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OwnerMaw-Tien Lee, Zih-Yao Shen +3inventors
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.
An admixture composition, for improving the hydrophobicity of a cementitious material that comprises a cement mixture with hydrated cement particles dispersed therein, which comprises solid polymer particles that have a surface coating comprising a blend of a surfactant and a hydrophobic agent which is selected from the group consisting of waste lubricant oil, spent motor oil, base oil, ester of fatty acids, vegetable oil, and mixtures thereof, wherein the solid polymer particles adhere to exterior surfaces of the hydrated cement particles, and fine particles that are selected from the group consisting of activated carbon, silica fume, spent catalyst, and mixtures thereof.
An admixture composition, for improving the hydrophobicity of a cementitious material that comprises a cement mixture with hydrated cement particles dispersed therein, which comprises solid polymer particles that have a surface coating comprising a hydrophobic agent, wherein the solid polymer particles adhere to exterior surfaces of the hydrated cement particles, and fine particles that are selected from the group consisting of activated carbon, silica fume, spent catalyst, and mixtures thereof.
Dependencies are inferred from the claim text.