Influence of discrete fibre reinforcement on the uniaxial compression response and seismic wave velocity of a cement-stabilised sandy-clay

Abstract

a b s t r a c tA sandy clay from the northeast region of Portugal has been reinforced with polypropylene fibres and cement, and seismic wave velocity measurements and uniaxial compression strength tests were performed. Results showed that the fibre induce variations on the wave's velocity that cannot be related to real changes in the material stiffness. Therefore, care should be used when using this technique in fibre reinforced soils. The addition of fibres resulted in an increase of compression strength of the mixtures, for every cement content. Regarding the stiffness, the fibres proved to be increasingly effective with an increase in cementation, especially at the early stages of the stressestrain curve, when the secant deformability modulus increases with fibre content. However, no influence of the discrete reinforcement was detected on the peak and post-peak stages of the loading process. Fibre length showed also to be influential on strength and stiffness.

Fundamentals of soil stabilization

“…The results also indicated that the relative benefit of fibers to enhance the UCS of the clay soils is largely dependent on initial dry unit weight and water content of the soil. Cristelo et al [61] studied the performance of fiber reinforced clayey soil. They found that the excessively compressible clayey soil reinforced with randomly mixed fibers, resulted in higher ultimate bearing capacity, and lesser settlement at the ultimate load.…”

Behavior of cement-stabilized fiber-reinforced pond ash, rice husk ash–soil mixtures

“…Fatahi et al (2013) carried out bender element tests on 126 cylindrical samples of cement-treated kaolinite and bentonite clays with various cement and fiber (polypropylene and recycled carpet) contents to discern the relationship between fiber and cement content and the small-strain mechanical properties, including the shear wave velocity and maximum small-strain shear modulus of treated soils. Cristelo et al (2015) carried out ultrasonic wave and uniaxial compression tests to measure P-wave velocity and compression strength in cement-stabilised sandyeclay reinforced with polypropylene fiber. Tests results indicated that stiffness and compression strength of sandy soil, increases with cement and fiber content.…”

Influence of fibre reinforcement on the post-cracking behaviour of a cement-stabilised sandy-clay subjected to indirect tensile stress

“…Cristelo N et al, Influence of fibre reinforcement on the post-cracking behaviour of a cement-stabilised sandy-clay subjected to indirect tensile stress, Construction and Building Materials, Elsevier, 138: 163-173, 2017. Doi: 10.1016/j.conbuildmat.2017.02.010 5 Additional geotechnical and microstructural details, as well as a more thorough explanation on 95 the preparation of the fibres, can be found in (Cristelo et al, 2015). The following is the essential 96 information presented in the aforementioned paper.…”