| you are: Porosity of a cement stone
The Quantity of the connected water at full hydration portlandtsementa Shmaks can fluctuate from 0,25 to 0,3 (to weight of cement); Hence, if in 28-daily allowances age cement has connected 15% of water (considering from weight of cement). It means that in concrete with the expense of cement 300 кгм3 180 kg knitting (60%) have entered interaction with water, and 120 kg (40%) have still remained in a kind klinkernogo fund. In general and can be in limits from 0 to 1 (at full hydration of cement). Ñòèðàëüíàÿ ìàøèíà Ardo - ýòî âîïëîùåíèå ïðàêòè÷íîñòè è êîìôîðòà. Ardo ñàéò îôèöèàëüíûé.
Hydration Degree has the big technical and economic value. At increase in degree of hydration of cement the volume of new growths increases, porosity of a cement stone decreases and quality of a time improves. Durability and durability of concrete thus raises. Therefore it is necessary to improve technology of concrete, achieving the fullest use knitting that is equivalent to its economy. Çàìåíà áàòàðåé
Porosity of cement stone pobshch develops from gelevoj Jag, capillary Jakap and air JAVOzd porosity.
Thus, porosity of gel and kontraktsionnyj the volume making a part gelevoj of porosity, degrees of hydration of cement are directly proportional. ' Superfluous ' the water which has not gone in in a time cement gel, settles down between units of particles of gel and forms a capillary time.
Capillary porosity of Jakap define taking into account that cement gel connects chemically and adsorbtsionno about identical a quantity of water (on 25% from weight of cement), i.e. The quantity ' superfluous ' the water forming a capillary time, will be equal
The General porosity of densely laid cement stone will be equal to the sum gelevoj and capillary porosity;
|
