Optimization of Micro Silica in Light Weight Lika Concrete

Roshan,

doi:10.3844/ajeassp.2010.449.453

Cited by 4 publications

(4 citation statements)

References 6 publications

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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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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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“…A significant number of studies have been done on the durability of concrete and its ability to withstand severe weather conditions (Kumaran et al, 2008;Roshan et al, 2010;Nagaradjane et al, 2009;Malhotra and Carino, 2004). The later presented a review of nondestructive testing methods used for determining the dynamic modulus of elasticity of concrete.…”

Section: Introductionmentioning

confidence: 99%

Freezing and Thawing Durability of Very High Strength Concrete

Hamoush¹,

Picornell-Darder²,

Abu-Lebdeh³

et al. 2011

American Journal of Engineering and Applied Sciences

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Problem statement: The newly developed Very High Strength Concrete (VHSC), having compressive strengths of 29 ksi and flexural strengths of 6 ksi, represents a breakthrough in concrete technology. Study to further enhance the properties of this new concrete is continuing. Approach: The objective of this study is to investigate the effect of exposing Very High Strength Concrete (VHSC) specimens to rapid freeze/thaw cycles. Twenty one specimens were tested according to the Standards of the American Society for Testing and Materials ASTM C215, ASTM C666 and ASTM C78. Results: One hundred freeze/thaw cycles were performed on the VHSC specimens. Change in specimens dimensions and materials properties were recorded at zero, forty, seventy and one hundred cycles. Dimensions and properties considered were: dimension of cross section, length, weight, Dynamic Moduli, Poissons Ratio, durability factor and Modulus of Rupture. Conclusion/Recommendations: The test results indicated that VHSC is good freeze-thaw resistance (durability factor > 85%) and can avoid freeze/thaw damage. Freeze- thaw cycling did not significantly affect VHSC specimens cross sectional dimensions, length, or Poissons Ratio. However, there was a decrease in the specimens weight with the increase in number of freeze/thaw cycles, but the decrease was very slim indicating little or no deterioration has occur. Moreover, the fine voids exist in VHSC greatly lower the freezing point of any trapped water, making the material less susceptible to Freeze- Thaw damage

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“…It contributes both pozzolonic and filler effect to the concrete, but more dominantly in filling effects due to its extremely fine particle size. As a result, it drastically increases the water demand of the mixture but it can be overcome by incorporating high range water reducing admixture like superplasticiser (Caldarone, 2009;Neville, 1995;Khatri and Sirivivatnanon, 1995;Ravichandran et al, 2009;Roshan et al, 2010) The finely divided particles reacts aggressively with calcium hydroxide when added to the fresh concrete and forms calcium silicate hydrate, which enhance the resistivity of concrete towards chemical attacks and compressive strength (Caldarone, 2009). The filler effect is resulted by the extremely fine (<1 micrometer) particles.…”

Section: Introductionmentioning

confidence: 99%

Rational Mix Design Approach for High Strength Concrete Using Sand with very High Fineness Modulus

Hoe¹

2010

American Journal of Applied Sciences

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Problem statement: Production of concrete is always deal with inconsistency. Sources of variation like materials from different geographical basis, mix design method, fineness of aggregates and so on will attribute to different level of achievement of the concrete. Even though researcher had verified that higher fineness modulus of sand would yield better performance for the concrete, but so far there have been scarce amount of paper reported on the mix design method adopting high fineness modulus of sand. Approach: This study discussed the revolution of design mix proportion towards achieving high strength with considerably cement content using local availably constituent materials. A total of 15 mixes was casted till to the high strength at more than 65 MPa was achieved. The compressive strength and workability of each mixes were presented. The method of mixture proportioning was begun with British Department Of Environment (DOE) method. Then, rational design method of achieving high strength concrete was developed. Results: At the end of experimental program, it was found that DOE method was not suitable to apply in designing high strength concrete. 12% was the optimum level of replacement of the total binder content by silica fume. Further increase of total binder content without adjustment to the amount of aggregate content has decreased the strength achievement of the concrete. Very coarse fine aggregate with fineness modulus 3.98 increased the compressive strength of the concrete in large extent. The increased of superplasticiser from 2.0% to 2.5% has decreased the compressive strength of the concrete. Conclusion: The rational mix design approach was developed. A Grade 70 concrete can be produced with moderate level of cement content by this approach.

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Optimization of Micro Silica in Light Weight Lika Concrete

Cited by 4 publications

References 6 publications

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

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

Freezing and Thawing Durability of Very High Strength Concrete

Rational Mix Design Approach for High Strength Concrete Using Sand with very High Fineness Modulus

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