Journal ArticleDOI
Modeling the sulfate attack induced expansion of cementitious materials based on interface-controlled crystal growth mechanisms
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TLDR
In this article , a poromechanical model based on the surface-controlled ettringite growth mechanism and the chemical composition of the solution was proposed to explain both external sulfate attack (ESA) and delayed ettricite formation (DEF) in a similar model.About:
This article is published in Cement and Concrete Research.The article was published on 2022-02-01. It has received 13 citations till now. The article focuses on the topics: Ettringite & Supersaturation.read more
Citations
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Zero-Cement Concrete Resistance to External Sulfate Attack: A Critical Review and Future Needs
TL;DR: In this paper , a critical review of the current aging protocol associated with ordinary cement resistance and zero-cement concrete or AAMs to external sulfate attack is presented, and the adequacy of the standard sulfate immersion tests raises more concerns about the reported behavior.
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Spalling rate of concretes subject to combined leaching and external sulfate attack
TL;DR: In this paper , a spalling rate model is established to estimate the damage of concretes subject to the combined action of leaching and external sulfate attack (ESA), and two sub-models are developed to consider the different damage patterns.
Journal ArticleDOI
Spalling Rate of Concretes Subject to Combined Leaching and External Sulfate Attack
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Long-term performance and microstructural characteristics of cement mortars containing nano-SiO2 exposed to sodium sulfate attack
Qian Huang,Guangqi Xiong,Zheng Fang,Shiji Wang,Chong Wang,Huayin Sun,Shicai Yuan,Xiao Ya Zhu +7 more
TL;DR: In this paper , the long-term degradation of nano-SiO2 (NS) modified cement mortar exposed to sodium sulfate (Na2SO4) attack was investigated in joint with the mineralogical and microstructural changes.
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A Critical Review of Existing Test-Methods for External Sulfate Attack
TL;DR: In this paper , a critical review of some existing test methods and foreign national standard methods for external sulfate attack (ESA) is presented, analyzed, and discussed, and some proposed recommendations for improving these methods to meet the needs of structure managers.
References
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Journal ArticleDOI
A closed-form equation for predicting the hydraulic conductivity of unsaturated soils
van Genuchten,M. Th. +1 more
TL;DR: Van Genuchten et al. as mentioned in this paper proposed a closed-form analytical expression for predicting the hydraulic conductivity of unsaturated soils based on the Mualem theory, which can be used to predict the unsaturated hydraulic flow and mass transport in unsaturated zone.
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Crystallization in pores
TL;DR: In this paper, the authors discuss the thermodynamics of crystallization within porous materials and the factors that influence stress development and cracking, including the pore size, the energy of the interface between pore wall and the crystal, and the yield stress or buckling strength of the crystal.
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Stress from crystallization of salt
TL;DR: In this paper, the thermodynamic and kinetic factors influencing crystallization pressure are reviewed for cases including capillary rise and evaporation, cyclic wetting and drying, and hydration of cement.
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Delayed ettringite formation
TL;DR: In this article, chemical and microstructural aspects of delayed ettringite formation are reviewed, and the authors show that the rate and ultimate extent of expansion are influenced by factors of three types: chemistry, paste microstructure, which determines the stresses produced by its formation.
Journal ArticleDOI
Does gypsum formation during sulfate attack on concrete lead to expansion
Bing Tian,Menashi D. Cohen +1 more
TL;DR: In this paper, an investigation carried out to study the gypsum formation during sulfate attack and its consequences was carried out, and the results suggested that the formation may cause expansion.