Study on the effect of mineral admixture on the water stability of UHPC under long-term immersion

Yuan, Y.; Zhang, Wenhua; Sun, Guozhe; Wang, Yu; Wang, Fan; Zhang, Yunsheng

doi:10.1016/j.conbuildmat.2023.131276

Cited by 7 publications

(2 citation statements)

References 29 publications

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“…In addition, sulphates are prevented from reacting by connecting the Ca(OH) 2 in the fly ash environment to make the concrete more durable against sulphates found in the environment. This reduces the binder’s Ca(OH) 2 and C3A ratios [ 37 , 38 , 39 ]. These two harmful chemical reaction products are the result of sulphate ions combined with aluminium (C3A) and calcium (Ca(OH) 2 ) components in hardened concrete [ 40 , 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Ultrafine Fly Ash against Sulphate Reaction in Concrete Structures

Demir Şahin,

Eker

2024

Materials

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In this study, Afşin Elbistan C-type fly ash (FA) was used, which protects against the sulphate reaction that damages concrete. The detrimental effects of post-reaction decrease with increasing fly ash fineness. The study used 10%, 30%, and 50% weight substitutes of cement. The fly ash was ground in a ball mill for 0, 10, 20, 30, 45, and 60 min, and Blaine fineness values of 1555, 1632, 2347, 2589, 2766, and 3433 cm2/g were obtained, respectively. The effect of the samples on the sulphate resistance was investigated by exposing the samples to 5% or 10% added sulphate solutions, and the compressive strength and ultrasonic pulse velocity of the concrete were tested. The compressive strength values obtained decreased with the increase in sulphate content, and the increase in the grinding time and the amount of substituted FA increased the compressive strength values. It was observed that weight loss increased with increasing sulphate content and decreased with the addition of FA with a high Blaine fineness. It was determined that as the Blaine fineness value increased, the sulphate content, FA substitution amount, and ultrasonic pulse speed decreased. This study was carried out to determine the effects of fly ash used at different fineness and replacement ratios on the performance and strength of concrete after exposure to external influences such as sulphate. The use of fly ash instead of cement will reduce the use of waste materials and natural resources and prevent environmental pollution. The cost of cement and concrete will be reduced.

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Section: Introductionmentioning

confidence: 99%

“…In addition to the importance of the environmental and economic impact of fly ash, its use as a cement replacement contributes greatly to saving resources and improving concrete performance. In addition, it prevents sulphate damage and microstructural deterioration of the concrete produced [ 39 , 60 ].…”

Section: Introductionmentioning

confidence: 99%