The Study on Metakaolin's Effect of Restraining the Alkali-Silica Reaction of Slate Aggregate

Liu, Tong Chao; Li, Gu Hua; Huang, Wu‐Jang; He, Xiao; Fang, Jiang; Zhang, Long Sheng

doi:10.4028/www.scientific.net/amm.357-360.732

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…In a word, slag can't restrain ASR very well with the sandstone aggregate. And its effect is far worse than other admixture, such as silica fume, metakaolin [12].…”

Section: Experiments and Discussionmentioning

confidence: 99%

Effect of the Composite of Fly Ash and Slag on Alkali-Silica Reaction

Liu

Xiao

et al. 2014

AMR

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The study used the method of accelerated mortar bar test to study alkali aggregate reaction (ASR) with sandstone aggregate. Both fly ash and slag can inhibit the expansion of mortar bar. Results show that 50% slag can inhibit ASR reluctantly, but 10% fly ash and 20% slag can inhibit ASR very well, and the inhibitory effect of fly ash is far better than slag. Because of the high content of CaO in slag, it has inhibit and promote aspects, when the ASR is fierce, slag can inhibit ASR, otherwise slag can promote ASR.

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“…In a word, slag can't restrain ASR very well with the sandstone aggregate. And its effect is far worse than other admixture, such as silica fume, metakaolin [12].…”

Section: Experiments and Discussionmentioning

confidence: 99%

Effect of the Composite of Fly Ash and Slag on Alkali-Silica Reaction

Liu

Xiao

et al. 2014

AMR

Self Cite

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“…Many researchers have shown that some chemical admixtures e.g. lithium compounds and supplementary cementitious materials (SCM) such as silica fume, metakaolin, blast furnace slag, fly ashes, zeolite, glass powder, ground clay brick can be used successfully to minimise the effect of ASR [3][4][5][6][7][8][9][10][11][12][13][14]. It is known that mineral additions having pozzolanic properties are capable of reducing the ASR-induced expansion.…”

Section: Introductionmentioning

confidence: 99%

The effect of meta-halloysite on alkali–aggregate reaction in concrete

Zapała-Sławeta

2017

Mater Struct

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Damage to concrete structures may occur as a result of internal effects. Alkali silica reaction (ASR) is a long term reaction between alkalis and reactive aggregate present in the concrete. The reaction product is sodium-potasium-calcium silica gel, able to absorb water, resulting in the expansion and cracking of concrete. The key problem is to find the right method for mitigating the internal damage. This paper presents the results of an investigation into the effectiveness of calcined halloysite (meta-halloysite) in improving the resistance to alkali-silica reaction (ASR). The pozzolanic reactivity of meta-halloysite was also evaluated using Thermo-Gravimetric Analysis. Microstructures of mortar bars were observed by Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy (EDS) to investigate the location and chemical composition of ASR gel. The results from this study showed satisfactory level of pozzolanic reactivity when cement was partially replaced by meta-halloysite. It was demonstrated that a 20% addition of metahalloysite are able to mitigate ASR and lower expansion of mortar bars with reactive aggregate to a safe level of not more than 0.1% at 14 days. Microstructural observations of the specimens containing meta-halloysite indicated the presence of a calcium-alkali-silicate-hydrate gel. But fewer reaction products and with different composition than those forming in the pastes without mineral additives are present.

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The Study on Metakaolin's Effect of Restraining the Alkali-Silica Reaction of Slate Aggregate

Cited by 2 publications

References 2 publications

Effect of the Composite of Fly Ash and Slag on Alkali-Silica Reaction

Effect of the Composite of Fly Ash and Slag on Alkali-Silica Reaction

The effect of meta-halloysite on alkali–aggregate reaction in concrete

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