تأثير الألياف الفولاذية على مقاومة الضغط والشد للخرسانة عالية المقاومة

الملخص

 The marked brittleness with low tensile strength and strain capacities of high-strength concrete (HSC) can be overcome by the addition of steel fibers. This research investigated the effects of hooked-end steel fiber content with different silica fume (S.F.) content on the mechanical properties of HSC.

This study depends on 3 main reference concrete mix contains silica fume (5%, 10%, 15%) as a percentage of the weight of cement. and Also, 3.5% of the super plasticizers type (Plastocrete ®-N) has been added to all concrete mixes.

The steel fibers were added at the volume fractions of (0.2 %, 0.4 %, 0.6 %, 0.8 %,1 %). Compressive and splitting tensile strengths were conducted.

The main conclusions were that the compressive strength and splitting tensile strengths of the fiber-reinforced concrete enhanced by 10% and 50% respectively at 1.0% volume fraction, and 10% of S.F.

Strength models were established to predict the splitting tensile strengths by knowing the compressive strength and a model to predict a compressive Strength by using enhancement factor.