No-fine lightweight aggregate concrete modified with styrene butadiene rubber

الملخص EN

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 %.