High temperature material properties of calcium aluminate cement concrete

Khaliq, Wasim; Khan, Hammad Anis

doi:10.1016/j.conbuildmat.2015.07.023

Cited by 153 publications

(75 citation statements)

References 25 publications

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“…While, after exposed to 250 o C, it can be seen that the APECA were melted and filled the microcrack as shown in Figure 5b. The second results contrary to Wasim Khaliq and Hammad Anis Khan [11] that found the development of micro-crack on concrete after exposed by high temperature in the range of 200ºC to 600ºC. In general, the micro-crack size in concrete reduced after being heated with temperature due to the APECA melted at temperatures above 160 o C [2,4].…”

Section: -P4contrasting

confidence: 48%

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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Section: -P4contrasting

confidence: 48%

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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“…19,21 These may be the reasons for the least Lorm at 400-600 C. . With the increase of temperature, the adsorption capacity of THACs uctuated.…”

Section: 20mentioning

confidence: 99%

“…16,17 At a temperature below 300 C, the HAC is very sensitive to the temperature, and free water is lost by evaporation as well as C 2 AH 8 converted to 3CaO$Al 2 O 3 $6H 2 O (C 3 AH 6 ), leading to the increase of porosity and the decline of structural stability. 18,19 Aer exposure to 400-600 C, slowly excessive dehydration of C 3 AH 6 and Al(OH) 3 occurred, leading to the formation of 12CaO$7Al 2 O 3 (C 12 A 7 ).…”

Section: Effect Of Thermal Activation Temperaturementioning

confidence: 99%

Phosphate adsorption onto thermally dehydrated aluminate cement granules

et al. 2018

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Phosphorus is the main element for eutrophication of water bodies. Aluminate cement is a cheap building material rich in aluminium and calcium which have significant effects on phosphate adsorption. This study aimed at the investigation of removal behavior of phosphate by thermally dehydrated aluminate cement granules, treated at different temperatures, and the adsorption mechanisms. It was found that 600 C was the optimal temperature, producing excellent granules with a particle size of 0.6-1.5 mm (T600), giving a great adsorption capacity of phosphate of 49.1 mg P per g and presenting fast and high initial adsorption, reaching a capacity of 23.7 mg P per g within 30 min at 20 C. The phosphate adsorption process was dominated by chemical adsorption, mainly through inner-sphere complexion and phosphate precipitation on the surface of the adsorbent. Compared with other phosphate adsorbents, T600 may be an economical and efficient adsorbent.

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“…To evaluate the postfire residual mechanical performance of concrete specimens containing RHA and BA after exposure to elevated temperatures, heating, and testing based on residual test procedure were adopted . For evaluation and comparison of residual mechanical properties namely, compressive and splitting tensile strength, compressive stress–strain response, elastic modulus, and mass loss of RHSC, BHSC, and CHSC, a total of 69 specimens (23 for each concrete type) were tested after exposure to various temperatures.…”

Section: Methodsmentioning

confidence: 99%

Effect of processed pozzolans on residual mechanical properties and macrostructure of high‐strength concrete at elevated temperatures

Khaliq

Mujeeb

2018

Structural Concrete

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Recently, use of processed pozzolans such as rice husk ash (RHA) and bagasse ash (BA) have been identified as promising mineral admixtures to produce HSC. As fire is considered one of the severe hazards to which a structure may be exposed, there is a requirement to evaluate the performance of HSC containing pozzolanic admixtures, namely, RHA and BA at elevated temperatures. In this study, the residual mechanical properties comprising, compressive and splitting tensile strength, compressive stress-strain response, and static elastic modulus of HSC mixtures made with 10% RHA, 10% BA as cement replacement are presented. The properties were investigated at different temperatures up to 800 C, at a slow heating rate of 3 C/min. Results reveal that the residual mechanical properties of pozzolanic concretes deteriorate at elevated temperatures with significant loss above 200 C. Visual observations of the physical deterioration reveal that the cracking in specimens mostly initiates during the cooling phase and develops extensively in all concrete types at exposure temperature of above 400 C. K E Y W O R D S amorphous silica, high temperature, macrostructure, mechanical properties, mineral admixtures, pozzolanic activity

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High temperature material properties of calcium aluminate cement concrete

Cited by 153 publications

References 25 publications

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

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

Phosphate adsorption onto thermally dehydrated aluminate cement granules

Effect of processed pozzolans on residual mechanical properties and macrostructure of high‐strength concrete at elevated temperatures

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