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دراٍشة تجريبية لتعيين المقاومات المميزة على الشد و على الضغط للجدران الحجرية الكلسية الطبيعية باستخدام المونة الكلسية المقواة بالألياف الزجاجية

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 Publication date 2017
and research's language is العربية
 Created by Shamra Editor




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Experiments Has been made on lime mortar which have a weak resistance so we added materials like pozolan, and bricks to improve the mechanical properties of the mixture, as we added fiberglass to the mix, and study their effect on the mechanical properties of mortar, also experiments has been made on natural limestone which used in the construction, experiments on samples of mural prismatic composed of stone and mortar to see pressure strength of mural samples, and mural samples subjected to curvature to determine tensile strength of stone walls with limestone mortar reinforced with fiber glass. We observed increase in the mural samples tensile strength about 73% when we added a small amount of fiber glass doesn't exceed 2% of the proportion of the existing lime in the mixture, which shows the effective improvement in the mortar extracted specifications.

References used
ASTM C1018-97,1997- Standard Test Method for Flexural Toughness and First-Crack Strength of FiberReinforced Concrete.(Using Beam with Third-Point Loading.); ASTM International: West Conshohocken, PA, USA
ASTM, E 447-92b-Standard Test Method for Compressive Strength of Masonry Prisms, American Society for Testing and Materials (ASTM), Pennsylvania,987-990
ASTM C1314-95 Standard Test Method for Constructing and Testing Masonry Prisms Used to Determine Compliance with Spcified Copressive Strengh of Masonry American Society for Testing and Materials (ASTM), Pennsylvania,853-855
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Analysis of The results for one of the most important experimental tests on masonry arches strengthened at their extrados or at their intrados by fiber reinforced polymer (FRP)strips;shows that the presence of the fibers prevents the brittle coll apse that occur in plain arch because of formation of four hinges, therefore (depending on position and amount of reinforcement) in strengthened arches, there are three possible mechanisms : 1- masonry crushing , 2- detachment of fibers, and 3- sliding along a mortar joint due to the shear stresses. Some analytical approaches describing these mechanisms are discussed and a comparison between the theoretical values that give and the experimental results was performed to show the agreements , according to analytical study of the experimental results strengthening by fibers enhances the strength and ductility of strengthened arches, the width of strips and the bond between them and masonry are so important to perform optimum strengthening.
The aim of this study is improving the durability of precast products of Glass Fiber Reinforced Concrete (GRC) and in the context of sustainability applications, reduction of cement consumption and replacement of it with green materials. This study has been done to test the role of the natural pozzolan from Shihan Hill in As Suwayda as supplementary cementing material by 10% -15% -20% - 25%, and to determine the effect of it on the consistency and flexure strength over 180 days, as well as to test its role in improving the micro-structure of the mixture by reducing the content of Ca(OH)2 and increasing C-S-H & C-A-S-H gel, which were tested using X-Ray Diffraction (XRD) and Energy Dispersive X-Ray (EDX) techniques, and as a result reduced the erosion of fibers as shown in images by Scanning Electronic Electron Microscopy (SEM). Moreover the role of pozzolana has been studied in controlling the degradation of the material over time which tested by immersion in hot water 50° for 150 days and by drying – wetting cycles. Also the effect of pozzolana on absorption, porosity and resistance of sulfates attacks was studied. The results have shown that the used natural pozzolana has no negative effect on consistency or mechanical properties, and it improved all the studied durability factors.
This research aims to study the effect of heat treatment on curing of reinforced Unsaturated Polyester Resin (UPR) with fiberglass, and to study the effect of storage time and the time of exposure to natural aging on curves absorption. The results showed that it is very difficult to reach a fully curing to UPR matrix, and Storage samples for three years reveal resistance to degradation in fresh and seawater comparing with storage samples for three months, or aging by exposed to environmental for three years. The results showed also that the absorption occurs by thin film, and not prevent by increasing the layers of reinforcement
مساهمة في استصلاح الترب الكلسية باستخدام حمأة الصرف الصحي في منطقة المخرم ( محافظة حمص ): تم تنفيذ تجربة حقلية في قرية أبو العلايا ذات التربة الكلسية من منطقة المخرم
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