The Effect of Filler Types and Superplastizier on the Workability and Splitting Tensile Strength of Self-Compacting Concrete

Apr 28, 2012

Journal Al-Rafidain Engineering Journal

Issue 2

Volume 20

AbstraAbstract Self-compacting concrete (SCC) is a special type of concrete that can flow through intricate geometrical configurations under its own mass without external or internal vibration or segregation. The objectives of the research work were to evaluate the effects of filler types (silica fume and limestone dust) and high- range water- reducing agent, (HRWRA, superplastizier-type Sikament -163) on the workability and splitting tensile strength of SCC. The experimental results showed the using silica fume and limestone dust in Self-compacting concrete led to a considerable improvement in splitting tensile strength. As the percentage of limestone powder and silica fume increases, the workability properties of SCC slightly decreased with increases in splitting tensile strength. The workability properties of SCC for all the replacements satisfy the recommended values given by specifications. Keywords: self-compacting concrete, silica fume, limestone dust, fillers, strengths, splitting, super plasticizers

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Preparing a Lightweight Aggregate from Local Row Materials and Studying the Properties of the Concrete Made from this Aggregate

Mar 8, 2011

Journal المؤتمر العلمي الثاني عشر لهيئة التعليم التقني

publisher هيئة التعليم التقني

The current paper tackles preparing a lightweight aggregate from local row materials. Clay soils were selected from Al-fatha formation at Hay Al-Arabi in Mosul. In order to improve the properties of these clay soils, window glass wastes were added to these soils, since glass contains a high percentage of silica. The mixtures were prepared manually after adding 5% organic materials (peanut peels). Then, the mixtures were exposed to high temperatures (1050, 1100, and 1150) oC for long periods, and then they were cooled immediately to the room temperature. Common physical tests which are conducted on natural coarse aggregate were applied to the mixtures, where density, specific gravity, absorption and grading were measured. The results were compared with these of the natural coarse aggregate tests; hence, the prepared lightweight aggregate was classified as a construction aggregate. A group of standard testing cubes of (10x10x10) cm were prepared from a concrete containing the lightweight aggregate and were tested after 7 and 28 days. The results showed that, according to standard specifications, the resulted concrete is a lightweight concrete with a very good insulation.