PSI - Issue 64

Nathália Andrade da Silva et al. / Procedia Structural Integrity 64 (2024) 1460–1467 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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It is important to note, however, that despite the reduction in workability observed with higher proportions of bio aggregates, it has been found that mixtures containing bamboo aggregates volumetric fractions up to 50% exhibit good workability and result in homogeneous composites.

Fig. 2. Relationship between bio-aggregates content and workability of bio-concretes .

The study carried out by Siqueira et al. (2023) remains the sole one conducted thus far to utilize the Vee-Bee time test for evaluating the fresh state characteristics of bio-concrete. This uniqueness arises from its emphasis on incorporating coarse bamboo aggregates and sand, leading to drier mixtures compared to previous studies. Furthermore, due to the larger size of the bio-aggregates used, conventional flow table testing becomes impractical as it presents challenges in uniformly inserting the mixture into the cone. The research findings indicated that a higher proportion of sand to cementitious materials leads to a drier mixture, thereby increasing the Vee-Bee time.

2.4. Density of bamboo bio-concretes

One of the primary benefits of using bio-concrete in construction is its lower density. As illustrated in Fig. 3, the density of the bio-concrete investigated ranged from 694 to 1390 kg/m³, making it categorized as lightweight concrete with a density below 2200 kg/m³. This characteristic offers an advantage, particularly concerning the structure's weight and the resulting stress on the foundations. Analysis of the data presented in Figure 4 indicates a noteworthy decrease in density with higher levels of vegetable aggregate added to the mixture.

Fig. 3. Relationship between bio-aggregates content and density bio-concretes .