Performance evaluation of high-performance self-compacting concrete with waste glass aggregate and metakaolin

Relationships between Mortar Spread and the Fresh Properties of SCC Containing Local Metakaolin

“…A good relationship between the filling capacity of the SCCs, evaluated by the slump flow test and the fluidity of their related mortar portion, has been observed [14]. In this context, the form and nature of the relationships that may exist between the fresh state properties of SCCs containing MK and its mortar were investigated.…”

“…The metakaolin (MK) used in this investigation was obtained from a local kaolin that was thermally activated at a temperature of 850 • C for 3 h. The MK obtained had a density of 2.6 g/cm 3 and a BET surface area of around 140,000 cm 2 /g. The chemical compositions of the PLC cement and the MK used are reported elsewhere [14]. An ether polycarboxylate superplasticizer (SP), with a density of 1.07 g/cm 3 , was used.…”

“…This relationship depended, in particular, on the dosage of the SP and the MK content in the mix. To obtain the relationships between mortar spread and the fresh properties of the SCC with the local metakaolin, the SCC mixtures were classified into two categories, according to the diameter of spread of the mortar [14]. Figure 2 suggests that the SCC mixtures can be classified into two categories of SCM: Category A, corresponding to a spread in the SCM of less than 300 mm, such as that of 5MK, 15MK, and 25MK, and Category B, with a spread in the SCM greater than or equal to 300 mm, such as that of PLC, 10MK, and 20MK.…”

“…Because of the high specific surface area and the tendency of MK to agglomerate, both the plastic viscosity and yield stress of the concrete are reduced when both cement and MK are used [13]. However, the use of MK in limestone cement resulted in a reduction in the yield stress and an increase in the plastic viscosity [14] or an increase in both rheological properties [15]. The use of MK in SCC provides adequate flowability, passing ability, and viscosity by limiting the risks of bleeding and segregation [15].…”

“…The main objective of this study was to investigate the validity of these correlations when using metakaolin. This paper presents some results of an extensive study on SCC [14], which aimed to extend the knowledge of the relationships between the fresh properties of SCC containing metakaolin (MK) and the spread of its related mortar portion. For this purpose, different percentages of a locally produced MK were used as partial substitutions of Portland limestone cement (PLC), in order to study the rheological behavior and the correlation between the various properties.…”