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Mechanical Properties and Dynamic Response of Lightweight Reinforced Concrete Beam | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 30, Issue 2, 2012, Pages 293-311 PDF (659.04 K) | ||
| DOI: 10.30684/etj.30.2.9 | ||
| Authors | ||
| Aziz Ibrahim Abdulla; Alyaa A. Ali; Ahmed Adnan Ghanee | ||
| Abstract | ||
| The study is conducted to perform two goals: The first geal is to produce a lightweight concrete using major components which are locally available with some standard admixtures.Many mixtures are prepared using many ratios of superplasticizer (SP) and silica fume (SF) admixtures to yield a lightweight aggregate concrete, the effects of using different ratios of these admixtures on unit weight, compressive strength and flexural strength are studied individually and accumulatively. The secondis to study the dynamic specifications of normal and lightweight reinforced concrete beams. The results showed that the increasing in dosage of superplasticizer (SP) for (LWAC) increases the density of (LWAC), and the increasing in dosage of silica fume (SF) decreases the density of (LWAC). The experimental impact tests for R.C. beams shows that the lightweight R.C. beams have a better response under impact loading with respect to the maximum dynamic deflection (2.955mm for normal weight beam and 1.58mm for lightweight beam). Also,Impact force transferred to supports reactions of lightweight beams is smaller within 45% than the impact force transferred to reaction of normal weight concrete under the same impact load, and the time to reach 90% damping equal to 1.223 sec and 1.6 sec for lightweight and normalweight R.C. beams respectively. Also, the reinforced concrete beams are tested under repeated impact load up to failure. The tests showed that the no. of blows to cause first crack for lightweight concrete beams more than twice of this for normalweight concrete beams. | ||
| Keywords | ||
| reinforced concrete; dynamic; impact; Mechanical properties | ||
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