National demand for cement is up over last year’s record levels and bringing with it the possibility of some regional cement shortages. This situation hasn’t affected Colorado as severely as other states, but industry experts say that could change soon.  At least two Colorado companies -- Holcim (US) Inc. in Florence and Ready Mixed Concrete in Denver -- are cashing in as the country’s demand for cement outpaces supply. In the past year, Ready Mixed Concrete Co. has raised its prices 10 per cent.  "There have been steady price increases; we’re just paying a little bit more," said Dick O’Brecht, president of the Associated General Contractors of Colorado. Holcim is importing cement into the region to meet the demand, spokesman Tom Chizmadia said. He declined to discuss whether Holcim has raised its prices.  Published under Cement News