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  • EFFECTS OF CARBONATION ON MECHANICAL PROPERTIES .

    The chemical compositions of cement and blast furnace slag expressed in percentage by weight of the constituent oxides are shown in Table 1. The coarse aggregate with a size range of 6 ~ 25 mm was used The fine aggregate was river sand with a maximum size of 4 mm and fineness modulus of 2.72.

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  • What is Water Cement Ratio? - Guide & Calculation – Civilology

    What is Water Cement Ratio? Water Cement Ratio means the ratio between the weight of water to the weight of cement used in concrete mix. Normally water cement ratio falls under 0.4 to 0.6 as per IS Code 10262 (2009) for nominal mix (M10, M15 .. M25) We all know that water cement ratio will directly affect the strength of concrete.

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  • 3 Ways Moisture Affects Concrete Strength - Polygon

    How Moisture Affects Concrete Strength. Increased space between cement grains: Higher water-to-cement ratios result in greater spacing between the aggregates in cement, which affects compaction. Similarly, increased moisture levels reduce the concrete''s compressive strength and durability.

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  • Effect of Water-Cement Ratio on Pore Structure and ...

    Effects of the water-cement ratio on the relative viscosity of the cement paste, as well as pore structure and strength of the hardened foam concrete, were discussed. Results showed that water-cement ratio can influence the size, distribution, and connectivity of pores in foam concrete.

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  • Technical ReportTHE 2Jly16 I.mil

    land-side cylinders (except for the GMk high W/C ratio curve which is coincident for land and sea side), curves for both sides show increasing strength with time. The effect of poor-quality aggregate on strength of concrete can be seen in Figure 3 by comparing the GMR concrete strength to the SG and ENG concrete str"ngths.

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  • 2 Concrete Materials

    The properties of the aggregate have a major effect on the durability, strength, shrinkage, unit weight, and frictional properties of hardened concrete, as well as the mix proportions, slump, workability, bleeding, finishing characteristics and air content of freshly mixed concrete.

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  • Effect of Hand Mixing on the Compressive strength of Concrete

    This paper presents the effect of hand mixing on the compressive strength of concrete. Before designing the concrete mix, sieve analysis of sharp sand and chippings was carried out and their fineness moduli were determined. Also the dry weight of chippings and the specific gravities of both sand and chippings were determined.

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  • The Effect of Cement and Water Cement Ratio on Concrete ...

    Laboratory trials were conducted to compare and investigate the effect of 12 % and 15 % cement content in concrete mixtures at five different w/c ratios. In total, 60 concrete mixtures were cast and tested to determine dry density, compressive strength and skid resistance of concrete paving block samples.

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  • The Effect of Water Content on the Compressive Strength of ...

    Abstract. This water/cement ratio would yield compressive strength of about 23.59 MPa (3425 psi) for 1:1:2 and 21.45 MPa (3110 psi) for 1:1½:3 by weight in 28 days. The water/cement ratio recommended for 1:2:4 mix by weight is 0.75. This would yield about 18.50 MPa (2682 psi) in 28 days.

    Effect of W/C Ratio on Durability and Porosity in Cement ...

    The conclusions on effect of W/C ratio on durability and porosity in cement mortar with constant cement amount are as follows.(1)Cement mortar with constant W/C ratio of 0.45 and air amount 5.2% is prepared and its durability performances are quantitatively investigated .

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  • Effect of Aggregate Size on Strength| Concrete ...

    Effect of Aggregate Size on Strength. A.: If the quantities of coarse aggregate, fine aggregate, cement and water are the same for both mixes, the mix with l l/2-inch aggregate will have greater slump and will probably bleed more. If both mixes are plastic the resulting strengths of the .

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  • Jared A. Ruekberg J1819 - California State Science Fair

    attributes, including strength. The hypothesis states that the most common mixture of materials does not produce the strongest concrete. My goal was to test the flexural strength of the most common mixture and compare it to the results of the two other mixtures. Methods/Materials To test this, three batches of concrete were mixed using different ratios of cement to set amounts of sand, gravel, and water.

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  • EFFECT OF CURING METHODS ON THE COMPRESSIVE .

    EFFECT OF CURING METHODS ON THE COMPRESSIVE STRENGTH OF CONCRETE T. James, A. Malachi, E.W. Gadzama, V. Anametem oka Department of Civil Engineering, Federal University of Technology Yola, Nigeria.

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  • AN INVESTIGATION INTO THE RELATION BETWEEN THE .

    In particular, the strength of concrete is greatly influenced. by the water-cement ratio and the relative volume of air in the mix. Since aggregates, cement, water and air have different specific, weights, the overall density of a concrete mix will depend upon the relative. amounts of these materials present.

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  • Influence of Water-Cement Ratio on Compressive Strength .

    The 14th and 28th day strength also produces same result. The 28th day strength gives a maximum value of 35.2 N/mm2 for gravel – crushed over burnt bricks ratio of 2:1 and water – cement ratio of 0.4. Table 1: Compressive Strength Test Results Ratio W/c Comp. St (N/mm2) 7 day 14 day 28 day.

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  • Influence of aggregates grading and water/cement ratio in ...

    cement:lime:sand, two types of sand and three water/cement ratios. Specimens are analyzed through flow table test, compressive and flexural strength tests. Results indicate that the increase of water/cement ratio reduces the values of hardened properties and increases the workability. Besides, sands grading has no influence in compressive strength.

