Mukaila Yinka Sanni, Ocholi Amana, and Pinder Ejeh Stephen
Mukaila Yinka Sanni, PhD scholar, Civil, Department of Civil Engineering, Ahmadu Bello University Zaria, 810001, Kaduna State, Nigeria, sannimukaila@yahoo.com
Ocholi Amana, Associate Professor, Department of Civil Engineering, Ahmadu Bello University Zaria, 810001, Kaduna State, Nigeria, amanaocholi@gmail.com
Pinder Ejeh StephenProfessor, Department of Civil Engineering, Ahmadu Bello University Zaria, 810001, Kaduna State, Nigeria, engrdrejeh@yahoo.com
ABSTRACT
This paper presents an experimental investigation into the response of modified masonry hollow concrete block units and wallette’s containing crumb-rubber from end-of-life tyres. Partial
replacement ratios of 0, 5, 10, 15, 20, and 25% crumb-rubber particles for coarse aggregate were investigated and presented in this paper. The unit weight, water absorption, compressive and
characteristics strength were tested. The results indicated that compacting factor and unit weight of fresh masonry concrete mixes reduced by 8.3% and 10.1% respectively also density of block units decreased from 2,079Kg/m3 to 1,686kg/m3 indicating a 19% reduction while the compressive strength of block units decreased from 9.43N/mm2 to 4.84N/mm2 indicating 49% loss in strength. Furthermore, the results revealed that the water absorption coefficient (Cw) of masonry concrete blocks increased by 53%. Characteristic compressive strength of masonry hollow concrete block wallette’s measured indicated a decrease with increase in crumb-rubber content with the reference masonry wallette’s having a strength of 6.44N/mm2 while 5, 10, 15, 20, and 25% crumb-rubber modified masonry concrete block wallette’s have strengths of 5.30N/mm2, 4.35N/mm2, 3.74N/mm2, 3.06N/mm2 and 2.25N/mm2 respectively indicating 65% reduction in strength. Despite the shortcomings observed in the strength reduction, load and non-load bearing masonry blocks and walls can be produced and constructed respectively with the modified masonry concrete blocks containing crumb-rubber content up to 20% and it will still meet up to the minimum strength requirement specified.
KEYWORDS: rubberized concrete, masonry, block, wallette’s, uniaxial, strength
