Paper Title:
Chloride Diffusion Characteristics of the New Interface Transition Zone in Recycled Aggregate Concrete
  Abstract

A three-part model (mortar, original concrete and ITZ) was established in this study to analyze the chloride coefficient of the new interfacial transition zone (ITZ) in recycled aggregate concrete (RAC). Based on this model, a formula for calculation was derived from the chloride transport characteristics in the steady state. Two types of RAC were used to study the properties of ITZ by steady-state migration test and Scanning Electron Microscope (SEM) method. The results indicate that the chloride diffusion coefficient of new ITZ in RAC is about 1 to 4 cm2/year, and that the addition of superfine phosphorous slag (PHS) not only reduces the chloride diffusion coefficient of mortar but also decreases the thickness and the chloride diffusion coefficient of new ITZ in RAC due to its pozzolanic reaction effect. The chloride permeability of mortar containing 20% PHS is only 1/5 of that in normal RAC. The chloride diffusion coefficient of ITZ in normal RAC is about 10 times greater than that of ordinary mortar. When modified with PHS and superplasticizer, the permeability of chloride in new ITZ is 3 to 7 times greater than that in the ordinary bulk cement paste. Furthermore, the mechanism and the effects of superfine phosphorous slag (PHS) on the resistivity of chloride permeation were discussed on basis of the experimental results and the images of SEM.

  Info
Periodical
Advanced Materials Research (Volumes 261-263)
Edited by
Jingying Zhao
Pages
104-110
DOI
10.4028/www.scientific.net/AMR.261-263.104
Citation
H. L. Wang, J. J. Wang, X. Y. Sun, J. Cheng, "Chloride Diffusion Characteristics of the New Interface Transition Zone in Recycled Aggregate Concrete", Advanced Materials Research, Vols. 261-263, pp. 104-110, 2011
Online since
May 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Guang Cheng Long, You Jun Xie, Zhi Wu Yu
Abstract:The chloride ions and sulfate ions precipitating rates in surface layer of different mortars was experimentally measured. And the concept of...
187
Authors: Jun Zhao, Gao Chuang Cai, Dan Ying Gao
Abstract:The binding properties of chloride ion of sulphoaluminate cement and portland cement were studied in different age,different water-cement...
698
Authors: Jing Wei Ying, He Gong Chen
Abstract:In this paper, the influence of recycled aggregates volume fraction (Fra) on chloride induced permeability of recycled aggregates concrete...
151
Authors: Xiang Hao Wu, Pan Yuan, Yan Tao Jiao
Abstract:The influence of fly ash as cement replacement on pore structure, chloride penetration and frost resistance of recycled concrete is...
1031
Authors: Tze Yang Darren Lim, Bahador Sabet Divsholi, Susanto Teng
Chapter 5: Monitoring, Evaluation and Reinforcement Technique of Civil Engineering
Abstract:In today’s rapid construction, a reliable method for quick evaluation of concrete quality during construction is very important. The...
1989