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Extra resources for Durability of Concrete Structures Investigation Repair Protection

Sample text

This is confirmed by the data of Fig. 5, which also indicate that the effect of fineness on strength is greatest at earlier ages, decreasing with time as the hydration proceeds. 4), the cement grains become encapsulated in a dense layer of hydration products. This layer retards the diffusion of water, and thereby slows down hydration until, at some stage, it is stopped completely. The rate of hydration at this later stage is determined, therefore, by the rate of water diffusion, and the size of the cement grains becomes of secondary importance.

The rate of hydration at this later stage is determined, therefore, by the rate of water diffusion, and the size of the cement grains becomes of secondary importance. 5. DIFFERENT TYPES OF PORTLAND CEMENT As has already been mentioned, the properties of Portland cement, which is a heterogeneous material, are determined, qualitatively at least, by the properties of its major constituents. 2. e. by the Alite and the Belite. On the other hand, the C3A increases the susceptibility of the cement to sulphate attack, its heat of hydration and probably its shrinkage as well.

1–37. 10. Odler, I. , Pore structure of hydrated calcium silicates. J. Colloid. , 40(2) (1972), 199–205. 11. B. , Structural properties of calcium silicate pastes: II, Effect of curing temperature. J. Am. , 62(7) (1977), 362–6. 12. Goto, S. , The effect of W/C ratio and curing temperature on the permeability of hardened cement paste. , 11(4) (1981), 575–9. 13. L. , Shrinkage of tricalcium silicate pastes: Superposition of several mechanisms. Il Cemento, 75(3) (1978), 391–8. 14. , Effect of hot environment on the strength and porosity of Portland cement paste.

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