Durability and Mechanical Properties of Self-compacting Concretes with Combined Use of Aluminium Oxide Nanoparticles and Glass Fiber

Abstract

T he presence of fibers in concrete specimens has an effective role on how the specimens were failed. In this study, the effects of aluminium oxide nanoparticles on the workability, mechanical and, durability properties of SCCs containing glass fibers were investigated. Glass fibers contents of 0, 0.5, 1, and 1.5 % by volume of concrete and aluminium oxide nanoparticles contents of 0, 0.5, 1, 1.5, 2, and 3 % by weight of cement were used. T he properties of fresh concrete were evaluated according to EFNARC consideartions. T he mechanical properties were evaluated by compressive strength, splitting tensile strength, and ultrasonic pulse velocity tests. The durability of the specimens was also measured using water absorption tests, water penetration depth and, electrical resistivity. Combined use of 2% aluminium oxide nanoparticles and 1% glass fiber has increased the compressive and tensile strengths of SCCs by 59% and 119.2%, respectively. Aluminium nanoparticles have a very high specific surface area and their reactivity causes them to react rapidly with calcium hydroxide to produce silicate-hydrate gels. T herefore, calcium hydroxide crystals are reduced and the cavities in the cement gel are filled and the compressive strength is increased. T he use of aluminium oxide nanoparticles along with glass fibers reduces the water absorption rate compared to the sample without these materials. This is one of the effective properties of aluminium oxide nanoparticles, which increases the resistance to adverse environmental factors by reducing water absorption.

Evaluation of the Combined Use of Waste Paper Sludge Ash and Nanomaterials on Mechanical Properties and Durability of High Strength Concretes

“…Nanoparticles have a more effective role in improving the mechanical properties of concrete due to higher filling. Also, the results reported by Faez et al [26] and Heidarzad et al [28] are shown in Figure 7, which used silica nanoparticles and aluminum nanoparticles to make concrete samples, respectively. The purpose of this chart is to ensure the accuracy of the results.…”

“…WPSA in the amount of 0, 5, 10, and 15% by weight of cement, silica nanoparticles at 0 and 2.5% by weight of cement, and aluminum oxide nanoparticles at 0 and 2.5% by weight of cement were used. The reason for choosing 2.5% nanoparticles is that this value has been introduced as the optimal value in many studies [26][27][28]. On the other hand, the main variable studied in the present study is WPSA, and four different values were considered for it.…”

“…The results showed that the combined use of silica nanoparticles and glass fibers significantly affects self-compacting lightweight concrete containing zeolite and scoria aggregates; Depending on the dose of glass fibers and silica nanoparticles, the tensile strength has increased from about 3 to 56% [27]. Heidarzad et al [28] evaluated the effects of aluminum oxide nanoparticles on the performance of concrete containing fibers. The results showed that the addition of aluminum oxide nanoparticles to specimens with and without glass fibers significantly increased the electrical resistance.…”

“…The results showed that the addition of aluminum oxide nanoparticles to specimens with and without glass fibers significantly increased the electrical resistance. Aluminum oxide nanoparticles prevented more ions in the concrete and reduced concrete corrosion by filling small cavities and increasing the concrete density [28]. Mostafa et al [29] evaluated the effect of nano-silica and recycled nanomaterials (nano-glass waste, nano-rice husk ash, and nano-metakaolin) on the properties of highperformance concrete.…”

Retrofitting of RC Beams using Reinforced Self-compacting Concrete Jackets Containing Aluminum Oxide Nanoparticles

“…The results indicated that the use of nanoparticles can increase the tensile strength, flexural strength, and compressive strength of specimens by about 15-19%, 17-25%, and 23-32%, respectively [32]. Heidarzad Moghaddam et al [33] investigated the effects of ANPs on the mechanical and durability properties of fiber SCC. The results showed that the combined use of 2% ANPs and 1% glass fibers increased the compressive and tensile strengths of SCCs by 59 and 119.2%, respectively [33].…”