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NO-FINE LIGHTWEIGHT AGGREGATE CONCRETE MODIFIED WITH STYRENE BUTADIENE RUBBER | ||
| KUFA JOURNAL OF ENGINEERING | ||
| Article 1, Volume 1, Issue 2, 2010, Pages 33-44 | ||
| Authors | ||
| Ali T. Jasim; Qusay A. Jabal | ||
| Abstract | ||
| No-fines concrete is a form of lightweight concrete obtained when fine aggregate is omitted. No-fine concrete mainly used for both load bearing and non-load bearing for external walls and partitions and in in-filling panels in framed structures. The essential objective of this work is to investigate the effect of incorporation of polymer (SBR) on the performance of no-fine concrete made from lightweight aggregate (porcelinite) and to suggest possible applications of this type of concrete. Three concrete mixes with different aggregate/cement ratios (A/C) (6:1, 8:1 and 10:1) by volume were selected. Each of these mixes included six mixes which differed in polymer/cement ratios, (0%, 5%, 10%, 15% and 20%) by weight to find the optimum polymer/cement ratio. Density, compressive strength, splitting tensile strength and drying shrinkage were conducted on all concrete mixes. The test results showed that the compressive strength of no-fine lightweight aggregate concrete increased with the increase in polymer/cement ratio up to 15%, and the compressive strength reduced at polymer /cement ratio of 20% . At polymer/cement ratio of 15%, the percentage of increase in compressive strength measured relative to reference mixes was about 50%. On the other hand, the splitting tensile strength was increased with the increase in polymer/cement ratio for all mixes. The percentage of increase in splitting tensile strength compared with reference mixes increased from about 30 to 90% with the increase of polymer/cement ratio from 5 to 20 %. Also the drying shrinkage strains of no-fine concrete decrease, with the increase in polymer/cement ratio. The percentages of decrease in drying shrinkage strain at 56 days were from 5 to 30% with the increase of polymer/cement ratio from 5 to 20%. | ||
| Keywords | ||
| fine concrete; porcelinite aggregate; Styrene Butadiene Rubber; Compressive Strength; splitting tensile strength; Drying shrinkage | ||
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