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http://dx.doi.org/10.14190/JRCR.2016.4.4.463

Water Permeability Performance Evaluation of Mortar Containing Crack Self-healing Mineral Admixtures  

Lee, Woong-Jong (Self-healing Green Concrete Research Center, Sungkyunkwan University)
Hwang, Ji-Soon (Technology Research Center, Intchem Co., Ltd.)
Ahn, Sang-Wook (Technology Research Center, Intchem Co., Ltd.)
Lee, Kwang-Myong (Department of Civil, Architectural and Environmental System Engineering, Sungkyunkwan University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.4, no.4, 2016 , pp. 463-469 More about this Journal
Abstract
In this paper, compressive strength and water permeability performance for two types of crack self-healing materials such as SH-PO-0 composed of mineral admixtures(expansive agent, swelling material and crystal growth agent) and SH-PO-(5, 15, 30) blended with SH-PO-0 and phosphate additive(PO) dissolving easily calcium ion, were evaluated. The test results show that the water flow of SH-PO-0 decreased steeply at the early age although compressive strength decreased about 9% at 28 days compared with OPC. The higher PO replacement ratio is, the lower compressive strength and more improved water permeability performance is, and thus, based on such results, adequate PO replacement ratio is 15%. It is also found that the self-healing performance of SH-PO-15 was quite improved at the early ages and however, the performance of SH-PO-15 is similar to one of SH-PO-0 at long-term ages, and 28 days compressive strength of SH-PO-15 decreased about 8% compared with SH-PO-0. In addition, it is confirmed from the analysis of SEM-EDS that calcium ions of SH-PO-15 were crystallized more than those of SH-PO-0.
Keywords
Self-healing; Crack; Calcium carbonate; Unhydrated cement; Water permeability test;
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