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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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Correlations between air permeability ... - ScienceDirect

Jun 10, 2019  The data of the foamed concrete deviate from the approximation curve. The determination factor is high at 0.64. Fig. 8 shows the air permeability coefficient and the median pore diameter. The determination coefficient is 0.50, higher than those of the critical and conventional threshold pore diameters.

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Porosity-Permeability Relationship of Concrete - Civil ...

An interconnected pore system with high porosity, allow fluids to transport through the concrete; thus contributing permeability to concrete. If the pore system is discontinuous or however pores are ineffective in respect of transportation of fluid, the permeability of concrete will be low, even the concrete mass have high porosity.

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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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Pore Structure and Permeation Characteristics of Foamed ...

For the selected foamed concrete mixes, the apparent porosity was determined (see ) by Table 2 drying a 28- day old specimen (100×100×70 mm) at 100±5˚C for 2

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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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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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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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Recycling of waste ceramic foams as fine aggregates in ...

deteriorating porosity or permeability. To this end, discarded ceramic foam was crushed and used as ne aggregates for making a high strength pervious concrete (HSPC). For comparison, traditional pervious concrete (TPC) without ne aggregates was prepared as well. The compressive strength, porosity and permeability of both samples were characterized

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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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Properties and applications of foamed concrete; a review

C 796-97 test procedures [32,33]. The air voids range between 6% and 35% of the total volume of final mix in most foamed concrete applications [34].

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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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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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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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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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Recent progress of hydrophobic cement ... - sciencedirect

1.Introduction. Cement-based materials, such as concrete and cement mortar, are the widely used building materials in the world. They show highly hydrophilicity on account of the fact that there are a large number of pores, flaws and hydroxyl groups generated by cement hydration .Such hydrophilic and porous structures easily cause the permeability of water into cement-based materials.

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Influence of Compaction on the Interfacial Transition Zone ...

In this study 1 self-compacting concrete (SCC) mixture and 2 conventionally vibrated concrete (CVC) mixtures are studied in order to determine the influence of compaction on the porosity of the ITZ. Additionally oxygen permeability and water conductivity were measured in

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

Geopolymer foam concrete: An emerging material for sustainable construction. Download. Related Papers. Lightweight concretes of activated metakaolin-fly ash binders, with blast furnace slag aggregates. By J Ivan Escalante. New synthesis method for the production of coal fly ash-based foamed

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Porosity control of cold consolidated geomaterial foam ...

The fact that the foam is potassium foam poured into a mold with a 3 cm diameter, dried prepared in an open system, where thermal and mass exchanges at 55 8C after a 1 h step at 70 8C will be written 31F1–7055. occur between the air and the foam, implies that the drying aspect, associated with the consolidation, is important for the 2.2.

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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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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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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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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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Evaluation of Relationship between Water Absorption and ...

Apr 10, 2014  The permeability of concrete was evaluated according to Testing Code of Concrete for Port and Waterwog Engineering (JTJ 270-98). A water pressure of 1.2 MPa ± 0.5 MPa was applied on the concrete for 24 h, and then the permeability height was measured by splitting the concrete, as shown in Figure 2.The permeability coefficient was calculated using where is the relative permeability

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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

get price

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...

get price

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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Advantages and Disadvantages of Lightweight Concrete ...

Jun 29, 2020  The main difference between lightweight concrete and other types of concrete is its composition. Specific types of lightweight aggregates make varying forms of lightweight concrete. These vary from lightweight aggregate concrete, foamed concrete, or Autoclaved Aerated Concrete (AAC).

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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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ABSTRACT

The porosity and permeability exhibit similar behaviors, and the change rule is clear. With increasing porosity, the permeability of concrete presents a linear increase. During 50, 100, 150, and 200 freeze-thaw cycles, successive permeability values increase by a factor of 1.2–1.7 relative to the previous value. Figure 6. Variation curves of ...

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