膨胀剂和减缩剂对预制箱梁混凝土的防裂效果研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (3): 801-811.

膨胀剂和减缩剂对预制箱梁混凝土的防裂效果研究

张丰^1,2, 白银^1,2, 张金康³, 祝烨然^1,4, 宁逢伟^1,2, 吕乐乐^1,2, 胡海明^1,4

1.南京水利科学研究院,南京 210029;
2.水文水资源与水利工程科学国家重点实验室,南京 210029;
3.南京市公路事业发展中心,南京 252000;
4.南京瑞迪高新技术有限公司,南京 210024

收稿日期:2020-10-30 修回日期:2020-12-30 出版日期:2021-03-15 发布日期:2021-04-13
作者简介:张丰(1989—),男,博士,工程师。主要从事水工材料及混凝土耐久性的研究。E-mail:fzhang@nhri.cn
基金资助:
国家重点研发计划(2018YFC0406702);南京市交通科技项目(G312NJ-KTYJ7);中央级公益性科研院所基本科研业务费专项(Y419004)

Anti-Cracking Effects of Expansion Agent and Shrinkage-Reducing Agent on Precast Box Girder Concrete

ZHANG Feng^1,2, BAI Yin^1,2, ZHANG Jinkang³, ZHU Yeran^1,4, NING Fengwei^1,2, LYU Lele^1,2, HU Haiming^1,4

1. Nanjing Hydraulic Research Institute, Nanjing 210029, China;
2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210029, China;
3. Nanjing Highway Development Center, Nanjing 252000, China;
4. Nanjing R&D Hi-Tech Co., Ltd., Nanjing 210024, China

Received:2020-10-30 Revised:2020-12-30 Online:2021-03-15 Published:2021-04-13

摘要/Abstract

摘要： 测试C50箱梁混凝土的力学、抗裂、变形、热学性能,采用B4Cast软件仿真分析构件混凝土的温度、应力发展规律和开裂趋势,并研究膨胀剂、减缩剂对箱梁混凝土的防裂效果。结果表明:C50箱梁混凝土抗裂性较差,早期平板总开裂面积达310 mm²/m²,圆环开裂时间约为52 h;箱梁混凝土与外部环境最大温差为16~18 ℃,在翼板两侧和底板两侧拐角处混凝土表层拉应力达到最大,分别约为0.8 MPa、0.9 MPa。膨胀剂、减缩剂对C50混凝土拌合物工作性、力学性能、热学性能影响不大,仅单掺减缩剂会使混凝土力学性能略有降低。膨胀剂、减缩剂的掺入,可降低C50混凝土平板总开裂面积68%~95%,延后圆环开裂时间105.5~227.5 h;可使自生体积收缩变形减小63%~78%,干缩减小38%。膨胀剂与减缩剂复掺,可削减箱梁混凝土温峰达4 ℃,降低最大拉应力52%,混凝土抗裂安全系数可达3.05,开裂风险明显下降。

关键词: 箱梁, 膨胀剂, 减缩剂, 防裂, 仿真分析, 抗裂安全系数

Abstract: On the basis of testing the mechanical, crack resistance, deformation and thermal properties of box girder concrete (C50), B4Cast software was used to simulate and analyze the temperature, stress development law and cracking trend of concrete, and the anti-cracking effects of expansion agent and shrinkage-reducing agent on the box girder concrete were also studied. The results show that, the box girder concrete (C50) has poor crack resistance, and the total cracking area of the early slab is 310 mm²/m², and the crack time of ring is about 52 h. The maximum temperature difference between the box girder concrete and the external environment is 16 ℃ to 18 ℃, and the tensile stress of concrete surface layer reaches the maximum at both sides of the wing or the corner of bottom plate, which is about 0.8 MPa and 0.9 MPa. The addition of expansion agent or shrinkage-reducing agent has little effect on the workability, mechanical properties and thermal properties of C50 concrete. The mechanical properties of C50 concrete are slightly reduced by only adding shrinkage-reducing agent. The incorporation of expansion agent and shrinkage-reducing agent reduces the total cracking area of slab by 68% to 95% and delay the cracking time of ring by 105.5 h to 227.5 h. The combined mixing of expansion agent and shrinkage reducing agent reduces the shrinkage deformation of concrete by 63% to 78% and dry shrinkage by 38%. With the addition of expansion agent and shrinkage-reducing agent, the temperature peak of box girder concrete structure is reduced by 4 ℃, the maximum tensile stress is reduced by 52%, and the anti-cracking safety factor of concrete reaches 3.05, which significantly reduces the risk of cracking.

