The flexural behaviors and mechanism of wollastonite microfiber modified ultra-high performance concrete with steel fiber from micro to macro scale

Zeng, Deming; Cao, Mingcui

doi:10.1007/s43452-021-00340-1

Cited by 5 publications

(1 citation statement)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the brittleness of alkali-activated concrete is higher than Portland cement concrete. The application of steel fibre [33][34][35][36][37], polypropylene fibre [38][39][40], polyvinyl alcohol fibre (PVAF) [41][42][43][44] and hybrid fibres [8,[45][46][47][48][49][50][51][52][53][54][55][56][57] in cement-based materials and alkali-activated materials are the most widely studied topic [58,59]. Among them, PVAF has become one of the most widely used fibre in cementbased materials and alkali-activated materials due to its significant advantages of low cost, high chemical stability and easy construction [43,[60][61][62].…”

Section: Introductionmentioning

confidence: 99%

Characteristic of Fresh and Harden Properties of Polyvinyl Alcohol Fibre Reinforced Alkali Activated Composite

Wang¹,

Zhang²,

Zhang³

2023

Journal of Renewable Materials

View full text Add to dashboard Cite

Fibre can enhance the mechanical properties of cement-based composites, but fibre also degrades their workability. However, the quantitative effects of fiber content and length-diameter ratio on alkali-activated materials are still unclear. Various aspect ratio, volume fraction of polyvinyl alcohol fibre (PVAF), and various water-binder ratio were employed to prepare a total of 26 groups of fibre reinforced alkali-activated composite (FRAAC). The influence of PVAF fibre factor (product of fiber volume fraction and length-diameter ratio) on flowability, compactness, strength, and crack fractal dimension of FRAAC was researched. The influence of water-binder ratio on the plastic viscosity of FRAAC was more significant than that on the yield stress. When fibre factor was lower than critical value of 150, the influence of fibres could be overlooked. The reason was that the space between fibres was distant, so the flowability of FRAAC was not impacted by PVAF. At this time, fibres were challenging to restrict the cracks in matrix and increase their mechanical properties. When fibre factor was higher than critical value 150 and lower than density packing value 450, the flexural strength, compressive strength and crack fractal dimension of FRAAC were considerably enhanced, and the FRAAC could still flow easily under dead weight. When fibre factor were above 450, noteworthy fibre balling considerably decreased the flowability, leading to poor solidity and reduced compressive strength. Hence, the ideal content of PVAF in alkali activated composite is between 150/(l/d) and 450/(l/d).

show abstract

Section: Introductionmentioning

confidence: 99%

Characteristic of Fresh and Harden Properties of Polyvinyl Alcohol Fibre Reinforced Alkali Activated Composite

Wang¹,

Zhang²,

Zhang³

2023

Journal of Renewable Materials

View full text Add to dashboard Cite

show abstract

Mitigating autogenic shrinkage in high‐performance concrete using wollastonite: A structural enhancement approach

Aziza,

Li,

Huang

et al. 2024

Structural Concrete

View full text Add to dashboard Cite

This study investigates the influence of wollastonite fiber as a reinforcement in high‐performance concrete (HPC), focusing on its potential to mitigate autogenic shrinkage and enhance overall structural properties. HPC known for its superior strength and low permeability, often suffers from intensified autogenic shrinkage, leading to micro‐cracking and compromising durability. To address this challenge, wollastonite was incorporated at different substitutions (0%, 5%, 10%, and 15%) for both cement and aggregate. The experimental program involved a systematic evaluation of compressive strength, flexural strength, porosity, water absorption, and corrosion resistance with tests conducted at different curing periods. We found that the addition of 10% wollastonite significantly enhances compressive strength (up to 20% after 90 days) and flexural strength (maximum improvement of 21%). The water permeability was decreased by 29% and improved resistance to steel reinforcement corrosion, demonstrating enhanced durability compared to conventional HPC. However, diminishing returns were observed at higher wollastonite replacement levels (15%), indicating a threshold beyond which mechanical and durability benefits were reduced due to potential issues with fiber dispersion and workability. Our findings suggest that wollastonite is a promising, cost‐effective additive for improving HPC. The study contributes new understandings into optimizing HPC mixtures for greater durability and sustainability, while also reducing the environmental footprint through partial cement replacement. Future research is needed to explore the long‐term performance of wollastonite‐reinforced HPC under different environmental conditions and its combination with other supplementary cementitious materials for further enhancement.

show abstract

Multiscale ab-initio modeling and experiment of nano-CaCO3 and fiber synergy on toughening low-carbon geopolymer composites

Li,

Ma,

Ming

2023

Materials & Design

View full text Add to dashboard Cite

The flexural behaviors and mechanism of wollastonite microfiber modified ultra-high performance concrete with steel fiber from micro to macro scale

Cited by 5 publications

References 25 publications

Characteristic of Fresh and Harden Properties of Polyvinyl Alcohol Fibre Reinforced Alkali Activated Composite

Characteristic of Fresh and Harden Properties of Polyvinyl Alcohol Fibre Reinforced Alkali Activated Composite

Mitigating autogenic shrinkage in high‐performance concrete using wollastonite: A structural enhancement approach

Multiscale ab-initio modeling and experiment of nano-CaCO3 and fiber synergy on toughening low-carbon geopolymer composites

Contact Info

Product

Resources

About