دانلود رایگان مقاله آنالیز بلوک زمین فشرده (CEB) با نیروهای الیاف موز، مقاوم در برابر خمشی و فشاری

Abstract

The development of affordable housing is necessary due to the numerous homeless people living in developing countries; the present work is an attempt to alleviate the housing problem facing populations of these countries. Building with Compressed Earthen Blocks (CEBs) is becoming more popular due to their low cost and relative abundance of materials. The proposed innovative Banana-Compressed Earth Block (B-CEB) consists of ordinary CEB ingredients plus banana fibers, which will be the focus of this study. Banana fibers are widely available worldwide due to agricultural waste from banana cultivation. Additionally, banana fibers are environmentally friendly and present important attributes, such as low density, light weight, low cost, high tensile strength, as well as being water repellent and fire resistant. This kind of waste has a greater chance of being utilized for different applications in construction and building materials in order to enhance the mechanical properties of the CEBs. Such enhancements will raise the number of storeys of a building that can be built with CEBs. Experimental work studies on the classic CEB with no fibers and B-CEB were performed, including an axial compression test and flexural test (three-point bending test) by using testing methods according to American Society for Testing and Materials (ASTM) standards (ASTM C-67). Also, in order to obtain the load-deflection curve and bending modulus (E) from the flexural test, the Linear Variable Differential Transformer (LVDT) sensor was placed under the mid-span of the block for vertical displacement measurements. The results of this study will highlight general trends in the strength properties of different design mixes by adding different lengths of banana fibers in the CEBs. These efforts are necessary to ensure that B-CEB technology becomes a more widely accepted building material that will verify the earth building technology for offering affordable houses.

6. Summary and conclusions

Banana-Compressed Earth Block (B-CEB) as an alternative building material is critical to developing technology which can be adopted and implemented wherever affordable housing is needed. This study provided a foundation for developing an appropriate standard of care applied to B-CEB technology. Influence of banana fibers on the mechanical properties of CEBs were studied in this investigation. Based on the experimental and analytical works, the following summary and conclusions were made: 1. From the experimental work, it is concluded that the blocks constructed by adding banana fibers (B-CEB) throughout the mix performed better than the block with no fibers (CEB) in both compressive and flexural strength. 2. The average compressive strength of block with 60 mm natural banana fiber (mix #3) and with 70 mm banana fibers (mix #4) recorded the higher stresses with about 71% and 68% increase respectively over CEB with no fibers (mix #1). 3. The fiber reinforced B-CEBs of (mix#3) with fiber length of 60 mm and (mix#4) with fiber length 70 mm performed the highest stresses with a significant increase by 77% and 82% respectively compared to (mix #1) with no fibers. 4. All the fiber-reinforced blocks were exposed to mid-span deflection ranges between 0.6 mm and 1 mm, depending on the fiber length, while the unreinforced blocks were exposed to maximum mid-span deflection of 0.26 mm. 5. Strength increase was due to the creation of isotropic matrix between the structure soil mix and the fiber network; such a matrix opposed movement of particles and created stability mainly because fibers appeared to distribute tension throughout the bulk of material. In other words, the presence of all-directional fibers improved tensile and compressive strength, which was contributed to banana fibers. 6. This case study aims to use local raw earth as a building construction material extensively which also using a local resource that is energy saving, eco-friendly, higher strength and sustainable development to help develop technologies.