The effects of different cement dosages, slumps and pumice aggregate ratios on the compressive strength and densities of concrete

Şahin, Remzi; Demirboğa, Ramazan; Uysal, Habib; Gül, Rüstem

doi:10.1016/s0008-8846(03)00048-6

Cited by 46 publications

(19 citation statements)

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“…(5) where f cc and f uc are compressive strengths of compressed and uncompressed concretes, respectively. It can be seen from Figure 4 that the compressive strength of the compressed and uncompressed concretes increases with the increase in density, which is consistent with the findings of other researchers (Rahman, 2010;Ramamurthy & Narayanan, 2000;Rao et al, 2011;Sahin et al, 2003) on different kinds of concrete. In general, keeping the type of constituent materials of concrete constant without incorporating additives, an increase in the compressive strength of the compressed and uncompressed concretes arises from an increase in cement content which results in a decrease in air content and an increase in the density.…”

Section: Relationship Between Compressive Strength and Densitysupporting

confidence: 90%

“…There is a consensus in the literature (Rahman, 2010;Ramamurthy & Narayanan, 2000;Rao, Bhattacharyya, & Barai, 2011;Sahin, Demirboga, Uysal, & Gul, 2003) on the relationship between compressive strength of concrete and density, so that most researchers have reported that compressive strength increases as density increases. Ramamurthy and Narayanan (2000) concluded that the compressive strength is a function of the concrete density in such a manner that an increase in density results in a higher compressive strength.…”

Section: Introductionmentioning

confidence: 99%

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Hardened density of freshly compressed concrete and its effect on mechanical properties

Naghipour

Nematzadeh

Jalali

et al. 2014

European Journal of Environmental and Civil Engineering

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This paper presents the results of an experimental investigation into the hardened density of freshly compressed concrete and its effect on the mechanical properties including compressive strength and modulus of elasticity. The concrete specimens were compressed in a fabricated pressure apparatus under different values of pressure and reference concrete strength. Two types of pressure, long-term pressure and short-term pressure were also applied to the fresh concrete to evaluate the effect of pressure duration on the concrete density. The results indicated that the increase in the compressed concrete density increases with the increase in primary pressure and decrease in reference concrete strength. Moreover, the pressure duration poorly affects the concrete density. By considering the density, this study also provides a model for predicting the modulus of elasticity of the compressed and the uncompressed concretes, which covers the wide range of the compressive strength between 18 and 81 MPa. Finally, a comparison between the measured values of the modulus of elasticity and those calculated by the prediction models, given in ACI 318, ACI 363 and EC2, was performed, and then correction factors were proposed for the model codes to estimate the modulus of elasticity of the compressed concrete. The results showed that ACI 318 and ACI 363 models involving the concrete density yield correction factors close to one, while EC2 model involving a coefficient reflecting the effect of aggregate type gives a very higher value.

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Section: Relationship Between Compressive Strength and Densitysupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Hardened density of freshly compressed concrete and its effect on mechanical properties

Naghipour

Nematzadeh

Jalali

et al. 2014

European Journal of Environmental and Civil Engineering

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show abstract

“…and artificial (perlite, expanded shale, clay, slate, sintered PFA, etc.). Lightweight concrete can easily be produced by utilizing natural lightweight aggregate i.e., pumice or perlite aggregate [2]. Structural lightweight concrete has its obvious advantages of higher strength/weight ratio, better tensile strain capacity, lower coefficient of thermal expansion due to air voids in the lightweight aggregate [3,4].…”

Section: Introductionmentioning

confidence: 99%

Fuzzy logic model for prediction of mechanical properties of lightweight concrete exposed to high temperature

Tanyıldızı

2009

Materials & Design

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“…For most researches the presumption is used that, the flow at the channel centre is more stable than at the bank of the weir. Thus, the data at the upstream end of the side weir at the channel centre had been used by them [1,27,28,9,8,10]. However, in this study water profile in both of the centre line (line 1 in Fig.…”

Section: Methodsmentioning

confidence: 99%

Discharge coefficient for trapezoidal side weir

Nezami

Farsadizadeh

Nekooie

2015

Alexandria Engineering Journal

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The designed length of the rectangular side weirs sometimes becomes too long that makes it non-practical from the engineering point of view. In order to decrease the length of channel opening with the desired water height, this study focuses on applying trapezoidal geometry for side weirs. The discharge coefficient needs to be found experimentally for any kinds of trapezoidal side weirs. For this study experimental tests have been carried out for trapezoidal side weir in order to obtain the discharge coefficient. The main dimensionless variables for the tests include: Upstream end Froude number (F 1 ), w/y 1 , L/B, L 0 /L, w/L 0 and sin (a). Finally, the relationship for DeMarchi's coefficient in subcritical flow for trapezoidal side weir is presented based on the nondimensional parameters of weir and flow. Eventually, all the data points are within ±10% limit, which shows the accuracy of the results of this study. ª 2015 Production and hosting by Elsevier B.V. on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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The effects of different cement dosages, slumps and pumice aggregate ratios on the compressive strength and densities of concrete

Cited by 46 publications

References 1 publication

Hardened density of freshly compressed concrete and its effect on mechanical properties

Hardened density of freshly compressed concrete and its effect on mechanical properties

Fuzzy logic model for prediction of mechanical properties of lightweight concrete exposed to high temperature

Discharge coefficient for trapezoidal side weir

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