Ch. Karnchang Plc (CK) expects its construction backlog to hit Bt50b within two years, up from Bt20b this year, as long as the government follows through with its heavy infrastructure spending, says chief executive Plew Trivisavavet. Bidding for many construction megaprojects has been delayed by more than five years. The airport Rail Link was the last major project for which the government held bids, in 2003, but this year it has initiated some projects that had been delayed for years.