Microstructure of pre-wetted aggregate on lightweight concrete

Lo, Tommy Y.; Gao, Xinyu; Jeary, Alan

doi:10.1016/s0360-1323(98)00060-2

Cited by 55 publications

(35 citation statements)

References 4 publications

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“…3c). Temperature gradients inside the molten aggregate during the heating process have been demon strated by previous studies [22] and the above-mentioned struc tures could be the result of these gradients. The highest temperature is reached in the inner core, as the material appears vitrified (contrary to the external layer, which does not).…”

Section: Sem Resultsmentioning

confidence: 94%

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Microstructure and mineralogy of lightweight aggregates produced from washing aggregate sludge, fly ash and used motor oil

González-Corrochano

Alonso-Azcárate

Rodas

et al. 2010

Cement and Concrete Composites

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Section: Sem Resultsmentioning

confidence: 94%

“…Litcon [22]), all the types, except for variety B of 3.F(3)-1175-1O (Fig. 1b) and some specimens of 3.F(2)-1200-15 and 3.F(2)-1225-1O/1 5, are rounded in shape and reasonably isodiametric.…”

Section: Particle Shape and Surface Texturementioning

confidence: 99%

Microstructure and mineralogy of lightweight aggregates produced from washing aggregate sludge, fly ash and used motor oil

González-Corrochano

Alonso-Azcárate

Rodas

et al. 2010

Cement and Concrete Composites

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“…(ii) The mineralogical analysis reveals that the main crystalline phases identified in LW As manufactured with sewage sludge are quartz (Si0 2 ) and neo-formed anorthite (CaAhShOs). Neo-formed ferroan diopside (Ca[Mg,Fe]Sh06) and gehlenite (CazAhSi0 7 ) are also recorded in the XRD patterns. In LWAs with washing aggregate sludge and clay-rich sediment, the -Microstructure -bloating index: the absence of formation of a vitrified layer with an increased temperature could influence a progressive decrease of the BI.…”

Section: Discussionmentioning

confidence: 99%

“…The water absorption of lightweight aggregates is usually higher than that of normal aggregates. This high absorption rate can easily produce micro-cracking in the aggregate/cement interface during the early hydration stage [7]. (iii) a near-spheroid shape, in order to improve the properties of fresh concrete.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mineralogy of lightweight aggregates manufactured from mining and industrial wastes

González-Corrochano

Alonso-Azcárate

Rodas

et al. 2011

Construction and Building Materials

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Keywords:Lightweight aggregate Microstructure MineralogyThe microstructure and mineralogy of lightweight aggregates manufactured with washing aggregate sludge, sewage sludge and a clay-rich sediment have been studied. The mineralogical analysis revealed the neo-formation of plagioclase and pyroxene group minerals and a minor presence of gehlenite. Some relationships may be established: (i) heating temperature and dwell time affect the formation of new porosity; (ii) the disappearance of pyroxenes could produce changes in the density of the solid material in the lightweight aggregates; (Hi) when an external glassy film is not present, water absorption values depend on the size and number of each type of pore.Washing aggregate sludge Sewage sludge Clay-rich sediment

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“…이를 해결하기 위하여 경량골재의 사용이 제시되고 있 으나, 경량골재의 내부공극으로 인해 골재의 흡수율이 증 가하고 [1,2] 콘크리트의 압축강도를 저하시키며 워커빌리 티에 악영향을 미치며 [3], 특히 경량골재의 내부공극을 통한 탄산가스 유입으로 인해 경량골재콘크리트는 보통 콘크리트에 비해 탄산화가 더 빠르게 진행되는 문제점이 있다 [4].…”

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A Study on Carbonation Resistance of Concrete Using Surface-coated Lightweight Aggregates

Eom¹,

Jeong²,

Kim³

2014

Journal of the Korea Institute of Building Construction

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The purpose of this study is to investigate the mechanical properties and carbonation resistance of concretes using lightweight aggregate coated surface finishing materials. To evaluate the mechanical properties and carbonation resistance of concrete, slump, air amount, air-dried unit volume weight, compressive strength, and carbonation depth are tested. In terms of the unit volume weight of concrete, air-dried unit volume weight of concrete using coating lightweight aggregate was measured as 1,739～1,806kg/m 3 . When using coating aggregate, compressive strength of concrete at 28 days was measured as much as 82.7～95.9% of the compressive strength using non-coating aggregate. It is found that compressive strength tends to decrease with coating lightweight aggregate. However, all concretes using coating lightweight aggregate except O-LWAC satisfied the criteria for 28-day compressive strength suggested in KS. The measurement of carbonation depth when the water-repellent agent was used found that carbonation depth was reduced by as much as 2.6～6.1%. On the other hand, when using polymer waterproof agent, carbonation depth was reduced by as much as 8.6～12.0%. Consequently, to improve carbonation resistance, polymer waterproof agent was more effective than water-repellent agent. In particular, epoxy showed the most outstanding performance.

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Microstructure of pre-wetted aggregate on lightweight concrete

Cited by 55 publications

References 4 publications

Microstructure and mineralogy of lightweight aggregates produced from washing aggregate sludge, fly ash and used motor oil

Microstructure and mineralogy of lightweight aggregates produced from washing aggregate sludge, fly ash and used motor oil

Microstructure and mineralogy of lightweight aggregates manufactured from mining and industrial wastes

A Study on Carbonation Resistance of Concrete Using Surface-coated Lightweight Aggregates

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