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Enhancing the Compressive Strength and Density of Cement Mortar by the Addition of Different Alignments of Glass Fibers and Styrene Butadiene Rubber
تحسين مقاومة الانضغاط للملاط باستخدام توزيع مختلف من الياف الزجاج ومستحلب الستايرين بيوتادايين

Authors: Besma M. Fahad بسمة محمد فهد --- Mustafa M. Hamza مصطفى محمد حمزة
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2017 Volume: 13 Issue: 3 Pages: 108-119
Publisher: Baghdad University جامعة بغداد

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Abstract

In the field of construction materials the glass reinforced mortar and Styrene Butadiene mortar are modern composite materials. This study experimentally investigated the effect of addition of randomly dispersed glass fibers and layered glass fibers on density and compressive strength of mortar with and without the presence of Styrene Butadiene Rubber (SBR). Mixtures of 1:2 cement/sand ratio and 0.5 water/cement ratio were prepared for making mortar. The glass fibers were added by two manners, layers and random with weight percentages of (0.54, 0.76, 1.1 and 1.42). The specimens were divided into two series: glass-fiber reinforced mortar without SBR and glass-fiber reinforced mortar with 7% SBR of mixture water. All specimens were tested after curing for 7 and 28 days, glass-fiber reinforced mortar exhibited better properties than control mortar in improvement of compressive strength and lowering the density after curing for 28 days due to the completion of cement hydration reaction.. For compressive strength the best results were achieved with 1.42 wt.% layers glass-fiber reinforced mortar with 7% SBR which gave 41.56 MPa. On the other hand, the addition of 1.42 wt.% random glass-fiber without SBR addition caused the beast reduction in density by 10.6% and produced lighter structure than control sample.

الملاط المدعم بألياف الزجاج والمضاف لها مستحلب ستايرين بيوتادايين (SBR) تعد من المواد الحديثة في مجال المواد الإنشائية. يهدف هذا البحث لدراسة تأثير اضافة الياف الزجاج العشوائية وطبقات الياف الزجاج على كثافة و مقاومة انضغاط الملاط مختبرياً في حالة وجود او عدم وجود مادة (SBR). تم تحضير خلطات من الملاط بنسبة خلط وزنية 1:2 ) اسمنت- رمل ( ونسبة الماء الى الإسمنت (0.5). تم اضافة الياف الزجاج بطريقتين عشوائية وطبقات بنسب وزنية (0.54, 0.76, 1.1, 1.42). قسمت العينات الى سلسلتين احداهما مدعمة بألياف الزجاج بدون اضافة (SBR) والأخرى مدعمة بألف الزجاج مع اضافة 7% (SBR) من ماء الخلطة. تم فحص العينات بعد غمرها بالماء لمدة 7 و 28 يوماً. الملاط المدعم بألياف الزجاج أظهر تحسينا في مقاومة الانضغاط مقارنة مع عينات القياس. اما افضل النتائج كانت مع العينات المدعمة بألياف الزجاج والمضاف لها 7% (SBR). الإنضاج بعمر 28 يوماً اظهر افضل النتائج بسبب اكتمال تفاعل الماء مع الإسمنت.


Article
Effect of SiC Particulate on Glass Fibers Reinforced Polymer Composites in Erosive Wear Environment

Authors: R.H. Abdel-Rahim --- Z.F. Atya
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 2 Part (A) Engineering Pages: 118-123
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this study the physical property, mechanical properties and erosion wear of pure epoxy and hybrid composites were studied. Composites were prepared and investigated by Hand lay-up molding. Pure epoxy and hybrid compositions were prepared, 4% and 8% volume fractions of glass fibers as reinforcement and 4% and 8% of SiC as filler particles. The investigated physical property is density while the mechanical property was hardness. Solid particles erosion wear tests are also carried out. The experimental results showed that increased volume fraction of glass fibers to (8%) led to increase the (density). The maximum density is equal (1.661gm/cm3). Hybrid composite with (Epoxy +8%GF+8%SiC) has the maximum hardness of (82) shore D. The particle-contained water jet type experimental erosion test results that the reinforcement volume fraction as well as particles distribution and bonding has considerable effect on the wear of epoxy composites. It was found that the better resistance was for hybrid composites (Epoxy+8%GF+4%SiC) at angle 30°, erodent size 800 μm, and time 10 hour.


Article
Effect of Silica Powder Addition on Mechanical Properties of Polymer Laminate Composite

Authors: F.A. Hashim --- M.S. Hamza --- R.R. Abdullah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 7 Part (A) Engineering Pages: 737-740
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this study laminate composites were prepared, one was reinforced with three layers of kevlar fibers at (Vf = 17.89%) and the second was reinforced with hybrid laminate with sequence of layers (Kevlar-Glass-kevlar (KGK)) at (Vf = 15.3%), samples were tested before and after silica addition at volume fraction (3%). Tests were (tensile, flexural, impact, hardness, and optical microscope), hand lay-up technique used to prepare samples. Matrix was unsaturated polyester resin. Results showed that mechanical properties (tensile strength, flexural strength, and fracture toughness) decreased after silica addition from (190 MPa, 610 MPa, 35.6 MPa.m1/2 ) to (100.5 MPa, 212MPa, 27.7 MPa.m1/2 ) respectively for composite reinforced with three layers of Kevlar fibers at (Vf = 17.89%) and from (175.5 MPa, 387 MPa, 32.36 MPa.m1/2 ) to (67.6 MPa, 210 MPa, 23 MPa.m1/2 ) respectively for laminate composite with layers (Kevlar-Glass-Kevlar (KGK)) at (Vf = 15.3%). Hardness increased after addition of silica from (79.25 to 81.2) for composite with three layers of Kevlar fibers at (Vf = 17.89%) and from (80 to 82.3) for composite with layers (Kevlar-Glass-Kevlar (KGK)). Optical microscope showed that layers were distributed in matrix and addition of silica leads to delamination of composite after using flexural test.

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