Use of a New Approach (Design of Experiments Method) to Study Different Procedures to Avoid Plastic Shrinkage Cracking of Concrete in Hot Climates

Bella, Nabil; Asroun, Aîssa; Aguida, Bella Ilham

doi:10.3151/jact.9.149

Cited by 18 publications

(9 citation statements)

References 15 publications

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“…Following this, the specimens underwent a hot curing process within a controlled chamber, maintaining a temperature of 50℃, a relative humidity of 10%, and an airspeed of 12 km/h for a duration of 24 hours. Further details regarding this procedure can be found elsewhere [28].…”

Section: Specimen Preparation Curing and Testingmentioning

confidence: 99%

Effect of Self-Curing Admixture and Sand Type on the Mechanical and Microstructural Properties of Concrete in Hot Climate Conditions

Benouadah,

Merbouh,

Nabil

et al. 2024

ACSM

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The performance of concrete in hot and arid regions, where summer temperatures typically range between 40 and 50℃, is critically affected by the rapid evaporation of mix water. This study systematically investigates the influence of elevated temperatures characteristic of these climates on both the fresh and hardened properties of concrete, with a focus on formulation variables. Three distinct sand types-calcareous, silicocalcareous, and siliceous-were utilized in conjunction with superplasticizers and curing agents to discern their effects under simulated hot weather conditions. These conditions replicated an ambient temperature of 50℃ for dry materials and water, a wind speed of 12 km/h, and a relative humidity of 10%, to emulate the average shaded environment in desert regions. Workability and compressive strength were evaluated, alongside a microstructural analysis conducted via Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). It was observed that mixtures containing siliceous or silicocalcareous sands exhibited enhanced fluidity, while those with calcareous sand demonstrated superior compressive strength. Microstructural examinations revealed a denser matrix in the calcareous sand-based concrete when compared to its counterparts. Notably, the incorporation of curing compounds and superplasticizers was found to augment the compressive strength, particularly in calcareous sand mixtures, under hot weather conditions. This research offers critical insights into optimizing concrete formulations to mitigate the adverse effects of hot weather concreting, providing a valuable resource for concrete technologists in similar climatic zones.

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Section: Specimen Preparation Curing and Testingmentioning

confidence: 99%

Effect of Self-Curing Admixture and Sand Type on the Mechanical and Microstructural Properties of Concrete in Hot Climate Conditions

Benouadah,

Merbouh,

Nabil

et al. 2024

ACSM

View full text Add to dashboard Cite

show abstract

“…Specimens were then subjected to the hot curing using a controlled chamber (temperature, relative humidity, and air speed were 50°C, 10% and 12km/h respectively) for 24 hours, further details are given elsewhere (Nabil et al 2011).…”

Section: Specimen Preparation Curing and Testingmentioning

confidence: 99%

Effect of self-curing admixture and nature of the sand on the mechanical and microstructural properties of concrete in hot climate condition

Benouadah

Benammar

Belkadi

et al. 2023

Preprint

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Hot climates predominate in many countries of the world. The average summer temperature in hot and desert areas is around 40 to 50°C. Concreting in these regions creates different difficulties in the fresh and hardened properties of the concretes due to the rapid loss of the mixing water by evaporation. In this study, the effects of hot climate and formulation parameters on the fresh and hardened properties of concrete in hot weather were investigated. Three types of sand (calcareous sand, silico-calcareous sand and siliceous sand), presence or not of the superplasticizer and the curing compound were used on fresh concrete surface. The hot weather concrete test parameters are the temperature of the dry materials and the water (50°C) at the time of mixing, thus the air velocity and humidity were set at 12 km/h and 10%, respectively. The properties tested were workability and compressive strength. in addition, the microstructural analysis of the concrete was examined by SEM and XRD. The results showed that the concrete containing calcareous sand revealed a higher compressive strength than the concrete with siliceous or silico-calcareous sands. However, a high fluidity was obtained by concrete based on siliceous or silico-calcareous sands. In hot weather, by using a curing compound and a superplasticizer, the compressive strength of concrete was increased especially for concrete with calcareous sand. This study helps concrete technologists determine the optimum formulation to achieve concrete with desired hot weather properties.

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“…William et al [13] proposed the Plastic Shrinkage Cracking Severity model to predict the plastic shrinkage degree based on the volume of water that evaporates from the concrete between the placing and the initial setting time of concrete, and concluded that the plastic shrinkage could be reduced through decreasing the evaporation rate under an appropriate environment. Bella et al [14] concluded that environmental wind potentially reduces the compressive strength by increasing evaporation compared with the ambient temperature, and that plastic shrinkage could be avoided by taking precautions in the curing phase by using adequate and efficient curing procedures, such as plastic sheets or curing compound, coupled with windbreaks or cooling of the concrete ingredients. Moreover, various fibers were tested and applied for shrinkage reduction [15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Recycled Cement Paste Powder on Early-Age Plastic Shrinkage and Cracking of Cement-Based Materials

Wang¹,

Lü

Wang

et al. 2023

Sustainability

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Cement-based materials, especially those with low water-cement ratios, often experience premature cracking due to plastic shrinkage in the early curing stages. In this study, the development mechanism of early-age plastic shrinkage of cement paste, and the crack shrinkage control effect of recycled cement paste powder on cement paste, was quantitatively investigated using non-contacting two-dimensional digital image technology. The influence of different replacement rates (5%, 10%, 20% and 30%) of recycled cement paste powder on the major principal strain and crack patterns of cement paste was investigated. Furthermore, the mechanism of recycled cement paste powder on the early-age plastic shrinkage of cement-based materials was explored. The results show that the addition of recycled cement paste powder could suppress the early-age plastic shrinkage of cement paste. An appropriate replacement ratio (10%) of recycled cement paste powder shows a 33.3% time delay in crack appearance and a 28.0% reduction in the major principal strain. However, the higher replacement ratio of 30% shows an adverse effect on the major principal strain, with an increase of 35.1%. The core mechanism of the appropriate recycled cement paste powder on plastic shrinkage reduction lies in its porous nature, which allows for water absorption and release and regulates the moisture state inside the pores. This quantitative research of the major principal strain development of the early-age plastic shrinkage of cement paste can facilitate a better understanding of plastic shrinkage reduction in recycled cement paste powder on cement paste.

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Use of a New Approach (Design of Experiments Method) to Study Different Procedures to Avoid Plastic Shrinkage Cracking of Concrete in Hot Climates

Cited by 18 publications

References 15 publications

Effect of Self-Curing Admixture and Sand Type on the Mechanical and Microstructural Properties of Concrete in Hot Climate Conditions

Effect of Self-Curing Admixture and Sand Type on the Mechanical and Microstructural Properties of Concrete in Hot Climate Conditions

Effect of self-curing admixture and nature of the sand on the mechanical and microstructural properties of concrete in hot climate condition

Influence of Recycled Cement Paste Powder on Early-Age Plastic Shrinkage and Cracking of Cement-Based Materials

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