Properties of Fibre-Reinforced High-Strength Concrete with Nano-Silica and Silica Fume

Abstract

This study intends to assess the influence of steel fibres (SF) and polypropylene fibres (PPF) on the hardened and fresh state properties of high-strength concrete (HSC). For this purpose, 99 concrete mixes were designed and applied. SF and PPF were used at six-volume replacement contents of 0%, 0.1%, 0.2%, 0.3%, 0.4% and 0.5%. Moreover, nano-silica (NS) was used at three contents, 0%, 1% and 2%, and silica fume powder (SP) was also used at three weight ratios (0%, 5% and 10%). The slump, compressive and tensile strength, elasticity modulus, water absorption and the electric resistivity of concrete specimens were examined. The results showed that using 1% NS and 10% SP together with 0.5% PPF improved the compressive strength of HSC by about 123%; however, the effect of SF on tensile strength is more significant and adding 0.5% SF with both 2% NS and 10% SP increased the tensile strength by 104%. Moreover, increasing the SF content reduces the electric resistivity while using PPF improves this property especially when 1% NS was employed, and it was enhanced by about 68% when 0.5% SF and 1% NS were utilized with 10% SP.

Enhanced Eco-Friendly Concrete Nano-Change with Eggshell Powder

“…There are several works devoted primarily to solving environmental and economic problems through the disposal of various types of waste by using them in building materials [3,5,[12][13][14][15][16]19,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. In addition, there are works related to the improvement of the properties of composite building materials, products, structures, and first, concretes due to their nano-modification [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55].…”

A Study on the Cement Gel Formation Process during the Creation of Nanomodified High-Performance Concrete Based on Nanosilica

“…Modification with microsilica is currently very popular due to its effectiveness in improving the properties of concrete both separately and in combination with other additives [ 15 , 19 , 26 , 27 , 28 , 39 , 40 , 41 , 42 , 43 ]. The most effective dosages of microsilica vary from 5 to 20%, depending on the raw materials used and the types of concrete.…”

“…The most effective dosages of microsilica vary from 5 to 20%, depending on the raw materials used and the types of concrete. At the same time, the increase in strength characteristics varies from insignificant, when only microsilica is added, to quite impressive (30–80%), when other additives are used along with microsilica, in particular, flask and diatomite [ 27 ], fly ash [ 19 ], carbon nanotubes [ 26 ], nanosilica, and nanosilica sol [ 19 , 41 , 43 , 44 ]. Microsilica densifies and strengthens the structure, increasing its uniformity and stabilizing the cement hydration process [ 19 , 27 , 40 , 41 , 42 , 43 , 44 ].…”

“…The nano-modification of concrete with nanosilica [ 12 , 13 , 18 , 19 , 23 , 24 , 25 , 35 , 41 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ] has already shown efficiency in improving the properties of concrete, but still requires a solution for many issues. The main problem associated with the introduction of nanoparticles into cement-based materials is how to evenly distribute them in the matrix [ 23 ].…”

Fracture Properties of Recycled Concrete Reinforced with Nanosilica and Steel Fibers

“…When the SF are evenly scattered in concrete, they can restrict crack development through the bridging e ect, enhance the performance of the concrete interface transition zones (ITZ), and improve the mechanical properties of concrete [10]. SF increase the density of concrete, enhance wear resistance, water penetration resistance, corrosion resistance [11,12], and reduce the chloride ion permeability and resistivity of concrete [13]. Furthermore, they inhibit the development of cracks and can enhance the crack resistance and shrinkage limiting capacity of concrete.…”