[1] Qian Chunxiang, Lu Wangjie, He Zhihai, Fan Lingzhi, et al. Influence of superplasticizerson the early-age crack resistance of concrete [J]. Journal of Southeast University (English Edition), 2012, 28 (1): 41-45. [doi:10.3969/j.issn.1003-7985.2012.01.008]

Copy

Influence of superplasticizerson the early-age crack resistance of concrete()

Share：

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

28

Issue:

2012 1

Page:

41-45

Research Field:

Materials Sciences and Engineering

Publishing date:

2012-03-30

Info

Title:

Influence of superplasticizerson the early-age crack resistance of concrete

Author(s):

Qian Chunxiang¹;  Lu Wangjie¹;  He Zhihai¹;  Fan Lingzhi¹;  Qu Jun²;  Guo Jingqiang²

¹School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
²Sika Technology AG, Baar 6341, Switzerland

Keywords:

superplasticizer;  crack resistance;  slab test method;  temperature-stress test method

PACS:

TU528

DOI:

10.3969/j.issn.1003-7985.2012.01.008

Abstract:

In order to improve the early-age cracking resistance of concrete, different types of superplasticizers are used. Two types of polycarboxlic salt/acid superplasticizers and one retarding naphthalene superplasticizer are selected to investigate the influence of superplasticizers on the early-age cracking resistance of the concrete by using the slab test and the temperature-stress test. The results show that the polycarboxlic salt/acid superplasticizer cannot always improve the cracking resistance capacity of the concrete compared with the naphthalene superplasticizer, which is related to the chemical structure of the polycarboxlic salt/acid superplasticizer. High plastic tensile strength and dynamic elastic modulus at the early stage are beneficial to avoid cracking, and low hydration heat is also helpful. The evolutions of the drying shrinkage stress and the hydration heat temperature stress varying with time can be comprehensively evaluated by means of the slab test and the temperature stress test.

References:

[1] Gerard B, Marchand J. Influence of cracking on the diffusion properties of cement-based materials, Part Ⅰ: influence of continuous cracks on the steady-state regime [J].Cement and Concrete Research, 2000, 30(1):37-43.
[2] Zhu Yijia. Effect mechanism research of water reducers on dry shrinkage of cement concrete[D]. Beijing:China Building Materials Academy, 2006:8-11.(in Chinese)
[3] Chen Bo, Cai Yuebo, Ding Jiantong. Comprehensive evaluation index of crack resistance of dam concrete [J]. Concrete, 2008(10):5-7.(in Chinese)
[4] Chen Yu, Zhang Qisen. Research status on the early-age crack resistance of cement concrete [J]. Journal of Building Materials, 2004, 7(4):411-417.(in Chinese)
[5] Li Hongjun, Tu Liuqing, Qin Minqiang, et al. Research on the early-age cracking susceptibility of Polypropylene fiber reinforced concrete [J]. The World of Building Materials, 2009, 1(30):41-44.(in Chinese)
[6] Gen Fei. Research of cement-based materials on plastic shrinkage and drying shrinkage [D].Nanjing: School of Materials Science and Engineering of Southeast University, 2004.(in Chinese)
[7] Liu Hongwei, Xie Li, Wu Shengxin. Tentative research on non-destructive detection of early-age elastic modulus of concrete [J]. Concrete, 2008(6):36-38.(in Chinese)
[8] Li Yue, Huo Kaicheng, Huang Jun. Experimental study on the early-age shrinkage and cracking susceptibility of concrete [J]. Journal of Huazhong University of Science and Technology:Urban Science Edition, 2007, 24(3):56-59.(in Chinese)
[9] Zhang Guozhi, Tu Liuqing, Xia Weihua, et al. Study on evaluation index of early ages cracking of concrete [J]. Concrete, 2005(5):13-17.(in Chinese)

Memo

Memo:

Biography: Qian Chunxiang(1966—), female, doctor, professor, cxqian@seu.edu.cn.
Foundation item: International Collaborative Research Project of Sika Technology AG of Switzerland, the Traffic Scientific Research Project in Jiangsu Province(No.2010Y01).
Citation: Qian Chunxiang, Lu Wangjie, He Zhihai, et al. Influence of superplasticizers on the early-age crack resistance of concrete[J].Journal of Southeast University(English Edition), 2012, 28(1):41-45.[doi:10.3969/j.issn.1003-7985.2012.01.008]

Common functions