| abstract |
A method for preparing a concrete composition having improved properties is provided, the method including the steps of combining portland cement and one or more aggregates to form a cement pre-mix; combining a boron-containing compound, a silicon-containing compound other than sand, a surfactant, and water to form an additive pre-mix; mixing the cement pre-mix, the additive pre-mix, and water to form a saturated cement mixture; placing the saturated cement mixture in a form; compacting the saturated cement mixture; and curing the saturated cement mixture to form a concrete composition. In alternative embodiments, an organic acid and/or an encapsulated acid may be employed. |