Mineral admixtures in mortars effect of type, amount and fineness of fine constituents on compressive strength

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

doi:10.1016/j.cemconres.2004.07.004

Cited by 160 publications

(68 citation statements)

References 7 publications

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“…The positive contribution of limestone admixture is mainly due to the acceleration of the process of hydration of cement by at youth ages, as well as reducing of the amount of water necessary to the reference consistency by using of superplasticizer. This behavior of limestone at youth ages has been confirmed by several authors [1,4,5,7,8] and can be influenced by the nature of cement and the superplasticizers used [5,6,8,[10][11][12][13][14].…”

Section: Iv31 Compressive Strengths At 07 Daysmentioning

confidence: 62%

“…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%

“…So it follows that the results obtained for concretes with admixtures and super-plasticizer, advanced to meet overall mortars results. Phenomena at the origin of mechanical improvements to 07 days and 28 days resistances have been developed and analyzed in the previous studies and can be renewed for concretes [1][2][3][4][7][8].…”

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: Iv31 Compressive Strengths At 07 Daysmentioning

confidence: 62%

Section: Matec Web Of Conferencesmentioning

confidence: 99%

Section: Matec Web Of Conferencesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Valorization of Local Mineral Admixtures in Concretes

Boudchicha

Gallias

2014

MATEC Web of Conferences

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“…In that sense, the use of active mineral admixtures in concrete fabrication has proven to be a feasible and effective alternative to increase durability properties of such material. It basically occurs because of increased content of reactive products, favored by the additional generation of hydrates in the puzzolanic reaction, which enables lower capillary porosity and, therefore, higher strength and durability (Agarwal, 2006, Lawrence et al, 2005, Papadakis and Tsimas, 2002, Mehta and Monteiro, 2001). …”

Section: Introductionmentioning

confidence: 99%

Estudio de la adición de arcillas calcinadas en la durabilidad de hormigones

Lara

Antoni²,

Díaz

et al. 2011

Rev. ing. constr.

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Estudio de la adición de arcillas calcinadas en la durabilidad de hormigones * Universidad Central de Las Villas, Santa Clara, Cuba ** Escuela Politécnica Federal de Lausana (EPFL), SUIZA Resumen Actualmente son bien conocidas las ventajas económicas y medioambientales de la sustitución del clínker de cemento por otros materiales cementicios suplementarios. Las arcillas calcinadas en forma de metacaolín han recibido por ejemplo especial atención en años recientes. Se conoce que estas adiciones, cuando se añaden a morteros y hormigones, mejoran tanto su resistencia mecánica como su durabilidad. El objetivo de este trabajo es evaluar el comportamiento de las propiedades físico-mecánicas y la durabilidad en microhormigones, empleando arcillas calcinadas y molidas como material sustituyente del 30% en peso del cemento Pórtland ordinario (CPO). Para ello se utilizó una tierra arcillosa, compuesta principalmente por mineral caolín de bajo grado de pureza, para la obtención de arcillas calcinadas como minerales cementicios suplementarios. Los mejores resultados se resistencia a la compresión a los 28 días se obtuvieron para la arcilla sedimentada y calcinada, la cual posee mayor contenido de mineral caolín debido a un proceso de purificación por sedimentación de la materia prima acometido sólo para esta adición. Sin embargo, los ensayos de absorción de agua por capilaridad arrojaron los mejores resultados para el suelo arcilloso calcinado, el cual posee una elevada finura en comparación al resto de los materiales estudiados. Los menores valores mostrados por esta adición, tanto de porosidad capilar como de sorptividad, indican que existió un predominio del fenómeno de la compacidad e impermeabilidad, lograda en la matriz cementicia al usar un material tan fino, por encima del efecto de la reacción puzolánica. Estudios en la microestructura del gel de C-S-H, usando energía dispersiva por rayos-X (EDX), demostraron como el empleo de arcillas calcinadas en sustitución del CPO favorece la formación de productos de hidratación más estables, principalmente monosulfos del tipo hemicarbo y monocarbo, lo cual es conveniente para el hormigón ante la posible acción de diferentes mecanismos de degradación.Palabras Clave: Arcillas calcinadas, durabilidad, absorción capilar, porosidad, productos de hidratación Abstract Currently economical and environmental advantages of cement clinker replacement by other supplementary cementious materials are well known. For example calcined clays, such as metakaolin, have drawn special attention during recent years. It is well known that these admixtures added to mortars and concretes improve mechanical strength as well as durability. The purpose of this study is to evaluate the behavior of physical-mechanical properties and durability in micro-concretes, by employing calcinated and grinded clays as replacement material, by 30% of ordinary Portland cement (OPC). Therefore, clay soil was employed, which is mainly composed by low-purity-kaolin mineral, so as to obtain calcined clays to be used as s...

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Effects of the Chemical Composition of Synthetic Slags Compared to an Average Blast Furnace Slag

Schnürer,

Machner

2023

ce papers

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To study the effect of the main oxides and the minor components in slags on their reactivity as SCM, various glasses were synthesized to stepwise imitate a commercial slag of average chemical composition. First, a glass was produced from the main oxides CaO, Al2O3 and SiO2. In a second step, the minor components MgO, Fe2O3, Na2O and K2O were added separately to the main oxide mix. A selection of two synthetic glasses was tested for their compressive strength contribution (up to 90 days) by substituting 20 wt.% of cement. After all testing times, the synthetic slags achieved a strength similar to that of the commercial product. The reactivities determined by heat flow calorimetry (R3 test) correlate with the calculation of NBO/T and the results of 29Si MAS NMR showing that a decreased degree of polymerization enhances the reactivity. Apart from that, FTIR spectroscopy and 27Al MAS NMR indicate a similar structure of the original and the synthetic slags.

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Mineral admixtures in mortars effect of type, amount and fineness of fine constituents on compressive strength

Cited by 160 publications

References 7 publications

Valorization of Local Mineral Admixtures in Concretes

Valorization of Local Mineral Admixtures in Concretes

Estudio de la adición de arcillas calcinadas en la durabilidad de hormigones

Effects of the Chemical Composition of Synthetic Slags Compared to an Average Blast Furnace Slag

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