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Materials 2014, 7(5), 3415-3426; doi:10.3390/ma7053415

Influence of Chloride-Ion Adsorption Agent on Chloride Ions in Concrete and Mortar

Faculty of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
Department of Civil Engineering, Tsinghua University, Beijing 100084, China
Author to whom correspondence should be addressed.
Received: 24 February 2014 / Revised: 17 March 2014 / Accepted: 21 April 2014 / Published: 30 April 2014
(This article belongs to the Special Issue Construction Materials)
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The influence of a chloride-ion adsorption agent (Cl agent in short), composed of zeolite, calcium aluminate hydrate and calcium nitrite, on the ingress of chloride ions into concrete and mortar has been experimentally studied. The permeability of concrete was measured, and the chloride ion content in mortar was tested. The experimental results reveal that the Cl agent could adsorb chloride ions effectively, which had penetrated into concrete and mortar. When the Cl agent was used at a dosage of 6% by mass of cementitious materials in mortar, the resistance to the penetration of chloride ions could be improved greatly, which was more pronounced when a combination of the Cl agent and fly ash or slag was employed. Such an effect is not the result of the low permeability of the mortar, but might be a result of the interaction between the Cl agent and the chloride ions penetrated into the mortar. There are two possible mechanisms for the interaction between the Cl agent and chloride ion ingress. One is the reaction between calcium aluminate hydrate in the Cl agent and chloride ions to form Friedel’s salt, and the other one is that calcium aluminate hydrate reacts with calcium nitrite to form AFm during the early-age hydration of mortar and later the NO2 in AFm is replaced by chloride ions, which then penetrate into the mortar, also forming Friedel’s salt. More research is needed to confirm the mechanisms.
Keywords: concrete; chloride-ion resistant agent; permeability; durability; mortar concrete; chloride-ion resistant agent; permeability; durability; mortar
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Peng, G.-F.; Feng, N.-Q.; Song, Q.-M. Influence of Chloride-Ion Adsorption Agent on Chloride Ions in Concrete and Mortar. Materials 2014, 7, 3415-3426.

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