A preliminary study of blended pastes of cement and quartz powder under the effect of elevated temperature

Rashad, Alaa M.; Zeedan, Sayieda R.

doi:10.1016/j.conbuildmat.2011.10.006

Cited by 61 publications

(19 citation statements)

References 75 publications

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“…The improvement in strength presumably represents the sum of the effects that each component of RCBW has on the composition and structure of hardened AASC paste. Indeed, previous studies have suggested that the main constituents of RCBW are able to improve the strength of hardened AASC paste, with Rashad et al [40] and Rakhimova et al [41] demonstrating the strengthening effect of quartz powder. Interestingly, this is not caused by any effect on the composition of the binder gel, but rather the fact that quartz can act as a nucleation site for reaction products, thereby restricting deformation of the mineral matrix by mechanical constraint and ensuring the formation of a strong interfacial transitional zone between the quartz powder particles and the AASC paste [41].…”

Section: Effect Of Rcbw Composition On the Compressive Strength Of Hamentioning

confidence: 98%

Alkali-activated cements and mortars based on blast furnace slag and red clay brick waste

2015

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Section: Effect Of Rcbw Composition On the Compressive Strength Of Hamentioning

confidence: 98%

Alkali-activated cements and mortars based on blast furnace slag and red clay brick waste

2015

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“…Three major bending at approximately 1010, 1450 -1650 and 3500 cm -1 were observed. The main band appears at 1010 cm -1 wavelength indicates the asymmetric starching of C-S-H structure form in concrete sample and crystallization of quartz [13]. At wavelength of 1450 -1650 cm -1 , it was related to water bound characterized as H-O-H molecule.…”

Section: Resultsmentioning

confidence: 95%

Effect of Rubber Tyre Granules on Concrete Strength and the Microstructure Characteristics of Rubberized Concrete

Jusli

Nor

Ramadhansyah

et al. 2015

AMM

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The influence of using rubber tyre granules (RTG) as aggregates on the strength of concrete and microstructure characteristics of rubberized concrete was investigated in this study. Mix proportion of cement: sand: aggregate: superplasticizer; 1:1.5:1.7:0.003 and 0.47 water cement ratio (w/c) was used. The RTG of size 1-4 mm and 5-8 mm were used throughout this study. Progressive reduction of strength was observed with the increased of RTG percentage and size. Thermogravimetry and differential thermogravimetric (TGA-DTA) analyses were performed to evaluate the decomposition process of materials heated up to 1000 oC. Less reactions the structure bonds are less at the range of 2000-3000 cm-1 wavelength were detected in Fourier Transform Infra-Red (FTIR) analysis due to the stability of the structures developed in concrete samples. In general, the main elements were calcium, carbon, silica and aluminum. The existence of SBR and carbon black of RTG in the sample can be observed by the presents of a carbon peak in EDX.

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“…Accordinly, the performance of -Al 2 O 3 and calcite phases as cementitious binder in sustaining compressive strength was relatively poor. With 80/20 #80/Class F fly ash ratio, the XRD result highlighted the presence of sodium carbonate sodalite (Na 8 CO 3 , let to the intercalating CO 3 into sodalite structure by the replacement of the OH group in sodalite with CO 3 . Thus, the hydroxysodalite possessed a specific property associated with the sequestration of CO 2 , implying that the sodalite-based cementitious materials could be categorized as CO 2 -resistant cement.…”

Section: Xrd and Ft-ir Analysesmentioning

confidence: 99%

“…Such insitu portlandite → lime  hydration phase transformation under a combination of dry and wet conditions is detrimental to the cement's integrity; namely this hydration generates the expansion-caused cracks in the cement body. This undesirable thermal property of OPC containing a certain amount of portlandite can be improved by incorporating quartz (silica flour) into OPC [4][5][6][7][8]. The quartz reacts with portlandite to form additional calcium silicate hydrates, so lowering the amount of portlandite.…”

Section: Introductionmentioning

confidence: 99%

Thermal Shock-resistant Cement

Sugama¹,

Pyatina²,

Gill³

2012

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We studied the effectiveness of sodium silicate-activated Class F fly ash in improving the thermal shock resistance and in extending the onset of hydration of Secar #80 refractory cement. When the dry mix cement, consisting of Secar #80, Class F fly ash, and sodium silicate, came in contact with water, NaOH derived from the dissolution of sodium silicate preferentially reacted with Class F fly ash, rather than the #80, to dissociate silicate anions from Class F fly ash. Then, these dissociated silicate ions delayed significantly the hydration of #80 possessing a rapid setting behavior. We undertook a multiple heating -water cooling quenching-cycle test to evaluate the cement's resistance to thermal shock. In one cycle, we heated the 200C-autoclaved cement at 500C for 24 hours, and then the heated cement was rapidly immersed in water at 25C. This cycle was repeated five times. The phase composition of the autoclaved #80/Class F fly ash blend cements comprised four crystalline hydration products, boehmite, katoite, hydrogrossular, and hydroxysodalite, responsible for strengthening cement. After a test of 5-cycle heat-water quenching, we observed three crystalline phase-transformations in this autoclaved cement: boehmite  -Al 2 O 3 , katoite  calcite, and hydroxysodalite  carbonated sodalite. Among those, the hydroxysodalite  carbonated sodalite transformation not only played a pivotal role in densifying the cementitious structure and in sustaining the original compressive strength developed after autoclaving, but also offered an improved resistance of the #80 cement to thermal shock. In contrast, autoclaved Class G well cement with and without Class F fly ash and quartz flour failed this cycle test, generating multiple cracks in the cement. The major reason for such impairment was the hydration of lime derived from the dehydroxylation of portlandite formed in the autoclaved cement, causing its volume to expand.4

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A preliminary study of blended pastes of cement and quartz powder under the effect of elevated temperature

Cited by 61 publications

References 75 publications

Alkali-activated cements and mortars based on blast furnace slag and red clay brick waste

Alkali-activated cements and mortars based on blast furnace slag and red clay brick waste

Effect of Rubber Tyre Granules on Concrete Strength and the Microstructure Characteristics of Rubberized Concrete

Thermal Shock-resistant Cement

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