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AssigneeALLNEW Chemical Technology Company
InventorsMaw-Tien Lee, Zih-Yao Shen, Chi-Yao Chen, Fu-Ming Lee, John Lee
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A hydrophobic admixture, for cementitious materials such as cement paste, mortar, and concrete, includes solid polymer particles with a coating of hydrophobic agent and surfactant. The solid polymer particles adhere to exterior surfaces of hydrated cement particles in the cement matrix. The solid polymer particles deliver the hydrophobic agent into the cement matrix which is hydrophilic. The hydrophobic agents are distributed uniformly throughout the cement matrix. The solid polymer particles can be crumb rubber particles derived from waste rubber tires, recycled plastics and similar solid materials. The hydrophobic liquid agent is derived from waste lubricant oil, spent motor oil, base oil, esters of fatty acids, vegetable oil and the like. Fine particles such as activated carbon, silica fume and spent catalyst can be employed to fill the large pores or cracks that develop in the cementitious matrix. The cured cementitious materials exhibit high contact angles and high compressive strengths.
A set cementitious composition, that comprises cement paste, mortar, or concrete, and which comprises a cement mixture with hydrated cement particles dispersed therein and which comprises solid polymer particles that have a surface coating comprising (i) a hydrophobic agent, wherein the solid polymer particles adhere to exterior surfaces of the hydrated cement particles, (ii) a surfactant that is blended with the hydrophobic agent and (iii) fine particles that are selected from the group consisting of activated carbon, silica fume, spent catalyst, and mixtures thereof and that fill pores or cracks in the composition.
A method of preparing a cementitious composition which comprises (a) forming a cement mixture by mixing dry cement, water, and a hydrophobic admixture which comprises solid polymer particles that have a surface coating comprising (i) a hydrophobic agent whereby the solid polymer particles adhere to exterior surfaces of hydrated cement particles that develop in the cement mixture, (ii) a surfactant that is blended with the hydrophobic agent and (iii) fine particles;
Dependencies are inferred from the claim text.