research centers


Search results: Found 2

Listing 1 - 2 of 2
Sort by

Article
Improving Mechanical Properties of Polymer Modified Concrete Using Micro-Steel Fiber and Silica Fume

Author: Muhammad Abed Attiya
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2017 Volume: 25 Issue: 1 Pages: 212-223
Publisher: Babylon University جامعة بابل

Loading...
Loading...
Abstract

The use of Steel Fiber Reinforced Concrete (SFRC) is to improve the structural behavior such as increasing the resistance to cracking and crack propagation. This work has been made to study the properties of polymer modified concrete when micro-steel fiber is incorporated at different volumetric percentages from 0.1 % to 2 %. Two mixes (1:1.5:2 and 1:2:4) have been used and modified with styrene butadiene rubber resin (SBR) and silica fume with maintaining water cement ratio at 0.45. It has been found that increasing steel fiber content in concrete has a significant influence on the increase compressive, tensile, flexural strength, modulus of elasticity and stress- strain relationship. Flexural strength increases from 4.14 MPa (for 0% steel fiber) to 11.83 MPa (for 2% steel fiber). Whereas, the modulus of elasticity is improved by about 77% (for 1:1.5:2 mixes) and 91% (for 1:2:4 mixes).

تستعمل الخرسانة المسلحة بألياف الحديدِ (SFRC) لتحسّينَ السلوكَ الإنشائي مثل زيَاْدَة مقاومة التَصَدُّع والحد من تمدد التشققات. في هذا البحث تم دراسة تأثير إضافة ألياف الحديد (micro-steel fiber) كنسب مئوية حجميه مختلفة تتراوح من 0.1 % إلى 2 % على خواص الخرسانة المعدلة باستخدام مضافات البوليمرات (polymer modified concrete). حيث تم استخدام نوعين من الخلطات ((1:1.5:2 و1:2:4) ومع نوعين من المضافات هما styrene butadiene rubber resin (SBR) و silica fume مع بقاء نسبة الماء/ سمنت ثابته (0.45). وُجِدَ إن زيادة محتوى ألياف الحديد في الخرسانةِ لَهُ تأثير واضح على زيادة مقاومة الانضغاط، الشد والانثناء. وكذلك زيادة قيم معامل المرونة وتحسن علاقةِ الإجهادِ-الانفعال stress-strain relationship. ِلوحظ خلال هذه الدراسة إن مقاومة الانثناء ازدادت من 4.14 MPa بدون استخدام ألياف الحديد (0% steel fiber) إلى 11.83 MPa باستخدام ألياف الحديد بنسبة (2% steel fiber). كذلك معامل المرونة تحسن بنسبة 77% للخلطة (1:1.5:2 ) و بنسبة 91% للخلطة (1:2:4).


Article
Nonlinear Finite Element Modeling For High Strength Fibrous Reinforced Concrete Beams
إستخدام العناصر المحددة غير الخطية لتحليل العتبات الخرسانية المسلحة عالية المقاومة والمعسزة بالألياف الفولارية

Authors: Jaza Hassan Muhammad جزا حسن محمد --- Mohamed Rauof Abdulkadir محمد رؤوف عبدالقادر
Journal: Sulaimania Journal for Engineering Sciences مجلة السليمانية للعلوم الهندسية ISSN: 24101699/24156655 Year: 2017 Volume: 4 Issue: 4 Pages: 14-27
Publisher: university of Sulaimania جامعة السليمانية

Loading...
Loading...
Abstract

This paper presents a nonlinear finite element model to investigate the influence of steel fibers on the flexural strength of high strength reinforced concrete beams. Two methods had been used to model the steel fiber using ANSYS 14. In the first model the effect of steel fiber on the mechanical properties of concrete has been neglected, and the steel fiber considered as smeared reinforcement. In the second model the effect of steel fiber on the mechanical properties of concrete is considered in material modeling. The theoretical results were compared with the experimental result. And the variable present in both models was fiber volume fraction (0.00, 0.75, and 1.5) %. The experimental beams consist of high strength steel fiber reinforced concrete rectangular beams with sectional dimension ( 150 x 100 ) mm and overall length (3000) mm simply supported, and loaded through two points loading, those beams are used for verification of the proposed models. Results showed that the first model is more reliable and compatible with experimental results than the second model. The analytical models also showed that increase in volume fraction of steel fiber improves the flexural rigidity and flexural strength of the high-strength fiber reinforced concrete beams.

Listing 1 - 2 of 2
Sort by
Narrow your search

Resource type

article (2)


Language

English (2)


Year
From To Submit

2017 (2)