Experimental Study On Mechanical Properties Of Wheat Straw Fiber Soil-cement

As urbanization advances and the requirements of people increase,the scientific and safe building of infrastructure projects has become a major concern.Due to the thixotropic and rheology of soft soil,excessive deformation of engineering projects is common throughout the development phase.Because to its superior mechanical qualities,economical application,and simple construction,cement soil is frequently utilized in water conservation,industrial,and civil building projects.Yet,the cement soil itself has a high degree of deformation and a low resistance to folding.And wheat straw fiber,as a practical and accessible plant fiber,have high toughness.Therefore,adding fibers to it for modification can further strengthen the mechanical properties of the cement soil,so as not to pollute the environment by burning a large number of them,and also provide a program for today’s wheat straw treatment,which has the practical significance of saving resources and green environment.To improve the mechanical qualities of the cement soil,wheat straw scale as plant fiber is mixed with the cement soil to make a green composite material,utilizing the good tensile effect of wheat straw fiber.In other words,the mechanical characteristics of wheat straw fiber cement soil are examined using the lateral unlimited compressive test,the three-point bending test,and the impermeability test.The primary findings of the study are as follows:(1)When combined with the findings of three indoor experiments,the cement admixture was the primary factor in improving the cement soil’s mechanical qualities.With an increase in cement admixture and curing age,the unconfined compressive strength,flexural strength,and seepage resistance of cement soil improved.It demonstrates a strong linear connection.In addition,the impact of cement admixture on the compressive strength,flexural strength,and seepage resistance of cement soil is greater than that of curing age.(2)According to the findings of an unconfined compressive strength test,wheat straw fiber may also effectively increase the compressive strength of cement soil.There are some similarities between the effects of content of wheat straw and wheat straw length on the compressive strength of cement soil.They both exhibit a increasing and then decreasing tendency.The ideal ratio of wheat straw fiber is 0.2 %,at 10 mm.As compared to ordinary cemented soil,the compressive strength of wheat straw fiber cement soil rose by 21.8 % at this period.(3)Based on the findings of the three-point bending test,it is known that when the amount of wheat straw fiber is progressively increased,the flexural strength of wheat straw fiber cement soil likewise exhibits a tendency of increasing and subsequently decreasing.However,the variation in wheat straw length varies in its resistance to compression and flexure.The flexural strength of wheat straw fiber cement soil with the length of wheat straw fiber displays a creeping higher trend.This is because the fiber itself,according to its properties,may play a bridging function inside the cement soil when the length of wheat straw increases.Flexural strength improved by 75.6 %compared to ordinary cement soil at 0.2 % of straw fiber and 15 mm of straw fiber length,which was the ideal level.The results showed that wheat straw fiber improved the flexural strength of soil-cement more obviously.(4)According to the findings of the impermeability test,the length of the straw fiber had a greater impact on the increase in permeability performance than the quantity of straw fiber used.The permeability coefficient of wheat straw fiber cement soil gradually reduced as the fiber length increased from 5 mm to 10 mm,and the permeability performance was enhanced.When the fiber length exceeded 10 mm,the permeability coefficient gradually rose.The permeability coefficient of fiber-hydrated soil is 5.45×10-5 cm/s at a fiber length of 10 mm and a fiber dosage of 0.1 %.Its permeability coefficient is 77.3 % lower than that of cement soil.The impermeability effect is greatly enhanced in this ratio.As a result,the cement soil will develop a mesh structure with hydrophobic qualities when the appropriate quantity of wheat straw fiber is added.The permeability of fiber cement soil can be improved by reducing the water permeability.