Strength and Some Durability Properties of Concrete Containing Rice Husk Ash Produced in a Charcoal Incinerator at Low Specific Surface

International Journal of Concrete Structures and Materials

Table 7 Effects of RHA on strength properties of concrete (free w/b = 0.50).

RHA replacement (%)	Average compressive strength (N/mm²)							Tensile strength (N/mm²)
RHA replacement (%)	3 days	7 days	14 days	21 days	28 days	90 days	180 days	28 days
0	23.36	26.47	34.93	33.61	37.57	39.33	45.98	2.618
5	24.90	27.62	33.60	34.68	38.80	45.18	46.85	3.476
10	25.17	30.53	30.01	35.86	44.90	44.00	49.42	3.389
15	25.19	31.06	37.11	36.22	41.33	39.89	46.66	3.694
20	19.91	26.02	29.83	37.90	32.81	36.89	39.11	3.294