8. (2 points) What are the effects of reducing w/c on porosity, permeability, an
ID: 1885264 • Letter: 8
Question
8. (2 points) What are the effects of reducing w/c on porosity, permeability, and compressive strength of hydrated cement? (Porosity: capillary pore volume/total volume of hydrated cement specimen; Permeability: a measurement of rate of flow of water through specimen) 9. (2 points) What are the effects of degree of hydration on capillary pore volume, capillary pore size, porosity, permeability, and compressive strength of hydrated cement? (Degree of hydration: hydrated cement/total cement, increases with time and temperature)Explanation / Answer
9.answer
Reduction of water-cement ratio innosilica real caused the rough strength increasesna but the conductivity coefficient and the porosity of the nanosilica concrete deceased.
By decrease of water-cement ratio from 0.50 to 0.33.
the abrasive strength of tangible was improved by 36%. Also. reduction of water-cement relation from 0.50 to 0.33. the hydraulic conductivity coefficient of the concrete reduce from 31.71 x 10.0 to 2 x 10• m/sec.I addition.
the porosity cities real was reduced to 13%while the reduction of water-cement ratio from 0.50 to 0.33 occurred. The abrasion deepness was slowly reduced as the water-cement ratio greater than before (from 0.33 to 0.50).
This murmur can be linked. the two-phase nature of real in abrasion (mortar phase and aggregate phase) that the additional water-cement ratio increase
the less rough strength of mortar phase resulted: but. the abrasive strength of real reduced towards the abrasive power of aggregates.
Wet Sand Blast was a suitable method to evaluate the power of concrete next to water.
since this method extraordinarily can sinadate the erosion cause in concrete.
diffusion Method is a suitable move toward for evaluation of real permeability.
became this method is preferred for the ratio of water deepness in the concrete to the real tube height is insignificant and this fact is achieve in nanosilica concretes.
To improve the abrasive strength of concrete. it is essential to improve the mortar stage and the aggregate phase together.
Mortar phase cm be improved by reduction of water-cement ratio, using nanosilica. appropriate curing and also collective phase was improved by abrasion-resistant aggregate like stonework aggregates.
The state of conducting scrape trial can be more approximated to the real state
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