Lorenzo H. Zambrano, who turned his family-owned cement company, NRMCA Associate member CEMEX, into a giant spanning five continents, and who exemplified a generation of Mexican business leaders as they embraced globalization, died last week in Madrid. He was 70. The company said he died of natural causes while on a business trip but provided no other details. Beginning in 1992, Mr. Zambrano bought up far-flung producers to create the third-largest cement company in the world. He remade each new acquisition, introducing high technology and logistical efficiencies that made CEMEX the subject of business school case studies at Harvard and the Massachusetts Institute of Technology.