26/03/2018The effect of water-cement ratio on abrasion resistance, porosity and hydraulic conductivity coefficient of Nano silica concrete has been studied in this research 13 Categories
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The compressive strength of concrete in a particular temperature is related to. The effect of water-cement ratio on abrasion resistance, porosity and hydraulic conductivity coefficient of Nano silica concrete has been studied in this research (paper). The compressive strength of concrete in a particular temperature is related to
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The practical range of water-cement ratio ranges from 0.3 to 0.8, which gives weak and stiff concrete, respectively. Weak concrete means a fairly wet concrete. Compressive strength of about 5600 psi can be obtained in the concrete of the water-cement ratio 0.4. This value will go down to 2000 psi when a water-cement ratio of 0.8 is used.
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The tests showed that the abrasion resistance increases with the compressive stre ngth. Holland studied the abrasion resistance of concrete with 11 to 15% silica fume and water/cement ratio (w/c) ranging between 0.24 and 0.34 to repair the Kinzua Dam in Pennsylvania. The concrete had, after 28 days, compressive strength of until 79MPa.
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The water-cement ratio is one of the key factors effecting on concrete properties. Abrasive resistance, porosity, efficiency and like all are directly or indirectly affected by the above parameters. In engineering work the underlying assumption is the fact that the compressive strength of the concrete gained on a specific temperature depends on
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04/05/2013The 7th day strength increases as the proportion of crushed over burnt bricks increases and the water content reduces, reaching the highest value of 35.0 N/mm2 . This corresponds to gravel – over burnt ratio of 2:2 and water – cement ratio of 0.4. Beyond this ratio of 2:2 (gravel to over burnt bricks), the strength decreases with
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04/03/2017The water/cement ratio influences the durability properties of concrete in a significant way. Decreasing the w/c value would lead to a reduction in concrete porosity and accordingly, lower permeability and higher durability. In general, the capillary pores (ranges in size 10 – 100 μm) depends on the w/c ratio with lower capillary porosity
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Fig. 8.4 shows a relation between compressive strength and cement/water ratio which gives a straight-line in the range of cement/water ratio between about 1.2 and 2.5. Whose equation may be as- According to T.C. Powers the influence of water/cement ratio on strength does not truly constitute a law as the water/cement rule does not include
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3.1 Effects of Water-Cement Ratio on Compressive Strength Fig. 1 shows the influence water to cement ratio on concrete compressive strength for concretes having different maximum sizes of coarse aggregates (12.5, 19.0 and 25.0 mm) and concrete mix ratio of 1:2:4, 1:1.5:3 and 1:1:2. It is seen from this figure that the concrete strength
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tion, abrasion resistance, compressive strength, indirect tensile strength and flexural strength. An experimental study was carried out on two types of concrete with cement content 350 and 450 kg/m3 with water/cement ratio of 0.50 and 0.40 respectively to have a slump of
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29/01/2021The water–cement ratio = the weight of water to the weight of cement utilized in a concrete mix. Effect of water cement ratio on concrete:-. A lower ratio results in higher strength and durability, but may make the mix difficult to figure with and form. Work-ability are often resolved with the utilization of plasticizers or super-plasticizers.
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04/08/2018Abstract This paper investigates the effects of adding natural rice husk ash collected from uncontrolled burning and without previous grinding (NRHA) as cement replacement in concrete. To obtain an adequate particle size, NRHA was mixed with coarse aggregate for a convenient period of time before adding the other components. Compressive strength, water
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achieve a maximum water/cement ratio of 0.45 to reduce permeability and incorporation of at least 20% fly ash or 60% slag; either of which would also be beneficial in reducing any tendency for alkali silica reaction. Verma et al. (2013) evaluated effect of chloride attack and concrete cover on the probability of corrosion.
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Some studies reported that the abrasion resistance of concrete pavement is affected by the surface texture, water-cement ratio, SCM type and combination [6,7]. The studies reported that a decreased in abrasion resistance with increase in water-cement ratio, increases with compressive strength and use of fibre and that
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water-cement ratio of 0.45. A total sample of 72 cube specimen of size 150mm x 150mm x 150mm were cast and tested the compressive strength at 28 84 days, Water absorption and Young's modulus were noted at 28 days. The various physical properties and chemical properties of Sea sand due to effects of sea water were investigated.
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12/06/2021This value is 1.5% when comparing the 0.5 and 0.4 water-cement ratios. For the 10% percentage replacement, these values are 26.21% increase for the 0.6 and 0.5 water- cement ratios and 3.58% increase for 0.5 and 0.4 water- cement ratios. This is an indication that increasing the water-cement ratio of any concrete will decrease compressive strength.
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This paper investigates the effects of cement content and water/cement ratio on workable fresh concrete properties with slump changing between 90 to 110 mm, and determines the relations among fresh concrete properties such as slump, compacting factor, VeBe, unit weight and setting times of mortar with temperature history.
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The ratio of the amount of water to the amount of cement by weight is termed the water-cement ratio. The strength and quality of concrete depend on this ratio. The quantity of water is usually expressed in litre per bag of cement. if water required for one bag of cement is 30 litres, the water-cement ratio is equal to 30/50 = 0.6.
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affects on its execution of the concrete. Depending on the many studies in concrete field that found concrete with the high strength can be accomplished by reduce the water /cement ratio (w/c).that happened without any bad effect on the properties of concrete and
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Effect of watercement ratio on 28 day compression and flexural tensile strength from CIVIL 107 at U.E.T Taxila. Study Resources. Main Menu; by School; Effect of watercement ratio on 28 day compression and. School U.E.T Taxila; Course Title CIVIL 107; Uploaded By CountKangarooMaster1478.
