PSI - Issue 71

Dharmadas Bairagi et al. / Procedia Structural Integrity 71 (2025) 417–423

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To investigate the effect of surface treatment, BBC panels were applied with paper on both surfaces of panel. Normal wood based brown paper was stick to both faces of panels with poly vinyl acetate (PVA) based glue. Tests on raw material were carried out according to prevalent standards to assess feasibility. Physical (Dimensions, Density, Sorptivity test, Water absorption test) Mechanical (Modulus of rupture (MOR) Breaking Strength test) and Thermal conductivity test were performed on panel samples as per prevalent I S Standards. Representative samples are shown in figure 2d-2f.

Mould for panel

Panel with Bamboo mesh

Sample panel

Samples for flexure testing

Flexure testing

Samples for sorptivity testing

Figure 2: Samples for Experimental Investigation

3. Result and Discussion 3.1. Material Properties

Soil is fine silty sand (SM) with liquid limit of 45%, plastic limit 25% and plasticity index 20. Soil has D60=0.78, D30=0.28, D10=0.08, coefficient of curvature (Cc) = 4.42 and co-efficient of uniformity (Cu) = 9.763. Bamboo fines are well graded as Cc is 3 and between 1 and 3. Particle size was found as D60 = 1.546, D30 = 0.782, D10 = 0.131, Cu = 11.781 and Cc = 3.0. Lime has particle size between 1 mm to 0.1 mm. Bulk Density and moisture content of raw material is given in table 1. Table 1: Bulk Density (g/cc) of raw materials Materials Bamboo Fines Lime Soil PoP Coir Fiber Bulk Density (g/cc) 0.256 0.664 1.42 0.916 0.096 Moisture Content (%) 10.25 15.35 6.75 - 3 Results of test for investigating the lime binder to soil ratio are presented in fig 3. It suggests that a ratio of lime binder to soil as 80:20 gives maximum strength. This is in line with the theory of lime soil reaction. Thus, L80S20 with (lime: PoP: soil as 3:1:1) composition was taken as binder. Results of tests for deciding optimum binder to filler ratio show that as bamboo fine proportion increases the compressive strength decreases (figure 4) this trend is observed due to lower density of bamboo fines. Also, the coating of matrix to bamboo fine is reducing with increase in percentage of bamboo.