Cement-based composite restraint concrete compound column and manufacture method thereof

The invention discloses a cement-based composite restraint concrete compound column comprising a concrete inner core. The concrete inner core is peripherally wrapped with a cement-based composite layer, and the cement-based composite layer comprises cement, sand and/or mineral admixtures, water, steel fibers and PVA (polyvinyl acetate) fibers. The invention further provides a manufacture method of the cement-based composite restraint concrete compound column. The method includes the following steps: A, making a mould or setting up a formwork for pouring the concrete inner core, and demolishing the mould after the concrete inner core is solidified; B, setting up a cement-based composite layer mould on the periphery of the concrete inner core; C, injecting cement-based composite into an inner cavity between the concrete inner core and the mould; D, after the cement-based composite layer is solidified and dried, demolishing the outer-layer formwork or mould. The cement-based composite on the outer layer of the cement-based composite restraint concrete compound column can replace traditional reinforcement, so that overall bending strength and tensile strength of the compound column can be enhanced, and ultimate tensile strain can be up to 0.7% maximally.