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WHAT IS WATER CEMENT RATIO? The water-cement ratio is the ratio of the weight of water to the weight of cement used in the concrete mix. A lower ratio leads to greater strength and durability, but the mixture may be harder to work with and build. Using plasticizers or superplasticizers can solve the problem. EFFECT OF WATER-CEMENT RATIO ON
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02/04/2020Reinforcing fiber and silica fume of concrete can be considered as one of the most widely used additives. In this study, with a review of the history and advantages of using silica fume and polypropylene fibers in concrete, 380 concrete laboratory samples were constructed, of which 25 mixing designs with water–cement ratio of 0.35 and fiber content of 0.2, 0.3, 0.4
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Stimuli were processed through a simulated three-channel, fast-acting, wide dynamic range compression hearing aid. Consonant recognition performance decreased as compression ratio increased and presentation level increased. Interaction effects were noted between SNR and compression ratio, as well as between presentation level and compression ratio.
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The effect of water-cement ratio on abrasion resistance, porosity and hydraulic conductivity coefficient of Nano silica concrete have been studied in this DOAJ is a community-curated online directory that indexes and provides access to
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This study presents results of a laboratory investigation on the effect of water-cement ratio on compressive strength of laterite concrete This study aimed is to determine the effect of water-cement ratio in the compressive strength of laterite concrete. Thirty-six (36) cubes of 100 100 100mm were cast, cured and crushed at 7, 14, 21 and
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25/05/2015Summary Tests were made on damp and dry aggregates to discover how the definition of "effective water/cement ratio" is affected by aggregate absorption. Analysis of the results indicates that mixes with saturated river gravel aggregates give higher strengths and compacting factors than supposedly similar mixes made with dry aggregates. The coating of
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The research was conducted to study the effect of water-cement ratio on the compressive strength of gravel-crushed over burnt bricks concrete. pp43-52. Shamsai, A., Rahmani, K., Peroti, S. and Rahemi, L. (2012), "The Effect of Water-Cement Ratio in Compressive and Abrasion Strength of the Nano Silica Concretes", World Applied Sciences
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of porosity, degree of hydration and the effect of temperature on the strength of Japan OPC were evaluated using the water/cement ratio (w/c) of 0.40 and intensive procedures in sample preparation and testing. High early compressive strength development, fast degree of hydration and decreased porosity were observed in 3-day cement cured at 40oC
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07/07/2008The first rarely mentioned fundamental assumptions for the strength versus water-cement ratio relationship are discussed, namely, that: (a) the strength of structural concrete is controlled by the strength of the cement paste in it; (b) the strength of a cement paste depends strongly on the porosity in it; and (c) the porosity (capillary) is a function of the water-cement
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16/02/2018Investigation of water-to-cement ratio on compressive strength. Listen. The effect of water content on strength was investigated at the w/c ratios of 0.51, 0.59, 0.67 and 0.76. Each level had four replicates, each from a new batch, leading to 16 concrete batches. Effect of water-cement ratio on the compressive strength of gravel – crushed
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According to the results obtained, the optimal amount of fiber used is 0.3% for flexural and tensile strength, but only 0.1 % for compressive strength by volume of concrete, while 0.2 % by volume proved best for hydraulic conductivity coefficient and
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e) Compressive Strength (After 7 Days) Table 8 shows different compressive strength values at different aggregate cement ratios. Using this, graph between compressive strength and A/C ratio is shown in Fig.10. It is clear from the Fig.10 that as A/C ratio increases compressive strength of pervious concrete decreases.
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The purpose of this study was to investigate the effects of polypropylene fiber and water/cement ratio on the compressive, tensile, flexural and abrasion strength, porosity and hydraulic conductivity of nano-silica concrete. Other properties of
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and compressive strength of the concrete. Workability is an important parameter in concrete designing; basically it depends on the several factors like aggregate scale, water cement scale. And in this case where a steel fibres reduce the quantity of aggregates, therefore it is necessary to check the effect of steel fibre on the
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01/04/20081.. IntroductionCompressive strength of concrete has been accepted as the most important mechanical property of structural concrete. The relationship between concrete composition and compressive strength has long been a matter of interest for researchers .The factors influencing the strength of concrete are: the amount and type of cement, w/c ratio,
WhatsApp:+8617329420102The compressive strength increased from about 40% (M2) to 45% (M1) beyond which the compressive strength decreased linearly as the coarse aggregate content increased. 3.2. Abrasion Resistance. Effect of the number of revolution of abrasion wheel on wear resistance of various mix proportions is summarized in Figure 7.
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01/04/2012It has been well established that cement content, water–cement ratio, air content, workability, type of finish, and curing conditions have influence on characteristics of concrete surface. Studies [3], [4], [5] have shown that compressive strength is the most important factor governing the abrasion resistance of concrete.
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Drying Shrinkage: If water-cement ratio is raised, the drying shrinkage is also raised and concrete become poor in tensile strength and consequently, cracks build up on the concrete surface. 3. Loss of Abrasive Resistance: Abrasive resistance of concrete is related to its strength directly.
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The tests were abrasion resistance, compressive strength, flexural strength (FS), and dynamic modulus of elasticity (DME). The tests results revealed that it is recommended to develop HPSDC with a C/F aggregate ratio of 1.6 as the abrasion resistance and the mechanical properties of the HPSDC showed ultimate performance at this ratio. 1
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Abstract— Variable density of concrete mix of grade M20 with cement-water ratios ranging from 0.66to 0.54, within 7 to 28days of curing time, were experimentally investigated in this paper. The experiment was carried out to investigate the effect of water-cement ratio on the density of concrete. Density of concrete mixes was found to decrease with decrease in water-cement ratio.
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