Mechanical, hydration, and durability modifications provided to mortar made with crushed sand and blended cements

Meziane, El-Hadj; Ezziane, Karim; Kenaï, Saïd; Kadri, Abdelkader

doi:10.1080/01694243.2015.1048931

Cited by 14 publications

(8 citation statements)

References 37 publications

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“…Les quantités et dosage pour chaque mélange sont donnés dans le tableau 2. Les essais de résistance en compression ont été réalisés sur des éprouvettes cubiques 100×100×100 mm 3 . Les éprouvettes testées ont été conservées dans l'eau dès leur démoulage jusqu'à l'échéance concerné (Fig.2).…”

Section: Essais Réalisésunclassified

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Study of the resistance, porosity, and migration of chloride ions of BAPbased crushing sand

Smain

Kamali-Bernard²,

Kenaï

et al. 2018

MATEC Web Conf.

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Abstract. Self-compacting concretes (SCC), are hyper-fluid concretes, placed without vibration and are considered as one of the most important innovations of the last decade in construction. SCCs offer many advantages, due to their exceptional characteristics of flow and filling of formwork. Their compositions require a large quantity of fines in order to limit bleeding and segregation. Hence, the use of crushed sand (SC), rich in limestone fines (CF) in the manufacture of self-placing concretes (SCC), can be considered as an alternative source of fillers. These sands reduce the cost of SCC by reducing the high demand for fillers on the one hand and on the other hand, obtaining SCC with good physical and mechanical properties. The main purpose of this paper is to examine the effect of different percentages (0, 5, 10, 15, and 20%) of (CF) in crushed sand on SCC performance. The evolution of the compressive strength, the porosity accessible to water and the migration coefficient of the chloride ions were evaluated. The Okamura method was used for the formulation of all SCC mixtures. Sand/mortar (S/M), water/cement (W / C) ratios and superplasticizer content were kept constant. The results show that (CF) reduce the compressive strength but contribute to the reduction of porosity and migration of chloride ions.

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Section: Essais Réalisésunclassified

“…Les travaux de recherches menés sur des mortiers ou bétons montrent l'effet bénéfique des fines sur leurs comportements [1][2][3][4]. Cependant ces études montrent que les interactions multiples et imprévisibles qui peuvent exister entre les fillers et les autres constituants peuvent entraîner des comportements inattendus.…”

Section: Introductionunclassified

Study of the resistance, porosity, and migration of chloride ions of BAPbased crushing sand

Smain

Kamali-Bernard²,

Kenaï

et al. 2018

MATEC Web Conf.

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“…En total cinq mélanges ont été préparés. Les essais de résistance en compression ont été réalisés sur des éprouvettes cubiques 100×100×100 mm 3 . Les éprouvettes testées ont été conservées dans l'eau dès leur démoulage jusqu'à l'échéance concerné (Fig.2).…”

Section: Essais Réalisésunclassified

Study of the resistance, porosity, and migration of chloride ions of BAPbased crushing sand

Smain

Kamali-Bernard²,

Kenaï

et al. 2018

MATEC Web Conf.

View full text Add to dashboard Cite

Self-compacting concretes (SCC), are hyper-fluid concretes, placed without vibration and are considered as one of the most important innovations of the last decade in construction. SCCs offer many advantages, due to their exceptional characteristics of flow and filling of formwork. Their compositions require a large quantity of fines in order to limit bleeding and segregation. Hence, the use of crushed sand (SC), rich in limestone fines (CF) in the manufacture of self-placing concretes (SCC), can be considered as an alternative source of fillers. These sands reduce the cost of SCC by reducing the high demand for fillers on the one hand and on the other hand, obtaining SCC with good physical and mechanical properties. The main purpose of this paper is to examine the effect of different percentages (0, 5, 10, 15, and 20%) of (CF) in crushed sand on SCC performance. The evolution of the compressive strength, the porosity accessible to water and the migration coefficient of the chloride ions were evaluated. The Okamura method was used for the formulation of all SCC mixtures. Sand/mortar (S/M), water/cement (W / C) ratios and superplasticizer content were kept constant. The results show that (CF) reduce the compressive strength but contribute to the reduction of porosity and migration of chloride ions.

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“…Shi et al [3] have confirmed that when NS sand is replaced by QWS sand, concrete slump decreases according to the QWS sand content. This decrease is justified by the increase in the rate of fine limestone powder contained in this sand regardless of the type of cement used [4]. On the other hand, it has been found that the use of QWS sand instead of NS sand leads to a reduction in water and superplasticizer requirement [5].…”

Section: Introductionmentioning

confidence: 99%

“…The packing density of cementitious materials is an important factor that governs the behavior of the mixture in the fresh state and in the hardened state [7]. Also, some researchers have noticed that there is an optimal rate of substitution of NS sand by crushed sand which gives the concrete better compactness and consequently higher compressive strength values [4,8]. According to Westerholm et al [9], the elastic limit and the plastic viscosity of the mortar for different fine aggregates increase respectively from 96 Pa to 550 Pa and from 1.3 Pa.s to 8.8 Pa.s.…”

Section: Introductionmentioning

confidence: 99%

The impact of supplementary cementitious materials on the rheological and mechanical properties of mortars based on quarry waste sand

Nabil,

Amer,

M’hamed

et al. 2024

SEES

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Mineral substances used as additives in cement plants or as additives in the making of concrete contribute through their physical, hydraulic, and pozzolanic activity to improving the behavior of cements in both the fresh and hardened states. Several types of additions are well known, such as natural pozzolans, fly ash, blast furnace slag, and silica fume. These products become more active in the alkaline solutions of cement and give rise to new hydrates that impart greater mechanical strength and better durability to concretes. Through their surface activity and granular distribution, they play a fundamental role in the rheological and mechanical behavior of mortars and concretes. Quarry waste sand (QWS) is generally stockpiled to be eventually sold at very low prices. For this reason, its use in the production of concrete and mortar is increasingly becoming a necessity to protect the environment and meet the needs of the construction and public works sector.This study aims to investigate the effect of using both supplementary cementitious materials (SCM) and quarry waste sand(QWS) to improve some properties of mortar. Ordinary cement is replaced by 10%, 20% and 30% of silica fume (SF), natural pozzolan (NP) or ground blast-furnace slag (GBFS) by weight and the properties of the QWS sand -based mortar are compared to those of natural sand (NS) based mortar. In this study, the slump, superplasticizer requirement, rheological parameters, mechanical strength, and water absorption are investigated. The results obtained show that QWS sand mix has the best workability and requires less superplasticizer dosage. When SCM were used, a drop-in workability is shown and more superplasticizer is required. Also, QWS sand makes the mortar strength 2 and 1.5 times higher than that of NS and becomes 42% higher with 10% SF. Adequate relationships have been established to predict mechanical strengths as a function of test parameters with high correlation coefficient and low root mean square error.

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Mechanical, hydration, and durability modifications provided to mortar made with crushed sand and blended cements

Cited by 14 publications

References 37 publications

Study of the resistance, porosity, and migration of chloride ions of BAPbased crushing sand

Study of the resistance, porosity, and migration of chloride ions of BAPbased crushing sand

Study of the resistance, porosity, and migration of chloride ions of BAPbased crushing sand

The impact of supplementary cementitious materials on the rheological and mechanical properties of mortars based on quarry waste sand

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