Title: Interface Properties Between Reactive Magnesia Cement Matrix and GFRP Rebar

Author(s): Wu and Jishen Qiu

Publication: Symposium Paper

Volume: 362

Issue:

Appears on pages(s): 1-17

Keywords: glass fiber reinforced polymer (GFRP), reactive magnesia cement (RMC), bondslip behavior, non-uniform carbonation, CO₂ sequestration

DOI: 10.14359/51740871

Date: 6/5/2024

Abstract:
Reactive magnesia cement (RMC) is an emerging class of low-alkaline and CO₂-sequestering binder, which can mitigate the deterioration of GFRP reinforcements induced by a high alkaline environment, e.g., in Portland cement. This study investigated the slip behavior of GFRP rebar embedded in RMC composite, which varies with carbonation depth significantly. The variation of the interfacial bond was determined by a specially designed push-out test of the GFRP core; the variation of the carbonation degree and microstructure was examined by SEM-EDX, XRD, TGA, and acid digestion tests. Both properties demonstrated a similar trend, decreasing rapidly with increasing depth. A new finite element model that considers the depth-dependency of the matrix compositions and the rebar-to-matrix interfacial bond is established. It can predict the constitutive bond-slip behavior of a long GFRP rebar embedded in an RMC composite with non-uniform carbonation.