A worker cleans a cement truck at a ready mixed concrete plant of Siam Cement in Nonthaburi province, on the outskirts of Bangkok July 30, 2013. Siam Cement Pcl, Thailand's largest industrial conglomerate, is finally catching up with the capacity it overbuilt before the Asian financial crisis as it feeds demand from frontier markets including Myanmar and Cambodia. Picture taken July 30, 2013. REUTERS/Kerek Wongsa (THAILAND - Tags: BUSINESS)