###### Abstract
[25], a foamed matrix was prepared using EGA and the mechanical, thermal and frost resistance properties were examined. They obtained the compressive of 4.7 and 5.7 MPa at the age of 7 and 28 days and the thermal conductivity of 0.152-0.108 W/m.K. Moreover, it was observed that reference samples had lower values of weight loss (g/m\({}^{2}\)) after the freeze-thaw test comparing to compositions with EGA. They also characterized the microstructure of the prepared foam matrix using optical microscopy and observed that EGA were distributed uniformly over the cross-section without any processes of segregation. [PERSON] et al. [16] fabricated EGA-cement mortar and reported crushing resistance of 1.9-2.9 N/mm\({}^{2}\) and water absorption of 13.6-15.8 wt% depending on the particle size. The results showed a compressive strength of about 6 MPa and thermal conductivity less than 0.14 W/m.K. In the study conducted by [26], the influence of the grain size and percentage of EGA content on physical and mechanical properties of the cement composite were investigated. They reported an average porosity of 45-67% and bulk density of 903-1078 kg/m\({}^{3}\) in specimens containing 100% EGA with the size of 2-4 mm. Moreover, the compressive strengths of 6.68-12.49 MPa obtained for EGA cement mortar. In another attempt, [27] investigated the possibility of using artificial neural networks to design the composition of cement composite containing EGA with the desired properties. They established the relation between the quantity of EGA and the porosity, bulk density, and compressive strength of a cement composite. Moreover, previous studies revealed that high glass content (above 50%) could considerably increase the water absorption of cementitious composites [28; 29]. It can be concluded that incorporation of EGA in cement mortar can significantly reduce the mechanical properties such as compressive strength and water resistance of cement matrix. Hence, in order to compensate the reduction in mechanical strength and water absorption of cementitious composites integrated with EGA, nanofillers such as TiO\({}_{2}\) can be used. Previous researches have demonstrated that the addition of TiO\({}_{2}\) nanoparticles effectively enhanced the compressive strength and reduce the water absorption of cementitious composites [30; 31; 32; 33; 34; 35]. Indeed, nTiO\({}_{2}\) fills the nanovoids in concrete, which leads to the increment of compressive strength up to 40% [34; 36]. Moreover, TiO\({}_{2}\) accelerates the formation of C-S-H gel by increasing the amount of crystalline Ca(OH)\({}_{2}\) at the early age of hydration [32; 37]. [PERSON] et al. [32] reported 37% and 44% increase in tensile and flexural strength respectively for the samples containing TiO\({}_{2}\). In addition, the results indicated that the addition of TiO\({}_{2}\) could significantly refine the pores and shift them to the harmless pores. In the research conducted by [PERSON] et al. [31], it was observed that TiO\({}_{2}\) nanoparticles decreased the permeability of the cement matrix. In the research conducted by [PERSON] et al. [34] and [PERSON] et al. [33], the effect of various proportion of TiO\({}_{2}\) was studied. It was concluded that addition of TiO\({}_{2}\) up to 1% could significantly enhance the mechanical properties of concrete. This research aims to develop a cement mortar with a lower heat transfer rate and insulating properties using substitution of a natural aggregate (NA) with EGA. In this study, the effect of incorporation of EGA and TiO\({}_{2}\) nanoparticles on workability, bulk density, water penetration, compressive strength, and heat transfer rate of the cement mortar were investigated. Infrared thermography (IRT) was used to measure the thermal insulation property of EGA cement mortar. The IRT technique has been utilized to evaluate the thermal energy storage performance of building materials in previous studies [38], however it has not been used for measuring the thermal insulating property of the EGA cement mortar.