The Effect of Repeated Temperature Variations and Freeze Thaw Phenomenon on Some Durability Aspects of Concrete.

Lagrini, Khaoula

doi:10.21474/ijar01/9640

Cited by 1 publication

(5 citation statements)

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“…Studies have been carried out to characterize the Moroccan climate (Khattabi et al. , 2014; Lagrini et al. , 2016) and to determine the areas most sensitive to the effects of temperature change at the level of Morocco (Lagrini et al.…”

Section: Methodsmentioning

confidence: 99%

“…, 2014; Lagrini et al. , 2016) and to determine the areas most sensitive to the effects of temperature change at the level of Morocco (Lagrini et al. , 2019).…”

Section: Methodsmentioning

confidence: 99%

“…Studies have been carried out to characterize the Moroccan climate (Khattabi et al, 2014;Lagrini et al, 2016) and to determine the areas most sensitive to the effects of temperature change at the level of Morocco (Lagrini et al, 2019). According to these studies, average extreme temperatures in Morocco can drop to þ5 8C and reach þ38 8C (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

“…At the level of Morocco, freezing/thawing is nonexistent in most of the territory and low at altitudes above 1,500 m (Lagrini et al, 2019). On the other hand, temperature variation has been identified as a major factor that may affect concrete performance.…”

Section: Durability Of Concrete 533mentioning

confidence: 99%

“…At the level of Morocco, freezing/thawing is nonexistent in most of the territory and low at altitudes above 1,500 m (Lagrini et al. , 2019).…”

Section: Introductionmentioning

confidence: 99%

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Effect of accelerated aging by temperature and moisture variation cycles on the durability of concrete

Houraira

Ouali²,

El-Hammoumi

et al. 2022

IJBPA

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PurposeMorocco is facing climate change, as shown by national studies conducted to date. The purpose of our research work is, on one hand, to develop an experimental protocol; simulating the Moroccan climate, through exposing concretes to accelerated aging in different cycles of temperature variation (+5 to +40 C°) and humidity (60–98% RH) and on another hand, to determine the effect of exposure to temperature and humidity variation cycles on the durability indicators (of concrete [with and without thermal cure]).Design/methodology/approachFor this purpose, three classes of concrete were studied (C35, C40 and C55). Each class of concrete was considered first with no addition of silica fume (SF) and then with a 10% addition of SF. The concrete samples underwent three types of conditioning before performing the tests. The control concretes (Ct) were demoulated after 24 h and stored under stable temperature and humidity conditions (20 ± 2 °C and 80% ± 5 RH). Treated concretes (CV) demouled after 24 h and exposed to 300 cycles of 12 h of temperature and moisture variation in a climate chamber. And finally, concretes that have undergone a heat cure (CTV) for 5 h at 90 °C, were then removed from the mold and exposed to temperature and moisture variations cycles identical to treated concrete (CV).FindingsThe results obtained show that aging accelerated by temperature change, and humidity improves durability indicators compared to Ct. Concretes that have undergone a thermal cure, followed by accelerated aging, show an improvement in durability indicators between 50 and 200 cycles, but the performance of concrete decreases after 200 exposure cycles. The addition of SF plays a beneficial role in the durability of concrete in the three exposure environments.Originality/valueThe originality of the work is, to develop an experimental protocol, simulating the Moroccan climate, through exposing concretes to accelerated aging in different cycles of temperature variation (+5 to +40 C°) and humidity (60–98% RH) and on another hand, to determine the effect of exposure to temperature and humidity variation cycles on the durability indicators of conventional concrete (with and without thermal cure).

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Section: Methodsmentioning

confidence: 99%

“…, 2014; Lagrini et al. , 2016) and to determine the areas most sensitive to the effects of temperature change at the level of Morocco (Lagrini et al. , 2019).…”

Section: Methodsmentioning

confidence: 99%