE掺量、重钙掺量、粉煤灰掺量,并且最优组合为水胶比0.45、VAE掺量3%(质量分数,下同)、重钙掺量0%、粉煤灰掺量20%;VAE掺量在3%左右时,砂浆“三峰”峰值均有所降低,横向弛豫时间T₂谱积分面积最小,减少了有害孔和多害孔数量,此时砂浆孔结构分布均匀、形态复杂;VAE影响下砂浆的早期干燥收缩值与孔隙结构分形维数呈负相关函数,孔隙尺寸分布越均匀,形态越复杂,砂浆抵抗早期干燥收缩性能越强;实际工程中可以通过调节水胶比、VAE掺量控制砂浆的早期干燥收缩,通过调节粉煤灰、重钙掺量控制成本投入。

关键词: 醋酸乙烯-乙烯, 抹灰砂浆, 早期干燥收缩, 核磁共振技术, 孔隙结构, 分形维数

Abstract: To alleviate the early drying shrinkage of plastering mortar, vinyl acetate-ethylene (VAE) modified plastering mortar was used in this paper. The effects of VAE, water-binder ratio, fly ash and ground calcium carbonate on early drying shrinkage of cement mortar were discussed by orthogonal test. The influences of various factors on the early drying shrinkage were analyzed by grey correlation degree, and the pore structure distribution of VAE modified plastering mortar was analyzed by nuclear magnetic resonance. The results show that the influence degree of various factors on the early drying shrinkage of mortar in descending order is water-binder ratio, VAE content, ground calcium carbonate content and fly ash content, and the best combination is 0.45 water-binder ratio, 3% (mass fraction, the same below) VAE content, 0% ground calcium carbonate content and 20% fly ash content. When VAE content is about 3%, the peak value of ‘three peaks’ of mortar decreases, and the integral area of T₂ spectrum is the smallest, which mainly reduces the number of harmful holes and multi-harmful pores, and the distribution of mortar pore structure is uniform and the morphology is complex. Under the influence of VAE, the early drying shrinkage value of mortar has a negative correlation function with the fractal dimension of pore structure. The more uniform the pore size distribution is, the more complex the morphology is, the stronger the mortar resistance to early drying shrinkage is. In practical engineering, the early drying shrinkage of mortar can be controlled by water-binder ratio and VAE content, and the cost input can be controlled by fly ash and ground calcium carbonate content.

Key words: vinyl acetate-ethylene, plastering mortar, early drying shrinkage, nuclear magnetic resonance, pore structure, fractal dimension

中图分类号:

TQ177.62

陈成文, 邵立荣, 王金光, 单俊伟, 景宏君, 郭美蓉, 叶万军. 醋酸乙烯-乙烯改性抹灰砂浆早期干燥收缩分析[J]. 硅酸盐通报, 2024, 43(8): 2778-2787.

CHEN Chengwen, SHAO Lirong, WANG Jinguang, SHAN Junwei, JING Hongjun, GUO Meirong, YE Wanjun. Early Drying Shrinkage Analysis of Vinyl Acetate-Ethylene Modified Plastering Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2778-2787.

