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Application of size effect to compressive strength of concrete members 471 Jenq & Shah (1991) explained size-independent strength differently, based on the fracture behaviorofconcrete:thenominalstrength ˙N wasconsideredthesumofthesize-independent and the size-dependent strengths, namely the former for the uncracked state and the latter for the cracked state, lo .
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First, the fracture mechanics type size effect on the axial compressive strength of unnotched and notched cylindrical concrete specimens were studied, with the diameter, and the height/diameter ratio and initial notch length considered as the main parameters. For this purpose, theoretical, experimental, and statistical analyses were conducted. Size effect equations were proposed to predict the ...
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18.05.2018· Concrete being the major consumable material after water makes it quite inquisitive in its nature. The strength of concrete is majorly derived from aggregates, where-as cement and sand contribute binding and workability along with flowability to concrete.. This is an in-depth article on Compressive Strength of Concrete.
A comparison between the 28-day compressive strength of ambient-cured specimen prepared with alkaline pretreated and untreated OPS shows that OPS pretreated with 5% sodium silicate has negligible effect on the compressive strength; the maximum increase in the compressive strength of about 5.5% was found for the specimen prepared with OPS pretreated with 50% NaOH. Similarly, for the .
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This study aims to investigate the effect of construction waste, WFS along with additives on the stress-strain behavior and development of compressive strength with age. Design/methodology/approach. The various concrete specimen were prepared in mix proportion of 1: 2: 4 (cement (C): sand: coarse aggregate). The water-cement ratio of 0.5 (decreased by 10% for samples containing SP) to grading ...
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strength; though, both provision requirements do not specifically clarify the applicability and/or modification of the correction factors for the compressive strength to lightweight concrete (in this case, foamed concrete). The focus of this work is to study the effect of specimen size and shape on the axial compressive strength of concrete.
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False strength of concrete proves fatal as it may fail due to various factors in the long terms. Therefore, to ensure the functional performance and safety of structure it is necessary to determine the true strength of concrete. In this project the effect of high rate of loading on compressive strength of concrete has been studied. As it has
Wash water in the mix: Effects on the compressive strength of concrete. Beginning with the Water Quality Act of 1987, requirements were put in place to control sediment run off from construction sites, which typically meant silt fences ...
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Abrams''s law of compressive strength versus water/cement ratio is well known and many investigators have studied the possible effects of other factors, such as cement content and sand concentration, upon concrete strength. In particular, the British and American literature is often at variance concerning these secondary effects so that a primary aim of the present paper is to reconcile these ...
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This paper discusses the effects of recycled concrete aggregates (RCA) on compressive strength and permeability of recycled aggregate concrete (RAC) by using recycled concrete aggregates as a replacement of natural coarse aggregates (NCA). Four replacement percentages were used to study the effect of replacement. Replacement percentages used were 30%, 50%, 70% and with 0% .
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Effect of Curing Methods on Compressive Strength Of Concrete 15 2. Review of Related Literatures In concrete technology, the maintenance of the drying and setting process is referred to as curing. The purpose of curing is to keep ad-equate moisture content and temperature as soon as the concrete is placed and nished. It is one of the most important (and over-looked) steps and can have the ...
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Effect of Duration of Water Curing on Strength of Concrete. There is a significant impact of water curing and time of curing in achieving the strength of the concrete. In addition, curing affects the durability of concrete. The effect of moist curing can be expressed as follows. Allowing concrete to dry out immediately achieve only 40% of the ...
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02.11.2018· It can be seen from Figure 6 that the compressive strength of concrete decreased with the increase of CO 2 concentration. Under the same test conditions, the influences of the carbonation effect on concrete strength intensified in response to the decreasing strength grade of concrete.
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compressive strength of concrete mixes is m15 and m20. From the literature review, it is observed that researches have been attempted on various aspects of flakiness of the aggregates. But it is observed that very few literatures are available on the effect of flakiness on the cubes strength using destructive and non-destructive method. In this study attempt would be made to carry . malviya ...
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SIZE EFFECT ON COMPRESSIVE STRENGTH OF CONCRETE J. K. Kim1 and S. T. Yi2 1Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejon,, South Korea. 2Department of Civil Engineering, Chung Cheong University, Cheongwon,, South Korea. ABSTRACT It is important to consider an effect of a member size when estimating .
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The application of nanotechnology in concrete has added a new dimension to the efforts to improve its properties. Nanomaterials, by virtue of their very small particle size can affect the concrete properties by altering the microstructure. This study concerns with the use of nano silica of size 236 nm to improve the compressive strength of concrete.
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compressive strength of concrete mixes is m15 and m20. From the literature review, it is observed that researches have been attempted on various aspects of flakiness of the aggregates. But it is observed that very few literatures are available on the effect of flakiness on the cubes strength using destructive and non-destructive method. In this study attempt would be made to carry . malviya ...
