Effect of basalt and polypropylene fibers on crumb rubber mortar with Portland cement and calcium aluminate cement binders: Strength and artificial neural network prediction model

Abstract

This paper aims to study the influence of basalt fiber (BF) and polypropylene fiber (PPF) in crumb rubber (CR) mortar made of two different types of cement, including ordinary Portland cement (OPC) and calcium aluminate cement (CAC). CR was used to partially (5%, 10%, 15%, and 20% by volume) replace the fine aggregate in OPC and CAC mortars. BF and PPF were added (0.1%, 0.3%, and 0.5% by total volume) in the CR mortars. The consistency, density, compressive, and flexural strength of cement mortars were investigated. The use of CAC cement slightly increased the consistency; however, the results showed that the CR replacement and the addition of both fiber types tend to reduce the consistency in OPC and CAC mortars. Significant reduction in the density of fiber-added CR mortar was found with increasing CR content, whereas the influence of both PPF and BF was minimal. The fiber-added CR mortar made of both binder and fiber types in general exhibited a reducing trend in the 28 days compressive strength when increasing CR and fiber contents. Nevertheless, an enhancement in the compressive strength of CAC mortar with 20% CR was found with the addition of 0.1% of both fibers. The use of CR and addition of the fibers generally decreased the flexural strength of mortar made of both binder types; however, the addition of 0.3% BF in mortars containing 15–20% CR positively affected the flexural performance. Finally, the artificial neural network (ANN) approach demonstrated the ability to predict the compressive strength of fiber-added CR mortars. The model showed a considerably insignificant mean square error (MSE) of 1.4–1.5 and high plot regression (R) results of 0.97–0.98.

Optimization of the Impact of Dune Sand, Recycled Rubber Aggregates, and Clay Brick Waste on Eco-Mortar Mechanical Strength by the Taguchi Method

“…Their findings indicate that a suitable substitution level of up to 30% using crumb rubber is deemed acceptable for aggregate replacement. These findings have verified the conclusions of numerous other recent investigations [23,24], which demonstrated that the transition zone between the cementitious matrix and the rubber aggregate is not very compact and has significant porosity. Consequently, these adhesion defects constitute weak points from which cracks can initiate under mechanical stress.…”

Influence of Fibers on Fresh and Mechanical Properties of (FRC) Fiber Reinforced Concrete, A Step Towards Sustainability

“…The versatile quality of natural fibers are better compatibility, good thermosetting, and binding material due to its low density, good thermal insulation properties, improved mechanical properties, low prices, unavailability, easy to approaches, and free disposals, among several features (Baghban et al, 2022;Feng et al, 2022;Latifi et al, 2022;Marcalikova et al, 2020;Ruslan et al, 2022;Su et al, 2022). Although, the fact is that natural fibers have been broadly investigated in terms of their mechanical, thermal and morphological characteristics, like compressive and tensile qualities.…”

Examination of the permeability of rubberized concrete with different water/cement ratios and their resistance against acid and sulfate attack

“…7,8 Today, the aim is to evaluate recycled rubber particles in concrete, with many studies aimed at developing rubberized concrete. [9][10][11][12][13] These rubber particles are used in three classes: chips, crumbs, and powder rubber. 14 Waste rubbers can be commercialized and used in asphalt, plaster, mortar, and concrete.…”