The behavior of concrete reinforced by higher proportion of date palm fibers

Over the recent decades, scientists have begun to search for more sustainable and environmentally friendly materials. It is well known that construction materials are among the most commonly used materials, and have a clear negative impact on the environment. Therefore, this paper aims to discuss the possibility of using waste from date palm trees in concrete as a natural alternative to the conventional fibers. Previous studies concentrated on examining the behavior of lower dosages or short length of male date palm surfaces fibers (MDPSF) in concrete. In this study, MDPSF concrete specimens made by using higher dosages and longer length of fiber were tested. The mechanical properties of the date palm tree fiber have been investigated. In addition, flexural and compressive behavior of concrete specimens reinforced with different ratios and length of palm tree fiber, were studied. The results show clear improvement in flexural strength when MDPSF was added. Furthermore, by adding MDPSF the ductility of beam specimens was increased. An increase in compressive strength was achieved by adding MDPSF

Design Model of Rectangular Concrete-Filled Steel Tubular Stub Columns under Axial Compression

This research collected and summarized a total of 455 experimental tests of axially loaded square and rectangular concrete-filled steel tubular (CFST) stub columns. The recently published papers were used to evaluate the current design equations from four international standards, namely the American Concrete Institute (ACI) code, British Standard (BS5400), Chinese standard (BDJ13-51), and Eurocode 4 (EC4). It was found that the results obtained from the codes have appreciable differences and could be improved, especially for the specimens fabricated using high-resistance materials. Therefore, new empirical equations were proposed based on the four standard formulas and the wide range of previously available experimental data to provide more accurate estimations. The proposed equations could predict an average sectional capacity of only 0.1% lower than the experimental results, with better data scattering than the existing equation’s results

Evaluate the Current Expressions of Compression Strength and UPV Relationship

The ultrasonic pulse velocity method UPV has been commonly implemented to examine the mechanical properties and reliability of concrete structures. The principle of UPV is the speed of propagation of waves that depends on the density and the modulus of elasticity of the concrete. UPV is a simple and easier method of non-destructive testing (NDT) for evaluating the structures and material.   The results can be rapidly achieved and data can be periodically collected from the same test points.[1] This paper aimed to evaluate the current mathematical relationships between the compressive strength and (UPV) for concrete samples. The current formulae assimilate limited numbers of experimental tests. This is because of the formula produced of these data is limited to the specimens were tested only. In this study, 575 different experimental tests between 3 and 180 days for compressive strengths ranging from about 20 to 100 MPa were collected and summarized. Moreover, the current equations have been developed to give an accurate correlation between Compressive strength and UPV. In addition, a contemporary design formula was presente

Evaluate the expressions of compression strength and UPV relationship

Ultrasonic pulse velocity method UPV has been commonly implemented to examine the mechanical properties and reliability of concrete structures. The principle of UPV is the speed of propagation of waves that depends on the density and the modulus of elasticity of the concrete. UPV is a simple and easier method of non-destructive testing (NDT) for evaluating the structures and material. The results can be rapidly achieved and data can be periodically collected from the same test points. This paper aims to find a general formula will apply for all types of concrete, wide range of ages and compressive strength. The current formulae assimilate limited numbers of experimental tests. This is because of the formula produced of these data is limited to the specimens were tested only. In this study, 575 different experimental tests between 3 and 180 days for compressive strengths ranging from about 20 to 100 MPa were collected and summarized. Moreover, the current equations have been developed to give an accurate correlation between Compressive strength and UPV. In addition, a contemporary design formula was presented

Evaluate the Current Expressions of Compression Strength and UPV Relationship

The ultrasonic pulse velocity method UPV has been commonly implemented to examine the mechanical properties and reliability of concrete structures. The principle of UPV is the speed of propagation of waves that depends on the density and the modulus of elasticity of the concrete. UPV is a simple and easier method of non-destructive testing (NDT) for evaluating the structures and material.   The results can be rapidly achieved and data can be periodically collected from the same test points.[1] This paper aimed to evaluate the current mathematical relationships between the compressive strength and (UPV) for concrete samples. The current formulae assimilate limited numbers of experimental tests. This is because of the formula produced of these data is limited to the specimens were tested only. In this study, 575 different experimental tests between 3 and 180 days for compressive strengths ranging from about 20 to 100 MPa were collected and summarized. Moreover, the current equations have been developed to give an accurate correlation between Compressive strength and UPV. In addition, a contemporary design formula was presente

Evaluate the Current Expressions of Compression Strength and UPV Relationship

The ultrasonic pulse velocity method UPV has been commonly implemented to examine the mechanical properties and reliability of concrete structures. The principle of UPV is the speed of propagation of waves that depends on the density and the modulus of elasticity of the concrete. UPV is a simple and easier method of non-destructive testing (NDT) for evaluating the structures and material.   The results can be rapidly achieved and data can be periodically collected from the same test points.[1] This paper aimed to evaluate the current mathematical relationships between the compressive strength and (UPV) for concrete samples. The current formulae assimilate limited numbers of experimental tests. This is because of the formula produced of these data is limited to the specimens were tested only. In this study, 575 different experimental tests between 3 and 180 days for compressive strengths ranging from about 20 to 100 MPa were collected and summarized. Moreover, the current equations have been developed to give an accurate correlation between Compressive strength and UPV. In addition, a contemporary design formula was presente