Permeability Improvement of Fiber-Reinforced Concrete Based on Composite Binder
Abstract
The paper presents a composite binder obtained by co-grinding of cement (55 %), ash acid composition (40 %) and limestone (5 %) having the specific surface area of 550 kg/m2 and 77,3 MPa activity. It is shown that the combined influence of mechanical activation increases the pozzolanic activity of acidic ash and has a catalytic effect on the surface activity of ash and sand. The addition of fly ash and crushing limestone waste into the composite binder decreases water and gas permeability of concrete. The composition of fiber-reinforced concrete based on a composite binder is suggested herein. 1,6 % steel reinforcement with hooked end fiber, the maximum mechanical-and-physical properties can be obtained (100,9 MPa). The obtained concrete provides an effective diffusion coefficient allowing its use in buildings contacting with highly aggressive environments, such as underground engineering structures. Rather a low water absorption of material and low water vapor permeability can be explained by the porous structure of the cement brick.
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Review
For citations:
Fediuk R.S. Permeability Improvement of Fiber-Reinforced Concrete Based on Composite Binder. Vestnik of Tomsk state university of architecture and building. 2016;(2):154-163. (In Russ.)
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