上海交通大学学报(英文版) ›› 2012, Vol. 17 ›› Issue (5): 629-634.doi: 10.1007/s12204-012-1335-4

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Effects of Mineral Admixtures and Superplasticizers on Micro Hardness of Aggregate-Paste Interface in Cement Concrete

WANG Zhen-jun* (王振军), WANG Qiong (王琼), WEI Yong-feng (魏永锋)   

  1. (School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China)
  • 出版日期:2012-10-30 发布日期:2012-11-16
  • 通讯作者: WANG Zhen-jun* (王振军) E-mail:wangzhenjun029@163.com

Effects of Mineral Admixtures and Superplasticizers on Micro Hardness of Aggregate-Paste Interface in Cement Concrete

WANG Zhen-jun* (王振军), WANG Qiong (王琼), WEI Yong-feng (魏永锋)   

  1. (School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China)
  • Online:2012-10-30 Published:2012-11-16
  • Contact: WANG Zhen-jun* (王振军) E-mail:wangzhenjun029@163.com

摘要: This paper presents quantitatively the results of an experimental investigation on influence of mineral admixtures and superplasticizers on Vickers micro hardness (HV) of aggregate-paste interface in cement concrete. The HV was measured by Vickers hardness testing equipment. The results indicate that addition of fly ash decreases HV of the concrete. Although it decreases with the increase of ground granulated blast furnace slag (GGBS) replacement, the HV is higher than that of concrete containing fly ash at all replacements. The flying ash and GGBS composition increases HV in later curing ages, but does not improve it in early curing ages. Aminosulfonic acid based superplasticizer and aliphatic hydroxy sulphonate condensate superplasticizer can enhance HV in early curing ages. The HV of concrete with polycarboxylic acid superplasticizer is higher in later curing ages.

关键词: cement concrete, aggregate-paste interface, Vickers micro hardness, superplasticizer, mineral admixture

Abstract: This paper presents quantitatively the results of an experimental investigation on influence of mineral admixtures and superplasticizers on Vickers micro hardness (HV) of aggregate-paste interface in cement concrete. The HV was measured by Vickers hardness testing equipment. The results indicate that addition of fly ash decreases HV of the concrete. Although it decreases with the increase of ground granulated blast furnace slag (GGBS) replacement, the HV is higher than that of concrete containing fly ash at all replacements. The flying ash and GGBS composition increases HV in later curing ages, but does not improve it in early curing ages. Aminosulfonic acid based superplasticizer and aliphatic hydroxy sulphonate condensate superplasticizer can enhance HV in early curing ages. The HV of concrete with polycarboxylic acid superplasticizer is higher in later curing ages.

Key words: cement concrete, aggregate-paste interface, Vickers micro hardness, superplasticizer, mineral admixture

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