Quality Evaluation of Air Entraining Agent Based on Air Void Parameters of Fresh Concrete

Abstract:

In order to evaluate the quality of air entraining agent quickly and effectively. Air void parameters of fresh concrete with different air entraining agents were studied by Air Void Analyzer (AVA). The spacing factor and durability index of hardened concrete were tested and the relationship between the surface tension of air entraining agent and frost resistance of concrete was compared. The results showed that, the quality of air entraining agent can be evaluated quickly and effectively by diameter distribution of air bubbles in fresh concrete and spacing factor of fresh concrete. AEA2 introduced much more big air bubbles into concrete which is bad for the frost resistance of concrete. The quality of AEA2 was the worst, so the durability index of hardened concrete was 58.7%. Quality of air entraining agent cannot be characterized by properties of air entraining agent, but air entraining ability can be characterized by surface tension of air entraining agent. Keywords: air entraining agent (AEA), air void parameter, fresh concrete

• Periodical: Key Engineering Materials (Volumes 629-630)
• Pages: 593-599
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.629-630.593
• Online since: October 2014
• Authors: Lu Yang*, Yong Jiang Xie, Hua Jian Li
• Keywords: Air Entraining Agent (AEA), Air Void Parameter, Fresh Concrete

References

[1] Miu Changwen: High performance admixture for concrete. Chemical Industry Press(2008), p.154.

[2] Yang Qianrong: Durability of air entraining concrete and quality evaluation of air entraining agent. Tongji University(2007).

[3] GB8076-1999: Concrete admixtures (1999).

[4] ASTM C233-04: Standard test method for air-entraining admixture for concrete (2004).

[5] TB 10005-2010: Code for durability design on concrete structure of railway (2010).

[6] T. C. Powers: Void Spacing as a Basis for Producing Air-entrained Concrete. ACI Journal 50 (1954), pp.741-760.

DOI: 10.14359/11792

[7] JIM Grove: Using the air void analyzer for real-time quality adjustments in the field. National Concrete Pavement Technology Center 5 (2006), pp.46-49.

[8] T. Aarre: Air Void Analyzer. Concrete Technology Today 19(1998), p.4.

[9] Natalie Darraugh: Air Void Characterization in Fresh Cement Paste through Ultrasonic Attenuation using an Immersion Procedure. Georgia(2009).

[10] TP 75-08: Standard Method of Test for Air-Void Characteristics of Freshly Mixed Concrete by Buoyancy Change. AASHTO, USA (2008).

[11] ACI 201. 2R-08: Guide to durable concrete. USA Washington DC (2008).

[12] National Concrete Pavement Technology Center: Improving Variability and Precision of Air-Void Analyzer (AVA) Test results and developing rational specification limits. USA Washington DC(2008).

[13] Claus Germann Petersen: Air Void Analyzer (AVA) for Fresh Concrete, Last Advances. Ninth ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete. Sevilla, Spain (2009), pp.745-756.

DOI: 10.14359/51663238

[14] Kejin Wang. Improving Precision and Variability of Air-Void Analyzer Test Results. National Concrete Pavement Technology Center (2008).

[15] Yang Lu. Study on air void parameters of fresh concrete and hardened concrete. Chongqing University (2012).

[16] Li Huajian, Xie Yongjiang, Yang Lu. Air-void parameters measurement of fresh concrete and hardened concrete. Journal of Central South University of Technology, 4(2013), pp.1103-1108.

DOI: 10.1007/s11771-013-1590-z