聚甲醛纤维增强砂浆的力学性能和干燥收缩试验研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (10): 3386-3393.

聚甲醛纤维增强砂浆的力学性能和干燥收缩试验研究

周至阳¹, 梅军鹏^1,2, 李海南³, 廖宜顺^1,2, 徐智东¹, 牛寅龙⁴, 李雨浓³

1.武汉科技大学城市建设学院,武汉 430065;
2.武汉科技大学高性能工程结构研究院,武汉 430065;
3.武汉纺织大学工程造价系,武汉 430200;
4.中建三局第一建设工程有限责任公司,武汉 430040

收稿日期:2022-06-13 修回日期:2022-08-23 出版日期:2022-10-15 发布日期:2022-10-26
通讯作者: 梅军鹏,博士,副教授。E-mail:meijunpeng2006@126.com
作者简介:周至阳(1997—),男,硕士研究生。主要从事纤维增强水泥基复合材料的研究。E-mail:zhouzy2020@163.com
基金资助:
国家自然科学基金(51908434);湖北省教育厅科学技术研究计划(Q20191706)

Mechanical Properties and Drying Shrinkage of Polyoxymethylene Fiber Reinforced Mortar

ZHOU Zhiyang¹, MEI Junpeng^1,2, LI Hainan³, LIAO Yishun^1,2, XU Zhidong¹, NIU Yinlong⁴, LI Yunong³

1. School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China;
2. Institute of High Performance Engineering Structure, Wuhan University of Science and Technology, Wuhan 430065, China;
3. Department of Construction Cost, Wuhan Textile University, Wuhan 430200, China;
4. China Construction Third Bureau First Engineering Co., Ltd., Wuhan 430040, China

Received:2022-06-13 Revised:2022-08-23 Online:2022-10-15 Published:2022-10-26

摘要/Abstract

摘要： 本文研究了不同长度聚甲醛(POM)纤维单掺和混掺对砂浆流动度、抗折强度、抗压强度、弯曲韧性及干燥收缩的影响,并通过扫描电镜观测了其微观结构。研究发现,砂浆流动度随POM纤维长度和掺量增大而下降,混掺纤维比单掺对砂浆流动度的影响更小。POM纤维能有效提高砂浆的抗折强度,但掺量超过0.6%(体积分数,下同)时增强效果减弱,与未掺纤维试样相比,0.6%掺量的6 mm纤维对试样28 d抗折强度提升最高,为14.67%,抗压强度随纤维掺量增加而降低。12 mm纤维比6 mm及混掺对试样弯曲韧性提升更明显,最大提高49.43%。纤维的掺入可显著降低试样的干燥收缩率,且随纤维掺量增加,试样90 d干燥收缩率先减小后增大。与未掺纤维试样相比,0.6%掺量的6 mm纤维试样90 d干燥收缩率下降最多,为27.39%。混掺POM纤维在掺量0.6%以上时仍可显著提升砂浆的抗折强度并减小干燥收缩率。

关键词: 水泥砂浆, 聚甲醛纤维, 流动度, 力学性能, 弯曲韧性, 干燥收缩

Abstract: The effects of single adding and mixing polyoxymethylene (POM) fibers with different lengths on fluidity, flexural strength, compressive strength, flexural toughness and drying shrinkage of mortar were studied in this paper, and the microstructure of mortar was observed by scanning electron microscope. The results show that mortar fluidity decreases with the increase of POM fiber length and content, and the influence of mixed fiber with different lengths on the fluidity of mortar is less than that of single fiber. POM fiber effectively enhances the flexural strength of mortar, but the strengthening effect is weakened when the content is more than 0.6% (volume fraction, the same below). Compared with the sample without fiber, the 6 mm fiber with 0.6% content has the highest increase of 28 d flexural strength, which is 14.67%. The compressive strength decreases with the increase of fiber content. The flexural toughness of 12 mm fiber is improved more significantly than that of 6 mm fiber and mixed fiber, which increases of 49.43% at most compared with the sample without fiber. The addition of fiber greatly reduces the drying shrinkage of the sample, the 90 d drying shrinkage of the sample decreases first and then increases with the increase of fiber content. Compared with the sample without fiber, the 90 d drying shrinkage rate of 6 mm fiber sample with 0.6% content decreases the most, which is 27.39%. The hybrid POM fiber still significantly improves the flexural strength and reduces the drying shrinkage when the content is more than 0.6%.