Key words: box girder, expansion agent, shrinkage-reducing agent, anti-cracking, simulation analysis, anti-cracking safety factor

中图分类号:

TV42

张丰, 白银, 张金康, 祝烨然, 宁逢伟, 吕乐乐, 胡海明. 膨胀剂和减缩剂对预制箱梁混凝土的防裂效果研究[J]. 硅酸盐通报, 2021, 40(3): 801-811.

ZHANG Feng, BAI Yin, ZHANG Jinkang, ZHU Yeran, NING Fengwei, LYU Lele, HU Haiming. Anti-Cracking Effects of Expansion Agent and Shrinkage-Reducing Agent on Precast Box Girder Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 801-811.

参考文献

[1] 王铁梦.工程结构裂缝控制[M].北京:中国建筑工业出版社,1997.
WANG T M. Engineering structure crack control[M]. Beijing: China Building Industry Press, 1997 (in Chinese).
[2] 黄士元.混凝土早期裂纹的成因及防治[J].混凝土,2000(7):3-6.
HUANG S Y. The causes and preventions of concrete early cracking[J]. Concrete, 2000(7): 3-6 (in Chinese).
[3] 张雄.混凝土结构裂缝防治技术[M].北京:化学工业出版社,2007.
ZHANG X, ZHANG X W, LI X F. Prevention and cure technology of concrete structure crack[M]. Beijing: Chemical Industry Press, 2007 (in Chinese).
[4] 覃维祖.混凝土的收缩、开裂及其评价与防治[J].混凝土,2001(7):3-7.
QIN W Z. Shrinkage and cracking of concrete and its evaluation and prevention[J]. Concrete, 2001(7): 3-7 (in Chinese).
[5] 郑秀梅,农国才,张皓.减缩剂与膨胀剂对UHPC收缩性能影响研究[J].混凝土,2017(9):76-79.
ZHENG X M, NONG G C, ZHANG H. Research on influence of shrinkage-reducing agent and expansive agent for shrinkage performance of UHPC[J]. Concrete, 2017(9): 76-79 (in Chinese).
[6] SHAH S P, KARAGULER M E, SARIGAPHUTI M. Effects of shrinkage-reducing admixtures on restrained shrinkage cracking of concrete[J]. ACI Materials Journal, 1992, 89(3): 289-295.
[7] 邵正明,张超,仲晓林,等.国外减缩剂技术的发展与应用[J].混凝土,2000(10):60-63.
SHAO Z M, ZHANG C, ZHONG X L, et al. Development and applications of shrinkage reducing agents overseas[J]. Concrete, 2000(10): 60-63 (in Chinese).
[8] 卞荣兵,马存前,刘姝,等.新型混凝土减缩剂评价研究[J].建筑材料学报,2005,8(4):436-439.
BIAN R B, MA C Q, LIU S, et al. Evaluation of the shrinkage reducing admixture for concrete[J]. Journal of Building Materials, 2005, 8(4): 436-439 (in Chinese).
[9] 邵正明,张超,仲晓林,等.JSJ减缩剂的性能研究与工程应用[J].混凝土,2003(4):53-55+57.
SHAO Z M, ZHANG C, ZHONG X L, et al. Research of properties and its application on JSJ shrinkage reducing admixture[J]. Concrete, 2003(4): 53-55+57 (in Chinese).
[10] 张志宾,徐玲玲,刘利.高性能水泥基材料的减缩研究进展[J].材料导报,2006,20(7):43-45+50.
ZHANG Z B, XU L L, LIU L. The research progress of shrinkage of high performance cement-based materials[J]. Materials Review, 2006, 20(7): 43-45+50 (in Chinese).
[11] 黎碧云,孙振平,胡匡艺,等.减缩剂对新拌水泥浆体体积变化的影响[J].建筑材料学报,2020,23(3):493-499.
