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But in reality, the strength at 28th day is less compared to the long-term strength that it can gain with age. The concrete strength variation with age can be studied by different methods. The figure-1 below shows the strength variation of a concrete present at dry and wet condition.
Strength of concrete: 1: 16%: 3: 40%: 7: 65%: 14: 90%: 28: 100%: 90: 115%: 180: 120%: 360: 130%
1 de ago. de 2014 · Earlier ECP [3] considered compressive strength gain as a parameter of age through the coefficients for ordinary Portland cement concrete strength as 0.4, 0.75, 1.0, 1.176 and 1.33 for 3, 7, 28, 90 and 360 days age, respectively.
Average compressive strength of the concrete cube =..... N/mm 2 (at 28 days) Compressive Strength of Concrete at Various Ages. The strength of concrete increases with age. The table shows the strength of concrete at different ages in comparison with the strength at 28 days after casting.
Figure 3 shows the ratio of concrete strength at age (t) relative to the 28-days compressive strength. In this figure the estimation curves for the ACI and fib models are drawn for comparison with experimental data.
23 de ago. de 2022 · The results indicated that for all concrete specimens more than 3 days old, the error of the strength estimation decreased to within ±15%, demonstrating that this unified equation has substantial value for application in decision-making processes for major construction procedures (e.g., applying post tensioning or removing formwork supports).
4 de jul. de 2023 · Similarly, concrete with expanded glass aggregates (M2-EG) demonstrated decreased compressive strength with increasing temperature and age. The strength ranged from 94.3% to 8.6%, and 88.9% to 10.3% at 120 and 240 days, respectively.
