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BREADFRUIT STEM ASH AS A PARTIAL REPLACEMENT OF CEMENT IN SANCRETE BLOCK MAKING.

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Author(s): Aginam, C. H.

Journal: International Journal of Engineering Research and Applications
ISSN 2248-9622

Volume: 3;
Issue: 4;
Start page: 60;
Date: 2013;
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Keywords: pozzolans | breadfruit stem ash | compressive strength | curing | sandcrete | partial replacement.

ABSTRACT
Sandcrete blocks are the most widely used materials for walling units in Nigeria. This study investigated the use of breadfruit stem ash(BFSA) as a partial replacement of cement in sandcrete block making. The breadfruit stem ash was burnt using a local burner and analysis was carried out on the chemical and physical properties of the ash. Four blocks each (150x150x150 mm) were cast at 0%, 5%, 10%,20%, 25%, 30%, 40% and 50% replacement levels. The cubes were crushed at 7, 28, and 48 days of curing. The results show that thecompressive strength varied from 1.5N/mm2to6.5N/mm2for the replacement levels at 48 days of curing. The 50% to 20% replacement levels displayed very low compressive strengths which were between the ranges of 1.5N/mm2 and 2.1N/mm2. This is far below the specification of the Nigerian Industrial Standard (NIS) [12]. At the 0% replacement level, when there was no ash content, the compressive strength was observed to be 4.3N/mm2, 5.8 N/mm2, and 6.5 N/mm2respectively at 7days, 28days, and 48 days respectively. This is pretty above the minimum compressive strength as specified by the standard. Consequently, despite the fact that the BFSA possessed some compositions of pozzolans, it did not qualify for partial replacement of cement in sancrete at quantities above 10% of the binder.
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