This study establishes the chemical properties of blended cement pastes to understand the effect of marble and brick powders on cement chemical properties. Thus, this paper extends knowledge of construction material handling and practices. Marble and brick powder and CEM I 42.5N cement clinker have been used as materials in this work. Blended cements have been prepared with the addition of CEM I 42.5N cement clinker for marble or brick powder at the ratios of 6, 20, 21, and 35%. CEMI 42.5N cement has been used as reference cement. A total of 24 cement paste samples were mixed with blended cements and reference cements according to the Turkish standard EN 196-1, and they waited in water for 7, 28, and 90 days. The chemical properties of blended and reference cement pastes were determined through the Turkish standard EN 196-2, known as wet analysis, at the 7th, 28th, and 90th days of the curing period after they were dried and ground in the laboratory. The results show that the chemical properties of cement pastes could be enhanced with the industrial wastes that have been stored on agricultural land instead. DOI: 10.1061/(ASCE) CO.1943-7862.0000378. (C) 2011 American Society of Civil Engineers.