the effect of porosity on the strength of foamed concrete

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

Feb 01, 2002 · Effect of porosity on compressive strength. The relationship between measured porosity and the compressive strength (after 1 year) of foamed concrete is shown in Fig. 2. From this graph, it can be seen that the relationship is not significantly influenced by the use of pfa or pozz-fill.

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

A study has been undertaken to investigate the effects of replacing large volumes of cement on the properties of foamed concrete (up to 75% by weight) with both classified and unclassified fly ash. This is the third paper in a series; it investigates the relationship between porosity and compressive strength and presents mathematical models ...

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

Foam concrete is a light-weight concrete. It has high flowability, porosity, fire resistance, airborne sound insulation, good heat insulation, and a desirable compressive strength. The goal of ...

The Effect of Porosity on the Strength of Foamed Concrete ...

Bubbles within the foamed concrete manufactured by pre-foaming method is the main factor which affects the physical properties of foamed concrete such as density, strength, and porosity.

(PDF) Porosity and permeability of foamed concrete

May 01, 2001 · The compressive strength of foam concrete can increase to 3.90 MPa, and its thermal conductivity can reach 0.1347 W/ M·k. MP has the largest apparent effect on the compressive strength

Relationship between Porosity & Strength of Concrete

Sep 13, 2017 · Relationship between Porosity & Strength of Concrete. Anonymous September 13, 2017. Porosity can be defined as the total volume of the overall volume of the pores larger than the gel pores, expressed as a percentage of the overall volume of the cement paste. The effects of pores smaller than 20mm in diameter were found to be negligible.

Effect of Porosity - an overview | ScienceDirect Topics

Effect of porosity on the compressive strength of foamed concrete after 365 days [36]. 11.6 f c = 981 e − 7.43 p where: f c is the compressive strength of foamed concrete and p is the porosity.

EFFECT OF POROSITY ON THE STRENGTH OF CONCRETE

effect of porosity on the strength of concrete. an exponential function is recommended for the compressive strength versus air content relationship. experimental evidence shows that a change in the air content affects the compressive strength of a concrete more than its flexural or tensile strengths.

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

Apr 26, 2018 · 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.

Effects of different control methods on the mechanical and ...

Nov 30, 2020 · In order to explore the optimal dosage of preformed foam, foamed concrete samples with W/C of 0.42 and varying foam contents (10%, 30% and 50%, by weight of cement) were made, and then their dry density, porosity, volumetric water absorption, compressive strength and thermal conductivity were measured.

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

Porous concrete, which differs from conventional concrete, has relationships between porosity and strength developed for normal a large volume of air voids. Currently it is mainly utilized in perme- concrete need to be examined and extended for porous concrete. able pavements and infiltration beds [2]. For maximizing the ben- This is the ...

WATER ABSORPTION AND STRENGTH PROPERTIES OF

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

THE EFFECT OF MICROSTRUCTURE ON THE PROPERTIES OF

The results show that the compressive strength of foamed concrete is a function of age, ash/cement ratio and porosity and for a given porosity and age there is an optimum ash content, resulting in the maximum compressive strength. The focus of this research is therefore on foamed concrete mixhlfes with target densities varying between 700

The Pore Characteristics of Geopolymer Foam Concrete and ...

Aug 10, 2016 · The total volume of pores, namely porosity, correlates with density and plays an important role that affects the compressive strength of foam concrete (Matusinović et al., 2003). In this study, the connectivity of pores refers the interaction of introduced voids, and this characteristic determines the strength and permeability of foam concrete.

Foam Concrete: A Review

Jul 30, 2021 · The compressive strength of the foamed concrete was shown to be a function of porosity and age, and a multiplicative model (such as the

PROPERTIES OF FOAM CONCRETE PREPARED FROM

foamed concrete [20]. The results show that the use of a large amount of FA reduces the strength growth rate of the foamed concrete, but it can replace up to 67 % of the cement in the case where the long-term strength is not significantlyreduced. EP Kearsley studied the effectsof the porosity on the strength properties of foam concrete

Experimental and numerical investigation of influence of ...

[en] Highlights: • A combined experimental-numerical approach can further the characterisation of foamed concretes with varying densities. • Porosity and types of air voids in a foamed concrete can have a profound effect on its mechanical properties. • DEM analyses indicate that local pore collapse and macro shear failure compete to govern the response of foamed concrete.

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

Jan 01, 2018 · 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 [[sigma].sub.0] parameter of high-porosity foamed concrete only reflects the uniaxial compressive strength of

Fundamental Study on the Development of Structural ...

Based on the porosity of concrete specimens with foaming agent, compressive strength values of structural lightweight foam concrete (SLWFC) were obtained. It was also found that the estimated values from proposed equations for compressive strength and modulus of elasticity of SLWFC, and values obtained by actual measurements were in good agreement.

Experimental Investigation of the Residual Physical and ...

