Mitigating alkali-silica reaction induced concrete degradation through cement substitution by metakaolin and bentonite

Wei, Jianqiang; Gencturk, Bora; Jain, Amit; Hanifehzadeh, Mohammad

doi:10.1016/j.clay.2019.105257

Cited by 51 publications

(19 citation statements)

References 61 publications

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“…The same trend of increased expansion of the specimens with higher metakaolin content was observed. According to researchers [34][35], metakaolin reduces ASR-induced expansion of cementitious materials. Reduced levels of calcium in ASR products, which are associated with expansion, were identified in the presence of metakaolin.…”

Section: Resultsmentioning

confidence: 99%

The Effect of a Complex Pozzolanic Additive Consisting of Milled Glass and Metakaolin on the Degradation of a Cementitious Composite With Ground Waste Glass Caused by Alkali-Silica Reaction

Barkauskas¹

2022

Ceramics - Silikaty

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This paper investigates the effect of partial replacement of cement by milled glass (MS), metakaolin (MK), and their mixture and partial replacement of sand by crushed glass (TS)on the physical and mechanical properties of a cementitious composite, as well as on the resistance of the composite to degradation caused by alkali-silica reaction (ASR). After 28 and 56 days of curing, the highest improvement in the mechanical properties was observed in the batches of specimens with the MS, MK and their mixture. The physical and mechanical properties of specimens with partially replaced sand to TS also deteriorated the least (the lowest expansion 0.02 %) with the application of the MS and MK mixture after 56 days of exposure to alkaline attack. XRD and microstructural analyses have shown that the reduction in expansion is due to the higher content of hydration products, as well as to the denser contact zone between the aggregate and the cementitious matrix.

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Section: Resultsmentioning

confidence: 99%

The Effect of a Complex Pozzolanic Additive Consisting of Milled Glass and Metakaolin on the Degradation of a Cementitious Composite With Ground Waste Glass Caused by Alkali-Silica Reaction

Barkauskas¹

2022

Ceramics - Silikaty

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“…Beijing Baofeng Digital Technology Co., Ltd., independently developed a high-tech biofeedback psychological training product with human-computer interaction, as shown in Table 1. e system integrates training, testing, and evaluation: above machine feedback project as a means of training, using infrared electric sensors to obtain human heart rate variability signals and the time domain and frequency domain index, the participants can see their heart rate through the computer before and after the autonomic balance, coordination state changes, and after the training heart rate variability charts and spectrum diagram can be obtained directly [6,7]. e SPCS system combines heart rate variability and biofeedback effectively and overcomes the dull and rigid deficiencies of previous biofeedback training with its vivid project training and colorful picture effect.…”

Section: Physiological Coherence and Autonomic Balance Systemmentioning

confidence: 99%

The Value of Biological Image Technology in Improving Athletes’ Motor Skills

Huang

Han

2021

Scientific Programming

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Objective. To explore the value of biological image technology in improving athletes’ motor skills. Methods. Golfers were given biofeedback relaxation training, and the variation trend and influence of biofeedback training on athletes’ heart rate variability were explored by monitoring and feedback evaluation of athletes’ heart rate variability. Results. Biofeedback relaxation training can help athletes improve the balance of sympathetic nerve and parasympathetic nerve, effectively inhibit the activity of sympathetic nerve, enhance the tension, effectively increase the heart rate variability of athletes, and strengthen the ability of psychological relaxation. Conclusion. Part of the research results show that biofeedback training can enhance athletes’ athletic performance and improve their athletic performance to a certain extent.

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“…27 H 2 O or Ca (Al-SiO 4 )12. 27 H 2 determined [25,28,35,36]. Also on ASR Gel and crystal products are formed on aggregate, mortar interface and air voids (Fig.…”

mentioning

confidence: 94%

The Effect of Pozzolans and Mineral Wastes on Alkali-silica Reaction in Recycled Aggregated Mortar

Külekçi

2021

Period. Polytech. Civil Eng.

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In this study, it was aimed to examine recycled aggregates (RA), which are considered as aggregates, in terms of alkali-silica reaction (ASR) before being used in concrete, to determine the risk status and to reduce the ASR value. In order to reduce and stop the ASR, the cement was replaced with clay brick and fly-ash by 10–40 %. Marble waste and Pb-Zn mine waste were used instead of RA in order to reduce aggregate reactivity. At the end of 28 days, compared to the control sample, it was observed that mortar bar samples containing tailings instead of fine RA has 18 % less expansion and marble waste (MW) added samples again instead of fine RA has 34 % less expansion. Furthermore, 40 % fly ash (FA) added samples decreased the level of ASR for 96 %, and in 10 % clay brick mixed samples ASR formation is decreased to 85 %. As a result, recycled aggregates were determined to be reactive for ASR. It has been determined that marble and lead-zinc mine facility wastes added as replace with to RA reduce the expansion effect by ASR in the cement paste. With this study, it has contributed to the safe use of the increasing use of RA in the world.

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Mitigating alkali-silica reaction induced concrete degradation through cement substitution by metakaolin and bentonite

Cited by 51 publications

References 61 publications

The Effect of a Complex Pozzolanic Additive Consisting of Milled Glass and Metakaolin on the Degradation of a Cementitious Composite With Ground Waste Glass Caused by Alkali-Silica Reaction

The Effect of a Complex Pozzolanic Additive Consisting of Milled Glass and Metakaolin on the Degradation of a Cementitious Composite With Ground Waste Glass Caused by Alkali-Silica Reaction

The Value of Biological Image Technology in Improving Athletes’ Motor Skills

The Effect of Pozzolans and Mineral Wastes on Alkali-silica Reaction in Recycled Aggregated Mortar

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