Effect of Metallic Waste Addition on the Physical and Mechanical Properties of Cement-Based Mortars

Abstract

Featured Application: The development of advance construction materials based on waste valorisation is a reality. The cement-based mortar with recycled metallic waste presented in this study could be potentially used as a building material with crack self-monitoring properties.Abstract: This paper investigates the influence of the type and amount of recycled metallic waste on the physical and mechanical properties of cement-based mortars. The physical and mechanical properties of cement mortars, containing four different amounts of metallic waste (ranged 4 to 16% by cement weight), were evaluated by measuring the bulk density, total porosity, flexural and compressive resistance, and dynamic elastic modulus by ultrasonic tests. All the properties were measured on test specimens under two curing ages: 7 and 28 days. Additionally, the morphological properties and elemental composition of the cement and metallic waste were evaluated by using Scanning Electron Microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS), and X-ray fluorescence (XRF). Main results showed that the addition of metallic waste reduced the bulk density and increased the porosity of the cement-based mortars. Furthermore, it was observed that flexural and compressive strength proportionally increased with the metallic waste addition. Likewise, it was proven that elastic modulus, obtained by compressive and ultrasonic tests, increases with the metallic waste amount. Finally, based on a probability analysis, it was confirmed that the addition of metallic waste did not present a significant effect on the mechanical performance of the cement-based mortars.

Study of three distinct self-compacting concretes containing marble/granite powder and hooked-end steel fiber contents

“…When HESF and coarse aggregates are used, ITZs are created and the elasticity moduli based on static (compressive method) and dynamic (IET method) provide slight different values. This indicates that a correlation between Ed and Es is not provided, as also reported by Norambuena-Contreras et al 44 This suggests that inside the samples, a random fiber distribution is potentially constituted. 44,45 Figure 2(b) shows the correlation evidencing an exponential dependence of the tensile property with compressive strength (expressed by TS ¼ k CS 0.5 ).…”

“…This indicates that a correlation between Ed and Es is not provided, as also reported by Norambuena-Contreras et al 44 This suggests that inside the samples, a random fiber distribution is potentially constituted. 44,45 Figure 2(b) shows the correlation evidencing an exponential dependence of the tensile property with compressive strength (expressed by TS ¼ k CS 0.5 ). Angelin et al, 39 Khatri et al, 46 Ramli and Dawood 47 and Xavier et al 11 have reported similar correlations when rubber, furnace slag/fly ash, flowable high strength mortar and MG contents are utilized, respectively.…”

“…Since a lower amount of samples is required, a lower susceptibility to experimental errors due to the number of variables is provided. 43 Figure 2(a) shows a relation between the dimensionless IET (dynamic method) and compressive (static method) and the elastic moduli of the examined samples, as also carried out by Norambuena-Contreras et al 44 In order to facilitate the comparison between Ed (IET method) and Es (compressive method) results, the moduli are normalized (between 0 and 1), as previously suggested. 44 For this purpose, each one of the modulus is divided by the maximum of each corresponding data series.…”

“…43 Figure 2(a) shows a relation between the dimensionless IET (dynamic method) and compressive (static method) and the elastic moduli of the examined samples, as also carried out by Norambuena-Contreras et al 44 In order to facilitate the comparison between Ed (IET method) and Es (compressive method) results, the moduli are normalized (between 0 and 1), as previously suggested. 44 For this purpose, each one of the modulus is divided by the maximum of each corresponding data series. Although the dynamic and static moduli are physically correlated, 45 depending of the aggregate size and distinct additions (e.g.…”

Study on Interfacial Interaction of Cement-Based Nanocomposite by Molecular Dynamic Analysis and an RVE Approach

“…SEM results indicate the dense formation of SWCNT in cement matrix which will fll up the cement pores and act as a bridge to increase the load carrying capacity of the composite. Te addition of nanomaterials also arrests the formation of cracks and reduces the shrinkage of cracks [3,20]. But the increase of SWCNT concentration leads to agglomeration in the cement matrix at certain places as shown in red color in Figure 3, which will reduce the load capacity and lead to decrease in fexural strength.…”