عنوان المقالة:الصدم والخواص الميكانيكية للبلاطات الفيروسمنتية المطرورة بالبوليمر Impact and Mechanical Properties for Ferrocement Slabs Modified by Polymer
Mohammed T. Nawar , Dr. Abdulkader Al-Hadithit and Dr. Khalil I. Aziz
المؤلفون بالإنجليزي
محمد طراد نوار و د.عبدالقادر الحديثي و د.خليل ابراهيم عزيز
الملخص العربي
Ferrocement is a type of thin reinforced concrete made of cement-sand mortar mixture with closely spaced of relatively small diameter wire meshes.
The main aim of this work was to study the mechanical properties and investigate the behavior of Ferrocement slabs under impact loading.
A total of 48 Ferrocement slabs were constructed and tested, 36 slabs tested under low velocity impact and 12 slabs tested under high velocity impact, in addition to 36 cubic specimens for testing compressive strength with dimensions (100×100×100 mm), 36 cylinder specimens for testing splitting tensile strength with dimensions (100×200 mm) and 36 prism specimens for testing flexural strength with dimensions (100×100×500mm).
The main parameter considered in the present investigation was number of wire mesh layers, content of (SBR) polymer and height of falling mass (falling velocity).
For low velocity impact, a special testing rig was used to achieve the impact forces using a falling mass (1300 gm steel ball) dropped from (2.5, 1.2, 0.83 m) height. (500 ×500×50 mm) slabs were used for each test. The number of required blows for the first crack and final failure was recorded.
The mode of failure and the crack pattern were also observed. For high velocity impact test, a (500×500×50 mm) slabs were tested by 7.62 mm bullets fired from a distance of (15 m) with a striking velocity of (720 m/sec.). The spalling, scabbing and perforation were observed and discussed. The results exhibited that the number of blows which were required to make the first crack and failure, increased with increase of polymer content and number of wire mesh layers. Also for high velocity impact test, it can be noted that the area of scabbing and area of spalling decreased with the increase of polymer content and number of wire mesh layers
compared with reference mixes. The compressive strength, splitting tensile strength and flexural strength increased with increase the polymer content.
محمد طراد نوار | Mohammed Tarrad Nawar | 1330