Key words: cement mortar, polyoxymethylene fiber, fluidity, mechanical property, bending toughness, drying shrinkage

中图分类号:

TU528

周至阳, 梅军鹏, 李海南, 廖宜顺, 徐智东, 牛寅龙, 李雨浓. 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 Zhiyang, MEI Junpeng, LI Hainan, LIAO Yishun, XU Zhidong, NIU Yinlong, LI Yunong. Mechanical Properties and Drying Shrinkage of Polyoxymethylene Fiber Reinforced Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(10): 3386-3393.

参考文献

[1] 丁点点.耐碱性玻璃纤维增强混凝土的制备及力学性能研究[J].功能材料,2019,50(10):10168-10172.
DING D D. Preparation and mechanical properties of alkali-resistant glass fiber reinforced concrete[J]. Journal of Functional Materials, 2019, 50(10): 10168-10172 (in Chinese).
[2] LIU H, WANG J Z, JIANG P F, et al. Durability of fiber-reinforced polyoxymethylene composites under the high hydrostatic pressure in the deep sea[J]. Journal of Applied Polymer Science, 2020, 137(20): 48686.
[3] 吕锦飞.聚甲醛纤维混凝土性能研究[D].扬州:扬州大学,2019.
LYU J F. Study on properties of POM fiber reinforced concrete[D]. Yangzhou: Yangzhou University, 2019 (in Chinese).
[4] 田国峰,李建华,战佳宇,等.聚甲醛纤维对砂浆性能的影响研究[J].混凝土与水泥制品,2017(7):51-54.
TIAN G F, LI J H, ZHAN J Y, et al. Influence research of polyoxymethylene (POM) fiber on properties of mortar[J]. China Concrete and Cement Products, 2017(7): 51-54 (in Chinese).
[5] 张丽辉,周华新,刘建忠,等.聚甲醛纤维增强砂浆塑性抗开裂性能的研究[J].新型建筑材料,2018,45(6):48-52.
ZHANG L H, ZHOU H X, LIU J Z, et al. Research on anti-plastic cracking property of polyoxymethylene fiber-reinforced cement mortar[J]. New Building Materials, 2018, 45(6): 48-52 (in Chinese).
[6] FERRARA L, PARK Y D, SHAH S P. A method for mix-design of fiber-reinforced self-compacting concrete[J]. Cement and Concrete Research, 2007, 37(6): 957-971.
[7] 阳知乾,张倩倩,刘建忠,等.合成纤维特征参数对砂浆流变行为的影响[J].河北工业大学学报,2014,43(6):109-112.
YANG Z Q, ZHANG Q Q, LIU J Z, et al. Effect of characteristic parameters of synthetic fibers on the rheological behavior of mortar[J]. Journal of Hebei University of Technology, 2014, 43(6): 109-112 (in Chinese).
[8] 张兰芳,梁秋爽,尹玉龙.玄武岩纤维对碱矿渣水泥砂浆性能的影响[J].混凝土,2015(10):124-127.
ZHANG L F, LIANG Q S, YIN Y L. Effect of basalt fibers on the properties of alkali-activated slag cement mortar[J]. Concrete, 2015(10): 124-127 (in Chinese).
[9] 梅军鹏.基于纳微米改性的混凝土表面防护材料研究[D].武汉:武汉理工大学,2018.
MEI J P. Study on concrete surface protection materials modified by nano/micro particles[D]. Wuhan: Wuhan University of Technology, 2018 (in Chinese).
[10] 宣卫红,赵晖,陈育志,等.聚丙烯纤维的长度对新拌砂浆工作性能的影响及其机理分析[J].混凝土,2011(12):110-112.
XUAN W H, ZHAO H, CHEN Y Z, et al. Effect of length of polypropylene fiber on working properties of fresh mortar and mechanism analysis[J]. Concrete, 2011(12): 110-112 (in Chinese).
[11] DEY V, KACHALA R, BONAKDAR A, et al. Mechanical properties of micro and sub-micron wollastonite fibers in cementitious composites[J]. Construction and Building Materials, 2015, 82: 351-359.
