First experimental results on “clay and bentonite” mixtures for the waterproofing of a landfill in Northwestern Piedmont Region (NW Italy)

Authors

  • Diego Barbero Geological, Geotechnical and Geophysical Office of Dr. Diego Barbero
  • Andrea Maroni Geology Student and collaborator at Geological, Geotechnical and Geophysical Office of Dr. Diego Barbero, Asti, Italy
  • Sandra Peyrot Freelance Geologist, Torino, Italy

Keywords:

clay and bentonite mixtures, hydraulic conductivity, infiltration tests, permeability laboratory tests, landfill waterproofing

Abstract

We report on experimental results conducted on “clay and bentonite” mixtures for the waterproofing of a tank landfill located in Northwestern Piedmont Region (NW Italy).

The geotechnical experimental tests on “clay and bentonite” mixtures were conducted in the laboratory first, with the aim of finding the optimum percentage of granular bentonite to be added to the clay and then, they were carried out in situ, in the tank, on the layer of “clay and bentonite” rolled and compacted.

The optimum percentage of bentonite to be added to the clay is able to guarantee values of hydraulic conductivity of 1.00 x 10-7 cm/s as required by normative standards of specifications for the bottom of a tank for the waterproofing of the landfill.

The goal of the paper is to propose a geotechnical methodology to carried out when geologists and engineers have to design a mineral barrier for the waterproofing of a tank, using clayey soils enable to guarantee the isolation of the waste and preventing the infiltration of the percolate in the subsoil. In this case, we suggest to realize an optimum mixture of “clay and bentonite” for the waterproofing of the tank.

The experimental tests allow us to find not only the optimum percentage of bentonite to be added to the clay, but also to design the minimum thickness of the layer of “clay and bentonite” to lay on the bottom of the tank for the waterproofing of the landfill.

References

A.S.T.M. D422 1998. Standard test methods for particle-size analysis of soils.

A.S.T.M. D4318 2000. Standard test methods for Liquid Limit, Plastic Limit and Plasticity Index of soils.

Barbero D., Maroni A., Peyrot S. 2020. Laboratory permeability and single ring infiltration tests for the testing of waterproofing barriers of landfill tanks. Journal of Geotechnical Engineering, in press.

Downloads

Published

2020-09-25

Issue

Vol. 7 No. 2 (2020)

Section

Articles

License

Declaration and Copyright Transfer Form

(to be completed by authors)

I/ We, the undersigned author(s) of the submitted manuscript, hereby declare, that the above manuscript which is submitted for publication in the STM Journals(s), is not published already in part or whole (except in the form of abstract) in any journal or magazine for private or public circulation, and, is not under consideration of publication elsewhere.

  • I/We will not withdraw the manuscript after 1 week of submission as I have read the Author Guidelines and will adhere to the guidelines.
  • I/We Author(s ) have niether given nor will give this manuscript elsewhere for publishing after submitting in STM Journal(s).
  • I/ We have read the original version of the manuscript and am/ are responsible for the thought contents embodied in it. The work dealt in the manuscript is my/ our own, and my/ our individual contribution to this work is significant enough to qualify for authorship.
  •  I/We also agree to the authorship of the article in the following order:

Author’s name                                    

 

1. ________________

2. ________________

3. ________________

4. ________________

 

We  Author(s) tick this box and would request you to consider it as our signature as we agree to the terms of this Copyright Notice, which will apply to this submission if and when it is published by this journal.