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Study on Structural Behaviour of Normal Concrete and Scc Subjected To Elevated Temperature

Study on Structural Behaviour of Normal Concrete and Scc Subjected To Elevated Temperature

Cement concrete is a complex mixture of different materials, for which the properties may alter in different environmental conditions. The behaviour of concrete in fire depends on its mix proportions and constituents. The principle effects observed in the concrete due to elevated temperatures are loss in compressive strength, loss in weight (or) mass, change in colour and spalling of concrete. Due to these changes there is a great need of study in this region. The objective of this limited study was to provide an overview of the effects of elevated temperature on the behaviour of concrete. In meeting this objective, the effects of elevated temperature on the properties of normal concrete and self compacting concrete materials are summarized. The compressive strength was determined at different temperatures, thus providing scope of determining loss/gain in strength. In addition, modes of cooling, variation in different grades of concrete were studied. As the fire affected concrete cannot undergo destructive in practical situations, Non- destructive testing (NDT) methods, i.e., Rebound hammer test were also adopted and the results were co-related.
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Behavior of Ultra High Performance Concrete (UHPC) and Normal Concrete (NC) Columns Under Eccentric Loads

Behavior of Ultra High Performance Concrete (UHPC) and Normal Concrete (NC) Columns Under Eccentric Loads

The UHPC column was designed to carry the same load of the NC column with the same value of longitudinal reinforcement but normal concrete had a higher compressive strength than which was calculated. However, UHPC column had a half cross section of NC column with the same reinforcement. Load capacity of UHPC1 was satisfied about 85% of the NC1 capacity load. The difference between experimental capacity load and calculated load was considered as a factor of safety. The factor of safety of COMC1 column was 94% of the calculated load but the factors of safety of UHPC1 and NC1 were 63 % and 69% of calculated load respectively. Stiffness of column NC1 was higher than stiffness of COMC1 because NC1 failed much earlier than COMC1.
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A Study on Concrete Filled Steel Tubular Column Steel Beam Connection using Light Weight Concrete and Normal Concrete

A Study on Concrete Filled Steel Tubular Column Steel Beam Connection using Light Weight Concrete and Normal Concrete

concrete filled steel tubular (CFST)column external diaphragm connection with comparision of light weight concrete and normal concrete. For high rise structure CFSTs is an effective construction system in composite structure. In concrete filled tubular structure conncetions is a key issue. To promote the use of CFST structure this study focosses on CFST column to steel beam connection. In this study two specimens were studied under satic loading with external diaphragm connection using light weight concrete and normal concrete. This connection is designed using AIJ code in ANSYS software. The results shows an panel zone effect of diaphragm connection with light weight concrete and normal concrete.
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INFLUENCE OF STEEL FIBERS AS ADMIX IN NORMAL CONCRETE MIX

INFLUENCE OF STEEL FIBERS AS ADMIX IN NORMAL CONCRETE MIX

In recent days the usage of concrete has been increased all over the world. Hence it is important to study the mechanical properties of concrete on addition of mineral admixtures. Our main motive is to know the compression behavior of concrete when different types of mineral admixtures added to the concrete. The mineral admixture we are using in this study are steel fibres. In this study we are casting 6 cubes and 6 cylinders out of which 2 each for 7, 14, 28 days. The percentage addition by weight of concrete for mineral admixtures used are 2% and 4%. We are going to compare the results of compression strength and split tensile strength of concrete with normal concrete when admixtures are added to the concrete with different percentages. The experimental study on normal strength concrete grade for 2% and 4% cube were also prepared respectively.
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Effect of using constructional waste on strength properties of normal concrete

