This study aims to develop the micro-analysis of the bituminous mixtures using 2D scanner and Image Analysis Techniques (IAT). A new methodology and scheme are developed for faster and accurate procedure to compute Gradation of aggregates using (IAT) instead of the conventional methods. 2D scanner is used to analyze the horizontal cross section of HMA slices. This dissertation focuses on introducing a more elaborate method for characterization of the internal structure of aggregates which characterization of internal structure is necessary to understand the behavior of the bituminous mixtures under different conditions. Image Analysis Techniques (IAT) the technological advantages to better understand construction materials and it also provides information that can help to improve the properties of various construction materials. The aggregate internal structure provides the skeleton of the asphalt mixture, which plays an important role in rutting resistance. The Results helped to analyze the internal structure thus improving the ability to understand the behavior of construction materials. Also, the results indicate potential for using this method to evaluate the internal structure of mixtures in field where using this non-destructive, cost effective and a time efficient approach.

Usage of precast prestressed concrete hollow core (PPHC) slabs has been extensively spread out in roofing and flooring systems around the globe due to benefits of mass production and fast site construction. In this flooring system, prestressed precast hollow core slabs are used together with or without a cast in place concrete topping. A few research works focused on studying the effect of using concrete topping on enhancement of the structural integrity of the PPHC system. This paper presents an experimental study conducted to investigate the effects of using different types of cast in place (CIP) concrete toppings on the behavior of PPHC slabs. Ten typical full scale specimens of PPHC slabs were prepared in precast concrete plant under quality control program; specimens were classified into five groups. Group (1) includes two control specimens without topping, Group (2) contains two specimens with ordinary reinforced concrete topping, Group (3) involves two specimens with ordinary reinforced concrete topping connected to the top surface of the slab using steel anchors, Group (4) comprises two specimens with fibrous concrete topping, and finally Group (5) includes two specimens with ferrocement topping. All test specimens were tested under static line loading until failure. Cracking patterns, failure modes, cracking and ultimate failure moment capacities, and moment-deflection relationship have been illustrated, discussed, and analyzed in this study. Adding concrete topping to the PPHC slabs enhances flexural behavior directly under static line loading, as the cracking moment resistance was increased by about 6% to 31% and failure moment was increased by about 11% to 41% by using concrete toppings.

This paper presents an experimental investigation on the behavior of reinforced concrete beams subjected to combined bending and torsion, strengthened by using externally bonded glass fiber reinforced polymer (GFRP). The experimental work includes investigation of three RC beams tested under combined bending and torsion. One beam is kept without strengthening as a control specimen, while the other two beams are strengthened using GFRP wrapping with different configurations. All RC beams have the same concrete grade and steel reinforcement. The strengthened beams in the experimental study include full wrapping with continuous GFRP sheets and discrete GFRP strips with the same GFRP reinforcement ratio. The load-mid span deflection curves and the torsional moment-twist angle curves were recorded to failure. The crack patterns and failure modes of the RC beams were also indicated. The Experimental results reveal that strengthening by using GFRP wrapping helped effectively in improving the overall performance of the strengthened beams.

In this study, the behavior of the recycled plastic, glass and rubber tire as partial replacement of coarse aggregate in concrete have been investigated. Polyethylene terephthalate (PET) bottles, one of the waste plastic types, broken glass of bottles and rubber tires are used for these purposes. The reason to choose these to transfer the recycles materials into valuable product and to solve the problem of dumping the tons of plastic waste, broken glass and rickshaw tires. In this study compressive strength of cylinder concrete specimens were carried out at 7 and 28 days curing. Six concrete mixes have been studied, those are-reference specimens with no recycled material (CS0), specimens with 15% plastic (CSP15), specimens with 15% (CSR15) and 30% (CSR30) tire, specimens with 15% (CSG15) and 30% (CSG30) glass. Total 24 cylindrical specimen of 8"x4" were tested for compressive strength. The order of compressive strength was CS0 > CSG30 > CSG15 > CSR15 > CSR30 > CSP15. The Study found that compressive strength of concrete mix decreases with the increase of plastic and rubber content. However, compressive strength of concrete increases with the increase of glass content. Plastic material have low bonding with cement in concrete and perform poorly. On contrary, glass works very well with concrete and compressive strength of concrete reduces with the increase of rubber content.