Study on Properties of Wollastonite Micro Fiber Reinforced Mortar

Abstract

The paper carried out comparative studies on the workability, mechanical properties and chloride permeation resistance of wollastonite micro fiber mortar and alkali resistant glass fiber（ARGF） mortar. The results show that the mechanical properties and chloride permeation resistance of wollastonite micro fiber mortar improve significantly. The mechanical properties of wollastonite micro fiber mortar have greater advance in 90°C humidity. The SEM analysis results show that wollastonite micro fiber can form three-dimensional skeleton in the mortar, and combine closely with cement hydration products. This can make the structure of hardened paste denser and lead to excellent properties of mortar. Meanwhile, the compressive strength of wollastonite micro fiber mortar with wollastonite micro fiber content 30%(by mass) is close to ARGF mortar with ARGF content 1.5% (in volume), but the chloride permeation resistance of wollastonite micro fiber mortar is much better.

CO2 Activation of Wollastonite Cementitious Material Based on the Mineralization-Desorption of Potassium Glycine Absorbent

“…Unfortunately, natural wollastonite is mainly composed of β-CS with lower carbonation activity. The dissolution of silicate minerals during the carbonation process is a rate-limiting step, , and many physical and chemical methods can accelerate the dissolution of β-CS, e.g., the use of acidic solvents, mechanical grinding, and high temperature treatments. , However, most of these methods either produce secondary waste or increase energy consumption and carbon footprints. In addition, the carbonation of wollastonite produces mainly calcite and silicate gel.…”

Wollastonite Mineral Fibre in Manufacturing of an Economical Pavement Concrete

“…Concrete possesses sufficient compressive strength but weak in tension which could be overcome by adding suitable metal, mineral or synthetic fibres but the addition of these materials adds to the cost besides requiring specialized handling. A very limited study [Kumar 2015;Soliman and Nehdi 2012;Mathur et al 20007;Norman andBeaudoin 1993, 1994;Xiao et al 2013, Zhang 2013 has shown a great potential for wollastonite mineral micro fibre for these purposes. Wollastonite mineral fibre (WMF) is a calcium inosilicate mineral (CaSiO₃) that may contain small amount of iron, potassium, sodium and magnesium.…”

“…Wollastonite microfibers were reported to act as a local restraint for shrinkage (Soliman and Nehdi 2012). Previous studies [Mathur et al 20007;Norman andBeaudoin 1993, 1994;Xiao et al 2013, Zhang 2013 have shown the potential for using natural wollastonite microfibers as a reinforcing material in cementitious materials. The addition of wollastonite in cement-silica fume matrices showed significant improvements in pre-peak and post-peak load, flexural toughness and ductility.…”