The effect of high fly ash content on the compressive strength of foamed concrete

Kearsley, Elsabé P.; Wainwright, P. J.

doi:10.1016/s0008-8846(00)00430-0

Cited by 336 publications

(132 citation statements)

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“…Afterwards the specimens were wrapped with polythene wrapping and kept until the day of testing [18]. Before 24 hrs of the testing date, specimens were kept in an oven at a temperature of 105Cº + 2Cº then they would be taken out, weighed, left to cool down then tested.…”

Section: Testing Proceduresmentioning

confidence: 99%

Utilisation of Oil Palm Ash in Foamed Concrete

Awang

Al-Mulali

Khalil

et al. 2014

MATEC Web of Conferences

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Abstract. This study is a part of an on-going research examining the properties of foam concrete when replacing the cement with semi-processed Oil Palm Ash (OPA). Replacements range from 25% to 65% were used for a mix having the mix ratio of (1:2:0.45) and having the target density of 1300kg/m 3 . All mixes were tested for their strength using the compressive, splitting tensile and flexural strengths up to the age of 28 days. Results show that a 25% replacement level exhibited higher compressive and splitting tensile strength than that of the control mix at the age of 28 days. However, the same replacement level exhibited a close strength to that of the control mix when tested for the flexural strength at the same age.

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Section: Testing Proceduresmentioning

confidence: 99%

Utilisation of Oil Palm Ash in Foamed Concrete

Awang

Al-Mulali

Khalil

et al. 2014

MATEC Web of Conferences

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“…Besides the dry density formula (see Equation 1), the sum of the volume of all the constituent materials should be 1 cubic metre (or 1000 litres) (Kearsley, 1999;Kearsley and Mostert, 2005a;Kearsley and Wainwright, 2001) as shown in the formula below (2) where x is the cement content (kg/m 3 ); w/c is the water/cement ratio (indicating total water to cement mass in the foamed concrete mix); a/c is the ash/cement ratio; s/c is the sand/cement ratio; V f is the volume of foam (l); RD c is the relative density of cement; RD a is the relative density of ash; and RD s is the relative density of sand.…”

Section: Experimental Set-upmentioning

confidence: 99%

Heat evolution due to cement hydration in foamed concrete

Tarasov

Kearsley

Kolomatskiy

et al. 2010

Magazine of Concrete Research

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Foamed concrete is nowadays considered an attractive building material as a result of flexible production technology and excellent target properties, along with economic benefits. Heat generated in foamed concrete during cement hydration is found to differ significantly from normal-weight concrete. Foamed concrete that is placed in a regular-shaped well-insulated mould experiences significant core temperature rises and, although several documents discussing the thermal effect in foamed concrete have been published, there is still a lack of information revealing the interrelations of foamed concrete parameters and their effect on temperature rise. Laboratory tests were carried out with foamed concrete of variable densities and volumes under semi-adiabatic curing conditions. The observed trends were used as the initial input for a mathematical model of temperature prediction in foamed concrete. The heat evolution process under real production conditions can be controlled by optimising the mix composition. If the thermal energy in foamed concrete is properly employed it can result in considerable improvement of the final product characteristics while production costs decrease.

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“…There are many lightweight construction materials that contain recycled fillers such as fly ash (Kearsley and Wainwright, 2001;James et al, 2011), waste glass (Duman et al, 2002), steel slag (Yue et al, 2000;Fiore et al, 2008), lightweight expanded clay aggregates (James et al, 2011;Roshan et al, 2010), foam polystyrene (Laukaitis et al, 2005) and more. Landfills all over the world are filled with tremendous amounts of scrap tires.…”

Section: Introductionmentioning

confidence: 99%

Use of Crumb Rubber to Improve Thermal Efficiency of Cement-Based Materials

Fadiel

Rifaie

Abu-Lebdeh

et al. 2014

American Journal of Engineering and Applied Sciences

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Motivated by the tremendous trend toward green environment and to reduce the effect of scrap tires on the environment and human health, this research is an attempt to find a practical and environmentally sound solution of the problem of scrap tires by developing a light weight with low thermal conductivity composite construction materials using waste tires. A few literatures may be found about the effect of crumb rubber on thermal conductivity of mortar. Thus, in this research project, an experimental program was established to investigate the effect of the amount and size of crumb rubber (rubber obtained from recycling scrap tires) on the thermal properties of mortar. Four levels of crumb rubber addition: 10, 20, 30 and 40% and three sizes of crumb rubber (#30, #10_20 and a combination of both sizes) were considered to make twelve different mixtures of the rubberized mortar. Specially designed and constructed heat transfer measurement device was used to measure thermal conductivity of the specimens. Results were used to determine the optimal amount of crumb rubber that gives the least thermal conductivity, which directly related to the improvement in thermal resistance of concrete mixtures. It was found that the size and the amount of crumb rubber had an effect on thermal properties of the specimens investigated. The thermal conductivity of rubberized mortar was decreased by 28% when crumb rubber #10_20 was used. It was also found that #10_20 crumb rubber had more effect on the thermal conductivity reduction than #30 crumb rubbers. An empirical equation is proposed to predict thermal conductivity of rubberized mortar.

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The effect of high fly ash content on the compressive strength of foamed concrete

Cited by 336 publications

References 1 publication

Utilisation of Oil Palm Ash in Foamed Concrete

Utilisation of Oil Palm Ash in Foamed Concrete

Heat evolution due to cement hydration in foamed concrete

Use of Crumb Rubber to Improve Thermal Efficiency of Cement-Based Materials

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