EPS beads content for the mixtures were kept constant at 0.05 m3. The effects of air content, water-cement ratio, and aggregate type on the flexural fatigue strength of plain concrete @inproceedings{Thomas1979TheEO, title={The effects of air content, water-cement ratio, and aggregate type on the flexural fatigue strength of plain concrete}, author={T. L. Thomas}, year={1979} } Adapted from Table 03, ACI 211.1, ACI 211.3, and Hover 1995. A lower ratio leads to higher strength and durability, but may make the mix difficult to work with and form. To determine the effect of Portland cement (PC)/EPS ratio, on the compressive strength of EPS concrete, 1/0 (control sample), 1:4, 1:2, 3:4 and 1:1 mix proportion by volume were used. 4. The water/cement ratio was set as the variable between 3 Concrete Mixes (to determine the effect of water/cement ratio on the strength and workability of the concrete). source of water in the concrete, workability of the concrete as well as w/c-ratio effect on the strength of the concrete. Water/cement ratio is expressed in decimal. The laboratory work consisted of the preparation of nine concrete with three different w/c-ratio and each w/c-ratio is divided into three category of air content ranging from 2% to 10% by volume. cement were investigated. 17283. Within each of the four concrete types examined in this experiment, all used the same aggregate, had the same cement content, and had virtually the same water-cement ratio. 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 concrete. 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. Water was measured into a bucket using measuring cylinders. Thomas, Thomas Lee, "The effects of air content, water-cement ratio, and aggregate type on the flexural fatigue strength of plain concrete" (1979). with age but decrease as the water-cement ratio increases. EFFECT OF WATER CEMENT RATIO ON CONCRETE. Water content quantities used are shown on table 1. Strength is based on cylinders moist cured 28 days per ASTM C31 (AASHTO T23). These two factors have a profound influence on the strength and durability of concretes made from a single cement. 3. How Does The Water/Cement Ratio Affect Concrete? Work-ability can be resolved with the use of plasticizers or super-plasticizers. However, a mix with a ratio of 0.35 may not mix thoroughly, and may not flow well enough to be placed. Based upon water-cement ratio were not intended to be variables. Table 1 – Relationship Between Water to Cementitious Material Ratio and Compressive Strength of Concrete Strength is based on cylinders moist-cured for 28 days in accordance with ASTM C21 (AASHTO T 23). The effect of water/cement (w/c) ratio on the mechanical properties such as compressive strength and split tensile strength of cement mortar cylinders and cubes was investigated experimentally for 28 days curing period as per IS standard. Retrospective Theses and Dissertations . Water/cement ratio has more influence on strength than cement content. Water content = (water/cement ratio) x cement weight. 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