12-. can cause unsoundness of cement. b - Alkalis C- Cao a- sulfate compounds 13- At any stage of hydration, the . .represent that part of the gross volume which has not been filled by the products of hydration. a- capillary pores d- Cao and MgO b-gel pores c- air voids d- not all of them 14- Rapid-hardening Portland cement is due to a- C3S content higher than 55% all them. 15- Low heat Portland cement is type . .as Astm C150 а- Туре ! b- specific surface 450 to 600 m/kg c- all of them d- not of b- Type IV - (Type III) d-(Туpe V)

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Environmental Consequences of Fossil Fuel Use

Fossil fuels are organic materials found inside the earth's surface. They are mainly composed of dead remains of plants and animals. The primary component constituents of fossil fuels are carbon and hydrogen, which are usually burnt to produce energy. Fossil fuels are believed to be formed millions of years ago when dead remains of animals and plants were subjected to high heat and pressure.