PSI - Issue 64

Barbara Klemczak et al. / Procedia Structural Integrity 64 (2024) 1126–1133 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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3. Results In all the samples examined, voids of regular shapes are predominant, and their diameter varies depending on the density of the foamed concrete (see Fig. 3 ). The largest air voids, with diameters slightly exceeding 1 mm, are observed in foamed concrete with the lowest density of 350 kg/m 3 . As the density increases, there is a noticeable reduction in the diameter and quantity of these air voids, a change attributed to the higher amount of paste present in foamed concretes of higher densities, specifically 500 kg/m 3 and 700 kg/m 3 . The presence of Microencapsulated Phase Change Material (MPCM) is not noticeable in the provided images due to insufficient magnification. Notably, there appears to be no significant difference in the size and distribution of air voids when MPCM is used as a partial substitute for the binder (see Table 2 ). Consequently, the uniformity of structure and regularity of air voids are consistent across the produced samples, whether MPCM is included or not. 350 350_10% MPCM 350_20% MPCM

500

500_10% MPCM

500_20% MPCM

700

700_10% MPCM

700_20% MPCM

Fig. 3. Microscopic images of the tested foamed concrete

The compressive strength results are depicted in Fig. 4 . As expected, compressive strength rises with the density of the foamed concrete and decreases with increasing MPCM addition. This impact of MPCM on strength is