## 4 Conclusions  
In this study, investigation of performance characteristics of LWC with porous aggregates such as EG and CEPW was performed. During the study, LWC density, thermal conductivity, compressive strength, bending strength, water absorption, deformations, composite structure, and freezing-thawing resistance were analysed and the following results were obtained:  
The modification of LWC with CEPW aggregate allows improvement of the thermal characteristics of the material without deteriorating the compressive and bending strength values. Incorporation of CEPW leads to changes in the macrostructure and results in a decrease in the number of large voids in the LWC, leading to an overall decrease in thermal conductivity from 0.0977 to 0.0720 W/(mK).  
It was determined that, with a 1.5-times increase in LWC density, the long-term absorption decreases by approximately 1.41 times. The evaluation of the effect of the CEPW on the water absorption of the specimens shows that only with EG aggregate and when part of the EG aggregate is replaced by CEPW aggregate are the average values of the results similar to the overall average of the results.  
The amount of LWC deformations, due to increased or decreased humidity, can be reduced by using CEPW aggregate. The lowest shrinkage value of 0.11 mm/m and an expansion value of 0.17 mm/m are observed when the LWC structure is modified with CEPW aggregate and 70 kg/m\({}^{3}\) of OPC is used.  
The durability of LWC products increases, not only by increasing the amount of cement in the material, but also by modifying the structure with CEPW aggregate. The degradation of the compressive strength value of the specimens with EG and CEPW aggregate after 200 freeze-thaw cycles with the highest binder content of 130 kg/m\({}^{3}\) was about 3 times lower than of the specimens without CEPW aggregate. Microstructural studies confirmed that the CEPW contained in the LWC is not damaged during freezing and does not allow the formation of continuous cracks throughout the volume of the LWC.  
In order to produce an effective thermal insulation material from LWC with sufficient strength characteristics, the influence of the CEPW size on strength characteristics and the influence of the ratio of EG and CEPW should be analysed in more detail in the future, in order to further reduce thermal conductivity, improve macrostructure, and increase durability.  
**Author Contributions:** Conceptualisation, [PERSON] ([PERSON]) and [PERSON]; methodology, [PERSON] ([PERSON]), [PERSON] and V.K.; software, [PERSON] and [PERSON]. ([PERSON]); validation, [PERSON] and V.K.; formal analysis, [PERSON] ([PERSON]) and [PERSON] ([PERSON]); investigation, [PERSON] ([PERSON]), A.K., V.K., [PERSON] ([PERSON]) and [PERSON]; resources, [PERSON] and [PERSON]. ([PERSON]); data curation, [PERSON] ([PERSON]); writing--[PERSON]. ([PERSON]) and [PERSON]; writing--review and editing, [PERSON] ([PERSON]) and [PERSON] and A.K.; visualisation, A.K.; supervision, [PERSON] ([PERSON]) and [PERSON]. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.