Effect of Prewetted Pumice Aggregate Addition on Concrete Properties under Different Curing Conditions

Kabay, Nihat; Kizilkanat, Ahmet B.; Tüfekçi, M. Mansur

doi:10.3311/ppci.7767

Cited by 11 publications

(3 citation statements)

References 27 publications

(17 reference statements)

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“…The main observation is that the bulk density values of cement pastes containing pumice are less than those of control paste (mix I) and the difference between them increases as the pumice content in the blended pastes increase. This result may be attributed to the partial replacement of cement by a lighter blender [37]. Evidently, all tested specimens incorporated with Ni 2+ or Co 2+ ions showed higher and/or comparable bulk densities values at 1 and 28 days of hydration compared to those of the corresponding hardened pastes free from these ions.…”

Section: Bulk Density and Total Porositymentioning

confidence: 79%

Utilization of OPC-Pumice composites for efficient heavy metals removal

Amin

Hashem

El-Gamal

2018

Journal of Taibah University for Science

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The immobilization effect of 1 and 3 mass % of Ni 2+ or Co 2+ ions on the hydration reaction of ordinary Portland cement (OPC) and ordinary Portland cement blended with 5 and 15 mass % pumice was investigated. This was done by studying the bulk density, total porosity, compressive strength as well as identifying the phase composition of the formed hydrates using X-ray diffraction (XRD) technique. In addition, leaching behaviour of Ni 2+ and Co 2+ ions was examined up to 90 days using static leaching technique. The results indicated that the incorporation of these ions causes a notable retardation for the early hydration of the OPC. This effect is more noticeable in presence cobalt ions. Besides, the retarding effect was increased by increasing the percentage of heavy metal ions incorporated in the hydrated matrix. However, for OPC-pumice blended cement pastes, the existence of Ni 2+ or Co 2+ ions resulted in an enhancement in the compressive strength values during the hydration period from 3-28 days to be comparable with the values of neat OPC pastes. This enhancement is attributed to the interaction of these ions with pumice which increases the heavy metal fixation.

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Section: Bulk Density and Total Porositymentioning

confidence: 79%

Utilization of OPC-Pumice composites for efficient heavy metals removal

Amin

Hashem

El-Gamal

2018

Journal of Taibah University for Science

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“…The porous structure of pumice is due to the formation of bubbles or air voids when gases contained in the molten lava flowing from volcanoes are entrapped on cooling [23]. About 40% of world pumice reserves are present in Turkey [24] which provides several opportunities for its efficient utilization in concrete generally as a lightweight aggregate [25][26][27][28] or as a cement replacement material [23,24,29,30].…”

Section: Introductionmentioning

confidence: 99%

Pumice as Precursor in Geopolymer Paste and Mortar

Kabay¹,

Mert²,

Miyan³

et al. 2021

J. Civ. Eng. Constr.

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Natural rocks of magmatic origin are alternative precursors in alkali-activated materials and provide opportunities in the search for more environmentally friendly binders compared to portland cement. The pumice is one of these rocks and its amorphous structure and chemical composition make it one of the candidates as a precursor in producing geopolymer binder when finely ground. Since the majority of the pumice reserves are located in Turkey increases its potential utilization in this area, even more. This paper evaluates the physical, mechanical, and microstructural properties of geopolymer pastes and mortars manufactured with pumice powder (PP) and ground granulated blast furnace slag (BFS) with the activating agents sodium hydroxide (NaOH), potassium hydroxide (KOH), and sodium silicate (SS) solution. The experimental results showed that the compressive strength of the geopolymer pastes was mainly affected by the activator concentration and the PP ratio, rather than the activator type, for single activator mixes. However, the incorporation of SS changed this trend as the KOH and SS combination resulted in higher compressive strength compared to the NaOH and SS. The gradual increase of the PP ratio in the mix design decreased the density and thermal conductivity, on the other hand, increased the water absorption values of the geopolymer mortars. However, the physical properties were insignificantly changed in geopolymer mortars incorporating 60, 70, and 80% of PP in the binder.

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“…Moreover, for the same study [26], at the end of 300 freezing and thawing cycles, porosity was increased up to 12% for high strength concrete incorporating PA. Gökçe et al [27] stated that lightweight reactive powder concrete can be developed with including pumice as fine aggregate (size 0-1 mm) with the compressive strength of 69 and 176 MPa. Kabay et al [28] determined lower mechanical performance of concretes incorporating 50% and 100% pumice (size 1-4 mm). Hossain et al [18] observed 28%, 27% and 30% reduction at 28 days for compressive strength, modulus of elasticity and tensile strength with including pumice (size 0.15-4.75 mm), respectively.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Acidic and Basic Pumice on Physico-Mechanical and Durability Properties of Self-Compacting Concretes

Yücel

Öz

Güneş

2020

Green Building & Construction Economics

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In this study, properties of self-compacting concretes (SCCs) containing acidic and basic pumice (AP-BP) was investigated. SCCs incorporating AP-BP (SCCAs-SCCBs) were produced with constant slump flow diameter of 720±20 mm and 690±20 mm by adjusting superplasticizer (SP), respectively. Control mixture was designed with totally crushed stone aggregate. SCCAs and SCCBs could be produced up to 100% coarse AP with 20% increments and 60% coarse BP with 10% increments, respectively, to ensure the desired limit values for SCC. Firstly, fresh properties of SCCs were determined. Then, the mechanical and durability properties of SCCs were measured at 28 and 56 days. Test results indicated that workability properties of SCCAs are markedly higher than that of SCCBs. Additionally, mechanical and durability performances of SCCs decreased with increasing of AP and BP. The compressive strengths of SCCs containing 60% AP and BP decreased approximately 28-29% and 22-24%, compared to the control mixture, respectively. Similarly, modulus of elasticity of same mixtures decreased around 35-39% and 17-19%, respectively. However, all results indicated that SCCs produced with AP and BP provided the available limits in the design of SCC. Additionally, SCCBs exhibited higher performance than SCCAs in terms of hardened properties. Moreover, high correlation coefficients (R2>0.89) between the durability and mechanical properties were found for SCCs.

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Effect of Prewetted Pumice Aggregate Addition on Concrete Properties under Different Curing Conditions

Abstract: Abstract

Cited by 11 publications

References 27 publications

Utilization of OPC-Pumice composites for efficient heavy metals removal

Utilization of OPC-Pumice composites for efficient heavy metals removal

Pumice as Precursor in Geopolymer Paste and Mortar

The Effects of Acidic and Basic Pumice on Physico-Mechanical and Durability Properties of Self-Compacting Concretes

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