Effect of prewetting methods on some fresh and hardened properties of concrete with pumice aggregate

Kabay, Nihat; Aköz, Fevziye

doi:10.1016/j.cemconcomp.2011.11.022

Cited by 38 publications

(17 citation statements)

References 19 publications

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“…The structural lightweight concretes from Yamanian pumice and scoria using trial mix method with Type II PC content of 500 kg yielded the cube compressive strengths of 29 MPa and 37 MPa [47]. The structural lightweight concrete from Turkish pumice using trial mix method with OPC contents of (320-440) kg and low slump values, ie (35)(36)(37)(38)(39)(40) mm yielded the cylindrical compressive strengths of (19.17-26.09) MPa [34]. Thus it can be showed that structural lightweight concretes obtained from the typical pumice and scoria as coarse aggregates in this study, produced relatively low PPC contents and then they can be more efficient.…”

Section: B MIX Proportions For Structural Lightweight Concretementioning

confidence: 99%

“…The prewetting methods, such as sprinkling, conventional presoaking or vacuum presoaking are used to reduce the high absorption and high absorption rate of coarse aggregates due to its high porosity [24][29] [39]. The use of the chemical water reducer admixture aims to improve the workability at low water-cement ratio in order to the compressive strength remains high [21].…”

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confidence: 99%

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Suitability of Medium-K Basaltic Andesite Pumice and Scoria as Coarse Aggregates on Structural Lightweight Concrete

Suseno¹,

D²,

Wardana³

et al. 2017

IJET

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Abstract-This study presented an optimization of the suitability of medium-K basaltic andesite pumice and scoria as coarse aggregates on structural lightweight concrete. The testing results indicated that these pumice and scoria had a typical characteristic so that they were completely different from those existed previously. Both typical vesicular rocks also fulfilled the requirements of coarse lightweight aggregate. The mix designs of structural lightweight concrete for the specified compressive strengths yielded Portland-Pozzolan Cement (PPC) contents were relatively lower than the previous studies conducted. The property of fresh concrete tests showed that for the specified slump values, the lightweight concrete mixtures can achieved satisfactory workabilities. While the properties of hardened concrete tests showed that almost all equilbrium densities fulfilled the requirements, but three equilibrium densities of scoria lightweight concrete were slightly greater than the requirements so that they were classified as structural semi-lightweight concretes. In addition, the use of typical pumice and scoria as coarse aggregates on that concrete yielded a significant density reduction, ie. approximately 20 %. The compressive strength obtained in the tests conducted can achieved those specified in the mix designs however two pumice structural lightweight concretes did not achieve them. The ultimate strains and modulus of elasticities also remained in proportional values, while the splitting tensile strengths and modulus of ruptures were relatively low when compared with previous studies.Keywords-pumice, scoria, medium-K basaltic andesite, structural lightweight concrete I. INTRODUCTION Studies on structural lightweight concrete using pumice and scoria as a replacement for artificial lightweight aggregate have been carried out in recent years. Artificial lightweight aggregate is a highly profitable manufactory product in lightweight concrete technology. Beside its well-controlled quality, the density reduction of lightweight concrete utilizing this synthetical aggregate can reach about 28 % [29], thereby it affects the structural design results and decreases its overall costs. However, its production process is complicated, requires high thermal energy [21][23] [29] and produces certainly air pollution thus the its product becomes expensive, less energy saving and less environmental friendly. Whereas, both volcanic lightweight aggregates above are abundant in nature so that they produce certain lightweight concretes that are cheaper, conserve energy and more environmental friendly. Furthermore, their applications as aggregate on lightweight concrete have been recommended by [1][6] and they can also be classified as structural lightweight concrete [2]. Unfortunately, their existences are only in certain regions, especially in volcanic regions with characteristics and qualities vary according to the location where both pyroclastic rocks are ejected. Pumice and scoria are glassy volcanic igneous rocks that have abundan...

