Effects of Uncrushed Aggregate on the Mechanical Properties of No-Fines Concrete

M. A. Memon, M. A. Bhutto, N. A. Lakho, I. A. Halepoto, A. N. Memon

Abstract


Concrete’s self-weight is a major aspect of a structure’s overall weight. Recently, the use of lightweight concrete (no-fines, foamed and cellular concrete) has been increased. Normally no-fines concrete is produced with crushed coarse aggregate of uniform gradation. This study aims to investigate experimentally the effects of the use of uncrushed coarse aggregates on unit weight, compressive and tensile strength of the no-fines (NFC) as well as conventional concrete (CC). In addition, the effects of coarse aggregate size on the mechanical properties were also studied. Four gradations of uncrushed coarse aggregates ranging between (5.5-4.75) mm, (10-4.75) mm, (20-4.75) mm and (25-4.75) mm were used for preparing the concretes. The fixed cement-aggregate ratios of 1:6 (with w/c ratio=0.4) and 1:2:4 (with w/c ratio=0.5) were adopted for NFC and CC respectively. It was found that the gradation of uncrushed coarse aggregate has a significant effect on the mechanical properties of NFC. A maximum of 16% reduction in self-weight of the concrete without fines was obtained, as compared to that with fines. Moreover, the compressive strength of no-fines concrete significantly improved by replacing crushed with uncrushed coarse aggregate. The compressive strength increased by 16% for the batch of (25-4.75) mm.


Keywords


no-fines concrete; uncrushed aggregate; unit weight; compressive strength

Full Text:

PDF

References


Z. A. Tunio, Experimental Investigation of Strength of No-fines Concrete with various course aggregate gradation, M.E, Quaid-e-Awam Univeristy of Engineering Scince & Technology, 2015

N. Newman, P. Owens, “Properties of lightweight concrete”. In Newman, J. and Choo, B.S. (eds.) Advanced Concrete Technology, Butterworth-Heinemann, 2003

C. J. Chang, Y. C. Chang, “Extra-Lightweight No-fines cellular concrete-use for non-structural material”, Advanced Material Research, Vol. 834-836, pp. 713-716, 2014

J. A. Bogas, M. G. Gomez, A. Gomes, “Compressive Strength Evaluation of Structural Lightweight Concrete by Non-destructive Ultrasonic Plus Velocity Method”, Ultrasonics, Vol. 53, No. 5, pp. 962-972, 2013

M. Carsana, F. Tittarelli, L. Bertolini, “Use of No-Fines concrete as a Building Materials: Strength, Durability Properties and Corrosion protection of embedded steel”, Cement and Concrete Research, Vol. 48, pp. 64-73, 2013

A. K. I. Al-Hadithi, S. B. Al-Nu’man, I. A. Al-Jumaily, “Some properties of No-fines Polymer concrete”, Journal of Engineering and Development, Vol. 11, No. 3, pp. 1-13, 2013

A. Malik, “An Experimental Study on Properties of No-Fines Concrete”, Imperial Journal of Interdisciplinary Research (IJIR), Vol. 2, No. 10, pp. 2075-2079, 2016

M. A. Kabir, K. M. S. Islam, “Performance study on no fines concrete”, 3rd International Conference on Civil Engineering for Sustainable Development (ICCESD), KUET, Khulna, Bangladesh, 2016

A. A. Muttar, “Improving The Mechanical Properties of No- Fines Concrete”, Journal of Babylon University/ Engineering Sciences, Vol. 21, No. 2, 2013




eISSN: 1792-8036     pISSN: 2241-4487