Shares of cement producers were mixed in morning trade Monday, after President Trump said over weekend that the border wall he wants could be made of steel, rather than the concrete wall he had promised during his campaign, in an effort to reach a deal to re-open the government. Among shares of the companies that were expected to benefit from a concrete wall, Cemex SAB de CV /zigman2/quotes/203703444/composite CX +0.67% rose 0.2%, Heico Corp. /zigman2/quotes/207361354/composite HEI +0.11% slipped 0.8%, Vulcan Materials Co. /zigman2/quotes/203479463/composite VMC +0.53% rose 0.5%, CRH PLC /zigman2/quotes/202550827/composite CRH +1.21% shed 1.6% and Martin Marietta Materials Inc. /zigman2/quotes/208827848/composite MLM +1.04% eased 0.1%. Elsewhere, U.S. Concrete Inc.'s stock /zigman2/quotes/205491558/composite USCR +1.69% fell 0.9% and Summit Materials Inc. /zigman2/quotes/203159143/composite SUM +0.24% advanced 0.9%. Meanwhile, steel maker shares were also mixed, with U.S. Steel Corp. /zigman2/quotes/200069642/composite X +2.35% down 0.2%, AK Steel Holding Corp. trading flat%, Steel Dynamics Inc. /zigman2/quotes/203426966/composite STLD +1.20% up 0.6% and Nucor Corp. /zigman2/quotes/201889722/composite NUE +0.76% slipping 0.5%.