Performance‐enhancement of high‐strength strain‐hardening cementitious composite by nano‐particles: Mechanism and property characterization

Abstract

Nano-SiO 2 (NS), due to its prominent nucleation and pozzolanic effects, holds the promise to effectively enhance the tensile and compressive properties of highstrength strain-hardening cementitious composite (HS-SHCC) at both early age (1d, 3d) and normal curing age (28d). The influence of nano-SiO 2 (NS) on the hydration, microstructure and mechanical properties of HS-SHCC with different dosages (i.e., 0%, 1%, 2%, and 3% by mass of cement) were explored in this research. The nucleation effect of NS particles accelerated the hydration process, Ultra-high performance concrete (UHPC) with extremely low water-to-binder ratio has attracted increasing attention because of its high compressive strength and excellent durability. 1 Nonetheless, it is still challenging for UHPC to Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

Bond behavior of plain round bar embedded in high ductile concrete under monotonic and cyclic loading

“…High ductile concrete (HDC) is a new building material which belongs to a kind of high performance fiber reinforced cementitious composites (HPFRCC) 1,2 and also called as engineered cementitious composites (ECC). 3,4 HDC exhibits a pseudo strain hardening behavior with multiple fine cracks when subjected to tensile loading.…”

Nanofibrillated celluloses for the performance improvement of ultra-high ductility cementitious composites

“…In recent years, applying nanomaterials to cementbased composites has increasingly been a popular topic, and nanotechnology could modify the properties of cement-based composites, and also reduce CO2 emission and raw materials. Adding various types of nanomaterials, such as multi-walled carbon nanotubes (MWCNTs) (Xu et al 2019), graphene oxide (GO) (Lu et al 2016), nano-SiO2 (NS) (Li et al 2016;Xi et al 2020;Ding et al 2021;Zhou et al 2021), and nano-CaCO3 (NC) (Ding et al 2020), has been proved to be an effective method for improving the properties of ECC. These nanomaterials could act as nucleation sites and thus accelerate the hydration of cement particles, which would provide more hydration products, and fill the pores.…”