PORTLANDSEMENT

PORTLANDSEMENT (az anglisi Portland — nomi nimjaziraest dar janubi Britaniyai Kabir), yak nav sementro guyand, ki asosai az silikati kalsiy iborat ast. Portlandsement holo dar coxtmoni navi khelo mamuli sement meboshad. Portlandsementro az klinker (khishti bisyor sakhti otashbardori zahnokash)-i gachdor (3—7%) istehsol mekunand; ba on moddahoi digari faoli minerali (10—15%) niz hamroh mekunand. Klinker masolehest, ki az omekhtai ashyoi khomi suni (taqriban az 75% karbonati kalsiy, odatan ohaksang va 25% gil) bo usuli gudozish pazand. Ashyoi khomi Portlandsementro beshtar dar otashdonhoi charkhzananda (haroratash 1450— 1500^RS) pukhta mekunand. Khosiyati Portlandsement asosan ba tarkibi klinker va darajai sudagii on vobasta ast. Muhimtarin khususiyati Portlandsement az tasiri ob shakh shudan ast. Dar SSSR khelhoi gunoguni Portlandsementro istifoda mebarand.

Ad.: Voljenskiy A. V., Burov Yu. S., K o l o k o l n i k o r V. S., Mi­neralnie vyajushie veshestva, M_., 1973.