Evolution of the microstructure of lime based mortars and influence on the mechanical behaviour: The role of the aggregates

Santos, A. R. Lopes dos; Veiga, Rosário; Silva, António Santos; Brito, Jorge de; Álvarez, J.I.

doi:10.1016/j.conbuildmat.2018.07.223

Cited by 103 publications

(44 citation statements)

References 44 publications

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“…Texture, size, shape, chemical, and mineralogical compositions also affect the mechanical and physical properties of aggregates [59][60][61][62][63][64][65]. The aforementioned characteristics, as well as the degree of alteration, disintegration and deformation of aggregates, affect their quality and thus their suitability for use in various applications.…”

Section: Established Correlations Between Fine Aggregate Propertiesmentioning

confidence: 99%

Correlations between the Properties of Crushed Fine Aggregates

Fournari

Ioannou

2019

Minerals

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Aggregates are essential in the production of composite building materials and their properties and characteristics influence the performance of these materials in use. Nevertheless, despite the existence of several standardized and other methods for testing aggregates, the inherent inhomogeneity of these geomaterials does not permit the establishment of rigid specifications for their quality. Hence, research on aggregate testing and quality control is always timely. This paper presents the results of standardized (soundness, Micro-Deval, sand equivalent, methylene blue, water absorption, and relative density) and non-standardized (PXRD) laboratory tests performed on crushed fine aggregates of different mineralogical composition quarried in Cyprus. From these results, it is evident that the mineralogical composition of aggregates affects their physicomechanical properties. A good correlation was observed between the magnesium sulphate soundness coefficient and the Micro-Deval coefficient. This may lead to the introduction of an alternative test method for the quality testing of fine aggregates at European level. A reasonable correlation was also noted between the methylene blue and sand equivalent test results, despite the fact that the literature does not seem to support such a relationship. No further correlations were observed among the rest of the properties investigated.

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Section: Established Correlations Between Fine Aggregate Propertiesmentioning

confidence: 99%

Correlations between the Properties of Crushed Fine Aggregates

Fournari

Ioannou

2019

Minerals

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“…The porosity is affected by several different influences, mainly the amount of kneading water, and the chemical and mineralogical composition of the aggregate. It is generally acknowledged that the calcareous aggregate (mostly limestone) produces mortars with slightly better parameters in comparison with silicate aggregate [2][3][4][5][6]. However the theories to explain the mechanisms behind are various and even the effects on the porosity of mortars are significantly different in studies with seemingly similar parameters [2,6].…”

Section: Introductionmentioning

confidence: 99%

“…It is generally acknowledged that the calcareous aggregate (mostly limestone) produces mortars with slightly better parameters in comparison with silicate aggregate [2][3][4][5][6]. However the theories to explain the mechanisms behind are various and even the effects on the porosity of mortars are significantly different in studies with seemingly similar parameters [2,6]. The total porosity and the main pore diameter increase in the lime paste with growing water content [7] however, the physico-mechanical properties of aerial lime are reported to be unaffected by the higher porosity, thus being non-compliant with the Power equation generally accepted in the world of hydraulic binders.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of biopolymer-modified aerial lime mortars

et al. 2020

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Cellulose-based viscosity-modifying admixtures are used on daily basis in a wide range of building materials, dominantly in pre-mixed mortar systems. Lately, alternative admixtures such as different “gums” have emerged. In building materials, the gums have similar viscosity-enhancingeffects as cellulose ethers with different efficiency. Various ways of production, as well as diverse working mechanisms of the biopolymers are to be considered while choosing the most suitable admixture for the intended use. Influence of alternative admixtures in several doses on the microstructure of lime mortars was studied in this paper. Mortars were prepared with the same workability and the air content in fresh mortar was determined, for it can have notable impact on microstructure of hardened mortar. Hydroxypropyl derivative of chitosan showed air entraining ability, while the carboxymethyl derivative reported slight decrease in amount of air entrained into the mixture. In the case of diutan gum, the most water-demanding admixture, the percentage of entrained air dropped with growing dose. Admixture addition increased the volume of pores in diameter lower than 0.1 μm, and in region of pores around 10 μm. Only the diutan gum affected the distribution of capillary pores, which are typical for lime mortars. Hygric properties were in correlation with air content values.

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“…These graphs have been formed as a result of mixing the basalt aggregate in a certain ratio (35% powder+65% sand) as a result of its grinding as powder and sand. When Figure 7 is examined, quartz aggregate has been seen to be the closest one to the Fuller curve (assuming a Fuller exponential number of 0.50) accepted as the ideal curve [23,24]. Therefore, it is the aggregate with the highest composition.…”

Section: Resultsmentioning

confidence: 99%

Examination of the Usability of Basalt Aggregate in Sifcon

İpek

2018

CEJ

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In this study, the usability of the quartz and basalt rocks as aggregate in Slurry Infiltrated Fiber Concrete (SIFCON) has been examined. In the study, quartz aggregate has been taken as reference and basalt aggregate has been used as a substitute and separately. The aggregates have been ground and classified in the dimensions of 0-0.1 mm (powder) and 0.1-0.6 mm (sand). The physical properties of the aggregates have been determined and SIFCON slurry has been prepared. The samples produced by this slurry have been conducted to Compressive Strength, Flexural Tensile Strength, Fracture Toughness, Ultrasonic Pulse Velocity, Schmidt Hammer tests. Moreover, unit cost has been examined with the different aggregate usages. Consequently; the highest compressive and flexural strength being respectively 99.75 MPa and 32.01 MPa have been reached with the use of quartz aggregate. The compressive strength of the basalt aggregate is 14% lower than that of the quartz aggregate where, its flexural strength almost remained in the same value. It has been observed that basalt aggregate is more economical in terms of unit strength cost. It is suggested that basalt aggregate could also be used in SIFCON as an alternative to the quartz aggregate.

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Evolution of the microstructure of lime based mortars and influence on the mechanical behaviour: The role of the aggregates

Cited by 103 publications

References 44 publications

Correlations between the Properties of Crushed Fine Aggregates

Correlations between the Properties of Crushed Fine Aggregates

Microstructure of biopolymer-modified aerial lime mortars

Examination of the Usability of Basalt Aggregate in Sifcon

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