92
Chapter 7. Conclusions
A series of experiments was carried out to investigate the effect of cornsilk fiber on mechanical characteristics of waste soil stabilized with cement and natural fiber material. In addition, this research also did some result analysis from experimental data such as proposing the relationship of compressive strength versus splitting tensile strength, compressive strength versus direct tensile strength, etc.; developing some regression models for predicting compressive, tensile strength relying on basic parameters consisted of curing time, cement content, and fiber content; and determining the effective degree of parameters on strength properties based on sensitivity analysis.
According to the experimental and analysis results, the conclusions can be withdrawn as follows:
Three methods to recycle waste soil and natural fiber were used in this research. The stabilized soil could be used as ground and building material.
The addition of fiber and cement in soil results in the improvement of compressive strength and tensile strength in general.
For method of fiber reinforced soil, the fiber length and fiber content significantly affect to maximum dry unit weight and optimum water content. In term of compressive strength, the optimum fiber content and fiber length for this method are 1% and 10 mm, respectively with the most improvement of 38%. Meanwhile, the most improvement in splitting tensile strength of specimen corresponding to fiber content of 2% and fiber length of 50 mm is about 210%. The addition of fiber also improves secant modulus as well as toughness.
For cemented soil reinforced with fiber, The most enhancement of compressive strength and tensile strength are 177% and 88%, respectively. The optimum fiber content in this method when using cornsilk fiber is 0.25%-0.5%. Fiber inclusion results in the appearance of residual stress-strain curves when conducting direct tensile test. The energy absorption capacity, stress-strain curve, and direct tensile strength increase with the fiber addition.
Direct tensile strength could be determined from compressive strength and splitting tensile strength by a relation coefficient of 0.071 and 0.483 respectively. Multiple nonlinear regression models were proposed to evaluate strength properties. These models could be acceptable to use. The effective degree of the parameters including curing time, cement content, and fiber content on compressive and splitting tensile strength is investigated.
Cement content is the most effective parameter followed by curing time and fiber content.
93
The simplification procedure for build the regression models for predicting the problems is acceptable.
In conclusion, based on on the viewpoints of engineering, environment, and economic, we can conclude that the cornsilk fiber could be considered as a good fiber material for using in the method of soil or cemented soil reinforced with fiber.
94
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103 LIST OF PUBLICATIONS
Peer-reviewed journal papers:
[1] Khiem Quang Tran, Tomoaki Satomi, Hiroshi Takahashi, Tensile behaviors of natural fiber and cement reinforced soil subjected to direct tensile test, Journal of Building Engineering. Vol. 24, July, 2019. doi:10.1016/J.JOBE.2019.100748.
[2] Khiem Quang Tran, Tomoaki Satomi, Hiroshi Takahashi, Effect of waste cornsilk fiber reinforcement on mechanical properties of soft soils, Transportation Geotechnics. Vol. 16, pp. 76–84, Septemper, 2018. doi:10.1016/j.trgeo.2018.07.003.
[3] Khiem Quang Tran, Tomoaki Satomi, Hiroshi Takahashi, Improvement of mechanical behavior of cemented soil reinforced with waste cornsilk fibers, Construction and Building Material, Vol. 178, pp. 204-210, July, 2018. doi:10.1016/j.conbuildmat.2018.05.104.
[4] Khiem Quang Tran, Tomoaki Satomi, Hiroshi Takahashi, Study on strength behavior of cement stabilized sludge reinforced with waste cornsilk fiber, International Journal of GEOMATE, Vol. 13, pp. 140–147, 2017. doi:10.21660/2017.39.28994.
Conference papers and posters:
[1] Khiem Quang Tran, Tomoaki Satomi, Hiroshi Takahashi, Study on Effect of Corn Silk Fiber in Soil Stabilization, Proceedings of 4th Congres International de Geotechnique-Ouvrages-Structures, Vol.1, 2017,
[2] Khiem Quang Tran, Tomoaki Satomi, Hiroshi Takahashi, Effect of Waste Cornsilk Fiber on Tensile Strength of Fiber-Cement Sludge and Model for Estimation of Tensile Strength, Proceedings of 2nd Joint Seminar on Landslide, Flood Disasters and the Environmental Issues, Vol.2, Paper No.S3-2, pp.1-10, 2018.
[3] Khiem Quang Tran, Tomoaki Satomi, Hiroshi Takahashi, Improvement of Mechanical Behavior of Cemented Soil Reinforced with Waste Natural Fiber, The 1st Academic Forum on Environmental Studies.