Results 211 to 220 of about 42,334 (260)

Influence of clinker sulfate on cement paste external sulfate attack

Advances in Cement Research, 2013
This paper aims to clarify the influence of the clinker sulfate on external sulfate attack of cement paste. The investigation shows that the clinker sulfate does not have any direct influence on the resistance of cement to external sulfate attack. Indirectly this sulfate reduces the amount of tricalcium aluminate (C3A) and tricalcium silicate (C3S ...
Horkoss, Sayed, Julien, Simone, Escadeillas, Gilles, Lteif, Roger, Rizk, Toufic   +4 more
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Aspects of Sulfate Attack on Concrete

Cement, Concrete, and Aggregates, 1979
Abstract This paper discusses three aspects of sulfate attack on concrete that are important in understanding the development of sulfate-resisting concretes. These are: the importance of a precipitated layer of reaction products at the surface of the concrete, the role of aggregate type in the formation of ettringite, and the importance ...
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"Sulfate Soundness, Sulfate Attack, And Expansive Cement In Concrete"

SP-223: Investigating Concrete-Selected Works of Bryant and Katharine Mather, 2004
Abstract : The paper discusses the physical and chemical effects of the phenomena associated with the formation of hydrated sulfates in concrete, aggregate, paste, and mortar. The relation of the physical properties of the material surrounding the locus at which the hydrated sulfate is produced to the amount of expansion that results, the degree to ...
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Sulfate attack on hardened cement paste

Cement and Concrete Research, 1994
Hardened cement paste specimens made with fifferent cement types and varying water-cement ratios (w/c) were immersed in 5% sodium sulfate solution maintained at constant pH value of 6. The distribution curves for ettringite, gypsum, and portlandite phases were obtained by using layer by layer XRD analysis and interpreted in terms of material damage due
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Evaluating deterioration of concrete by sulfate attack

Journal of Wuhan University of Technology-Mater. Sci. Ed., 2007
Effects of factors such as water to cement ratio, fly ash and silica fume on the resistance of concrete to sulfate attack were investigated by dry-wet cycles and immersion method. The index of the resistance to sulfate attack was used to evaluate the deterioration degree of concrete damaged by sulfate.
Guangcheng Long, Youjun Xie, Xuguang Tang   +2 more
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Sulfate attack on concrete with mineral admixtures

Cement and Concrete Research, 1996
Abstract The sulfate resistance of concretes containing fly ash, natural pozzolan and slag is investigated in a field test in which concrete specimens were half-buried in sulfate soil for five years. Mineral admixtures were used as a partial replacement for ordinary portland cement (C3A = 8.5%), and the progress of sulfate attack was evaluated by ...
E.F. Irassar, A. Di Maio, O.R. Batic
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Sulfate Crystallization Attack on Cement-Based Materials

Key Engineering Materials, 2008
The physical crystallization action of sulfate in cement based material, which often occurs by dry-wet cycle, capillary rising and evaporating action, can damage seriously cement-based materials as compared to chemical corrosion by sulfate. The deterioration mechanism of cement-based materials by sulfate crystallization attack, experimental ...
You Jun Xie, Kun Lin Ma, Guang Cheng Long   +2 more
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Sulfate Attack on Concrete: Research Needs

ACI Materials Journal, 1991
The mechanism of sulfate attack on portland cement concrete is not well understood. This has limited confidence that can be placed in and hence the reliability of existing standard tests and models to predict performance and service life of concrete subjected to sulfate attack. A systematic research effort is necessary to establish 5 criteria.
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Ettringite Formation and Sulfate Attack on Concrete

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference", 2001
The paper presents a critical review of the relationship between ettringite formation and sulfate attack. Ettringite formation is associated with expansion. However, any ettringite-related expansion is not necessarily related to sulfate attack. Early ettringite formation (EEF) which occurs immediately (within hours) in a plastic fresh mixture does not ...
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Damage to Concrete Flatwork from Sulfate Attack

Journal of Performance of Constructed Facilities, 1995
In order to resist sulfate in soil or ground water, concrete must be of high quality, be well consolidated, be as impermeable as possible, and have sulfate-resistant cement. This paper describes the damage to concrete flatwork caused by sulfate attack. Four of six laboratory tests indicated that the silty clay fill supporting the concrete flatwork had ...
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