This paper presents the use of Ethiopian pumice and scoria aggregates for lightweight concrete in ribbed slab construction. Experimental and theoretical investigations were conducted to study the strength and deformation characteristics of ribbed-slabs with 60 mm topping. The experimental program was dedicated to the study of mix design for the production of all-lightweight structural concrete and full size ribbed slab testing. Theoretical investigations were conducted parallel to the experimental investigations. Mixtures developed with scoria aggregates have attained required strength and density to be accepted as structural lightweight concrete; however, pumice cannot be used as structural concrete. Experimental investigations showed that ribbed-slabs can be constructed using scoria aggregates with 40 - 47% fine content, 1.6 – 1.8 A/C ratio and 0.4 W/C in range of normal cement content.
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机译：本文介绍了埃塞俄比亚浮石和氧化渣骨料在肋板施工中用于轻质混凝土的用途。进行了实验和理论研究，以研究打顶60 mm肋板的强度和变形特性。该实验程序专门用于混合料设计的研究，以生产全轻质结构混凝土和全尺寸带肋平板试验。理论研究与实验研究平行进行。用氧化渣骨料开发的混合物已经达到了要求的强度和密度，可以被认为是结构轻质混凝土。但是，浮石不能用作结构混凝土。实验研究表明，肋骨板可以使用具有40-47％细度，1.6-1.8 A / C比和0.4 W / C（正常水泥含量范围）的碎石骨料来建造。
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