the effect of porosity on the strength of foamed concrete

Relationship between pore structure and compressive strength ...

Mar 16, 2016 · Abstract. Properties of concrete are strongly dependent on its pore structure features, porosity being an important one among them. This study deals with developing an understanding of the pore structure-compressive strength relationship in concrete.

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Pervious concrete: effects of porosity on permeability and ...

Pervious concrete needs to have many pores to achieve high water permeability, but excessive porosity may cause a serious reduction in strength. Herein, it is postulated that the interconnected porosity and open porosity, which can be separately measured, do not have the same effects on the performance of pervious concrete.

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EVALUATION OF STRENGTH, PERMEABILITY AND VOID …

density, compressive strength and permeability and void ratio. The compressive strength pervious concrete showed an increase in water/cement ratio increased. The compressive strength of pervious concrete is less than conventional concrete. The void ratio is to be found in range of 25% to 32%, which is sufficient for pervious concrete.

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Relationship between pore structure and compressive ...

Mar 16, 2016 · Abstract. Properties of concrete are strongly dependent on its pore structure features, porosity being an important one among them. This study deals with developing an understanding of the pore structure-compressive strength relationship in concrete.

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PDF Effect of Specimen Shape and Size on the Compressive ...

Effect of Specimen Shape and Size on the Compressive Strength of Foamed Concrete M.A.S. Sudin1, M. Ramli2,a 1,2 School of Housing, Building and Planning, Universiti Sains Malaysia, 11800, Penang, Malaysia Abstract - Lightweight concrete, in the form of foamed concrete, is a versatile material

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Engineering Properties of Sound Absorbing Foamed Concrete ...

It is thus concluded that foam ratio was the most dominant factor, and significantly affected all properties of lightweight foamed concrete in this study. W/B rarely affected total void ratio and continuous void ratio as well as compressive strength, and dry density and foam agent dilution ratio also had little effect onalmost all properties.

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Preparation of high performance foamed concrete from ...

The titled high performance foamed concrete was developed from Portland cement, ultra fine granulated blast-furnace slag, pulverized fly ash and condensed silica fume by means of pre-foaming process. The resultant foamed concrete presents its thermal conductivity of about 0.16–0.75 W/(m · °C) and 28 d compressive strength of about 1.1–23.7 MPa when its mix proportion varies in the range ...

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Foam concrete - Wikipedia

Foam concrete, also known as Lightweight Cellular Concrete (LCC), Low Density Cellular Concrete (LDCC), and other terms is defined as a cement-based slurry, with a minimum of 20% (per volume) foam entrained into the plastic mortar. As mostly no coarse aggregate is used for production of foam concrete the correct term would be called mortar instead of concrete; it may be called "foamed cement ...

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Effect of moisture content and porosity on compressive ...

Effect of moisture content and porosity on compressive strength of concrete during drying at 105 °C Highlights•During drying at 105 °C, with the decrease of moisture content, the compressive strength of concrete decreases initially, and then increases.•Moisture content has a significant effect on compressive strength, and this effect increases with increasing porosity.•The effect of ...

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

Concrete as a porous material has air/water permeable properties and this has a great influence on not only strength but also durability characteristics. Usually deteriorating agents which can cause steel corrosion like chloride ions and carbon dioxide intrude into concrete through pores or their connectivity [ 1 - 3

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Porosity‐Strength Relation in Cementitious Materials with ...

Mahyuddin Ramli, Amin Akhavan Tabassi, Effects of polymer modification on the permeability of cement mortars under different curing conditions: A correlational study that includes pore distributions, water absorption and compressive strength, Construction and Building Materials, 10.1016/j.conbuildmat.2011.09.004, 28, 1, (561-570), (2012).

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[PDF] Models for Strength Prediction of High-Porosity Cast-In ...

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 constant ...

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Characterising fundamental properties of foam concrete ...

UPV method can determine various concrete properties such as strength, dynamic elastic constants, defects, uniformity and effects of curing time. However, for foam concrete application, the effect of high porosity on the UPV test results is largely unknown in current literature. Existing research explored the relationship between porosity and ...

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

Feb 01, 2002 · The strength of cellular concrete in relation to any given cement can, according to Hoff, be expressed using the following equation: (7) σ y σ 0 = d c 1+k b 1+0.2p c p c γ w b where: σ y =compressive strength; σ 0 =theoretical paste strength at zero porosity; k=water/cement ratio (by weight); p c =specific gravity of the cement; d c =concrete density; γ w =unit weight of water; b=empirical …

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POROSITY, PERMEABILITY AND MICROSTRUCTURE OF FOAMED ...