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  • Effect of replacement of natural sand by manufactured sand ...

    The effect of partial replacement of natural sand by manufactured sand on the compressive strength of cement mortar of proportion 1:2, 1:3 and 1:6 with water cement ration as 0.5 and 0.55 are studied. Results are compared with reference mix of 0% replacement of natural sand by manufactured sand.

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  • Effects of Rebar Temperature and Water to Cement Ratio on ...

    Water to cement ratio (w/c) and rebar temperature had a significant influence on the rebar-concrete bond strength. The 28-day shear strength measurements showed an increase in rebar-concrete bond strength as the water to cement ratio (w/c) was reduced from 0.50 to 0.40 for both fly ash containing and non fly ash control samples.

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  • Effect of coarse aggregate size on strength and ...

    The properties of concrete were studied when the proportions of 37.5 and 19.5 mm stone in the coarse aggregate were varied. With the cement content of 160 kg/m3 and the ratio of water/cement (w/c) greater than 0.9, the compressive strength is maximum at 25 percent by weight (w/o) of 37.5 mm stone. Conversely, for the cement content of 350 kg/m3 and w/c ratios of less than 0.50, maximum ...

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  • Mortar (masonry) - Wikipedia

    Strengths of mortar change based on the ratio of cement, lime, and sand used in mortar. The ingredients and the mix ratio for each type of mortars are specified under the ASTM standards. These premixed mortar products are designated by one of the five letters, M, S, N, O, and K. Type M mortar is the strongest, and Type K the weakest.

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  • Full text of "EFFECT OF WATER-CEMENT RATIO ON THE .

    This study, thus, aimed at investigating the effect of water-cement-ratio (W/C) on the compressive strength of quarry sand concrete (QSC). It tries to establish the optimum W/C for the production of medium grade QSC using the nominal mix proportions of 1:2:4 and 1:3:6.

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  • Soil-Cement FAQs

    Soil-Cement Frequently Asked Questions Because there is no noticeable color change, how can I tell how deep my roadway materials were treated with cement? Basically, when cement is added to the soil material, the resultant mixture experiences an increase in pH—usually into the moderate to strongly alkaline range from 8.0 to 9.0.

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  • Effect of Cube Size on the Compressive Strength of Concrete

    Effect of shape of the specimen on the compressive strength of concrete has been widely studied and different relationships have been proposed between the cube compressive strength and cylinder strength. As per Indian Standards 150mm cubes are used for determining the compressive strength of concrete. Use of I00 mm cubes has its advantages.

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  • Factors Affecting Strength of Concrete

    May 01, 2015· REFERENCES: BUILDING MATERIAL AND CONSTRUCTION BY V.K. KUMAWAT.; Indian standard code 10262-2009. Factors which affect the strength of concrete: Water – Cement Ratio: Water cement ratio is one of the most important factors which govern the strength of concrete. Water cement ratio is the weight of water in proportion to weight of cement expressed in terms of .

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  • Effect of Rate of Loading on Compressive Strength of .

    The ratio of strength to rate of loading was ... of concrete. In this project the effect of high rate of loading on compressive strength of concrete has been studied. As it has been observed that strength increases at higher rate of loading, it gives false strength which may prove hazardous. ...

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  • Effect of Aggregates On Strength Of Concrete | Engineering ...

    Shape And Size Effect On Concrete Strength Aggregates shape and size has a strong influence on properties of concrete. Rough surface textured particles increase the compressive strength of concrete up to 20-30%, instead of using natural gravels that is obtained from river beds.

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  • EFFECTS OF AGGREGATE TYPE, SIZE, AND CONTENT ON .

    Tests were conducted by Nallathambi, Karihaloo, and Heaton (1984) on mortar and concrete beams of normal strength to examine the influence of specimen dimension, notch depth, aggregate size (10 mm, 14 mm and 20 mm), and water-to­ cement ratio on the fracture behavior of concrete.

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  • Effect of Crude Oil Impacted Sand on compressive strength ...

    The presence of contaminant in large degree in aggregates does not only affect the appearance of concrete (in terms of colour and smell) but also the strength developed by the concrete [3]. The effect of crude oil on the compressive strength of concrete when used as the curing medium had been considered by some

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  • "Effect of Specific Gravity on Aggregate Varies the Weight ...

    "Effect of Specific Gravity on Aggregate Varies the Weight of Concrete Cube " ... water-cement ratio in the concrete mix. Knowing the ... increase in mixing water and may affect the strength of the concrete,if cement water ratio is not maintained. d.

    Cement strengths | VVM

    Cement strengths. The mortar prisms are based on a standard ratio of cement, water and sand. The strength indication for cement has only a limited effect on the strength of concrete or mortars to be achieved. This is because a type of concrete with among others a lower water-cement factor (the ratio of cement as opposed to water)...

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  • Effect of Sand to Fly Ash Ratio on the Hardened Properties ...

    Thus it is economical to use fly ash with sand with 1:1 ratio, where a higher strength is obtained. While in case of concrete, Compressive Strength increases with increase in the ratio of sand or coarse aggregate. 1.2 Sorptivity Sorptivity is that property which denotes the capacity of a medium to absorb liquid by capillary movement [9].

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  • Influence of Calcium Sulphate on Cement Motor and ...

    parameters, such as strength, setting times, soundness, consistency etc. the sand used is ennore sand of three different grades. Calcium sulphate is added in different proportions to cement and its effect is studied at different ages.

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