Conditions Causing Piping in Compacted Clay

Effect of Biocementation via Enzymatic Induced Calcium Carbonate Precipitation (EICP) on the Shear Strength of Compacted Clay Liner

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1153/1/012008 ◽

2021 ◽

Vol 1153 (1) ◽

pp. 012008

Author(s):

M U Zango ◽

K A Kassim ◽

A S Muhammed ◽

K Ahmad ◽

J Makinda

Keyword(s):

Shear Strength ◽

Calcium Carbonate ◽

Carbonate Precipitation ◽

Compacted Clay ◽

Calcium Carbonate Precipitation ◽

Clay Liner ◽

Compacted Clay Liner

Download Full-text

Hydraulic and Swell–Shrink Characteristics of Clay and Recycled Zeolite Mixtures for Liner Construction in Sustainable Waste Landfill

Sustainability ◽

10.3390/su13137301 ◽

2021 ◽

Vol 13 (13) ◽

pp. 7301

Author(s):

Marcin K. Widomski ◽

Anna Musz-Pomorska ◽

Wojciech Franus

Keyword(s):

Hydraulic Conductivity ◽

Exchange Capacity ◽

Saturated Hydraulic Conductivity ◽

Clay Soils ◽

Compacted Clay ◽

Clay Liner ◽

Compacted Clay Liner ◽

Drying And Rewetting ◽

Swelling Characteristics ◽

Shrinkage And Swelling

This paper presents research considering hydraulic as well as swelling and shrinkage characteristics of potential recycled fine particle materials for compacted clay liner for sustainable landfills. Five locally available clay soils mixed with 10% (by mass) of NaP1 recycled zeolite were tested. The performed analysis was based on determined plasticity, cation exchange capacity, coefficient of saturated hydraulic conductivity after compaction, several shrinkage and swelling characteristics as well as, finally, saturated hydraulic conductivity after three cycles of drying and rewetting of tested specimens and the reference samples. The obtained results showed that addition of zeolite to clay soils allowed reduction in their saturated hydraulic conductivity to meet the required threshold (≤1 × 10−9 m/s) of sealing capabilities for compacted clay liner. On the other hand, an increase in plasticity, swelling, and in several cases in shrinkage, of the clay–zeolite mixture was observed. Finally, none of the tested mixtures was able to sustain its sealing capabilities after three cycles of drying and rewetting. Thus, the studied clayey soils mixed with sustainable recycled zeolite were assessed as promising materials for compacted liner construction. However, the liner should be operated carefully to avoid extensive dissication and cracking.

Download Full-text