Experimental Investigation of the Effect of Micro-Silica and Zeolite on Repair Mortar of Concrete Pavements

Abstract

In the recent years, by replacing a part of our country's asphalt pavements with concrete pavements, it is necessary to perform appropriate actions in order to preserve and repair destructions (due to executive weaknesses, loading and environmental conditions) during pavement lifetime. In order to increase mechanical properties and durability of repair mortars, micro-silica and zeolite were used as pozzolan, polypropylene fibers for controlling crack (due to fluctuations in concrete and temperature change) and the cement type 3 for obtaining high resistivity in short-term. In this study, 11mixing designs were investigated, and the composition of polypropylene fibers with micro-scale thickness with cement complements can be considered as the most optimal mixing design in 0.2% of fibers with 10% micro-silica and 15% zeolite in order to promote effective parameters of elasticity modulus, modulus of rupture and decrease of contraction in repair mortars of concrete pavements. By adding polypropylene fibers, the samples were not completely ruptured in the tension of primary strength that they showed. The samples containing 0.4% fibers with deformation from spherical state to elliptical state with splay value in rupture surface showed individual characteristic which caused minimizing rupture and crunch in the repaired area.

Effect of micro silica on fiber-reinforced self-compacting composites containing ceramic waste

“…42 Another reason is that MS particles prevent the growth of crystals, such as Ca (OH) 2 among the hydrated products. 43 The third reason is that micro silica particles fill cement cavities that increase strength. Moreover, MS increased the density of hydrated silicates in the cement paste, which resulted in higher compressive strength.…”

Using Waste Vermiculite and Dolomite as Eco-Friendly Additives for Improving the Performance of Porous Concrete

“…In recent years, many researches have been done for improving the structural performance of concrete [6]. Chindaprasirt et al (2006) investigated the effect of using various levels of cement on the compressive strength of porous concrete [7]. According to their report, adding superplasticizer and reducing the water/cement ratio culminated in a significantly increases of the compressive strength.…”