X-ray diffraction study on new organic- natural building materials

Experimental Investigations on the Performances of Composite Building Materials Based on Industrial Crops and Volcanic Rocks

“…The hemp shiv lost 3.6% on the first temperature interval from 20-200 • C and 77.6% on the second one, from 200 and 1000 • C. Compared with References [27,28], the second temperature interval is defined by the thermal combustion of hemicellulose and cellulose. The X-ray diffraction (XRD) of the hemp shiv was presented in a previous study [19], where the higher peak was recorded at 2 θ = 22.66 • , similar to the studies of References [25,29]. The peak represents the crystallographic plane of the cellulose.…”

“…The water molecules from the initial stage evaporate during the heating process, cracks appear as a consequence of the steam leak, therefore the resulting cavities will define the perlite structure [34,36,37]. The X-ray diffraction graph of perlite, from Reference [19], resembles the curve shape of powder perlite studied in Reference [38], indicating an amorphous structure already identified in previous studies [39,40]. The crystalline phase of perlite is provided by the compound of SiO 2 and the amorphous structure is given by the aluminosilicate compounds [39].…”

“…The deterioration from the second and the third temperature interval, from 200 to 580 • C (34.74%) and 580 to 100 • C (25.37%) is characteristic of the lime degradation process [12]. The X-ray diffraction diagram of the treated hemp shiv indicated the same shape of graph as with the natural hemp shiv from Reference [19]. The difference consisted in the identification of new crystalline compounds-Ca(OH) 2 calcium hydroxide and CaCO 3 calcium carbonate.…”

“…The results were analyzed according to the influence of volcanic rocks on the new composites.Crystals 2020, 10, 102 2 of 21 consideration in the construction sector. There is a significant number of studies on hemp shiv with lime, which is a composite material named hempcrete [12][13][14], but there are only few studies that concern hemp shiv with cement [15][16][17][18][19].Due to the fact that hemp shiv presents poor fire resistance, a new approach can be made with volcanic rocks, which are natural products with higher fire resistance [20]. These materials are usually found in the composition of mortars used in the rehabilitation process of the walls, because of their increased mechanical resistances [21].…”

“…Crystals 2020, 10, 102 2 of 21 consideration in the construction sector. There is a significant number of studies on hemp shiv with lime, which is a composite material named hempcrete [12][13][14], but there are only few studies that concern hemp shiv with cement [15][16][17][18][19].…”