Effect of using constructional waste on strength properties of normal concrete

The main solid waste production in the world is the.construction.and.demolition waste constituents. Thispaper discuss the effect of replacement of waste Red.Clay.Brick.Powder (RCBP) on the mechanical properties of concrete (C25) at both conditions; fresh and hardened concrete through using of different partial replacement of powdered brick with cement until 50 percent by weight (0% , 5% , 10% , 15% , 20% , 25% and 50% ) andreplacing10% of microsilica fume (MSF) by weight replacement of cement to produce concrete and to reduce theimpact.on.environment.by.consuming the material generally considered as waste product. Crushed red clay brick and sieved through 75µm sieve size to achieve fineness as in cement. Cubes of size 150mm, Cylinders of size 300mm x 150mm and prisms of size 100mm x 100mm x 500mm were casted and tested.Workability (slump flow), compressive strength and splitting tensile strength for 7, 14 and 28 days; and the modulus of rupture and the modulus of elasticity for 28 days, were investigation. The results were compared with the referencespecimen that casted with normal concrete only.The addition was the use of waste as an alternative to cement and up to 20% with a slight decrease in the properties of concrete compared with ordinary concrete.
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Comparative Study On Compressive Strength Behaviour Of Normal Concrete And Self Compacting Concrete Exposed To Elevated Temperature

Comparative Study On Compressive Strength Behaviour Of Normal Concrete And Self Compacting Concrete Exposed To Elevated Temperature

to the cementitious materials, their conduct in direct strain at high temperatures is as yet a test and the test outcomes accessible in the written works are inadequate to be sure. Due to elevated temperatures, the effects in concrete are 1) spalling of concrete 2) loss of compressive strength 3) loss of weight/mass 4) change in color 1.1.1 Effects 1) There is a lessening found in the compressive strength of solid when the temperatures are raised. This is a result of the diminishment of strength in total, dissipation of dampness in the 9 solid network. The total/cement proportion has likewise an impact, with the diminishment being relatively littler for lean blends than for rich blends. Cement's compressive strength differs with temperature as well as with various different elements, including the rate of warming, the term of warming, regardless of whether the example was stacked or not, the sort and size of total, the rate of cement paste, and the water/cement proportion. By and large, concrete warmed by a building fire dependably loses some compressive strength and keeps on losing it on cooling. Be that as it may, where the temperature has not surpassed 300ºC, most strength in the end is recuperated. 2) The modulus of elasticity is influenced in the same way by the factors mentioned previously for the compressive strength. The reduction as a function of temperature is bigger than the compressive strength because the peak stress-strain increases with the temperature. 3) In fact the tensile strength of the concrete has a tendency to decrease faster with the temperature than the compressive strength. 4) On heating, a change in colour from normal to a pink/red is often observed and this is useful since it coincides with the onset of significant loss of concrete strength. The full development of the pink/red colour is coincident with substantial reduction in compressive strength and the method may be used to define the distance from
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Comparative Study on Quality of Bacterial Concrete with Normal Concrete

Comparative Study on Quality of Bacterial Concrete with Normal Concrete

Abstract — In recent years, there is increasing interest in the phenomenon of mechanical property recovery in concrete construction using self-healing concrete. The study was motivated by the need to find a solution for the problem of cracking approaching the concept of self- healing concrete. The study was carried out on a bacteria based self-healing concrete using Bacillus Subtilis bacteria .An investigation on the strength assessment of the bacteria-based self-healing concrete by finding out the optimum amount of bacterial content to be added to obtain maximum strength. Bacterially induced calcium carbonate precipitation has been proposed as an alternative and environmental friendly crack repair technique. It is found that microbial mineral precipitation as a result from metabolic activities of favorable bacteria in concrete improved the overall behavior of concrete. It is expected that further development of this techniques will result in a more durable, sustainable and crack free concrete that can be used effectively for constructions in wet atmospheres where corrosion of reinforcement affects the durability, permeability and strength of concrete. Therefore, it is decided to carry out an investigation of determining optimum dosages of bacterial solution required for concrete by forming various concrete cube and Cylinder samples having variations of bacterial solution 20 ml, 30 ml,40 ml and 50 ml. Further these various samples are tested under various laboratory methods. Slump cone test, compressive strength testing, ultrasonic pulse velocity test, and scanning electron microscopes thereby an optimum dosage required is computed. Bacterial concrete is found to be superior as compare to that of conventional concrete in all the aspects of durability. Among the different specimen incorporated it shows that bacterial concrete containing 40ml solution is the optimum dosage required, after which the strength found to be stable or decreased.
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Comparative study on compressive strength of normal concrete and coconut 
		shell concrete using steel fibre

