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Enhancing the Strength Parameters of Dispersive Soil with Microbes and Jute Fibres as Sustainable Alternative

Suriya Pa, Sangeetha S. P.

Ecological Engineering & Environmental Technology

2023

Vol. 24, iss. 1

154--164

Aim of this study was assessing the characteristics of dispersive soil based on percentage of dispersion and degree of dispersion and to improve the strength of soil using microbes. This research has utilized the Microbial Induced Calcium Carbonate process (MICP) in conjunction with jute fibre for the improvement the erosive resistance in dispersive soil. Calcite formation occurred as a consequence of microbial biomass in voids of dispersive soil. Calcium carbonate was synthesized in the gaps of the soil matrix during the microbiological process. Bacillus sphaericus bacteria were used in this experiment, along with a 1 cm length of jute raw fibre of 1 cm long and a cell concentration of 6.4E+08 CFU mL-1. The findings of the Unconfined compressive strength (UCS) test showed following of MICP treatment with and without jute fibre augmentation, UCS values causing the 11 and 13 times. Crumb test findings showed no colloidal solution was generated after microbial treatment, which was used for confirmation of the degree of dispersiveness reduction. Addition of jute fibres indicating better precipitation values of more than 4% due to the internal bonding strength. Ground renovation through microbial cementation yielded promising benefits, suggesting sustainability.

Ocena podatności gruntów spoistych na erozję koloidalną na podstawie wyników testu kanalikowego

Batog Andrzej, Hawrysz Maciej, Stróżyk Joanna

Geologos

2007

Vol. 11

421--428

W pracy opisano metodę prostego, bezpośredniego pomiaru dyspersyjności gruntów spoistych za pomocą testu kanalikowego (pinhole test). Test kanalikowy uważa się za najbardziej wiarygodną metodę umożliwiającą identyfikację gruntów dyspersyjnych, podatnych na erozję koloidalną. W pracy przedstawiono niektóre wyniki badań gruntów spoistych wykorzystanych do naprawy i wzmocnienia obwałowań rzeki Odry. Wykazano, że powyższe grunty należą do niedyspersyjnych.

The paper contains the description of the test method for a direct, qualitative measurement of the dispersibility of clayey soil - pinhole test method. The pinhole test is considered the most reliable for identification dispersive clays, susceptible to colloidal erosion. Some results of investigation of cohesive soils used do reconstruction Odra river embankments are presented. It has been indicate that, presented soils are not dispersive.