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Porosity and permeability of foamed concrete ScienceDirect

Porosity and permeability of foamed concrete ScienceDirect

Porosity and permeability of foamed concrete - ScienceDirect

May 01, 2001  The porosity of the foamed concrete is the sum of the entrained air voids and the voids within the paste. The relationship between dry density and porosity of both pastes and foamed concrete can be seen in Fig. 1.From this figure it can be seen that there is a strong relationship between porosity and dry density which is largely independent of ash type, ash content, or the inclusion of the foam.

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The effect of porosity on the strength of foamed concrete ...

Feb 01, 2002  The lowest porosity, at 29%, was measured for the cement paste with a water/cement ratio of 0.3 containing no ash. The cement paste with a water/cement ratio of 0.6 had a porosity of 40%, which is virtually the same as the porosity of the foamed concrete mixtures with a casting density of 1500 kg/m 3 and an ash/cement ratio of 3.

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The relationship between porosity and ... - ScienceDirect

Nov 01, 2011  In this study, silica fume was employed in Group 2 to improve the strength of porous concrete and consequently the gravity of ρ c was slightly adjusted. For calculating ρ c, the relative gravity for cement and silica fume was taken as 3.15 and 2.2 respectively.Hence, ρ c = (1 + 0.07)/(1/3.15 + 0.07/2.2) = 3.063 for Group 2. The measured effective porosity and estimated total porosity for ...

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(PDF) Porosity and permeability of foamed concrete

A study has been undertaken to investigate the effects, on the properties of foamed concrete, of replacing large volumes of cement (up to 75% by weight) with both classified and unclassified fly ash.

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Properties of a foamed concrete with soil ... - ScienceDirect

Feb 01, 2015  2.2. Specimen preparation. Foamed concrete was produced in a laboratory using a paddle mixer by adding the preformed foam to a base mix. Three different variations of the foamed concrete were made: Series I, the control mixtures cast using soil, cement, foaming agent and water; Series II, which used the combination of cement and silica fume as the binder; and Series III, which

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Pore Structure and Permeation Characteristics of Foamed ...

between porosity and water vapour permeability was studied in foamed concrete and cement pastes by Kears-ley and Wainwright (Kearsley and Wainwright 2001a). In this study, it was concluded that water vapour perme-ability increases with increased porosity, or decreased density, with similar trend lines for mixtures both with and without foam.

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(PDF) POROSITY, PERMEABILITY AND MICROSTRUCTURE OF FOAMED ...

Keywords: Foamed concrete, Microstructure, Permeability, Porosity, SEM 1.0 INTRODUCTION Foamed concrete is a lightweig ht material with densities that vary between (400 - 1800) kg/m 3 [1], known

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Pore Structure and Permeation Characteristics of Foamed ...

Jun 01, 2019  A study has been undertaken to investigate the pore structure characteristics, porosity and critical pore diameter of preformed foamed concrete with a density between 1300 and 1900 kg/m 3, and its effect on the permeation characteristics, water absorption and permeability.Different measured and calculated methods were adopted to determine the above properties and a comparison between

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WATER ABSORPTION AND STRENGTH PROPERTIES OF

lightweight foamed concrete (LFC) with density of 1300 kg/m3 in terms of initial surface absorption, sorptivity, water absorption, porosity, compressive strength as well as ultrasonic pulse velocity (UPV). Three types of lightweight foamed concrete were prepared, namely i) LFC with 0% eggshell powder replacement as control mix

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Effect of W/C Ratio on Durability and Porosity in Cement ...

Apr 15, 2014  Water is often added to concrete placing for easy workability and finishability in construction site. The additional mixing water can help easy mixing and workability but causes increased porosity, which yields degradation of durability and structural performances. In this paper, cement mortar samples with 0.45 of W/C (water to cement) ratio are prepared for control case and durability ...

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Hygro-thermal and durability properties of a lightweight ...

highly porous foamed aggregates obtained from polymeric end-of-waste materials were investigated. The evaluation of capillary water absorption, thermal conductivity, water vapour permeability and sul-fate attack resistance of samples where natural quartz sand was replaced by 10%, 25% and 50% in volume with foamed aggregates was carried out.

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On entrained pore size distribution of foamed concrete

However, determination of the total air void content (porosity) is Foamed concrete is a versatile material consisting of either not sufficient as shape, size and distribution of voids may affect the Portland cement paste or cement filler matrix (mortar) with strength and durability of concrete [5]. homogeneous pore structure created by ...

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Comparison between the falling head and the constant head ...

In this study, the permeability tests were explained and used to assess the permeability coefficient of different mixes of PC produced with sustainable aggregates. The experimental results were used to analyze the relationship between the porosity and the permeability of concrete and compare the performance of the falling head and constant head ...

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Study on the Permeability Characteristics of Foamed ...

Jun 06, 2021  Permeability is one of the significant material properties that governs its long-term durability. This work presents a method to explore the permeability characteristics of foamed concrete based on X-ray microcomputed tomography (micro-CT) image reconstruction technique and Simpleware version M-2017.06 software.

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A Comparative Study of Indoor Radon Contributed by ...

The radon diffusion coefficient of concrete was measured by continuous radon monitor. The measured value was (3.78 ± 0.39)×10-8 m2/s and found independent of the radon gas concentration in source chamber. The radon permeability of concrete varied between 1.85×10-17 to 1.36×1015 m2 for the bulk pressure difference fewer than 20 Pa to 73.3 kPa.

