Oct 06 32 WHAT IS WATER CEMENT RATIO The water cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix EFFECT OF WATER CEMENT RATIO ON CONCRETE A lower ratio leads to higher strength and durability but may make the mix difficult to work with and form Work ability can After concrete is placed the concrete increases in strength very quickly for a period of 3 7 days Concrete which is moist cured for 7 days is about 50 stronger than uncured concrete Read about properly curing concrete slabs Water curing can be done after the slab pour by building dams with soil around the house and flooding the slab
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Aug 18 32 So sufficient amount of water is necessary for hydration as well as for increase in strengthWater also imparts workability to concretebut excess water cause concrete to be porous Hence for a certain limit strength increase with the increase of water cement ratioBut after that strength decreases with the increase of water cement ratioBecause of improper calculation of water cement ratio gives an adverse effect like segregation bleeding decrease in strength of concrete decrease in durability of concrete etc These steps will help you to calculate water cement ratio in the design of the concrete mix so that you can control the quality of concrete Also Read
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The discussion about relation between strength of concrete and water/cement ratio has discussed in many posts but aggregate/cement ratio has not yet been discussed and it is believed that this ratio is not very important But actual situation is not always same especially when regular size of Sep 14 32 This video introduces how water to cement ratio impacts compressive strength tylerley
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The water reducing retarder slows the hydration of the cement and allows workers more time to place the concrete High strength concrete is specified where reduced weight is important or where architectural considerations call for small support elements By carrying loads more efficiently than normal strength concrete high strength concrete Abrams law also called Abrams water cement ratio law is a concept in civil engineering The law states the strength of a concrete mix is inversely related to the mass ratio of water to cement As the water content increases the strength of concrete decreas
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DUFFABRAMS CLASSICAL LAW OF W/C For plastic mixture using neat and clean aggregates the strength of concrete under specified conditions is governed by the net quantity of water mixed per bag of cement OR The strength of the concrete is only depended upon W/C ratio provided the mix is workable SC Volorne or a oloys B= H oJul 07 32 The 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 ratio
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Factors Affecting Strength of Concrete Concrete strength is affected by many factors such as quality of raw materials water/cement ratio coarse/fine aggregate ratio age of concrete compaction of concrete temperature relative humidity and curing of concreteWater permeability increases exponentially when concrete has a water cement ratio greater than 50 Durability increases the less permeable the concrete mix is Strength improves with lower water cement ratios A 45 water cement ratio most likely will hit psi pounds per square inch or greater A 50 water cement ratio will likely reach
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Jan 17 32 Water cement ratio can be defined as the ratio of the volume of water to the volume of cement used in a concrete mix Water has a great role on the strength and workability of concrete After lots of experiments it has been found that for a specific proportion of materials in a concrete mix there is a certain amount of water that gives maximum Purpose of Water The purpose of water in concrete to composite the Cement Sand and Coarse aggregate In concrete the cement was the bonding agent if the amount water increase or decrease it will affect the bonding of material and it will be a chances to lose the workability and Strength
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Concrete is a chemically combined mass which is manufactured from binding materials and inert materials with water It is most popular construction material due to its unique durability and reasonable strength more interestingly can be modified and designed for wide range of strength requirements and set under variable environmental conditionsMay 18 32 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
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If the water/cement ratio increases the k value decreas This is caused by the delayed puzzolanic activity of the fly ash In table 1 and 2 and figure 3 the linear relationship between water/cement ratio and compressive strength are given for a reference and fly ash concrete According to the standards a maximum water/cement ratio of 065 is These cement and concrete standards allow laboratories all over the world to test and evaluate concrete mixtures to ensure their strength and safety These standards help to identify the various properties of concrete including strength elasticity hardness and workability List of cement standards and concrete standards developed by ASTM
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Excess Water In Concrete Nothing is easier than adding excess mixing water to premixed concrete at building sit And nothing is more likely to reduce the strength of the concrete or make repairs to a concrete construction necessary or more likely to damage a contractor s reputation for Adjusting the cement type and quantity Reducing the water/cement ratio Utilizing supplementary cementitious materials SCMs Altering the aggregates type and gradations Additionally high early strength concrete can be achieved through a 4x4 Concrete System
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EFFECTS OF SALT WATER ON CONCRETE CIVIL ENGINEERING PROJECT TOPICS Concrete is an artificial engineering material made from a mixture of Portland cement water fine and coarse aggregates and a small amount of air It is the most widely used construction material in the worldWater/cement ratio this is defined as the mass of water divided by the mass of cement in a mix For example a concrete mix containing 400 kg cement and 240 litres =240 kg of water will have a water/cement ratio of 240/400=06 The water/cement ratio may be abbreviated to w/c ratio or just w/c
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Presence of impurities in water for concrete mix leads to decrease in structural properties of concrete such as strength and durability to a large extent The effect of water impurities on properties of concrete can be expressed mainly in two terms In terms of the difference in the setting times of DUFFABRAMS CLASSICAL LAW OF W/C For plastic mixture using neat and clean aggregates the strength of concrete under specified conditions is governed by the net quantity of water mixed per bag of cement OR The strength of the concrete is only depended upon W/C ratio provided the mix is workable SC Volorne or a oloys B= H o
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