The objectives of the study was to determine the quality attributes of the aggregates such as sand and pea gravel as to sieve analysis, moisture content, unit weight/mass determination, specific gravity, and absorption; to determine the compressive strength of the concrete hollow blocks using two different treatments- 1:2:4+0% (without abaca fiber) and 1:1.88:3.76+6% (with abaca fiber) after 14 days curing period; to determine the significant mean difference between the two treatments; and to determine the cost and return analysis. Tests showed that on the 14th day of curing, the CHB samples with abaca fibers attained a compressive strength of 500 psi, the minimum value stipulated in ASTM C129 for hollow non-load bearing concrete masonry unit. It’s not only about the addition of abaca fiber that improved the CHB, but equally significant is the potential of recycling materials for a better environment and the economic impact in communities where abaca industry is active.The difference between the two treatment means is significant material at 5% level. Hence, the CHB with abaca fiber has higher compressive strength than the CHB without abaca fiber. CHB A with a design mix of 1:2:4+0% abaca fiber can produce 55 pcs. Per bag of cement at Php10.00 per block while CHB B with a design mix of 1:1.88:3.76+6% abaca fiber can also produce 55 pcs at Php9.90 per block with a return of investment of 19% for one year.
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