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External sulfate attack on compressed stabilized earth blocks
Construction and Building Materials, 2019Abstract Cementitious materials can be damaged by external sulfate attack due to ingress of sulfate ions from external environment. This process causes loss of cohesion, increase in porosity, local expansion, spalling and cracking. The objectives of this work were to study the influence of the capillary absorption time and of the sulfate ions ...
Wesley V.D.C. Bezerra +1 more
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Effect of Metakaolin on External Sulfate Attack
SP-192: 2000 Canmet/ACI Conference on Durability of Concrete, 2000This paper reports a study on the effect of a high-reactivity metakaolin (HRM) on the sulfate resistance of mortars. Mortar bars containing 0-25% HRM were prepared in accordance with ASTM C 1012-89 with three cements of varying tricalcium aluminate content. After 6 months exposure to a 5% N2SO4 solution, mortar bars incorporating any level of HRM (5-25%
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Multi-parameter study of external sulfate attack in blended cement materials
Construction and Building Materials, 2010A conventional solution in reducing the potential damage in concrete structures from external sulfate attack is to partially replace the Portland cement with appropriate fly ash. Presently, the compatibility of fly ash as a remedial cement substitution is based on empirically developed ASTM classifications.
A. Bonakdar, B. Mobasher
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Key inhibitory mechanism of external chloride ions on concrete sulfate attack
Construction and Building Materials, 2019Abstract To explore the key inhibitory mechanism of external chloride ions on concrete sulfate attack, long-term partial- and full-immersion experiments of concrete in chloride solutions and chloride and sulfate composite solutions were performed.
Jianmin Du +4 more
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Do the geometry and aggregates size influence external sulfate attack mechanism?
Construction and Building Materials, 2017Abstract ESA performance testing protocols are mainly a set of exposure conditions, monitoring strategy, and specimens configuration. Although the large feedback on the representativeness of exposure conditions and the relevance of monitored parameters, the effect of specimen configuration still deserved to be studied.
Georges Massaad +3 more
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Numerical modelling of mechanical deterioration of cement mortar under external sulfate attack
Construction and Building Materials, 2018Abstract An integrated numerical method is developed to model the deterioration of mechanical properties of cement mortar under external sulfate attack (ESA). The proposed method is module-oriented, which includes three modules, i.e. an ionic diffusion module, a chemical reaction module and a mechanical module. In the mechanical module, an analytical
Yuguo Yu, Yx Zhang
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Modeling of damage in cement paste subject to external sulfate attack
Computers and Concrete, 2015This study aimed to develop models of sulfate diffusion and ettringite content profile in cement paste for the predication of the damage behavior in cement paste subject to external sulfate. In the models, multiphase reaction equilibrium between ions in pore solution and solid calcium aluminates phases and the microstructure changes in different ...
Chuansheng Xiong +3 more
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Numerical Modelling of Degradation of Cement Paste under External Sulfate Attack
Applied Mechanics and Materials, 2016In this study, a numerical method is developed to simulate the degradation of cement paste when subjected to sodium sulfate solutions. The proposed numerical method accounts for ionic diffusion, chemical reactions and the damage propagations, which are three main phenomena accompanied with degradation.
Yu, Yuguo +2 more
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An integrated macro-microscopic model for concrete deterioration under external sulfate attack
Engineering Fracture Mechanics, 2020Abstract Concrete deterioration caused by external sulfate attack (ESA) is a macro-microscopically interactive expansion process, including two stages, namely a dormant period and detrimental duration. Based on ESA-induced deterioration mechanism, an integrated macro-microscopic model has been developed to describe the deterioration of concrete.
Guang-Ji Yin +3 more
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Key Engineering Materials, 2016
External sulfate attacks induce severe deterioration of concrete because of several phenomena: leaching, precipitation of expansive products, aggregates loss, and cracking. A new methodology has been developed to assess sulfate resistance of cement-based materials.
Georges Massaad +3 more
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External sulfate attacks induce severe deterioration of concrete because of several phenomena: leaching, precipitation of expansive products, aggregates loss, and cracking. A new methodology has been developed to assess sulfate resistance of cement-based materials.
Georges Massaad +3 more
openaire +1 more source