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Properties Of Concrete

Reinforcement corrosion has been widely reported in the literature over the last two to three decades. It is one of the major durability problems, mainly when the rebar in the concrete is exposed to the chlorides either contributed from the concrete ingredients or penetrated from the surrounding chloride-bearing environment. Carbonation of concrete or penetration of acidic gases into the concrete, are the other causes of reinforcement corrosion. Besides these there are few more factors, some related to the concrete quality, such as w/c ratio, cement content, impurities in the concrete ingredients, presence of surface cracks, etc. and others related to the external environment, such as moisture, oxygen, humidity, temperature, bacterial attack, stray currents, etc., which affect reinforcement corrosion. The assessment of the causes and extent of corrosion is carried out using various electrochemical techniques. Prediction of the remaining service life of a corroding RC structure is done with the help of empirical models and experimental methods. In this paper a review is presented on the mechanism of reinforcement corrosion, techniques utilized to monitor reinforcement corrosion and methodologies that are utilized for the prediction of remaining service life of structures.

https://faculty.kfupm.edu.sa/ce/shamsad/abstracts/jp/shamsad_jp06.pdf

Reinforcement corrosion in concrete structures, its monitoring and service life prediction - A review

https://repository.tudelft.nl/islandora/object/uuid%3A1f6e1c6c-7d68-440d-905f-164811f46c8e/datastream/OBJ/download

Carbonation of cement paste : Understanding, challenges, and opportunities

Recent durability studies on concrete structure

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

In this work, an effort has been made to first observe the effect of reinforcement corrosion on flexural behavior of reinforced concrete beams and then to develop a model based on the test data to predict their residual flexural strength. Test data were gathered from the testing of 56 reinforced concrete beam specimens that were subjected to a varying degree of accelerated corrosion. It has been observed that the product of corrosion current density and corrosion period I corr T is the most significant factor affecting the flexural strength of a corroded beam. Based on the experimental data, a two-step approach is proposed to predict the residual flexural strength of a corroded beam. First, the flexural strength is calculated using the reduced area of corroded bars, and then this value is multiplied by a correction factor that is formulated through a regression analysis of test data to take into account bond, slip, and other applicable factors.

/pdf/residual-strength-of-corrosion-damaged-reinforced-concrete-3evgxwgc5s.pdf

Residual strength of corrosion-damaged reinforced concrete beams

In this study, plain, silica fume and fly ash cement concrete specimens prepared with varying water to cementitious materials ratio and cementitious materials content were tested for compressive strength, water permeability, chloride permeability, and coefficient of chloride diffusion after 28 days of water curing. The data so developed were statistically analyzed to develop correlations between the compressive strength and the selected durability indices of concrete. Very good correlations were noted between the compressive strength and the selected durability indices, particularly chloride permeability and coefficient of chloride diffusion, irrespective of the mix design parameters. However, these correlations were observed to be dependent on the type of cement.

Correlation between compressive strength and certain durability indices of plain and blended cement concretes

لا ةعيبط ببسب ةئيطب ةيلمع يه ةناسرخلا يف ديدحلا لآآت نإ ةيئامحلا ةناسرخ . ةليوط ةينمز ةرتف هروطتو حيلستلا ديدح لآآت ةيادب ةيلمع ذخأتو ديدحلا لآآتل ةديدشلا ضرعتلا تلااح يف ىتح . مييقتلاو ثاحبلأا ءارجلإ كلذو ةبعص ةيلمعو ةددحم ةرتف يف ارثؤم حيلستلا ديدح لآآت قيقحت دعيو ثاحبأآ : 1 لمحتلا هردق دقفو كسامتلا دقف هئدصلا ةيناسرخلا رصانعلل . 2 حيلستلا ديدح لآآت ضيفخت يف ةيندعملا تافاضلإا ريثأت . 3 كئابس ءادأ حيلستلا ديدح لآآت ةمواقمل ىطغملا حيلستلا ديدحو حيلستلا ديدح . 4 حيلستلا ديدح لآآت عنمل ةقبطملا ةيئايميآورتكللأا قرطلا ةءافآ ىدم . مدختسي كلذل نيثحابلا نم ريثآ حيلستلا ديدح لآآت عيرستل قرط ةدع .

Shamsad Ahmad

Papers

Reinforcement corrosion in concrete structures, its monitoring and service life prediction - A review

Residual strength of corrosion-damaged reinforced concrete beams

Correlation between compressive strength and certain durability indices of plain and blended cement concretes

Techniques for inducing accelerated corrosion of steel in concrete

Seismic behavior of beam-column joints strengthened with ultra-high performance fiber reinforced concrete