This paper examined the foamed concrete (FC) for permeability of total and capillary water absorption, at 28 days of air sealed curing. The microstructure of 15 selected FC specimens was investigated to determine permeability in relation to porosity and density using Scanning Electron Microscopy (SEM) images. The FC specimens of the densities (1100, 1600, and 1800) kg/m3 were made using fine ...

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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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PDF Water Absorption and Strength Properties of Lightweight ...

This experimental study is aimed to investigate the effects of incorporation of eggshell on its 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

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Preparation of high performance foamed concrete from cement ...

The titled high performance foamed concrete was developed from Portland cement, ultra fine granulated blast-furnace slag, pulverized fly ash and condensed silica fume by means of pre-foaming process. The resultant foamed concrete presents its thermal conductivity of about 0.16–0.75 W/(m · °C) and 28 d compressive strength of about 1.1–23.7 MPa when its mix proportion varies in the range ...

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Influence of Polypropylene Fiber in Strength of Foamed ...

Foamed concrete is material that can be used in wide range of constructions and produced in high density. This investigation examined effect of chopped Polypropylene Fiber (PF) that mixed into admixture concerning strength of foamed concrete high density. Mechanical test were performed to measure effect of PF on improving compressive and splitting tensile strength.

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"Mechanical behavior of polystyrene foam bead lightweight ...

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Ash content for optimum strength of foamed concrete ...

Feb 01, 2002 · The effect of age on the strength development of foamed concrete with 30% porosity containing pozz-fill is shown in Fig. 5 from which it can be seen that the ash content resulting in the maximum strength increases with time. Similar trends were found for other porosities.

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Effect of palm oil fuel ash (POFA) toward foam concrete ...

Four types of foamed concrete were prepared with different percentage LWC with 0%, 10%, 20% and 30%. All the specimens were water cured before being tested. At the 20% concrete containing of POFA had a highest strength which is 11.2, 15.15 and 29.20 MPa and lower porosity is 14.99, 11.94 and 9.54.

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Compressive strength of foamed concrete in relation to ...

Foamed concrete specimens were examined for compressive strength at (28 and 180) days air sealed curing, as well as at 28 days water cured. Also, the microstructure of fifteen selected FC specimens was investigated for porosity in relation to compressive strength using …

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A Hypothesis Concerning the Effects of Macro-Porosity on ...

Abstract. A hypothetical mechanism is offered for the observation that the porosity has a greater effect on the compressive strength of a concrete than on its flexural strength which effect is again greater than that on pulse velocity.

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Effect of reinforcement to the square hollow section on ...

Foamed concrete with a density of 1600kg/m³ is now widely used as a structural component like slab due to it lighter than the normal concrete. Meantime, it helps in saving cost and reduce the use of formwork. The hollow section that implemented to beam is also an effort to make the structural lighter. Processed Spent Bleaching Earth (PSBE) is an industrial waste which possesses pozzolanic ...

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(PDF) The relationship between porosity and strength for ...

Total porosityThe strength of concrete is affected by the volume of its overall voids [9]. In the complex microstructure of concrete, the pores can be present from the nano-scale to the macro-scale. The difficulty of accurately testing the total porosity of porous concrete arises from its unique microstructure.

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PDF Preliminary Study on The Effect of The Inclusion of Palm ...

28 days, the LFC-PF30 concrete obtained higher compressive strength an d porosity of 1.78MPa and 56% respectively, as compared with the normal foamed concrete (NFC). Ke ywords: palm oil fuel ash ...

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Effect of H2O2 Content on the Physical Properties of the ...

In this study, foam cement based absorbing materials was made by taking graphite and magnetic ferrite as electromagnetic wave absorbers. Effect of H2O2 content on dry density, compressive strength and porosity of the materials was studied through single factor experiment. The results show, with the H2O2 dosage increase from 5.0% to 9.0%, the dry density decreases and the porosity increases ...

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

In the high-porosity foamed concrete (f/c = 0, s/c = 1), the hole walls are thinner and less dense, which reduces the interlocking effect. Therefore, in this study, the parameter of high-porosity foamed concrete only reflects the uniaxial compressive strength of the mix constitution.

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Characterising fundamental properties of foam concrete with a ...

However, for foam concrete application, the effect of high porosity on the UPV test results is largely unknown in current literature. Existing research explored the relationship between porosity and strength for metals, as well as the relationship between UPV and porosity for normal mortars. Yet no correlation between UPV and porosity for ...

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