Comparative study on compressive strength of normal concrete and coconut shell concrete using steel fibre

Concrete is one of the important activities in construction industry. The Plain cement concrete is the combination of Ordinary Portland cement, Fine aggregate, Coarse aggregate, water. In this coarse aggregate increases the self weight of the concrete to maximum extent while compare to other components in concrete. Now days the cost of the construction materials is more due to maximum demand in the usage of available resources and it results in scarcity of materials. So the study is mainly towards the alternative material for coarse aggregate and also to reduce its self weight. The Light weight concrete is preferred by the construction industry to eliminate the unwanted dead load in the building.
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Comparison between Strength and Durability of Glass Fiber Reinforced Self Compacting Concrete with Normal Concrete

Comparison between Strength and Durability of Glass Fiber Reinforced Self Compacting Concrete with Normal Concrete

Most admixture manufactures have a range of super plasticizing admixtures tailored to specific user requirements. The admixtures should bring the required water reduction and fluidity at the same time should also maintain its dispersing effect during the time required for transport and application. The required consistence retention will depend on the application. The super plasticizer produces a homogeneous and cohesive concrete generally without any segregation and bleeding. In this study CONPLAST SP 430 with the following properties has been used.

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Comparison Of Mechanical Properties Of Steel Fiber-Reinforced Concrete And Normal Concrete

Comparison Of Mechanical Properties Of Steel Fiber-Reinforced Concrete And Normal Concrete

Steel fiber is used to improve the mechanical properties of concrete, especially the post cracking tensile resistant. Moreover, it has recently been used as an alternative engineering material instead of steel bars/steel stirrups in short-span concrete slabs. Steel fibers reinforced concrete (SFRC) construction is more economical than conventional construction. In addition to cost reduction, SFRC has other beneficial properties such as higher stiffness, higher ductility, lightweight, low repair costs, and better post-cracking and dynamic behavior. SFRC has been used extensively in construction of industrial floors, bridge deck overlays, airport runways, highway pavements, tunnel linings, spillways, dams, slope stabilizations, and many precast products. An example of recent use of steel fiber is the Gotthard Base Tunnel. Nevertheless, relatively little use of SFRC in the building structure is mainly due to the lack of design provisions in building codes. Steel fibers can improve the characteristics of hardened concrete, and polypropylene fibers can have significant effects on the fresh concrete. Polypropylene fibers significantly reduce the slump of the fresh concrete resulting in an increase in the adhesion and cohesion of the concrete. Polypropylene fibers also reduce the plastic shrinkage cracks. Polypropylene fibers can increase concrete durability against fire, freezing, and chemical attacks. Due to its benefits, polypropylene fiber reinforced concrete (PPFRC) is used in pile foundations, piers, highways, industrial floors, bridge decking and others.
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The Angular Flux of Gamma Rays in a Normal Concrete Shield  EUR 5286

The Angular Flux of Gamma Rays in a Normal Concrete Shield EUR 5286

90.— The angular dependence of the photon energy and dose rate flux in an ordinary concrete slab shield is fitted near the shield axis by a power of the directional cosine ω = cos φ.. Th[r]

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ASSESSMENT OF CHARACTERISTICS OF VARIOUS SELF- COMPACTING CONCRETE AND NORMAL CONCRETE AT GREEN AND HARDENED STATE