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Compressive Strength of Cylindrical Concrete Specimens. Some cores were tested for permeability in accordance to AASHTO T277, the results are found below in this document. The mix used on this project is a standard 47B mix design (70% sand/gravel and 30% limestone) with compressive strengths of 3500 psi at 28 days. Table 1 shows the concrete
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Effect of Compressive Strength on Bond Behaviour of Steel Reinforcing Bar in Fiber Reinforced Concrete ... concrete. When the compressive strength of the fiber reinforced concrete is increased, the brittleness increases, however, steel fibers reduce the brittleness. The use of fibers (90.0 mm) results in higher average bond strength. The increase was less than the increase in (fc'')1/2 due to ...
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Crossover effect during strength development of concrete due to different curing temperature. 2.1. Relative Strength Development . Under isothermal curing, the compressive strength of concrete at age (in days) is commonly determined from the following hyperbolic function: where is the rate constant (in units of day −1) for strength development at the curing temperature, is the offset time ...
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Application of size effect to compressive strength of concrete members 471 Jenq & Shah (1991) explained size-independent strength differently, based on the fracture behaviorofconcrete:thenominalstrength ˙N wasconsideredthesumofthesize-independent and the size-dependent strengths, namely the former for the uncracked state and the latter for the cracked state, .
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The intensive effect of the concrete strength on the posttensioning design of slabs, especially in the lower ranges of compressive strength, was evident during the numerical analysis. Additionally, the reinforcement ratio shows a minor effect on the deflection of a posttensioned slab.
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The results of compressive strength have been presented in tables 4-9and in the graphical representation of average compressive strength versus curing age for different methods of curing used in the experiment (see fig 3). In all curing methods, the compressive strength of the concrete increases with age. The highest compressive strength at all ages was produced by immersion (water) curing ...
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The compressive strength of various concrete specimen were noticed for 3, 7 and 28 days by applying load through universal testing machine. Findings Upon adding construction and demolition waste aggregates, the compressive strength of concrete after 28 days was comparable to that of the control concrete specimen.
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With regard to compressive strength, 38% of the concrete cubes made from sand with varying sand impurities failed to meet the design strength of 25 Mpa at the age of 28 days. A combined regression equation of with R2 = 0.444 was generated predicting compressive strength varying levels of silt and clay impurities (SCI), and organic impurities (ORG) in sand.
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A comparison between the 28-day compressive strength of ambient-cured specimen prepared with alkaline pretreated and untreated OPS shows that OPS pretreated with 5% sodium silicate has negligible effect on the compressive strength; the maximum increase in the compressive strength of about 5.5% was found for the specimen prepared with OPS pretreated with 50% NaOH. Similarly, for the .
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This study considered the effect of different methods of curing on density and compressive strength of concrete. Concrete cube specimens of mix 1:2:4 were prepared with water-cement ratio of 0.65. The cubes were cured using six methods (air curing, water-submerged curing, spray curing, polythene curing, moist sand curing and burlap curing) until testing ages of 3, 7, 14, 21 and 28 days when ...
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Application of size effect to compressive strength of concrete members 471 Jenq & Shah (1991) explained size-independent strength differently, based on the fracture behaviorofconcrete:thenominalstrength ˙N wasconsideredthesumofthesize-independent and the size-dependent strengths, namely the former for the uncracked state and the latter for the cracked state, .
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Crossover effect during strength development of concrete due to different curing temperature. 2.1. Relative Strength Development . Under isothermal curing, the compressive strength of concrete at age (in days) is commonly determined from the following hyperbolic function: where is the rate constant (in units of day −1) for strength development at the curing temperature, is the offset time ...
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A Study of Effect of Accelerators on Compressive and Flexural Strength of Concrete Gaurav Awasthi Dr. U. B. Choubey PG Student Professor Department of Structural Engineering Department of Civil & Applied Mechanics Engineering SGSITS, Indore SGSITS, Indore Abstract This paper presents an experimental study conducted on 240 specimens, 120 cubes and 120 beams to see the effect of .
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Effect of Hand Mixing on the Compressive Strength of Concrete . James Isiwu AGUWA . Department of Civil Engineering, Federal University of Technology, Minna, Nigeria. E-mail: [email protected] . Received: 13 November 2010 / Accepted: 10 December 2010 / Published: 24 December 2010 . Abstract. This paper presents the effect of hand mixing on the compressive strength of concrete. Before .
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The compressive behaviors of concrete in different humidity states are compared, and the microstructure is studied in detail using scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP). The results indicate that drying results in an increase of compressive strength, whereas rewetting results in a significant decrease. Both drying and rewetting humidity-controlling .
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