Water-reducing agents compressive strength

Fig. 1.36 The relationship between water-cement ratio (water and air-cement ratio) and compressive strength of concrete containing lignosulfonate and hydroxycarboxylic-acid-based water-reducing agents.

F/g. 1.46 The increase in compressive strength of concretes containing various water-reducing agents. 

Table 7.30 A lignosulfonate-based water-reducing agent allows lower cement contents to be used in concrete blocks whilst maintaining the compressive strength...

An increase in the flow of the mix will have a beneficial effect on compaction and, as a result, compressive strength will improve. The presence of the water-reducing agent may also improve the early strength by affecting the setting and hardening rate of such mixes. 

Figure 4- exhibits the effects of nonionic surfactant content, HLB and antifoamer on the flexural and compressive strengths of epoxy-modified mortars with a modified polyamide-amine hardener content of 55%> a polymer-cement ratio of 4-0% and a water-reducing agent content of 3 0 %, which are the optimum values recommended from the above test results. The flexural strength of the epoxy-modified mortars with a nonionic surfactant of HLB 9 5... 

Effects of water-reducing agent content and polymer-cement ratio on flexural and compressive strengths of epoxy-modified mortars. 

Fig. 1.3 The effect of air entrainment on compressive strength of concrete containing a water-reducing air-entraining agent and a normal air-entraining agent.

Series Mix Air- entraining agent Water-reducing admixture Cement content (kg m - ) Water- cement ratio 28-day compressive strength (N mm-2) Air content (%) Slump (mm) Durability factor ASTM C290 1967... 

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