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Register a new userA Research study of the effect of using basalt local pebbles (graves) on hardened (rigid) concrete specification
"دراسة بحثية لتأثير استخدام الحصويات البازلتية المحلية على مواصفات الخرسانة المتصلبة "
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Tishreen University ورقة بحثية
Publication date
2018
fields
Structural Engineering
and research's language is
العربية
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Shamra Editor
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تبحث هذه الورقة دراسة عملية مخبرية لإمكانية الاستفادة من مورد هام من الموارد الطبيعية المتوفرة في القطر، و هو البازلت المتواجد بكميات كبيرة في المنطقة الجنوبية (السويداء)، لبيان مدى تحقيقه لمتطلبات المواصفات القياسية لاستعماله في تصنيع الخرسانة و ذلك من خلال اختبار مقاومة الضغط و الشد بالانفلاق و معامل المرونة للخرسانة المتصلبة بأعمار مختلفة (28-7-3) يوم. و في النتيجة تبين أن اختبارات المقاومة على الضغط ازدادت بنسبة 20% تقريباً مع تقدم عمر الانضاج للخلطات الخرسانية. كما أن المقاومة على الضغط للخلطات الخرسانية المحضرة باستعمال الحصويات البازلتية المدروسة كانت أعلى بنسبة 18 % تقريباً من مقاومة الضغط للخرسانة المصنعة باستعمال الحصويات الكلسية في الأعمار فوق (7) يوم. كما تبين انخفاض طفيف بنسبة 8% في مقاومة الشد بالانفلاق للعينات المحضرة بالحصويات البازلتية المدروسة على العينات المحضرة باستعمال حصويات كلسية و ازدياد هذه المقاومة مع الزمن. أما معامل المرونة فقد لوحظ ازدياد معامل المرونة للبيتون بنسبة 20% مع تقدم عمر الإنضاج للخلطات الخرسانية مقارنة بالخلطة المرجعية.
This paper studies a practical laboratory research of the possibility of utilizing the natural resources available in the country, namely Basalt, which is available in large quantities in the southern region (Al-Suwayda) in order to demonstrate the extent to which it meets the requirements of standard specifications for use in the manufacture of (Reinforced) concrete by means of testing the resistance of pressure and tensile by splitting and the elasticity coefficient of hardened (rigid concrete) at Different ages (3-7- 28) days. As a result, pressure resistance tests increased by approximately 20 % with the maturating period progress of concrete mixtures. The pressure resistance of concrete mixtures prepared using basalt pebbles was approximately 18% higher than the pressure resistance of concrete formed usingcalcite(calcareous) pebbles in ages above 7 days There was also a slight decrease of 8% in the split tensile resistance of the studied samples prepared with basalt minerals , compared with the samples prepared using calcite (calcareous) pebble and this resistance increases over time . As for the elasticity coefficient , a 20% increase in the elasticity coefficient of the concrete was noticed with the maturating of the concrete mixtures compared to the referential mixture.
References used
HAMAD ALLAH MOHAMMAD AL-BAIJAT, "The Use of Basalt Aggregates in Concrete Mixes in Jordan”، Jordan Journal of Civil Engineering, Volume 2, No. 1, 2008
EZELDIN, A. S. AND AITCIN, P.-C. "Effect of Coarse Aggregate on the Behavior Of Normal and High-Strength Concretes," Cement, Concrete, and Aggregates, CCAGDP, V. 13, No.2, 1991, 121-124
KAPLAN, M. F. "Flexural and Compressive Strength of Concrete as Affected by The Properties of Coarse Aggregate,'' ACI Journal, Proceedings V. 30, No. 11, 1959, 1193-1208
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This paper studies a practical laboratory process of the possibility of benefiting from an
important resource of the natural resources available in the country, namely "Basalt"
which is found in large quantities in the southern region (As-Suwayda)
to demonstrate
how much it meets the requirements of Standard Specifications for use in the manufacture
of concrete by testing five design mixtures of concrete , of which the cubic dimensions are
(15% x 15) cm and the cylindrical dimensions are (15 * 30 cm) with different percentages
of the basaltic and dolomitic calcareous compounds used in them as follows: (0% basalt
and 100% lime),( 25% basalt and 75% lime) , (50 % basalt 50 % lime) (75% basalt 25%
lime), (100%basalt and 0% lime) on the strength of pressure and tensile strain by
Splitting and Moduls of Elasticity of ages (28-7-3) days, and its effect on the behavior of
Reinforced Structural Elements susceptible to shear and Bending through testing
Reinforced beams of dimensions (16 × 12 × 200) cm on shear, Bending and cracking
Moduls (Coefficient) with ages of (14-28) days.
Using different alternative materials in concrete mix, and expanding the area of using these materials, is considered very important from scientific, economic, and environmental point of view. Especially the diversity in number of used aggregates. As
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studies about Syrian basalt were not enough. The lack of proper mills or crushers to grind basalt to be good to prepare concrete mix. As a result, the investment of using Syrian basalt in preparing concrete mix was very limited.
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100% of coarse recycled aggregate as replacement of natural coarse aggregate in concrete mix are used in this research. The work ability and wet and dry density are presented in this study. The compressive strength at age of 7, 28, 56 days are estimated, also splitting tensile strength and modulus of elasticity are founded at 28 day. The study shows that when The percentage of recycled aggregate exceeds 50% in concrete mix the mechanical properties reduce. When 100% of recycled aggregate is used the compressive strength, splitting tensile strength and elastic modulus decrease by 14%, 22%, 25% respectively, so it is possible to use recycled aggregate concrete in production of non-structural elements.
Compacting hot mixes asphalt (HMA) at low temperatures or mixing it in the asphalt at high temperatures is a constant source of concern to researchers, as compacting and mixing at non-ideal temperatures leads to adverse results, which negatively affect the properties of asphalt concrete and lead to problems paving.
This study presents definition of the types of lightweight concrete and
some studies, which use the volcanic scoria aggregates to produce
structural lightweight concrete.
Several concrete mixes were designed, and different tests were
performed to
determine its properties.
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