Effect of temperature on the physico-mechanical and mineralogical properties of Homra pozzolanic cement pastes

Heikal, Mohamed

doi:10.1016/s0008-8846(00)00403-8

Cited by 93 publications

(49 citation statements)

References 3 publications

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“…The bulk density of all cement pastes decreases from 105 to 250 o C, due to the removal of free, adsorbed and some of combined water which leads to microcracks as well as increases the opening of the pore system of cement pastes. From 250 up to 800 o C the bulk density increases due to the additional hydration products as well as a result of the so-called internal autoclaving [42]; it is also due to the associated shrinkage from the removal of H 2 O and CO 2 to give a dense structure [43]. Evidently, the bulk density decreases with MK content, due to the relatively higher water of consistency of MK cement pastes.…”

Section: Bulk Densitymentioning

confidence: 99%

Hydration Kinetics and Fire Resistance of Recycled Low Grade Alumino-silicate Refractory Bricks Waste-metakaolin Composite Cement Pastes

2017

Egypt. J. Chem.

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Section: Bulk Densitymentioning

confidence: 99%

Hydration Kinetics and Fire Resistance of Recycled Low Grade Alumino-silicate Refractory Bricks Waste-metakaolin Composite Cement Pastes

2017

Egypt. J. Chem.

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“…It is clearly explained by [8] that the high temperature generated the alteration of mechanical properties of concrete due to chemical/physical transformations of aggregate and paste by temperature. Further, the concrete is very risk when it is exposed by fire because concrete is not stable at high temperatures and the concrete can dehydrate [9,10]. …”

Section: Compressive Strength Of 6% Apeca Concrete Exposed By Differementioning

confidence: 99%

The Potential of Artificial Polyethylene Coarse Aggregate (APECA) on Compressive Strength of Concrete After Exposed by Temperatures

Mokhatar

Hadipramana

Isa

et al. 2016

MATEC Web of Conferences

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Abstract. The strength contribution of Artificial Polyethylene Coarse Aggregate (APECA) as a coarse aggregate replacement in concrete are explored. The compression tests is carried out on twenty-one specimens of concrete cube with 0%, 3%, 6%, and 9% of APECA by utilizing two stages: The concrete specimens containing 6% of APECA as coarse aggregate are heated at different temperatures, the strength of concrete mixes with 0%, 3%, 6% and 9% APECA were compared under normal condition (un-heated) and after exposed by 250ºC. Based on literatures, 6% of APECA had an optimal percentage that contribute to the compressive strength of concrete compared to 0%, 3%, and 9% of APECA concrete. Thus, 6% ratio of APECA concrete was applied for continuous observation, which applied various temperatures at 150ºC, 200ºC, and 250ºC. As results, it is observed that the 6% APECA concrete at 150ºC had the highest compressive strength than other temperature (200ºC and 250ºC). Also, it is found that the APECA concrete strength decrease as exposed by higher temperature. However, Scanning Electron Microscope (SEM) results reveals that the APECA melting in the concrete and filled the micro-crack of concrete. It can be concluded that, the APECA has the potential to be a coarse aggregate replacement and more detailed investigations are however demanded to modify the APECA in order to increase its physical properties.

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“…For instance, actual chemical composition is dependent on many variables, such as the nature of raw-material and impurities, among others (Mechling et al 2009;Papadakis and Tsimas 2005;Sahu and Thaulow 2004;Heikal 2000). The use of supplementary material, intentionally added to cement, will be discussed later.…”

Section: Terminology Chemical Aspects and Hydrationmentioning

confidence: 99%

Cement industry: sustainability, challenges and perspectives

2010

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Effect of temperature on the physico-mechanical and mineralogical properties of Homra pozzolanic cement pastes

Cited by 93 publications

References 3 publications

Hydration Kinetics and Fire Resistance of Recycled Low Grade Alumino-silicate Refractory Bricks Waste-metakaolin Composite Cement Pastes

Hydration Kinetics and Fire Resistance of Recycled Low Grade Alumino-silicate Refractory Bricks Waste-metakaolin Composite Cement Pastes

The Potential of Artificial Polyethylene Coarse Aggregate (APECA) on Compressive Strength of Concrete After Exposed by Temperatures

Cement industry: sustainability, challenges and perspectives

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