参考文献

[1] BEUSHAUSEN H, ARITO P. The influence of mix composition, W/B ratio and curing on restrained shrinkage cracking of cementitious mortars[J]. Construction and Building Materials, 2018, 174: 38-46.
[2] MAO Y G, LIU J H, SHI C J. Autogenous shrinkage and drying shrinkage of recycled aggregate concrete: a review[J]. Journal of Cleaner Production, 2021, 295: 126435.
[3] 王晓林, 冯红春, 周凯. VAE乳胶粉改性水泥砂浆的配合比优化及抗冻性研究[J]. 硅酸盐通报, 2023, 42(10): 3462-3469.
WANG X L, FENG H C, ZHOU K. Mix ratio optimization and frost resistance of VAE latex powder modified cement mortar[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(10): 3462-3469 (in Chinese).
[4] 王智鑫, 梅军鹏, 徐智东, 等. VAE改性砂浆自收缩与抗压强度相关性研究[J]. 混凝土, 2023(7): 140-144.
WANG Z X, MEI J P, XU Z D, et al. Study on the correlation between auto-shrinkage and compressive strength of VAE modified mortar[J]. Concrete, 2023(7): 140-144 (in Chinese).
[5] CHENG J J, SHI X, XU L L, et al. Investigation of the effects of styrene acrylate emulsion and vinyl acetate ethylene copolymer emulsion on the performance and microstructure of mortar[J]. Journal of Building Engineering, 2023, 75: 106965.
[6] YANG X J, LIU J S, LI H X, et al. Performance and ITZ of pervious concrete modified by vinyl acetate and ethylene copolymer dispersible powder[J]. Construction and Building Materials, 2020, 235: 117532.
[7] KIM. Influence of polymer types on the mechanical properties of polymer-modified cement mortars[J]. Applied Sciences, 2020, 10(3): 1061.
[8] 陈梅, 韩依璇, 张云升, 等. 掺花岗岩石粉砂浆自收缩性能演变规律研究[J]. 硅酸盐通报, 2023, 42(12): 4360-4367.
CHEN M, HAN Y X, ZHANG Y S, et al. Autogenous shrinkage performance evolution law of mortar mixed with granite powder[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(12): 4360-4367 (in Chinese).
[9] 杨医博, 梁宋梭, 刘福财, 等. 低吸水率陶瓷再生砂对砂浆力学和干燥收缩性能的影响及机理研究[J]. 硅酸盐通报, 2023, 42(9): 3277-3285.
YANG Y B, LIANG S S, LIU F C, et al. Effect and mechanism of low water absorption ceramic recycled sand on mechanical and drying shrinkage properties of mortar[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(9): 3277-3285 (in Chinese).
[10] 王将华, 薛翠真, 张宇, 等. 花岗岩石粉对砂浆干燥收缩性能的影响[J]. 材料导报, 2023, 37(22): 107-112.
WANG J H, XUE C Z, ZHANG Y, et al. Effect of granite powder on drying shrinkage[J]. Materials Reports, 2023, 37(22): 107-112 (in Chinese).
[11] 周至阳, 梅军鹏, 李海南, 等. 聚甲醛纤维增强砂浆的力学性能和干燥收缩试验研究[J]. 硅酸盐通报, 2022, 41(10): 3386-3393.
ZHOU Z Y, MEI J P, LI H N, et al. Mechanical properties and drying shrinkage of polyoxymethylene fiber reinforced mortar[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(10): 3386-3393 (in Chinese).
[12] 中华人民共和国住房和城乡建设部. 建筑砂浆基本性能试验方法标准: JGJ/T 70—2009[S]. 北京: 中国建筑工业出版社, 2009.
Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Standard test method for basic properties of building mortar: JGJ/T 70—2009[S]. Beijing: China Construction Industry Publishing House, 2009 (in Chinese).
[13] DONG E L, YU R, FAN D Q, et al. Absorption-desorption process of internal curing water in ultra-high performance concrete (UHPC) incorporating pumice: from relaxation theory to dynamic migration model[J]. Cement and Concrete Composites, 2022, 133: 104659.
[14] FRIEDEMANN K, STALLMACH F, KÄRGER J. NMR diffusion and relaxation studies during cement hydration: a non-destructive approach for clarification of the mechanism of internal post curing of cementitious materials[J]. Cement and Concrete Research, 2006, 36(5): 817-826.
[15] 刘倩, 申向东, 董瑞鑫, 等. 孔隙结构对风积沙混凝土抗压强度影响规律的灰熵分析[J]. 农业工程学报, 2019, 35(10): 108-114.
LIU Q, SHEN X D, DONG R X, et al. Grey entropy analysis on effect of pore structure on compressive strength of aeolian sand concrete[J]. Transactions of the Chinese Society of Agricultural Engineering, 2019, 35(10): 108-114 (in Chinese).
[16] 李温, 王海龙, 张佳豪, 等. 胶粉煤矸石混凝土力学特性及微观结构试验研究[J]. 排灌机械工程学报, 2023, 41(2): 139-145.
LI W, WANG H L, ZHANG J H, et al. Experimental study on mechanical properties and microstructure of powdered coal gangue concrete[J]. Journal of Drainage and Irrigation Machinery Engineering, 2023, 41(2): 139-145 (in Chinese).
[17] 王培铭, 赵国荣, 张国防. 可再分散乳胶粉在水泥砂浆中的作用机理[J]. 硅酸盐学报, 2018, 46(2): 256-262.
WANG P M, ZHAO G R, ZHANG G F. Mechanism of redispersible polymer powder in cement mortar[J]. Journal of the Chinese Ceramic Society, 2018, 46(2): 256-262 (in Chinese).
[18] ANTONI, CHANDRA L, HARDJITO D. The impact of using fly ash, silica fume and calcium carbonate on the workability and compressive strength of mortar[J]. Procedia Engineering, 2015, 125: 773-779.
[19] BARNAT-HUNEK D, GRZEGORCZYK-FRAŃCZAK M, KLIMEK B, et al. Properties of multi-layer renders with fly ash and boiler slag admixtures for salt-laden masonry[J]. Construction and Building Materials, 2021, 278: 122366.
[20] LÜ Q, QIU Q L, ZHENG J, et al. Fractal dimension of concrete incorporating silica fume and its correlations to pore structure, strength and permeability[J]. Construction and Building Materials, 2019, 228: 116986.
[21] 高嵩, 李秋义, 李楠, 等. 基于最紧密堆积理论超密实再生砂浆制备研究[J]. 建筑结构学报, 2021, 42(增刊1): 466-472.
GAO S, LI Q Y, LI N, et al. Research on super dense recycled mortar preparation based on densified parking theory[J]. Journal of Building Structures, 2021, 42(supplement 1): 466-472 (in Chinese).
[22] 田浩正, 乔宏霞, 冯琼, 等. 石粉替代率对聚合物机制砂粘结砂浆性能及微细观结构的影响研究[J]. 材料导报, 2023, 38(6): 138-144.
TIAN H Z, QIAO H X, FENG Q, et al. Study on the effect of stone powder substitution rate on the performance and microstructure of sand mortar[J]. Materials Reports, 2023, 38(6): 138-144 (in Chinese).
[23] 郭磊, 张忆庆, 田文峰. 基于污泥的多元固废体系混凝土性能研究[J/OL]. 土木工程学报, 1-12[2023-12-20][2023-12-31]. https://doi.org/10.15951/j.tmgcxb.23080678.
GUO L, ZHANG Y Q, TIAN W F. Research on concrete performance of multiple solid waste system based on sludge[J/OL]. China Civil Engineering Journal, 1-12[2023-12-20][2023-12-31]. https://doi.org/10.15951/j.tmgcxb.23080678 (in Chinese).