Combined Effects of Metakaolin and Hybrid Fibers on Self-Compacting Concrete

Abstract

There is a need to develop new construction materials with improved mechanical performance and durability that are low-priced and have environmental benefits at the same time. This paper focuses on the rheological, mechanical, morphological, and durability properties of synthetic and steel fiber reinforced self-compacting concrete (SCC) containing 5–15% metakaolin (M) by mass as a green replacement for Portland cement. Testing of the fresh mixes included a slump-flow test, density, and porosity tests. Mechanical properties were determined through compression and flexural strength. A rapid chloride penetrability test (RCPT) and the chloride migration coefficient were used to assess the durability of the samples. A scanning electron microscope (SEM) with energy dispersion spectrometry (EDS) was used to study the concrete microstructure and the interfacial transition zone (ITZ). The results show that a combination of metakaolin and hybrid fibers has a negative effect on the flowability of SCC. In contrast, the inclusion of M and hybrid fibers has a positive effect on the compressive and flexural strength of SCC. The fracture of SCC samples without fibers was brittle and sudden, unlike the fiber-reinforced SCC samples, which could still transfer a considerable load with increasing crack mouth opening deflection. Overall, the chloride migration coefficients were reduced by up to 71% compared to the control mix. The chloride reduction is consistent with the resulting compact concrete microstructure, which exhibits a strong bond between fibers and the concrete matrix.

Carbonization of Class G Well Cement Containing Metakaolin Under Supercritical and Saturated Environments

“…As a pozzolanic admixture of high activity, MK, Al 2 Si 2 O 7 , already plays an important role in concrete infrastructure construction. Due to the high concentration of silica and aluminum, it is very reactive with Ca(OH) 2 , and develops additional C-S-H gel, thus leading to an improved microstructure and durability [17]. Chang et al [18] determined the impact of carbonization in the phase evaluation of 42.5 Portland cement paste blended with MK at 393 K with a volume fraction of CO 2 70% and 20% at 0.01 MPa.…”