C reactions are slow, so it is only with time that resistance increases. Such behavior

C reactions are slow, so it is only with time that resistance increases. Such behavior is related towards the formation of calcium silicate hydrate (CSH) resulting from the reaction among calcined kaolin residue and portlandite, i.e., a pozzolanic reaction. As GYKI 52466 MedChemExpress expected, the CSH formation increases the mechanical strength. For remedy times equal to 14 and 28 days, the mortar KR 800 C sample showed slight CS values than the samples measured for the mortar ref. (IPA one hundred ). In the perspective of mechanical strength, this result indicates that the kaolin residue, calcined Sustainability 2021, 13, x FOR PEER Overview 7 of 16 at 800 C, has the potential to replace cement in mortar. All IPA values had been greater than the Compound 48/80 Activator minimum limit of 75 encouraged by ASTM C618 [36].Figure 4. The compressive strength and pozzolanic activity index values for mortar ref. and mortar Figure 4. The compressive strength and pozzolanic activity index values for mortar ref. and mortar KR 800 samples. KR 800 C samples.3.two. Mortar Properties right after Aging in Internal and External environments three.two. Mortar Properties right after Aging in Internal and External Environments Figure 5a shows XRD patterns of mortar KR 800 C aged under internal environFigure 5a shows XRD patterns of mortar KR 800 aged below internal environments (E for 30, 180, and 360 days (Figures 5a ) and external environments (Ee for for ments (Ei)i ) for 30, 180, and 360 days (Figure 5a ) and external environments) (Ee )and 512 days (Figures 5d ). The portlandite (Ca(OH)2, JCPDS 72-0156); ettringite (3CaO.Al2O3.3CaSO4.32H2O, JCPDS 72-0646); calcite (CaCO3, JCPDS 05-0586); and quartz (SiO2, JCPDS 46-1045) were phases identified inside the mortars exposed to the internal and external environment. Nevertheless, the intensity with the portlandite phase peaks decreasedFigure four. The compressive strength and pozzolanic activity index values for mortar ref. and mortar KR 800 samples.Sustainability 2021, 13,3.2. Mortar Properties just after Aging in Internal and External Environments7 ofFigure 5a shows XRD patterns of mortar KR 800 aged beneath internal environments (Ei) for 30, 180, and 360 days (Figures 5a ) and external environments (Ee) for 360 and 512 days (Figures 5d ). The portlandite (Ca(OH)two, JCPDS 72-0156); ettringite 360 and 2O3 days (Figure 5d ). The portlandite (Ca(OH)two JCPDS 05-0586); and quartz (3CaO.Al512.3CaSO4.32H2O, JCPDS 72-0646); calcite (CaCO3, , JCPDS 72-0156); ettringite (3CaO Al2 O46-1045) were phasesJCPDS 72-0646); calcite (CaCO3 , JCPDS 05-0586); and (SiO2, JCPDS three 3CaSO4 32H2 O, identified inside the mortars exposed for the internal and quartz (SiO2 , JCPDS 46-1045) have been phases identified within the mortars exposed to decreased external environment. Having said that, the intensity of your portlandite phase peaksthe internal and time. Such behavior Even so, the intensity of your portlandite phase peaks carbonawith external atmosphere.is strongly related for the pozzolanic reactions and thedecreased withprocess. This indicates that the pozzolanic reaction as well as the carbonation approach, more than tion time. Such behavior is strongly connected for the pozzolanic reactions and also the carbonation procedure. This indicates that the pozzolanic reaction as well as the carbonation process, as time passes, time, have consumed the portlandite. have consumed the portlandite.30 daysM30-Ei E P E P M20-Ei E P M15-Ei E P M10-Ei E P M5-Ei E P E E Q C E Q C C E C E C E Q Q E C Q E C E Q C E Q C E Q E C E Q C C E(a)Q180 daysM30-EiC E C E(b)QM30-Ei360 days P E C P E C.