Investigating the properties of roller-compacted rubberized concrete modified with nanosilica using response surface methodology

Abstract

Globally there is continuous rapid production of waste tires due to an increase in vehicle usage, which is becoming a serious environmental issue as its disposal and reuse affect sustainability negatively. With concrete being the most commonly available man-made construction material, there is a serious concern over the sustainability of natural resources mostly aggregate. One of the ways to address problems related to waste tire disposal and sustainability of natural material is by incorporating the waste tires in concrete production. In this paper, the effect of crumb rubber (CR) particles partially replacing the natural sand at 0 to 30% interval of 10%, modified with nanosilica (NS) added at 0%, 2% and 3% by weight of cement in roller-compacted concrete (RCC) was investigated. Moreover, response surface methodology (RSM) was employed to develop a model for predicting fresh density, Vebe time and compressive strengths. The result showed that 2%NS is effective in mitigating strength loss in concrete containing crumb rubber up to 10%. The addition of 2% NS to RCC with 10% CR improved its strength by 10.3%, 12.7% and 27.4% at 3 days, 7 days and 28 days, respectively. The RSM models developed were significant, and there is a good correlation between the observed values and the predicted variables. Finally, the 28-day compressive strength of RCC incorporated with CR and NS was predicted based on its 3-day and 7-day compressive strengths.

Experimental and Statistical Analysis of U-Shaped Polyurethane-Based Polymer Concrete under Static and Impact Loads as a Repair Material

“…The past studies revealed that the two-parameter Weibull distribution appeared to be more fitting and established distribution functions for determining concrete's dynamic and fatigue properties [56,57]. Similarly, a strong technique namely response surface methodology have been used to evaluate the concrete performance [58][59][60], such as statistical analysis, prediction, and optimization. Therefore, the Weibull distribution function demonstrates an ascending or descending hazard function that reflects the actual concrete structure's performance [61].…”

Assessment of Special Rubberized Concrete Types Utilizing Portable Non-Destructive Tests

“…For the trending concrete types such as SCC and RCC, the crumb rubber has revealed different guides on whether to replace coarse or fine aggregate for better strength performance of the concrete. Table 1 and Table 2 [65][66][67][68][69][70][71][72][73][74] were generated by summing up collected data from the existing literature review showing the replacement of fine, coarse, and combined aggregate with crumb rubber in SCC [39] and RCC. Most researchers agree that replacing the rubber with fine aggregate in the case of SCC would be more beneficial than the coarse or total aggregate.…”

“…Other researchers [54,60,61] concluded that the total aggregate replacement with crumb rubber would perform better by lowering the strength reduction that occurs when adding crumb rubber to the concrete mix, as in the case of fine or coarse aggregate replacement. Similarly, in RCC, most of the researchers [65][66][67][68][69][70][71][72][73][74] studied the replacement of fine aggregate or combined (total aggregate). Most investigations have explored the utilization of crumb rubber as fine aggregate replacement.…”

Prediction of Mechanical Properties of Rubberized Concrete Incorporating Fly Ash and Nano Silica by Artificial Neural Network Technique

“…[1][2][3]. In addition, various admixtures modified both fresh and hardeening properties of concrete which include crumb rubber (CR) [4,5] nanomaterials [6][7][8][9], polymer materials [10][11][12], fiber-reinforcement [13][14][15][16][17], and pozzolonic materials [18][19][20].…”