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Textbook Of Work Physiology Physiological Bases Of Exercise

Use of recycled plastics in concrete: A critical review.

In recent years, an emerging technology termed, “High-Performance Fiber-Reinforced Concrete (HPFRC)” has become popular in the construction industry. The materials used in HPFRC depend on the desired characteristics and the availability of suitable local economic alternative materials. Concrete is a common building material, generally weak in tension, often ridden with cracks due to plastic and drying shrinkage. The introduction of short discrete fibers into the concrete can be used to counteract and prevent the propagation of cracks. Despite an increase in interest to use HPFRC in concrete structures, some doubts still remain regarding the effect of fibers on the properties of concrete. This paper presents the most comprehensive review to date on the mechanical, physical, and durability-related features of concrete. Specifically, this literature review aims to provide a comprehensive review of the mechanism of crack formation and propagation, compressive strength, modulus of elasticity, stress–strain behavior, tensile strength (TS), flexural strength, drying shrinkage, creep, electrical resistance, and chloride migration resistance of HPFRC. In general, the addition of fibers in high-performance concrete has been proven to improve the mechanical properties of concrete, particularly the TS, flexural strength, and ductility performance. Furthermore, incorporation of fibers in concrete results in reductions in the shrinkage and creep deformations of concrete. However, it has been shown that fibers may also have negative effects on some properties of concrete, such as the workability, which get reduced with the addition of steel fibers. The addition of fibers, particularly steel fibers, due to their conductivity leads to a significant reduction in the electrical resistivity of the concrete, and it also results in some reduction in the chloride penetration resistance of the concrete.

High-performance fiber-reinforced concrete: a review

Use of macro plastic fibres in concrete: A review

https://www.fernandofraternaliresearch.com/publications/FF_COST_RPETFRC_2011.pdf

Experimental study of the thermo-mechanical properties of recycled PET fiber-reinforced concrete

This paper investigates the mechanical properties of polypropylene hybrid fiber-reinforced concrete. There are two forms of polypropylene fibers including coarse monofilament, and staple fibers. The content of the former is at 3 kg/m3, 6 kg/m3, and 9 kg/m3, and the content of the latter is at 0.6 kg/m3. The experimental results show that the compressive strength, splitting tensile strength, and flexural properties of the polypropylene hybrid fiber-reinforced concrete are better than the properties of single fiber-reinforced concrete. These two forms of fibers work complementarily. The staple fibers have good fineness and dispersion so they can restrain the cracks in primary stage. The monofilament fibers have high elastic modulus and stiffness. When the monofilament fiber content is high enough, it is similar to the function of steel fiber. Therefore, they can take more stress during destruction. In addition, hybrid fibers disperse throughout concrete, and they are bond with mixture well, so the polypropylene hybrid fiber-reinforced concrete can effectively decrease drying shrinkage strain.

http://www.ce.nchu.edu.tw/Pic/Writings/1364_出版MSA24166.pdf

Mechanical properties of polypropylene hybrid fiber-reinforced concrete

Resource-constrained scheduling for continuous repetitive projects with time-based production units

http://ir.lib.cyut.edu.tw:8080/bitstream/310901800/6537/1/2.pdf

A model used in creating a work-rest schedule for laborers

Most construction projects involve earthmoving operations. Careful management of trucks to perform these operations is considered crucial by earthwork contractors in Taiwan. A mechanism is described that optimizes the management of the truck fleets of earthwork contractors. The proposed model integrates a discrete event simulation technique and genetic algorithms (GAs) to minimize the duration of earthmoving operations. The discrete simulation model is applied to simulate earthmoving operations and generate schedules for dispatching various trucks, and the GAs are used as a filter to screen out schedules that require long trips. Examples prove that the proposed model can determine near-optimal solutions efficiently. In addition, a user-friendly computer program is developed so that earthwork contractors can plan the dispatch schedule of earthmoving trucks easily and effectively.

Optimizing the Schedule of Dispatching Earthmoving Trucks through Genetic Algorithms and Simulation

The Artificial Neural Network (ANN) and the nonlinear regression method are commonly used to build models from experimental data However, the ANN has been criticized for incapable of providing clear relationships and physical meanings, and is usually regarded as a black box The nonlinear regression method needs predefined and correct formula structures to process parameter search in terms of the minimal sum of square errors Unfortunately, the formula structures of these models are often unclear and cannot be defined in advance To overcome these challenges, this study proposes a novel approach, called ''LMGOT,'' that integrates two optimization techniques: the Levenberg-Marquardt (LM) Method and the genetic operation tree (GOT) The GOT borrows the concept from the genetic algorithm, a famous algorithm for solving discrete optimization problems, to generate operation trees (OTs), which represent the structures of the formulas Meanwhile, the LM takes advantage of its merit for solving nonlinear continuous optimization problems, and determines the coefficients in the GOTs that best fit the experimental data This paper uses the LMGOT to investigate the data sets of pavement cracks from a 15-year experiment conducted by the Texas Departments of Transportation Results show a concise formula for predicting the length of pavement transverse cracking, and indicate that the LMGOT is an efficient approach to building an accurate crack model

Machine Hsie

Papers

Mechanical properties of polypropylene hybrid fiber-reinforced concrete

Resource-constrained scheduling for continuous repetitive projects with time-based production units

A model used in creating a work-rest schedule for laborers

Optimizing the Schedule of Dispatching Earthmoving Trucks through Genetic Algorithms and Simulation

Modeling asphalt pavement overlay transverse cracks using the genetic operation tree and Levenberg-Marquardt Method