Direct Shear behavior of carbon fiber reinforced self-compacting concrete

مقدم أطروحة جامعية

Jumah, Ghazwan Ghanim

مشرف أطروحة جامعية

Sarsam, Qays Fuad
al-Attar, Tariq Salih

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم هندسة البناء و الإنشاءات

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2012

الملخص الإنجليزي

This work presents an experimental and theoretical investigation for the behavior of connections produced by using self-compacting concrete and subjected to direct shear.

The investigation also includes the effect of inclusion carbon fiber as reinforcement on self-compacting concrete (SCC) behavior in direct shear.

This study gives results of sixteen push-off or direct shear specimens in four groups.

Variations include volume faction for carbon £ber Vf 0.00%, 0.50 %, 0.75 % and 1.00 % for every percentage change in the steel reinforcement.

The steel reinforcement Pvffyvalues are 0.00 MPa, 2.66 MPa, 5.33 MPa and 7.99 MPa.

The main material properties studied include compressive strength, splitting tensile strength and modulus of rupture.

Measurements of deformations were made throughout testing.

The dimension of the shear plane in the push-off specimens was 170x185 mm.

The shear reinforcement was normal to the shear plane.

Specimens were cast by using SCC which is a kind of (high performance concrete) and reinforced with carbon fibers.

This work aims to investigate the direct shear behavior of SCC with or without carbon fiberat constant water to cementitious materials ratio of 0.3 by weight.

It is found that using carbon fiber increased the direct shear strength.

However, carbon £ber alone (without reinforcement) leads to brittle failure.

In contrast, adding rebars leads to higher strain and more ductile behavior—increased shear capacity is obtained when higher steel quantity is used.

The aim of adding carbon fibers was the increase of the horizontal strain (displacement).

It was found in this study that the optimum percentage of volume faction was 0.75 % for fresh and hardened concrete.

In addition, the effects of carbon fiber on the compressive strength of SCC lead to a drop in compressive strength compared with reference specimens.

This drop in f was 2.39 %, 8.38 % and 13.58 %, respectively for 0.50 %, 0.75 % and 1.00 %.

In contrast, the splitting tensile strength was increased by 3.34 %, 31.2 % and 18.2 % as compared with the cylinder strength without carbon fibers at 0.50 %, 0.75 % and 1.00 % respectively.

The modulus of rupture was increased by 11.9 %, 21.99 % and 13.83%as compared with SCC without carbon fibers at 0.50 %, 0.75 % and 1.00 % respectively.

Based on push-off failure tests from this work and those available in the literature, two equations have been established using regression analysis (software DataFit) statistic methods are called M1 and M2.

M1 depends on three variables f',Pvffyand Vf.

In contrast, M2 depends on three variablesfct,PvffyandVf.

Both methods have shown comparatively lower coefficient of variation (COV) values for the ratio of vE Xp ./ vc a ر .

for 273 direct shear tests in literature, as compared with other methods of predicting direct shear strength.

التخصصات الرئيسية

العلوم الهندسية والتكنولوجية (متداخلة التخصصات)

الموضوعات

• الخرسانة

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-419013