Many researchers have developed the idea of using natural fibers instead of steel reinforcement, in addition, many researchers have developed composite materials from natural fibers such as reeds, coconut fiber, sisal, cane, forest, jute, linen, etc. But all these proposals faced the problem of biodegradation and the problem of basal behavior of concrete, so in any case this alternative is not suitable instead of using steel reinforcement.
As per my knowledge, reinforcement is introduced in concrete to improve its property and fibers have always been considered promising as reinforcement of cement. The main disadvantage is that it is of high price. Addition of fiber reduces workability. Sisal fiber reinforced concrete is the concrete with randomly distributed fibers. The failure strength and modulus of elasticity depends on the amount of cellulose and the orientation of the micro-fibers.
Many studies has been carried out to know the physical properties of conventional concrete and sisal fiber reinforced concrete and to enhance the properties of concrete using sisal fiber by replacing cement with respective percentage of fiber and finding the strength variation on concrete in different mix proportions.
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The parameters like volume percentage, distribution type, length & diameter of Sisal fibres influence the property of concrete.
These parameters have to be optimized to achieve positive results.
About 3% fiber content can be effectively incorporate in the concrete. More than that will be result in balling effect in concrete testings.
With my experimental knowledge 1.8% to 2.4% fiber volume in the concrete will yield best results.
Sisal is out of scope for my research. However I would observe that I would have concerns about about the durability of the cement, given that in the context of domestic carpet, sisal is promoted in the UK as being 100% biodegradeable. Furthermore potential users are warned against letting prolonged wetting taking place .
Research has been carried out in many countries on various mechanical properties, physical performance and durability of cement based matrices reinforced with naturally occurring fibers including sisal, coconut, jute, bamboo and wood fibers. These fibers have always been considered promising the reinforcement of cement based matrices because of their availability, low cost and low consumption of energy.
sisal fibers impose influence on the development of plastic shrinkage in the pre-hardened state, on tensile, compressive and bending strength in the hardened state of mortar mixes. Creep and drying shrinkage of the composites and the durability of natural fibers in cement based matrices are enhanced. This material could be a substitute asbestos-cement composite, which is a serious hazard to human and animal health and is prohibited in industrialized countries. The production of sisal fibers as compared with synthetic fibers or even with mineral asbestos fibers needs much less energy in addition to the ecological, social and economical benefits. Rodger E Edwards
To specify the robustness of concrete. It is commonly used in the structural engineering. This is because for the following reasons: 1) high compressive strength, 2) low cost. 3) Plentiful raw material. As well, there are two main insufficiency: 1) low tensile strength. 2) Low strain at fracture
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