ASSESSMENT OF CHARACTERISTICS OF VARIOUS SELF- COMPACTING CONCRETE AND NORMAL CONCRETE AT GREEN AND HARDENED STATE

In powder type self-compacting concrete, three mixes with binder content 550 kg/m 3 ,600 kg/m 3 650 kg/m 3 (designated as Mix 1, Mix 2, Mix 3) are casted. Fly ash is used in amount of 40 % of binding material. The quantity of binder content in VMA Mix and NVC Mix is kept 400 kg/m 3 (designated as Mix 4 and Mix 5). Natural river sand is use as fine aggregates. It is confirming to zone II as per IS 383 specifications. Basalt crushed stone coarse aggregates of 20 mm and 10 mm nominal sizes are used. The properties of these are as given in Table-1. Cement used is OPC 53 Grade confirming to IS 12269 - 1987. The properties of cement are as given in Table-2.Fly ash confirming to Class F, which is locally available is used. Polycarboxylic Ether based super plasticiser is used as high range water reducing admixture. Unlike normal vibrated concrete, less data is available on mix design of SCC. Few guidelines for mix design of self-compacting concrete like EFNARC [10] are available, along with mix design used in various researches [11]-[13].After conducting preliminary trials, appropriate changes are made in mix design. The mix proportion adopted for study is given in Table-3. Water/binder ratio is kept constant for all mixes.
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Creep and Shrinkage in normal and Heavy Density concrete

Creep and Shrinkage in normal and Heavy Density concrete

iii).HSC exhibits relatively higher initial rate of shrinkage [7,8]. After drying for 180 days, there is little difference between the shrinkage of HSC and NSC made with dolomite or limestone aggregates. Reducing the curing period from 28 to 7 days causes a slight increase in the shrinkage [7]. Shrinkage of HSC may be expected to differ from NSC in three broad areas as: Plastic shrinkage occurs during the first few days after fresh concrete is placed. During this period moisture may evaporate faster from the concrete surface than it is replaced by bleed water from layers of the concrete mass. Paste of rich mixes such as high strength/performance concrete, will be more susceptible to plastic shrinkage than normal concrete.
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Development of Ultra High Performance Concrete by Normal Curing Method

Development of Ultra High Performance Concrete by Normal Curing Method

ABSTRACT: Ultra High Performance Concrete (UHPC) is a cementitious composite material with optimized gradation of micro and nano particle having water cement ratio less than 0.25 [4]. UHPC has high compressive strength, high ductility and more durable character than normal concrete [1].The a flexural strength and compressive strength of UHPC have 2 to 6 times and 2 to 3 times greater than High Performance Concrete (HPC) respectively [6]. Economical applications such as thinner sections in various construction fields which are achieved with UHPC that is helpful for resisting heavier loads and supporting wider areas. UHPC can be used economically in construction as it needs only a thin section and can support wider areas. With the implementation of UHPC, severe problems such as head room requirements, column free area etc can be achieved [5]. The use of UHPC has been widely spread across countries such as USA, United Kingdom and Sweden In this work different mixes of UHPC are studied and an attempt is made to develop a M 150 mix by normal curing method.
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Effects of GFF Bands on Normal and High Strength Concrete Cylinders

Effects of GFF Bands on Normal and High Strength Concrete Cylinders

Table 1 shows the axial strain value at peak load for unconfined and GFF confined normal and high strength concrete cylinders. The observed axial peak strain in unconfined normal strength concrete cylinder N1 was similar to the unconfined high strength concrete cylinder H1, whereas the ultimate compressive strength was not the same. It can be seen that the GFF confined normal strength concrete cylinders attained more ductility over the GFF confined high strength concrete cylinders. The strain values of the GFF confined high strength concrete cylinders were relatively less when compared to the GFF confined normal strength concrete cylinders. From Fig. 4 it can be seen that the stiffness of the GFF confined high strength concrete cylinders was higher than GFF confined normal concrete cylinders. Results confirm that the grade of concrete could affect the performance of GFF confined concrete cylinders with respect to their test variables.
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A Study on Normal Compacting Concrete by Using Rubber Fibers

