Yasser M. Hunaiti

• University of Jordan

Using recycled asphalt pavement (RAP) as a natural aggregate (NA) replacement supports environmental preservation but requires performance evaluation. This study investigated the mechanical properties of concrete containing RAP and the potential of silica fume (SF) and superplasticizer (SP) to enhance these properties. Thirty-five concrete mixtures...

In this research, experimental investigation of concrete containing recycled asphalt pavement (RAP) and Superplasticizer (SP) was conducted to study the effect of RAP replacement and SP on some important factors such as slump, water absorption, and density for different concrete mixes. Twenty concrete mixtures were prepared using crushed RAP as a c...

Using recycled aggregate in concrete is an environmentally friendly solution that preserves the environment and the earth's natural resources. However , the suitability of recycled aggregate for use in structural concrete must be verified. In this research, experimental investigation of concrete containing recycled asphalt pavement (RAP) was conduc...

In this research, experimental investigation of concrete containing recycled asphalt pavement (RAP) and Superplasticizer (SP) was conducted to study the effect of RAP replacement and SP on some important factors such as slump, water absorption, and density for different concrete mixes. Twenty concrete mixtures were prepared using crushed RAP as a c...

This study aims to investigate experimentally and numerically the behavior of light-gauge steel tubes filled with normal and lightweight concrete under axial loading. A total of thirty-five specimens, including thirty-two composite columns, two bare steel columns, and one normal-weight plain concrete column, were considered. The main variables in t...

The axial capacity of light–gauge steel tube columns filled with concrete including recycled asphalt pavement (RAP) aggregates and recycled concrete aggregates (RCA) was investigated. A total of 51 specimens, including 6 bare steel tubes, 30 composite columns and 15 concrete-only columns were tested under uniaxial load. Fifteen concrete mixes were...

This paper presents an experimental and a numerical investigation of light-gauge steel box sections filled with concrete made with a combination of natural aggregate (NA), recycled concrete aggregate (RCA), and recycled asphalt pavement (RAP). A total of 47 specimens, including 30 composite beams, 15 plain concrete beams, and 2 bare steel beams wer...

The objective of this study was to evaluate the bond behaviour of concrete-filled steel tubes (CFSTs) where waste chipped rubber, sourced from scrap tyres, partially replaces natural coarse aggregate. A series of push-out tests on 112 circular and square CFST specimens were investigated with the main parameters considered in the tests being: (a) cr...

The purpose of this paper is to investigate the effect of nonlinear material behavior on four layered, symmetric; angle-ply laminated composite plate with various fiber-orientation angles; (θ = 30°, 45° and 60°). The plate has a central square-hole and subjected to out-of-plane uniformly distributed load. The effect of Stress Concentration Factor (...

Size of hole, aspect ratio of plates and fibre orientation angle are very important parameters in the design of composite laminates. Presence of hole will redistribute in-plane stresses, concentrate the maximum stresses around the hole and affect the stress concentration factor (SCF). Accordingly, the peak values of in-plane stresses are increased...

This study summarizes the results of experimental push-out tests conducted on concrete-filled steel tubes (CFST) incorporating rubberized concrete with the main variables being the recycled rubber replacement ratio, certain sizes of steel tubes having circular and square sections and ages of testing (at 28 days and one year). In addition, 150 mm-cu...

Reinforced concrete beams are commonly retrofitted using Carbon Fiber Reinforced Plastic (CFRP) plates as the technique is both inexpensive and unobtrusive. However, tests have shown that CFRP plates tend to debond at low strains, which can severely limit the ductility. Structural strengthening of beams subjected to flexure can be achieved using di...

In this paper the nature of bond stresses are studied for different regions of reinforced concrete elements subjected to flexure and shear, various literature articles on the subject are reviewed and the seismic effect for bond and development length is discussed.

Structural strengthening of beams subjected to flexure can be done by more than one method, both the CFRP laminates and the Light Gauge Galvanized Steel Plat methods are tested to compare the ductility of members designed using ACI-440 to reach the same strength.

Residual stresses have a significant effect on the stability resistance of metal building systems. An experimental program was conducted to measure these stresses in built-up steel beams using incremental hole-drilling method. The experimental results reveal that the predicted residual stress type of pattern for built-up I-sections with fillet weld...

An experimental investigation was made of the inelastic lateral-torsional buckling of built-up steel I-beams. All beams were carefully fabricated with controlled levels of initial crookedness. Nineteen beams were tested in five groups under same loading conditions with two points load applied at the top flange. The results confirmed that built-up b...

Tests on steel tubular columns of square, rectangular and circular section filled with normal and lightweight aggregate concrete were conducted to investigate the failure modes of such composite columns. Thirty-six full scale columns filled with lightweight and normal weight aggregate concrete, eighteen specimens for each, were tested under axial l...

An experimental investigation of lightweight aggregate and foamed concrete contribution to the ultimate strength capacity of square and rectangular steel tube sections is presented in this study. Thirty-four simply supported beam specimens, 1000-mm long, filled with lightweight aggregate and foamed concretes were tested in pure flexural bending to...

An experimental study was conducted to investigate the behavior of eccentric lightweight aggregate concrete-encased composite columns. This study aims at verifying the validity of such type of concrete in composite construction and checking the adequacy of the AISC-LRFD and the British Bridge Code BS 5400 specifications in predicting the column str...

Tests on hollow steel tubes of square, rectangular and circular sections filled with foamed concrete and lightweight aggregate concrete were conducted to investigate the contribution of these concretes to the strength of cross sections of composite short columns. In addition, these tests aims at understanding the behavior of short columns with ligh...

The ultimate moment capacity of partially encased composite beams had been studied theoretically and experimentally. Tests were carried out on a total number of twelve beams of four different sizes with a constant length of about 2.0 m loaded by two points loading. Three groups, four beams each, were tested to investigate the contribution of differ...

Tests on steel hollow tubes of square and circular sections filled with foamed and lightweight aggregate concrete were conducted to investigate the contribution of these concretes to the strength of cross sections of composite members, Eight short column specimens filled with foamed and lightweight aggregate concrete, four specimens each, were test...

An experimental Study was conducted to investigate the composite action of foamed and lightweight aggregate concrete. Thirty-six push-out tests were performed on concrete-filled steel hollow sections of square and circular shapes. Bond strength between steel and concrete in composite sections depends on several factors. The shape of the cross secti...

Experimental results of previous research showed that the bond strength between structural steel shapes and concrete in composite sections at the age of one year is approximately 30% of that at the, age of three weeks. A literature survey reveals that no research has been conducted to investigate bond strength in composite construction at ages over...

The load-carrying capacity of partially encased composite columns subjected to eccentric load has been studied. Nineteen full-scale columns of partially encased sections were tested in two parallel investigations at the University of Jordan. IPE 200 x 100 x 22 steel sections (German standards) with a buckling length of 2.4 m were encased partially...

This paper presents results from an experimental study of the effect of bond between structural steel and concrete on the maximum carrying capacity of composite columns. Fourteen slender battened composite columns were tested under concentric and eccentric loads in major and minor axis bending. The inside face of the steel channels of seven of thes...

Tests on 135 battened composite specimens are performed to investigate the bond between concrete and steel in battened composite columns. Several factors believed to affect the bond between the two materials are investigated, including age and size of specimen, curing, and temperature. The test results of this investigation show that the battened c...

Written for the Dept. of Civil Engineering and Applied Mechanics. Typescript. Thesis (M.Eng.) -- McGill University. Bibliography: leaves 69-70.