SISAL

About: SISAL is a research topic. Over the lifetime, 1878 publications have been published within this topic receiving 55528 citations.

Effect of sisal fibre on partially replaced cement with Periwinkles Shell Ash (PSA) concrete

Abstract: An investigation on the effect of sisal fiber on partially replaced cement with Periwinkle Shell Ash in Concrete was carried out. Sisal fiber of 40mm length which forms 1% of the mix by weight with Periwinkle shell Ash as a partial replacement for cement was used to cast the concrete. Compressive strength test was carried out using 0%, 5%, 10%, 15%, 20%, 25% and 30% of Periwinkle Shell Ash as partial replacements of cement at different curing ages of 7, 14, 21 and 28 days. A skewed result was observed showing a significant increase in the compressive strength recorded in 21 and 28 days of curing whose peaks are at 5% replacement of PSA in the fiber-reinforced-concrete after which, there was a continuous decline in compressive strength of concrete as the percentage of PSA increased. The peak compressive strength value of 28.8 N/mm 2 was obtained at 40mm sisal fiber and at 28 days curing age. This is followed by a compressive strength value of 26.15 N/mm 2 after 21days of curing, all gotten at 5% PSA replacement. This makes 5% the optimal and apparently an exclusive PSA content for Sisal fiber-reinforced concrete. Keywords: Sisal fibre, Periwinkle shell ash (PSA), Compressive strength, Concrete

Structural-chemical characterization and potential of sisal bagasse for the production of polyols of industrial interest

Abstract: Sisal is a potential raw material for the production of bioproducts because it has high contents of cellulose and hemicellulose that generate fermentable sugars and can produce compounds of value for industrial use. The present study evaluates the structural composition of sisal bagasse to use it in the production of arabitol and xylitol. Sisal bagasse was characterized by determination of the moisture, pH, ash, soluble solids, extractives, alpha cellulose, holocellulose, hemicellulose and lignin. Electron microscopy and infrared and X-ray diffraction analyses were also performed. The cell growth of the yeast Debaryomyces hansenii in synthetic media was tested to determine the best conditions for the fermentation in the sisal bagasse hydrolysate. The results showed high amounts of hemicellulose (22.91%) in sisal bagasse biomass when compared to sugarcane and the conversion of hemicellulose, breaking into pentoses in the hydrolysed liquor from the sisal bagasse, was efficient (liquor rich in pentoses). These evidences were obtained through analytical determinations such as SEM and physical analyses of infrared and X-ray diffraction; in addition, the results showed that D. hansenii gave excellent arabitol production (1.14 g L−1) values in the sisal bagasse hydrolysate medium, thus demonstrating the importance of the biomass for obtaining bioproducts.

Effect of Cyclic Loading Frequency on the Behavior of a Stabilized Sand Reinforced with Polypropylene and Sisal Fibers

Abstract: When any material is subjected to dynamic loads, the evaluation of the repercussions of the cyclic loading on the mechanical properties is essential to understand its behavior better. Thus, based on the results of unconfined compression strength tests carried out with and without the application of cyclic loading, this work analyzes the effect of the frequency of the cyclic stage on the behavior of a stabilized sandy soil, unreinforced and reinforced with polypropylene and sisal fibers. The inclusion of fibers induces a decrease in the accumulated permanent axial strain obtained at the cyclic stage; this reduction is more significant for a frequency of 1.0–2.0 Hz and for the use of sisal fibers, due to the greater roughness and higher mechanical properties of this type of fiber. The cyclic stage induces an increase in stiffness for all frequencies studied. In terms of the unconfined compressive strength, the frequency has a low impact on unreinforced material, contrary to the effect on reinforced material, which induces a decrease in strength for a frequency of 1.0 Hz and an increase in strength for frequencies of 2.0 and 4.0 Hz for both types of fibers. Reinforcement with sisal fibers is more effective than the use of polypropylene fibers in terms of the improved unconfined compressive strength and stiffness of the specimens submitted or not to cyclic loading.

Stiffness Behavior of Sisal Fiber Reinforced Foam Concrete under Flexural Loading

Abstract: This work investigated the static and fatigue behavior of sisal fiber-reinforced foam concrete under flexural loading. In particular, the effect of fiber content (0–0.3 vol.%) was determined by measuring the strains at two positions (mid-span and near the support of the beam) to relate with the flexural stiffness. The results showed that under static loading, sisal fiber can increase the flexural strength and decrease the flexural stiffness of the foam concrete when the specimen broke, especially, as the sisal fiber content was taken as 0.15%. Under cyclic loading, the flexural stiffness of the plain foam concrete decreased rapidly at the beginning, sisal fiber can delay the stiffness degradation of composites. When the sisal fiber content is below 0.05%, a linear relationship between the flexural stiffness and the logarithmic fatigue life of the composite was found. But for fiber content above 0.05%, another linear relationship was obtained when the fatigue life was used. It was also found that the flexural stiffness obtained from two positions was linearly correlated. If the slopes of the fitting lines were fixed as 2, a mathematical model between the flexural stiffness at the mid-span and the flexural stiffness near the support was obtained.