Civil Engineering and Architecture Vol. 11(5A), pp. 3154 - 3161
DOI: 10.13189/cea.2023.110825
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Effect of Mixing Time on Some Hardened Concrete Properties


Mohammed Salman Al-lami 1, Diala Atiyat 2,*, Mutaz Qutob 1
1 Department of Civil Engineering, Faculty of Engineering, Isra University, Jordan
2 Department of Architecture Engineering, Faculty of Engineering, Isra University, Jordan

ABSTRACT

The mixing time of ready-mixed concrete may be prolonged for many reasons, which may affect the resulting properties in its fresh and hardened states. The effects of prolonged mixing time on the slump, compressive strength, porosity, and permeability of concrete were investigated in this paper. All mixtures were prepared with the proportion 1:1.5:2 by weight for cement, fine aggregate, and coarse aggregate, respectively. The investigated variable was the effect of water-to-cement ratios, which were 0.40, 0.45, 0.55, and 0.65. The materials were continuously mixed up for 15, 60, 120, and 240 minutes without any additional mixing water. To reduce the evaporation of the mixing water, the drum opening was tightly covered with a polyethylene perforated film. The results showed an increasing trend in the coefficient of permeability values with mixing time for all mixtures except for the mixture with a water-to-cement ratio of 0.65 which showed a reduction in value. A different trend of results for the coefficient of permeability in comparison with that for porosity was observed. The prolonged mixing time (longer than 90 minutes discharged limit specified by ASTM) does not cause a negative effect on compressive strength as long as it has workability that facilitates the casting process, as the mixtures with higher water-to-cement ratios showed an increasing trend in compressive strength.

KEYWORDS
Concrete Properties. Mixing Time, Compressive Strength, Permeability, Porosity

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Mohammed Salman Al-lami , Diala Atiyat , Mutaz Qutob , "Effect of Mixing Time on Some Hardened Concrete Properties," Civil Engineering and Architecture, Vol. 11, No. 5A, pp. 3154 - 3161, 2023. DOI: 10.13189/cea.2023.110825.

(b). APA Format:
Mohammed Salman Al-lami , Diala Atiyat , Mutaz Qutob (2023). Effect of Mixing Time on Some Hardened Concrete Properties. Civil Engineering and Architecture, 11(5A), 3154 - 3161. DOI: 10.13189/cea.2023.110825.