LI B Y, SUN Z P, HU K Y, et al. Effect of shrinkage reducing agents on absolute volume change of fresh cement paste[J]. Journal of Building Materials, 2020, 23(3): 493-499 (in Chinese).
[12] 党玉栋.减缩剂与内养护对水泥基材料体积稳定性的影响[D].重庆:重庆大学,2012.
DANG Y D. Influence of shrinkage reducing admixture and internal curing on volume stability of cement based materials[D]. Chongqing: Chongqing University, 2012 (in Chinese).
[13] 方庆伟.减缩剂对水泥基材料性能的影响研究[D].杭州:浙江大学,2015.
FANG Q W. Study on the effect of shrinkage-reducing agents on the properties of cement-based materials[D]. Hangzhou: Zhejiang University, 2015 (in Chinese).
[14] FOLLIARD K J, BERKE N S. Properties of high-performance concrete containing shrinkage-reducing admixture[J]. Cement and Concrete Research, 1997, 27(9): 1357-1364.
[15] TAZAWA E I, MIYAZAWA S. Influence of cement and admixture on autogenous shrinkage of cement paste[J]. Cement and Concrete Research, 1995, 25(2): 281-287.
[16] 孔爱散,周长顺.减缩剂在水泥基材料中的应用研究进展(I)——工作性、力学性能、耐久性[J].混凝土,2020(5):73-78.
KONG A S, ZHOU C S. Research progress of application of shrinkage-reducing admixture in cement-based materials (I)—workability, mechanical properties and durability[J]. Concrete, 2020(5): 73-78 (in Chinese).
[17] 刘路明,方志,黄政宇,等.膨胀剂与内养剂对超高性能混凝土性能的影响[J].硅酸盐学报,2020,48(11):1706-1715.
LIU L M, FANG Z, HUANG Z Y, et al. Effects of expansive agent and super-absorbent polymer on performance of ultra-high performance concrete[J]. Journal of the Chinese Ceramic Society, 2020, 48(11): 1706-1715 (in Chinese).
[18] 邵运达.混凝土裂缝控制新材料的研究[D].北京:北京工业大学,2006.
SHAO Y D. The research of new material about concrete resist spliting[D]. Beijing: Beijing University of Technology, 2006 (in Chinese).
[19] 李林香,谢永江,冯仲伟,等.混凝土的收缩及防裂措施概述[J].混凝土,2011(4):113-117.
LI L X, XIE Y J, FENG Z W, et al. General comments of shrinkage of concrete and the methods of crack resistance[J]. Concrete, 2011(4): 113-117 (in Chinese).
[20] 游宝坤.膨胀剂对高性能混凝土的裂缝控制作用[J].建筑技术,2001,32(1):18-21.
YOU B K. Control function of expansion additive to high performance concrete cracks[J]. Architecture Technology, 2001, 32(1): 18-21 (in Chinese).
[21] 刘加平,田倩,唐明述.膨胀剂和减缩剂对于高性能混凝土收缩开裂的影响[J].东南大学学报(自然科学版),2006,36(s2):195-199.
LIU J P, TIAN Q, TANG M S. Influence of expansion agent and shrinkage reducing agent on shrinkage cracking of high performance concrete[J]. Journal of Southeast University (Natural Science Edition), 2006, 36(s2): 195-199 (in Chinese).
[22] 韩建国,阎培渝.系统化的高性能混凝土配合比设计方法[J].硅酸盐学报,2006,34(8):1026-1030.
HAN J G, YAN P Y. Mix proportion design method for systematical high performance concrete[J]. Journal of the Chinese Ceramic Society, 2006, 34(8): 1026-1030 (in Chinese).