**3. Conclusions**

*Geopolymers and Other Geosynthetics*

*HFO granules (point 1) in the geopolymeric matrix (point 2).*

**Figure 7.**

**Table 3.**

*pH = 7 for 1 day.*

**6**

consumed in the indoor conditioning.

compressive strength was doubled as shown in **Figure 6A**. It was observed also that the density of products was reduced by up to 10%, **Figure 6B**, thanks to the addition of vascular LC fiber as reinforcement. This reduction in density is due to the fact that these fibers exhibit low bulk density compared to the geopolymer matrix. The most important influence for LC fibers on the mechanical properties of geopolymers is to significantly increase the tensile strength as shown in **Figure 6C**. Brittle geopolymer matrix also acquires the ductile failure thanks to LC fibers. It is observed in this research that the LCF geopolymer composites have attracted mechanical and physical properties. In addition, the presence of multiple structures of porous networks, whether the geopolymeric matrix or the vascular LC fibers, plays an active role in the manufacture of passive cooling materials. Thus, these materials can be used as construction materials and in reducing the energy

*Concentration (ppm) of leached metals from crude HFO and HFP geopolymer matrix after immersion in* 

**Element Toxicity (IUPAC) [19] HFO (ppm) HFO geopolymer matrix (ppm)**

Na X 21.6 179.2 Ca X 0.6 1.6 Zn X 164.0 0.0 Mg X 0.1 0.6 Fe X 3.3 0.1 Mn X 1.0 0.0 Al X 189.0 39.2 Ni Toxic 32.0 0.0 Co Toxic 0.1 0.0 Pb Toxic 1.6 0.0 Cu Toxic 1.2 0.0 Cr Toxic 4.1 0.0

There are several challenges and drawbacks facing the commercialization of geopolymers as an alternative to conventional cement and other conventional materials in construction. One important strategy to overcome these challenges is the manufacture of functional geopolymers with multiple uses. Three different applications of polymers in the fields of water purification, passive cooling systems, and waste recycling were presented in this introductory chapter. It is noticeable that the results are of great importance in many applications and confirm that this strategy will play a key role in the commercialization of geopolymers as products with multiple uses in engineering and environmental applications.
