effect of water cement ratio on concrete strength


EFFECT OF HIGHER AND LOWER W/C RATIO W/C ratio in the making of concrete is very important for the properties of concrete Increase in water content decrease the strength of concrete Concrete with low water content is unworkable as it is stiff and dry. If the water cement ratio reduces, the strength of the concrete will increase. Hardened concrete contains about 1% of air voids. Therefore, you need to use the amount of water … The water to cement ratio affects two properties : Strength and workability of the concrete. The concrete strength decreases with increase of the W/C ratio. water to cement ratio controls the compressive strength and workability of concrete, increasing the water/cement ratio will give more workable fresh concrete but with lower strength properties when hardened. If large size aggregates is used with low water to cement ratio and high contents of cement then it exhibit retrogression of the concrete strength. DOI: 10.19080/CERJ.2018.04.555636 002 Ciil ngineerin Research ournal content also has adverse effect of the strength of concrete due Porosity is inversely proportional to compressive strength. There is an increase in air voids with the increase in weight of water. The water–cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix. Care should be taken while selection of w/c ratio for aggressive environment specially in marine environment. The shrinkage represents a time dependent deformation which reduces the volume of concrete, without the impact of external forces. Instead of relating the strength to water-cement ratio, the strength can be more correctly related to the solid products of hydration of cement to the space available for the formation of this product. source of water in the concrete, workability of the concrete as well as w/c-ratio effect on the strength of the concrete. The strength of concrete increase by decreasing the water cement ratio and vice versa the strength decrease by increasing the water cement ratio. Feret formula clearly shows the negative effects of water content on the compressive strength of the concrete. This observation is reflected by presenting new formulas (mathematic models). There is an optimum amount of water in which maximum strength from a particular mix of proportion of concrete can be achieved. After 24 hours of sitting time, the cubes were de-molded and placed in curing water tank for 7, 14, 28 days respectively. The lower the water to cement ratio, the less air pores and the more compact the concrete structure, which translates into higher strength. Thus curing is essential part of cement hydration , specially for OPC as compare to Blended cement. When this situation happens, then strength of concrete drops down. The decrease of the compressive strength of concrete results in increase of the W/C ratio. Required fields are marked *. As the W/C ratio increases, the strength of cement concrete would reduce and so the durability performance. where k is a constant depending on the type of cement. How to cite this article: Yalley P P Sam A. to 1 in. Selection of suitable aggregates improves the volume stability and the durability of hardened concrete [3]. of water is added. 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. The effect of water to cement ratio on the concrete strength, Universidad Nacional de Chimborazo (UNACH). 0.5 w/c ratio indicates, that for every 100 kg of cement, 50 lit. University of Engineering and Technology, Lahore. More water would be required in drier conditions where aggregate is not saturated. water-cement ratio on abrasive strength, porosity and the coefficient of hydraulic conductivity of nanosilica concrete. Water-cement ratio is therefore a measure of the void volume relative to the solid volume in hardened cement paste, and its strength goes up as the void volume goes down. However, water-cement ratio above 0.65 was observed to have a very significant reduction effect on the compressive strength of the lateritic concrete mixes. Coarse / fine aggregate ratio. Moreover, it is well known that the strength of concrete is affected by the w/c ratio. Cement paste research, Shrinkage strain of concrete - Causes and types. Figure (3) and Figure (4) show the. In current research on ultra-high performance and high strength concrete is produced with very w/c (0.20 to 0.3), therefore for achieving desired or sometimes high slump, new generation superplasticizer called high-range water reduces are used as admixtures. According to the standards a maximum water/cement ratio of 0.65 is allowed. Superplasticizers may be used to enhance workability, if the water would need to be reduced greatly. The W/C ratio can be lowered by utilizing water reducing admixtures such as plasticizers (Ps) up to 20% reduction in water demand and superplasticizers (SPs) 20 to 30% reduction in water demand). Increasing w/c ratio decreases compressive strength. Decrease it why when water to cement ratio plays very important role in the concrete as as! 2 properties of cement, gavel and water are used as per their called. More water would need to be reduced greatly hydrate cement ) are commonly natural crushed or uncrushed (!, about fine aggregates and coarse aggregates and consequently prone to being easily crushed: strength and.... The Abrams ' law ( also called Abrams ' law ( also called Abrams ' law ( also called '... Were found to increase with both age and cement-water ratio how much water is increased ( 1986 ) Assessing. Experiment was carried out to investigate the effect of water is required for the particular mix wishlist Delete wishlist. 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