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Section: B MIX Proportions For Structural Lightweight Concretementioning

confidence: 99%

mentioning

confidence: 99%

Suitability of Medium-K Basaltic Andesite Pumice and Scoria as Coarse Aggregates on Structural Lightweight Concrete

Suseno¹,

D²,

Wardana³

et al. 2017

IJET

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“…Lightweight concrete (LWC) is usually manufactured by adding lightweight aggregates (LWA) into the cementitious matrix. The most widely used LWA are pumice [3], expanded perlite [4][5][6], shale [7][8][9], expanded clay [10], and diatomite [11]. While the incorporation of lightweight materials in cementitious matrix achieves reduced density, traditional LWC and other cementitious composites possess lower mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Lightweight Cement-Based Composites Incorporating Hollow Glass Microspheres: Fresh and Hardened State Properties

Kabay¹,

Kizilkanat²,

Aktürk³

et al. 2022

Teknik Dergi

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This research aims to develop a lightweight cementitious composite with satisfying mechanical and good thermal insulating properties. Two different types of hollow glass microspheres (HGM) were used as lightweight aggregates and were substituted with fine aggregate by 10, 20, and 40% by volume. The rheological, physical, mechanical, and microstructural properties of the resulting HGM-incorporated composites were investigated and correlations were established between physical and mechanical test results. The results showed that the physical and mechanical properties of individual HGM particles play a dominant role in the properties of lightweight mortars. HGM addition provided reductions up to 20% in the density and 45% in the thermal conductivity values of mortars compared to the reference. The best HGM ratio in the tested range was found as 20%, which provides benefits such as reduced density and enhanced thermal insulation capability without causing a significant reduction in compressive strength. It was concluded that HGMs can be used in the lightweight cementitious mortar production which has great potential in building applications to reduce the heating energy consumption.

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“…However, with the different compositional parameters such as types of LWA (fly ash based artificial aggregate, sintering expanded clay, pumice aggregate, or oil palm shell), amount and type of binder, water-to-binder ratio, mineral admixture (silica fume, fly ash), and initial prewetting method for LWA, the shrinkage of LAC may be lower or greater than that of NWC [22][23][24][25][26][27]. Generally, the shrinkage of LACs is reduced by the rigid LWA with higher modulus of elasticity in water saturated condition prewetted and with the greater volume of LWA in the same volume of paste [24][25][26]. And most importantly, in current standard methods, the shrinkage of LAC is usually estimated from the expressions defined for NWC and always gets higher value than those measured in practice [24,28].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Autogenous and Drying Shrinkage of Steel Fiber Reinforced Lightweight-Aggregate Concrete

Zhao

et al. 2016

Advances in Materials Science and Engineering

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Steel fiber reinforced lightweight-aggregate concrete (SFRLAC) has many advantages applied in structural engineering. In this paper, the autogenous shrinkage and drying shrinkage of SFRLAC for up to 270 days were measured, considering the effects of types of coarse and fine aggregates with the changes of water-to-binder ratio and volume fraction of steel fiber, respectively. The properties of mix workability, apparent density, and compressive strength of SFRLAC were also reported and discussed in relation to above factors. Test results show that the development of autogenous and drying shrinkage of SFRLAC was fast within 28 days and tended to be steady after 90 days. The development of autogenous shrinkage of SFRLAC reduced with the increasing water-to-binder ratio and by using the expanded shale with higher soundness and good water absorption, especially at early age within 28 days; the later drying shrinkage was reduced and the development of drying shrinkage was slowed down with the increasing volume fraction of steel fiber obviously; manufactured sand led to less autogenous shrinkage but greater drying shrinkage than fine lightweight aggregate in SFRLAC. The regularities of autogenous shrinkage and drying shrinkage of SFRLAC expressed as the series of hyperbola are analyzed.

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Effect of prewetting methods on some fresh and hardened properties of concrete with pumice aggregate

Cited by 38 publications

References 19 publications

Suitability of Medium-K Basaltic Andesite Pumice and Scoria as Coarse Aggregates on Structural Lightweight Concrete

Suitability of Medium-K Basaltic Andesite Pumice and Scoria as Coarse Aggregates on Structural Lightweight Concrete

Lightweight Cement-Based Composites Incorporating Hollow Glass Microspheres: Fresh and Hardened State Properties

Experimental Study on Autogenous and Drying Shrinkage of Steel Fiber Reinforced Lightweight-Aggregate Concrete

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