Evaluation of Protective Effectiveness and Microstructure of Silicate Concrete Sealer

Abstract:

This study employed Taguchi method to identify key factors influencing the protection provided by the surface treatment of reinforced concrete structures. We evaluated the protective characteristics of silicate concrete sealer (SCS) as well as its underlying mechanisms. An L12 (2⁷) orthogonal array was produced using seven control factors and two levels to obtain the necessary data from only twelve experiments. Tests were performed to evaluate compressive strength, water absorption, and permeability. The major factors influencing the effectiveness of SCS included the water-binder ratio of the substrate, cumulative curing time of the sealer, content of pozzolanic material, and type of sealer materials. XRD analysis and SEM observation revealed the composition and efficacy of SCS in protecting concrete. The SCS reacted chemically with the cement hydration product Ca (OH)₂ and filled the pore structure with C-S-H gel, which succeeded in greatly improving the mechanical properties of the concrete.

• Periodical: Applied Mechanics and Materials (Volumes 368-370)
• Pages: 892-896
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.368-370.892
• Online since: August 2013
• Authors: Si Yu Zou, Ran Huang, An Cheng, Wei Ting Lin
• Keywords: Concrete Surface Treatment, C-S-H Gel, Taguchi Method

References

[1] Han Young Moon, Dong Gu Shin, Doo Sun Choi, Evaluation of the durability of mortar and concrete appliedwith inorganic coating material and surface treatment system. Construction and Building Materials, Vol. 21, p.362–369 (2007).

DOI: 10.1016/j.conbuildmat.2005.08.012

[2] Michael T. Kubal, Construction Waterproofing Handbook: Second Edition (2008).

[3] Erdogan Ozbay, Ahmet Oztas, Adil Baykasoglu, Hakan Ozbebek, Investigating mix proportions of high strength self compacting concrete by using Taguchi method, Construction and Building Materials Vol. 23 , p.694–702 (2009).

DOI: 10.1016/j.conbuildmat.2008.02.014

[4] Dr. Iraj H.P. Mamaghani, Dr. Charles Moretti, Bruce A. Dockter, Application of Sealing Agents in Concrete Durability of Infrastructure Systems, Department of Civil Engineering University of North Dakota, April 30 (2007).

[5] C.Y. Chang, R. Huang, P.C. Lee, T.L. Weng, Application of a weighted Grey-Taguchi method for optimizing recycled aggregate concrete mixtures, Cement & Concrete Composites, Vol. 33, p.1038–1049 (2011).

DOI: 10.1016/j.cemconcomp.2011.06.005

[6] A.A. Almusallam, F.M. Khan, S.U. Dulaijan, O.S.B. Al-Amoudi. Effectiveness of surface coatings in improving concrete durability. Cement & Concrete Composites 25, pp.473-481, (2003).

DOI: 10.1016/s0958-9465(02)00087-2

[7] LaRosa, J. Thompson, Characterization of Silicate Sealers on Concrete, Cement and Concrete Research, Vol. 27, No. 10, p.1561–1567 (1997).

DOI: 10.1016/s0008-8846(97)00167-1

[8] Rikard Ylmén, Ulf Jäglid, Britt-Marie Steenari, Early hydration and setting of Portland cement monitored by IR, SEM and Vicat techniques Itai Panas, Cement and Concrete Research, Cement and Concrete Research , Vol. 39 p.433–439 (2009).

DOI: 10.1016/j.cemconres.2009.01.017