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Water absorption changes in mortars with crystalline admixture exposed to acid environment

Author(s): Victoria Eugenia García-Vera, Antonio José Tenza-Abril, Marcos Lanzón, Afonso Miguel Solak, Concepción Pla, David Benavente
Paper category: Proceedings
Book title: SynerCrete’18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time Vol. 1 & 2
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 369-374
Total Pages: 6
Language : English

Abstract: In industrial cities, a common attack in concrete is sulfuric acid attack. Sulfuric acid is particularly corrosive due to the sulfate ion in addition to the dissolution caused by the hydrogen ion causing the deterioration of the cementitious materials. To improve acid attack resistance in those materials, the matrix must be dense, with low permeability, use in the production a sulfate resistant cement or high alumina cement, etc. Crystalline admixtures are used as a waterproofing product because they improve the protection of the cementitious materials filling the capillaries preventing the penetration of liquid by crystals formation that fill the capillary pores and micro-cracks, blocking the water entrance. The main objective of this work is to study the behaviour of mortars produced with the same quantity of cement, water, fine aggregate and including different percentages of crystalline admixture (1%, 1.5% and 2%) in an aggressive environment (sulfuric acid solution - 3% w/w). Changes in the mass, density, porosity and capillary absorption coefficient after 28 and 56 days of fully submerged in H2SO4 solution. From the results obtained, we can observe a noticeable better performance of the mortars with crystalline admixtures.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00

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