A Study on Normal Compacting Concrete by Using Rubber Fibers

 The rubber fiber is very less cost with compare to aggregate and it will be found at various retreading and tyres manufacturing companies, we use disposed waste rubber for the casting of cubes, cylinders and prisms in the laboratory. Advantage in this paper is economical but strength is less than permissible of normal concrete and it is useful for the medium grades of concrete.  Fiber reinforced concrete is light weight, resistance from

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Time dependent deformations in normal and heavy density concrete

Time dependent deformations in normal and heavy density concrete

Time dependent deformations in concrete, both creep and shrinkage, play a critical role in prestressed concrete structures, such as bridge girders, nuclear containment vessels, etc. These strains result in lossess, through release of prestress, and thereby influence the safety of these structures. The present study comprises of an experimental and analytical program to assess the levels of creep and shrinkage in normal and heavy density concrete. The experimental program includes tests on creep using standard cylinder specimen, while shrinkage studies have been conducted using prism specimen, both under controlled environmental conditions. The experimental results suggest that creep and shrinkage strains are higher in heavy density concrete than in normal concrete. This may be attributed to the relatively smaller pore structure of heavy density concrete that results in larger availability of free water and a relatively slower hydration process in comparison to normal concrete. While there is some scatter in the results, creep strains decrease with age of loading and both creep and shrinkage strains are smaller when the relative humidity is higher. Statistical model reported in the literature for normal concrete is able to predict the test results for both normal and heavy density concrete quite well. Long term predictions of creep and shrinkage using this model, accounting for uncertainties, is also projected and shown to predict some long term measured results not used in the model calibration. The long term predictions are sensitive to the initial data used in model calibration.
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Experimental Study on Development of Normal Strength Concrete and High Strength Concrete Using Alccofine

Experimental Study on Development of Normal Strength Concrete and High Strength Concrete Using Alccofine

strength in concrete. The experimental work is carried out to evaluate mechanical properties such as compressive strength, split tensile strength and flexural strength for normal strength concrete and high strength concrete. Normal concrete and High strength concrete is made by replacing alccofine by weight of cement various percentage 0% ,9%, 10% , 11% ,12% ,13%, 14%.using constant water cement ratio 0.45and 0.30 for M30 and M70 concrete respectively, super plasticizer are used for required degree of workability. Casting specimen is cured in atmospheric temperature and hardened properties for 7, 14 and 28days
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Effects of GFF bands on normal and high strength concrete cylinders

Effects of GFF bands on normal and high strength concrete cylinders

Table 1 shows the axial strain value at peak load for unconfined and GFF confined normal and high strength concrete cylinders. The observed axial peak strain in unconfined normal strength concrete cylinder N1 was similar to the unconfined high strength concrete cylinder H1, whereas the ultimate compressive strength was not the same. It can be seen that the GFF confined normal strength concrete cylinders attained more ductility over the GFF confined high strength concrete cylinders. The strain values of the GFF confined high strength concrete cylinders were relatively less when compared to the GFF confined normal strength concrete cylinders. From Fig. 4 it can be seen that the stiffness of the GFF confined high strength concrete cylinders was higher than GFF confined normal concrete cylinders. Results confirm that the grade of concrete could affect the performance of GFF confined concrete cylinders with respect to their test variables.
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Strength and Cost Comparison of Normal and  Fly Ash based Concrete

Strength and Cost Comparison of Normal and Fly Ash based Concrete

In addition, in January 1983, the environmental protections agency published federal comprehensive procurement guidelines for cement and concrete containing fly ash to encourage the utilization of fly ash and established compliance deadlines. This document is sponcerd by the U.S. Department of transportation through the Federal Highway Administration, in cooperation with the American Coal Ash Association and the United States Environmental Protection Agency. The United States Government assumes no liability for its contents or use. The Federal Highway Administration endorses no products or manufacturers.
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