[12] NATALI A, MANZI S, BIGNOZZI M C. Novel fiber-reinforced composite materials based on sustainable geopolymer matrix[J]. Procedia Engineering, 2011, 21: 1124-1131.
[13] RASHAD A M. A comprehensive overview about the influence of different additives on the properties of alkali-activated slag: a guide for civil engineer[J]. Construction and Building Materials, 2013, 47: 29-55.
[14] 吴启一,姚华彦,扈惠敏,等.玄武岩纤维对水泥稳定多孔玄武岩碎石力学性能的影响[J].硅酸盐通报,2022,41(1):192-198.
WU Q Y, YAO H Y, HU H M, et al. Effect of basalt fiber on mechanical properties of cement stabilized porous basalt macadam[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(1): 192-198 (in Chinese).
[15] 张丽辉,刘建忠,周华新,等.聚甲醛纤维对混凝土性能的影响[J].混凝土与水泥制品,2018(1):58-62.
ZHANG L H, LIU J Z, ZHOU H X, et al. Effects of polyoxymethylene fiber on properties of concrete[J]. China Concrete and Cement Products, 2018(1): 58-62 (in Chinese).
[16] 刘高鹏,廖宜顺,刘立军,等.苎麻纤维水泥基材料的力学性能与自收缩试验研究[J].功能材料,2019,50(7):7176-7181.
LIU G P, LIAO Y S, LIU L J, et al. Experimental study on mechanical properties and autogenous shrinkage of cement-based materials with ramie fiber[J]. Journal of Functional Materials, 2019, 50(7): 7176-7181 (in Chinese).
[17] 牛恒茂,武文红,米力.纤维水泥基材料中纤维分布均匀程度与弯曲性能关系的研究[J].硅酸盐通报,2015,34(2):325-330.
NIU H M, WU W H, MI L. Research on the relation between fiber distribution uniformity degree and bending properties of polyvinyl alcohol(PVA) fiber reinforced cementitious composites[J]. Bulletin of the Chinese Ceramic Society, 2015, 34(2): 325-330 (in Chinese).
[18] TONG Y P, ZHAO S B, MA J T, et al. Improving cracking and drying shrinkage properties of cement mortar by adding chemically treated luffa fibres[J]. Construction and Building Materials, 2014, 71: 327-333.
[19] 吴志涛,张云升,刘乃东,等.玻璃纤维增强水泥基材料收缩性能研究[J].硅酸盐通报,2019,38(8):2570-2577.
WU Z T, ZHANG Y S, LIU N D, et al. Shrinkage properties of glass fiber reinforced cement-based materials[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(8): 2570-2577 (in Chinese).
[20] 牛恒茂,武文红,赵燕茹,等.基于PVA纤维-基体界面性能分析水泥基材料的弯曲性能[J].材料导报,2018,32(6):995-999+1009.
NIU H M, WU W H, ZHAO Y R, et al. Analysis on bending properties of PVA fiber reinforced cementitious composites based on PVA fiber-matrix interface property[J]. Materials Review, 2018, 32(6): 995-999+1009 (in Chinese).
[21] 张秀芝,孙伟,张倩倩,等.混杂钢纤维增强超高性能水泥基材料力学性能分析[J].东南大学学报(自然科学版),2008,38(1):156-161.
ZHANG X Z, SUN W, ZHANG Q Q, et al. Mechanical behaviors of hybrid steel fiber reinforced ultra-high performance cementitious composites[J]. Journal of Southeast University (Natural Science Edition), 2008, 38(1): 156-161 (in Chinese).
[22] 吴科如,李淑进.混杂钢纤维水泥基材料的力学行为[J].同济大学学报(自然科学版),2006,34(8):1075-1078.
WU K R, LI S J. Mechanical behaviors of hybrid steel fiber reinforced cementitious composites[J]. Journal of Tongji University (Natural Science), 2006, 34(8): 1075-1078 (in Chinese).