Discussion
Gel pores and capillary pores differ in that capillary pores are
Answer: D
Correct answer: larger and represent space once occupied by water
Capillary pores are the remains of the water-filled space between cement grains that hydration products have not filled, typically tens of nanometres upward, and they are what govern permeability and strength. Gel pores are far smaller and are an intrinsic part of the calcium silicate hydrate itself, so their volume is fixed by how much gel there is. Only the capillary porosity can be reduced, by lowering the water-cement ratio and curing properly.
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