Strength of Blended Cement Sandcrete & Soilcrete Blocks Containing Sawdust Ash and Pawpaw Leaf Ash

International Journal of Engineering Inventions e-ISSN: 2278-7461, p-ISSN: 2319-6491
Volume 2, Issue 8 (May 2013) PP: 35-40

Strength of Blended Cement Sandcrete & Soilcrete Blocks
Containing Sawdust Ash and Pawpaw Leaf Ash
L. O. Ettu1, J. I. Arimanwa2, F. C. Njoku3,
A. P. C. Amanze4, U. G. Eziefula5
1,2,3,4

Department of Civil Engineering, Federal University of Technology, Owerri, Nigeria
5
Department of Civil Engineering, Imo State Polytechnic,Umuagwo, Nigeria

ABSTRACT: This work investigated the compressive strength of binary and ternary blended cementsandcrete and soilcreteblocks containing sawdust ash (SDA) and pawpaw leaf ash (PPLA). 135 solid sandcrete blocks and
135 solid soilcrete blocks of 450mm x 225mm x 125mm were produced with OPC-SDAbinary blended cement,
135with OPC-PPLAbinary blended cement, and 135with OPC-SDA-PPLAternary blended cement, each at percentage OPC replacement with pozzolan of 5%, 10%, 15%, 20%, and 25%.Three sandcrete blocks and three soilcreteblocks for each OPC-pozzolan mix and the control were crushed to obtain their compressive strengths at 3, 7, 14, 21, 28, 50, 90, 120, and 150 days of curing.Binary and ternary blended cementsandcrete and soilcrete block strength values were found to be higher than the control values beyond 90 days of hydration at
5-20% OPC replacement with pozzolan. The 150-day strength values for OPC-SDA-PPLA ternary blended cement sandcreteand soilcrete blocks were respectively 6.00N/mm2and 5.20N/mm2 for 5% replacement,
5.90N/mm2and 5.10N/mm2 for 10% replacement, 5.75N/mm2and 5.00N/mm2for 15% replacement, and
5.70N/mm2and 4.90N/mm2for 20% replacement; while the control values were 5.20N/mm2 and 4.80N/mm2.
Thus, OPC-SDA and OPC-PPLA binary blended cements as well as OPC-SDA-PPLA ternary blended cement could be used in producing sandcrete and soilcreteblocks with sufficient strength for use in building and minor civil engineering works where the need for high early strength is not a

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