Investigation of Fibers Reinforced Engineered Cementitious Composites Properties Using Quartz Powder

Abstract

In relation to the use of retrofit materials on damaged constructions, application on earthquake-resistant buildings, and for the strengthening and rehabilitation on weakened regions, there is a need for a more superior material than concrete. Application sites include beam-column joints, corbels, link-slabs, deep beams, support regions and dapped-end areas. Fiber reinforced engineered cementitious composites (FR-ECC) can address this issue, because FR-ECC is one of the composite materials that has high strength, ductility and durability. In order to develop FR-ECC, this study was done to investigate the effect of adding quartz powder on the compressive strength capacity and properties of FR-ECC through the use of polyvinyl alcohol (PVA) and steel fibers. The volume fraction of fiber was set to 0%–2%. To support the friendly environment, FR-ECC uses by-product materials such as fly ash and silica fume, with a cement content less than 600 kg/m3. In terms of the experimental investigation on FR-ECC, this work conducted the fresh property tests showing that PVA fibers have quite an influence on ECC workability, due to their hydrophilic behavior. By adjusting the superplasticizer (SP) content, the consistency and high workability of the ECC mixes have been achieved and maintained. The test results indicated that the PVA and steel fibers-based ECC mixes can be classified as self-compacting composites and high early compressive strength composites. Significantly, addition of quartz powder into the ECC mixes increased the compressive strength ratio of the ECC samples up to 1.0747. Furthermore, the steel fiber-based ECC samples exhibited greater compressive strength than the PVA fibers-based ECC samples with the strength ratio of 1.1760. Due to effect of the pozzolanic reaction, the fibers dispersion and orientation in the fresh ECC mixes, so that the cementitious matrices provided the high strength on the FR-ECC samples. During the compression loading, the bulging effect always occurred before the failures of the fibers-based ECC samples. No spalling occurred at the time of rupture and the collapse occurred slowly. Thus, FR-ECC has provided unique characteristics, which will reduce the high cost of maintenance.

Modification of Iron-Tailings Concrete with Biochar and Basalt Fiber for Sustainability

“…At 28 days, the corrosion coefficient of UCS of samples PFB21 and PFB22 is maintained at about 0.97, which has no obvious difference from the strength of unsoaked concrete. With the increase of basalt fiber content, the erosion coefficient of UCS of the PFB group shows a smooth state or slightly increases; this indicates that, with the increase of fiber content, the improvement of sulfate attack resistance of the PFB group is small, and the deterioration effect is not obvious; this is similar to the results of Liew et al [36]. In the control group, the corrosion coefficient of UCS of C1 and C2 concrete at 7 or 28 days is between 0.75-0.8, which is significantly lower than that of unsoaked concrete; however, the corrosion resistance coefficient of UCS of the PFB group is between 0.8-0.97, which is about 5-15% higher than that of the control group; this indicates that the addition of basalt fiber and biochar can effectively resist sulfate attack.…”

“…At 28 days, the corrosion coefficient of UCS of samples PFB21 and PFB22 is maintained at about 0.97, which has no obvious difference from the strength of unsoaked concrete. With the increase of basalt fiber content, the erosion coefficient of UCS of the PFB group shows a smooth state or slightly increases; this indicates that, with the increase of fiber content, the improvement of sulfate attack resistance of the PFB group is small, and the deterioration effect is not obvious; this is similar to the results of Liew et al [36].…”

Structural behaviour of the strengthened reinforced concrete beams using ultra high-performance fibre reinforced concrete layer

“…Studies related to the use of UHPFRC layers as a strengthening material have been also reported by others (Prem et al , 2015; Zhang et al , 2020; Paschalis and Lampropoulos, 2021; Zhu et al , 2020). Furthermore, many researchers have carried out investigations into the mechanical properties, behaviour and durability of UHPFRC (Abbas et al , 2015; Alkaysi et al , 2016; Spiesz and Hunger, 2017; Tayeh et al , 2012; Wille et al , 2014; Zhang et al , 2020; Liew et al , 2020). This will certainly provide invaluable information for the construction sector related to the use of UHPFRC as strengthening or rehabilitation materials on damaged-RC elements.…”

Study on Early Compressive Strength of Mortar- and Crumb Rubber-Engineered Cementitious Composites Contain Variation of Cement, Palm Shell Ash and River Sand

“…In order to make later ECC more cost-effective in terms of building expenditures by enabling it to be cast and mixed like concrete generally [4,5]. On the other hand, the addition of nanomaterials such graphene oxide [6][7][8], quartz powder [9] and nano-silica [3,10,11] is a form of modification in the development of ECC.…”