Jul 07, 2021 · Foamed concrete has been widely used in building energy conservation and insulation engineering, and its fire resistance is very important for buildings under fire. However, due to high porosity and permeability, the properties of foamed concrete

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 ...

Compressive Strength Of Foam Concrete

The effect of porosity on the strength of foamed concrete. The main aim of this part of this study was to investigate what effects the addition of the foam had on porosity and ... f c =compressive strength of concrete ...

Models for strength prediction of foam concrete | SpringerLink

Mar 27, 2007 · Porosity is considered to have a significant impact on compressive strength of foam concrete [].In this study, a strength-porosity model for foam concrete is developed by adopting the generalized model of Balshin which can be expressed similar to the form σ y = σ o (1−n) b.In the cellular concrete model of foam concrete made of neat cement paste used by Hoff [], the volume of water is ...

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 ...

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

Porous concrete, which differs from conventional concrete, has relationships between porosity and strength developed for normal a large volume of air voids. Currently it is mainly utilized in perme- concrete need to be examined and extended for porous concrete. able pavements and infiltration beds [2]. For maximizing the ben- This is the ...

WATER ABSORPTION AND STRENGTH PROPERTIES OF

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

Porosity and Water Absorption of Aerated Concrete with ...

porosity is mainly dependent on the dry density of AC rather than the content or the type of fly ash. The volume of water absorbed by foamed concrete was twice that of the cement paste. The influence of Al (0.2% - 0.8%) on porosity, density and compressive strength of autoclaved clayey cellular concrete was studied by Gugliemi . et al

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

the compressive strength goes down [7]. Effect of H 2 O 2 dosage on porosity. For foam concrete, hole, as one of the significant components of its structure, have great influence on macroscopic properties of foam concrete. Fig.3 shows the variation curve of foam cement based absorbing materials porosity along with the increasing of

PROPERTIES OF FOAM CONCRETE PREPARED FROM

foamed concrete [20]. The results show that the use of a large amount of FA reduces the strength growth rate of the foamed concrete, but it can replace up to 67 % of the cement in the case where the long-term strength is not significantlyreduced. EP Kearsley studied the effectsof the porosity on the strength properties of foam concrete

Effect of Density and Porosity on the Durability of Flyash ...

increase in porosity of concrete. Various factors such as water to cementitious materials ratio, degree of hydration, air content, consolidation, mineral admixtures, aggregates, reaction between aggregate and cement paste, pozzolanic admixture, etc., affect concrete porosity. The effects of these factors on concrete porosity and durability are ...

Effect of Porosity on the Stiffness of Cast Steel

Porosity occurs in natural resources (e.g., wood, bone, coral, and rock) and can form in man-made materials (e.g., concrete, foams, ceramics, composites, and met-als). Stiffness and strength properties of porous mate-rials depend not only on the amount of porosity, but on its distribution relative to imposed loads, and on other

Effect of expox resin on the properties of high-porosity ...

Apr 27, 2016 · A compressive strength and thermal conductivity of 0.77 MPa and 0.069 W/m·K, respectively, at a porosity of 89.4%, were obtained for the resin-modified cement foam. Moreover, resin addition also resulted in a decrease in the water absorption and a slight increase in the thermal conductivity of the cement foam.

The effect of mineral additives on foam concrete porosity ...

Non-autoclave foam concrete is a promising material for low-rise house construction. It has been found that the addition of mineral additives allows to regulate the porous structure of non-autoclave foam concrete, at the same time the coefficient of thermal conductivity is reduced, density is reduced, and frost resistance is improved. The introduction of dispersed wollastonite and diopsid ...

THE EFFECT OF FIBRE REINFORCING ON FOAMED CONCRETE ...

Foamed concrete consists of air entrained cement paste and the high void content results in not only a reduction in strength but also a change in the way the material fails. The relatively high cement content and lack of aggregates in foamed concrete results in high shrinkage and the

THE USE OF GRINDED ANDESITE-SAND AND FOAMING

1. The amount of foam-agent use in the making of foam concrete greatly affects the workability, density, compressive strength, and porosity of the concrete 2. The usage of andesite-sand grinded and 2% foam-agent increased density and the compressive strength of foam concrete, respectively 1867 kg/m3 and 13,84 MPa, 3.

EFFECT OF PROCESSED SPENT BLEACHING EARTH AS

Figure 3.7 Measuring weight of 1 liter of foam 18 Figure 3.8 Curing process 19 Figure 4.1 Thermal conductivity of foamed concrete 22 Figure 4.2 Variations of temperature through 8 hour run 22 Figure 4.3 Porosity of foamed concrete 23 Figure 4.4 Relationship between thermal conductivity and porosity

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 ...

Top PDF Porosity, Pore Size and Compressive Strength of ...

The results and discussion of the compressive strength of SCC using sea water has been described previously, that increasing compressive strength of SCC was in line with age, In addition, sea water gives increasing effect of SCC compressive strength at an earlier age if it was compared with SCC that using fresh water [7,8]. Fig. 2 showed curve of the relationship between porosity, compressive ...

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