Abstract
This study investigated fundamental mechanical properties of a basalt fiber reinforced engineered cementitious composite (BF-ECC) with different volume fractions of basalt fiber (BF), water–binder ratio (W/B) and fly ash (FA) content. The compressive strength, splitting tensile strength, flexural strength and static modulus of BF-ECC were studied at 3, 28 and 56 days, respectively, to explore their development along the ages. Furthermore, the scanning electron microscopy (SEM) analysis was conducted to evaluate the microstructure of BF-ECC. Experiment results demonstrated that bond quality between the BF and the matrix is good, which leads to a significant increase in the flexural strength and splitting tensile strength. The pozzolanic effect of FA obviously improved the splitting tensile and flexural strength of BF-ECC after 56 days of curing, and the appropriate content of the FA content in the BF-ECC ranges from 50% to 60%.
Highlights
Engineered cementitious composite (ECC) is a cement-based material consisting of cement, fly ash (FA), sand, water, a chemical admixture and short discrete fibers [1]
The influence of basalt fiber (BF) on concrete was revealed by Wang et al [21], the results showed that the compressive strength, splitting tensile strength and flexural strength are effectively enhanced with the increase of BF (0.1%, 0.15% and 0.2%)
This study examined fundamental mechanical properties of basalt fiber reinforced engineered cementitious composite (BF-ECC) through a series of experiments and scanning electron microscopy (SEM)
Summary
Engineered cementitious composite (ECC) is a cement-based material consisting of cement, fly ash (FA), sand, water, a chemical admixture and short discrete fibers [1]. ECC is known for its enhanced tensile ductility, with the tension strain ranging from 3% to 8% and the width of multi-cracks usually being less than 200 μm [2,3,4]. Due to these special advantages, ECC is widely used, especially in structures that require an enhanced tensile capacity, such as retaining walls, dams, aqueducts, bridge decks and building dampers [5]. Various types of fibers have been used in ECC, such as polyethylene (PE), polypropylene (PP) and polyvinyl alcohol (PVA) fibers. PP, PE and PVA fibers are all organic polymer fibers, so they have the common disadvantage of poor high temperature resistance
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