Efficiency of mineral admixtures in mortars: Quantification of the physical and chemical effects of fine admixtures in relation with compressive strength

Cyr, Martin; Lawrence, P.; Ringot, Erick

doi:10.1016/j.cemconres.2005.07.001

Cited by 291 publications

(113 citation statements)

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“…The action of the studied admixtures could cause a decrease or an increase in the consistency of concretes. These favorable or unfavorable effects on the rheological properties of fresh concretes, depended on the nature, quantity and granular characteristics (fineness and morphology) of the admixtures in the mixtures [1,[3][4]9]. In what follows, we used in the reference concretes a quantity of water lower than that required for mixing concretes with admixtures with a favorable granular effect on the rheological properties.…”

Section: Methodsmentioning

confidence: 99%

“…Measurement rounded to the centimeter, characterized sagging. Cubic specimens of 10x10x10 cm 3 were equipped with a system preventing evaporation and stored without being moved for 24 hours in a room with a temperature of 20° C±2°C. After removal, the samples were stored in water at a temperature of 20°C±2 ° C until the time of test.…”

Section: Methodsmentioning

confidence: 99%

“…These occurrences could result in a strength gain interest in the image of concrete without admixtures for which improved resistance can reach 12% for concrete B1-SP without admixtures. Second, this contribution to the compressive strength at 28 days is due to the chemical activity of the admixture itself, which in the case of admixtures of type II, provide significant addition to the strength gain [1][2][3][4][7][8], which can reach up to 24% in concrete B2 with cumulative use of (BFS) admixture and super-plasticizer SP at 20% of the rate of cement substitution. The positive contribution of (BFS) is mainly due to its latent hydraulic properties.…”

Section: Matec Web Of Conferencesmentioning

confidence: 99%

“…Previous released studies showed that the combined use of mineral admixtures and super-plasticizers in mortars can generate certain modifications on the rheological and mechanical behaviors of cementing materials in the fresh and hardened states [1][2][3][4][5][6][7]. These modifications depend on several parameters such as, the nature, quantity and fineness of the incorporated admixture, as well as nature of cements and super-plasticizers used [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Valorization of Local Mineral Admixtures in Concretes

Boudchicha

Gallias

2014

MATEC Web of Conferences

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Abstract:This study is an extension of previous researches on mortars with mineral admixtures and superplasticizers. In this way, the same methodology was applied to concretes and the use of mineral admixture was limited to low cost materials available in Algeria as limestone, pozzolan and blast furnace slag, with current cement and super-plasticizer. The experimental methodology used was based on the volume substitution of the cement by admixtures in mixtures with the absolute volume of the solid phases and workability preserved constant. The main results achieved showed that the super-plasticizer demand of concretes depends on the nature and the quantity of the incorporated admixture. The combined use of admixtures and super-plasticizer has generally a favourable effect on compressive strengths at 07 and 28 days at low rates of cement substitution, which vary significantly with the nature, fineness and quantity of the used admixtures. At 07 days, limestone admixtures give better improvements and reach more than 20 % of gain to the compressive strength of the reference concrete with no admixtures or super-plasticizer, at 10 % of the cement substitution and still better until 30 %. At 28 days, blast furnace slag admixtures give better improvements at 28 days and reach more than 20 % of gain to the compressive strength of the reference concrete at 20 % of the cement substitution and still better until 30 %. This contribution to the compressive strength is explained on the one hand by the reduction of the quantity of water in the mixtures at the same consistency, by the use of the super-plasticizer and on another hand by the activity of Limestone admixtures at early ages and to the latent hydraulic properties of blast furnace slag at 28 days.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Matec Web Of Conferencesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Valorization of Local Mineral Admixtures in Concretes

Boudchicha

Gallias

2014

MATEC Web of Conferences

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“…Fly ash particles can accelerate the cement hydration kinetics by heterogeneous nucleation and surface absorption effects [5,6]. Moreover, fly ash exhibits a pozzolanic activity, and soluble Al 2 O 3 and SiO 2 can participate in the pozzolanic reaction to generate calcium silicate hydrate and calcium aluminate hydrate [7].…”

Section: Introduction C Ement Paste Backfilling (Cpb) For Coal Min-mentioning

confidence: 99%

Effects of Fly Ash Content on Properties of Cement Paste Backfilling

Qi¹,

Feng²,

Zhāng³

et al. 2015

JRST

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ABSTRACT:Fly ash has been considered as an ideal raw material component of cement paste backfilling (CPB) due to its good pozzolanic activity. In this study, the effects of fly ash content (340-420 kg/m 3 ) on the compressive strength, resistivity and microscopic characteristics of CPB were investigated. The results indicated that at the early curing age, the resistivity decreased with increasing fly ash content, while the compressive strength did not vary significantly; at the curing times of 7 d, 14 d and 28 d, the compressive strength exhibited an increasing trend because of the higher content of reaction products and the compaction of pore structure, and the resistivity also increased due to the decreased ionic concentrations of pore solution and the greater resistance to transporting current through the pore network system. Apparently, there existed a linear relationship between the compressive strength and the resistivity of CPB samples.

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Effect of brick powders of various purities on hydration and compressive strength of Portland cement

Grosser,

Schnürer,

Heisig

et al. 2023

ce papers

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The availability of common supplementary cementitious materials (SCMs), as slags and fly ashes, is expected to reduce in the future. Among potential new SCMs, brick powders (BPs) have gained considerable attention. To study the effect of BPs as potential SCMs three BPs of different contamination were used for the experiments. The investigations included the R3 test as well as isothermal heat flow calorimetry and compressive strength measurements up to 91 days. In all tests, fly ash (FA) and limestone powder (LS) were used as a comparison. The reactivities determined in the R3 test could be explained by examining the chemical, mineralogical and physical properties of the BPs. Based on their reactivity in the R3 test, the BPs could be classified as pozzolanic, less reactive SCMs, with BPN showing the highest reactivity among the BPs. The results of the compressive strengths and the heat flow calorimetry confirm the reactivities determined in the R3 test. Based on the obtained results, BPN shows the highest potential for application as an SCM.

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Efficiency of mineral admixtures in mortars: Quantification of the physical and chemical effects of fine admixtures in relation with compressive strength

Cited by 291 publications

References 4 publications

Valorization of Local Mineral Admixtures in Concretes

Valorization of Local Mineral Admixtures in Concretes

Effects of Fly Ash Content on Properties of Cement Paste Backfilling

Effect of brick powders of various purities on hydration and compressive strength of Portland cement

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