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A review of X-ray computed tomography of concrete and ...

microCT to analyse concrete and asphalt: these studies can usually be categorized by the type of information gained by microCT, with broad categories being the sections in this review: porosity, phase identification and density, damage and failure analysis, fibre rein-forcement, temporal evolution or time-lapse studies (also in-situ

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Open Access proceedings Journal of Physics: Conference series

May 17, 2019  chemical treatment improves the concrete, mortar and grout Portland cement, the characteristics of resistance to compression (see figure 1) [4] and flexural strength, durability and reduction of permeability [7, 11, 13, 14], appearance determined by the

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View of Nuclear magnetic resonance analysis of freeze-thaw ...

3.2. Porosity of natural pumice concrete TOP. Porosity is the ratio of the total volume of voids to the total volume of the concrete. Applying NMR analysis, we measured the porosity for different values of N (0, 50, 100, 150, and 200). The results are listed in Table 6. The permeability and movable fluid content can be calculated with the ...

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Hilmi Mahmud University of Malaya, Malaysia - Academia

Hilmi Mahmud, University of Malaya, Malaysia, Department of Civil Engineering, Faculty Member. Studies Environmental Sustainability, Utilisation Of Waste Materials In Concrete, and Concrete Technology.

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THE PERMEABILITY OF PORTLAND LIMESTONE CEMENT CONCRETE

THE PERMEABILITY OF PORTLAND LIMESTONE CEMENT CONCRETE. The effect of limestone addition on the air permeability, water permeability, sorptivity, and porosity of limestone cement have been investigated in this paper. Six Portland limestone cements (PLCs) with different limestone content (10-35% w/w) were produced by intergrinding clinker ...

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(PDF) The effect of pore size on microstructural ...

The stability of foam concrete before setting will affect microstructural properties i.e porosity, pore size, density, permeability, strength and thermal conductivity. This study investigates the ...

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(PDF) Geopolymer foam concrete: An emerging material for ...

A comprehensive review of current foam concrete technology and geopolymer technology. A concept of developing geopolymer foam concrete with great environmental benefits. A concrete with low cost, high strength/weight ratio and potential fire

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Reading: Porosity and Permeability Geology

Reading: Porosity and Permeability. Figure 1. A spring coming out of the shale near Red Creek. Yes, that water is black! (Photo: Matt Herod) As we’ve learned, groundwater is simply water that exists underground. However, there are still lots of misconceptions about how people envision groundwater. Many envision large underground lakes and ...

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Models for Strength Prediction of High-Porosity Cast-In ...

Apr 26, 2018  A study was undertaken to develop a prediction model of compressive strength for three types of high-porosity cast-in-situ foamed concrete (cement mix, cement-fly ash mix, and cement-sand mix) with dry densities of less than 700 kg/m3. The model is an extension of Balshin’s model and takes into account the hydration ratio of the raw materials, in which the water/cement ratio was a ...

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On Void Structure and Strength of Foamed Concrete Made ...

Nambiar and Ramamurthy [3] determined the air void size distribution of foamed concrete mixes with different added foam volumes (10%, 30% and 50%) and found that the size of the larger voids increased sharply with an increase in foam volume, while for the same foam volume they were smaller for a cementy ash mix compared to a cementsand mix.

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Foam Concrete: A State-of-the-Art and State-of-the ...

Foam concrete (FC) has the potential of being an alternative to ordinary concrete, as it reduces dead loads on the structure and foundation, contributes to energy conservation, and lowers the cost of production and labor cost during the construction and transportation. The paper reports a state-of-the-art review of foam concrete in terms of its components, manufacturing and material properties ...

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A review of X-ray computed tomography of concrete and ...

microCT to analyse concrete and asphalt: these studies can usually be categorized by the type of information gained by microCT, with broad categories being the sections in this review: porosity, phase identification and density, damage and failure analysis, fibre rein-forcement, temporal evolution or time-lapse studies (also in-situ

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Where might I find research reports on porous concrete ...

I did my B.E. project on Pervious concrete. There are not so many research papers on that. And a very few are openly accessible. We got some promising results, but their behavior is really difficult to interpret. We used many types of aggregates a...

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Avizo Software for Porosity Analysis Thermo Fisher ...

The concrete pore space is identified, and the connected vs isolated porosity is classified. The isolated porosity is represented as a pore network model, and the permeability of the concrete is evaluated. The streamlines representing the velocity field in the permeability experiment simulation are visualized passing through the sample.

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Shear Behavior of Fiber foam Reinforced Concrete Beams ...

ScienceDirect Procedía. Engineering. Procedía Engineering 171 (2017) 994 - 1001 - ... investigated the effect on the porosity and permeability of foam concrete by replacing volumes of cement with fly ash. They found that porosity depended on the dry density of the concrete, and permeability increased with increasing porosity and ash content [24].

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Open Access proceedings Journal of Physics: Conference series

May 17, 2019  chemical treatment improves the concrete, mortar and grout Portland cement, the characteristics of resistance to compression (see figure 1) [4] and flexural strength, durability and reduction of permeability [7, 11, 13, 14], appearance determined by the

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Anadolu University School of Natural Sciences ESKİŞEHİR ...

Important properties in terms of permeability and vascularization. Porosity (%) 80 7 0 60 5 4 30 Pore connectivity drops along with porosity Drop rate is faster in large-pored foams Foams having average pore sizes below 400 µm are 90 % interconnected down to 30 % porosity

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Porosity - Wikipedia

Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%. Strictly speaking, some tests measure the "accessible void", the total amount of void space accessible from the surface (cf. closed-cell foam).. There are many ways to test porosity in a ...

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