Chloride permeability and impact resistance of polypropylene-fiber-reinforced silica fume concrete

Long-term chloride diffusion in silica fume concrete in harsh marine climates

“…Toutanji [26] cites that the addition of 5% silica fume results in a significant reduction in permeability while the increase of SF content from 5% to 10% had a little effect on the reduction of permeability. According to Detwiler et al [27], most of the benefit in reducing diffusion coefficient occurs with increase in silica fume content from 0% to 6% to 8% by weight of cement and further increases in SF content provide little additional benefit.…”

Mechanical and Durability Performance of Polyacrylonitrile Fiber Reinforced Concrete

“…The greatest impact toughness of the PAN fiber reinforced concrete specimens was gained by incorporating 1.0 vol.% PAN fibers, which obtained the maximum improvement of 250.0%. The introduced PAN fibers absorbed impact energy to prevent specimens from deterioration by the mechanisms of matrix cracking, PAN fiber/matrix interface debonding, PAN fiber pull-out and PAN fiber rupture 14,15 . According to the lastest researches 16,17 , fiber reinforcement can be used to improve both the fatigue and toughness performance of concrete.…”

Study of interfacial microstructure, fracture energy, compressive energy and debonding load of steel fiber-reinforced mortar

“…Silica fume has been reported to have effects in densifying the cement paste due to its smaller particle size to fill the pores and its pozzolanic reaction with CH to form C-S-H [22,23]. However, from the quantitative analysis of the area % of porosity for both w/b, mortars with 10% silica fume show higher area % of porosity than that without silica fume even though the inclusion of 10% silica fume reduces the area % of unhydrated cement compared to that without silica fume.…”

“…Silica fume is commonly used to increase the compressive strength of concrete and mortar [18][19][20] because of its particle size of less than 1 lm and its high content of amorphous silica (SiO 2 ) ([85% in general). These two characteristics allow silica fume to act not only physically as a filler to occupy the void in concrete but also chemically in the pozzolanic reaction with CH to form C-S-H gel that reduces the pores [21] and the permeability [22,23] in the paste, and enhances the bond between the inclusion and the bulk matrix [24]. However, in some cases, the cement replacement of silica fume more than 10% by cement weight reduces the compressive strength of high-strength concrete [20], although the reason for that was not investigated by any means of microstructure analysis.…”