Abstract:
Concrete can found everywhere around the world. It has dominated world multi-story
commercial and residential building. Slabs take the highest cost Percentage of the total volume
over the other structural load bearing Members. Nowadays, one of the most common floor
systems is ribbed slab concrete. The conventional available hollow concrete block size results
its limitation on the concrete slab thickness. Hollow blocks construction provides facilities for
electrical conduit, water and soil pipes. It saves cement in construction work, bringing down
cost of construction considerably.
The objectives were study on properties of aggregates used for production of ribbed slab HCB
in Ethiopia.To identify the physical property of aggregates and compare the result with different
standards. The other objective were to find out effect of each different aggregates property on
production of ribbed slab HCB .The effects are expressed by using compressive strength,
density of the block and dry shrinkage tests and compare the result with ES. The aggregates
are classified based on density: pumice, red ash (scoria)and crushed (01) aggregates.The HCB
used in this study are casted using prelisted aggregates and combination of those three
aggregates..
The studywas conducted in terms of quantitative methods. The study designs used for this
research were comparative and lab based study. The laboratory test was conducted
compressive strength of HCB agefor 7, 14 and 28 day.
From the result crushed aggregate had highest specific gravity than pumice and red ash
aggregate.It indicates low porosity therefore high durability and high strength had gainThe
water observation of Crushed aggregate was lowest value .Which indicated that during mix
design, water cement ratio would depended on this value.Mixed of three aggregate had largest
compressive strength relative to crushed ,red ash and pumice HCB. Their Compressive
strength respectivelyare 2.3, 2.13, 2 and 1.95 Mpa.
