TY - JOUR ID - TI - Improving Strengths of Porcelanite Aggregate Concrete by Adding Chopped Carbon Fibers تحسین مقاومات خرسانة االبورسیلانایت الخفیفة الوزن باستخدام الیاف الكاربون AU - Sheelan M. Hama شیلان محمود حمھ AU - Shaho Mahmoud Hama شاھو محمود حمھ AU - Mohammed H. Mhana محمد حمود مھنا PY - 2018 VL - 21 IS - 1 SP - 161 EP - 165 JO - Al-Nahrain Journal for Engineering Sciences مجلة النهرين للعلوم الهندسية SN - 25219154 25219162 AB - In this work chopped carbon fibers are used to improve tensile strength of Porcelanite lightweight aggregate concrete. Silica fume was added in order to improve the mixes compressive strength. Silica fume increase water demand and using fibers reduce workability, to improve workability and decrease water demand high rang super plasticizers are used. The results showed that compressive strength, splitting tensile strength, modulus of elasticity of carbon fibers Porcelanite lightweight aggregate concrete increase with increasing of carbon fiber up to 2% compared to reference Porcelanite lightweight aggregate concrete without fibers. The percentages of increasing were 14.40%, 68.00%, and 10.66% for compressive strength, splitting tensile strength, and modulus of elasticity, respectively. Flexural Strength continues in increase with increase of fibers. The dry unite weight of mixes with chopped fiber decrease with increase of fiber percentage. Besides the chopped carbon improved the ductility of Porcelanite lightweight aggregate concrete and that clear from stress-strain relationship.

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