Performance of concrete containing crushed brick aggregate exposed to different fire temperatures

Hachemi, Samia; Ounis, Abdelhafid

doi:10.1080/19648189.2014.973535

Cited by 37 publications

(19 citation statements)

References 27 publications

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“…The higher compressive strength for waste clay bricks aggregates depending on the higher content used. For 20% replacing the compressive strength was higher than the normal mix at the same temperature (600 ᵒC) [32]. Waste clay bricks consider stable and one of the best aggregate which can use for resist fire and high temperatures [12].…”

Section: Weight Lossmentioning

confidence: 97%

“…For waste clay bricks replacing fine aggregate, the compressive strength appeared reduction by 11.2% and 9.3% for 10% and 20% respectively. Most of the damage in the mortar at 200 ᵒC resulting in the elimination of free water in addition to the beginning dehydration of calcium silicate hydrated [32]. Utilizing 20% waste glass for replacing sand showed improvement in compressive strength by 5% at 200 ᵒC.…”

Section: Weight Lossmentioning

confidence: 99%

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Sustainable Mortar Made with Local Clay Bricks and Glass Waste Exposed to Elevated Temperatures

2021

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The present study involved assessing the replacement of fine aggregate in the mortar with sustainable local materials like clay bricks and glass included 168 specimens (cubes and prisms). Seven mixtures were cast for this work, one control mix (R1) with 100% natural sand whereas mixes from R2 to R5 have 10% and 20% replacing natural sand with waste clay bricks and waste glass separately and respectively. Mix R6 was included 20% replacing sand with combination waste materials (10% waste clay bricks with 10% waste glass). Mix R7 has involved the same percent of replacing the previous mix R6 but with adding Polypropylene fibers 1% by volume. The samples have put in an electrical oven for one hour at 200, 400, and 600 ᵒC then cooled to room temperature to be tested and compared with samples at normal temperature 24 ᵒC. Different mechanical tests were adopted involved flow tests, density, weight loss, compressive strength, flexural strength, and water absorption. The results at different temperatures were discussed where many findings were specified. The flexural strength at 400 ᵒC was showed improving by 56% for 20% waste clay brick and 69% with 10% waste glass, as well all combination mixes illustrated higher strength than the control. Doi: 10.28991/cej-2021-03091729 Full Text: PDF

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Section: Weight Lossmentioning

confidence: 97%

Section: Weight Lossmentioning

confidence: 99%

Sustainable Mortar Made with Local Clay Bricks and Glass Waste Exposed to Elevated Temperatures

2021

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“…In [ 81 ], tests were performed on concrete made with coarse aggregate made from recycled ceramic exposed to elevated temperatures (200, 400, 600 °C), and the researchers concluded that specimens with replacement with RCCA (coarse aggregate made from recycled ceramic) had improved relative residual strength. Crushed brick aggregate was tested in [ 82 ] by replacing 30% of standard aggregate in concrete mix and exposing it to elevated temperatures. The result proved that concrete made in this way behaves very similarly to the control mix.…”

Section: Concrete Compositionmentioning

confidence: 99%

“…The results showed that the loss of initial strength was lowest for 0.22 (approximately 20%) and higher for 0.33 and 0.57 (approximately 30%). In [ 82 ], research on the w/c ratio was performed by exposing three different concrete mixes, with w/c ratios of 0.6, 0.42, and 0.27, to temperatures ranging from 150 to 900 °C. The heating rate was set at 3 °C/min, and the exposure time at the peak temperature was 1 h. The results show that the smaller w/c ratios perform slightly better and maintain more strength.…”

Section: Concrete Compositionmentioning

confidence: 99%

A Literature Review of Concrete Ability to Sustain Strength after Fire Exposure Based on the Heat Accumulation Factor

Pasztetnik

Wróblewski

2021

Materials

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Concrete is susceptible to damage during and after high-temperature exposure (most frequently in fire). The concrete partial strength re-gain after a high-temperature exposure obtained by the rehydration process is undoubtedly an advantage of this construction material. However, to use fire-damaged concrete, one has to know why the strength deteriorates and what makes the partial re-gain. Within this framework, the paper aims to find what factors influence the strength re-gain. Moreover, an attempt is made to introduce a measure collecting various influences such as the modified heat accumulation factor—accounting only for that which is important for the process, the temperature decomposing cement paste (i.e., above 400 °C). Several factors, i.e., peak temperature, heating time and rate, cooling regime, post-fire re-curing, concrete composition, age of concrete at exposure, porosity, load level at exposure, and heat accumulation are presented by their influence on the relative residual compressive strength, i.e., a portion of initial strength that is obtained after temperature exposure and strength re-gain. Since the relative strength unifies various concretes, a more general assessment and discussion are presented based on the experimental results and correlation factors. As fundamental influences determining the residual strength, the heating time, peak temperature, cooling, or post-heating re-curing regimes are found with the load level at exposure being inadequately examined. This paper also shows the superiority of the modified heat accumulation factor, but the results obtained are not satisfactory, and additional experimental data are necessary to develop a theoretical model of the residual strength.

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“…Concrete is a fairly non-combustible, fire-safe material that resists high temperatures well. Fire nonetheless poses a severe risk to concrete buildings and structures, inducing structural weakening [1] as well as physical changes such as spalling and colour loss [2] attributable to chemical processes governed by material composition and the temperatures reached [3].…”

Section: Introductionmentioning

confidence: 99%

In situ chemical modification of C–S–H induced by CO2 laser irradiation

et al. 2018

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Fire-induced compositional changes lead to strength loss and even failure in cement and concrete. Calcium silicate hydrate (C-S-H) gel, the main product of cement hydration, dehydrates at 25 C to 200 C, while temperatures of 850 C to 900 C alter its structure. A Raman spectroscopic study of the amorphous and crystalline phases forming after CO 2 laser radiation of cement mortar showed that C-S-H dehydration yielded tricalcium silicate at higher, and dicalcium silicate at lower, temperatures. Post-radiation variations were identified in the position of the band generated by Si-O bond stretching vibrations.

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Performance of concrete containing crushed brick aggregate exposed to different fire temperatures

Cited by 37 publications

References 27 publications

Sustainable Mortar Made with Local Clay Bricks and Glass Waste Exposed to Elevated Temperatures

Sustainable Mortar Made with Local Clay Bricks and Glass Waste Exposed to Elevated Temperatures

A Literature Review of Concrete Ability to Sustain Strength after Fire Exposure Based on the Heat Accumulation Factor

In situ chemical modification of C–S–H induced by CO2 laser irradiation

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