Title:
Variation of the Hydraulic Conductivity and the Mechanical Characteristics of Plastic Concrete with Time
Author(s):
Ali Basha & Walid Mansour
Publication:
IJCSM
Volume:
17
Issue:
Appears on pages(s):
Keywords:
Plastic concrete, Secant pile, Hydraulic conductivity, Compressive strength, Tensile strength
DOI:
10.1186/s40069-023-00589-1
Date:
7/31/2023
Abstract:
Sand-bentonite-cement are commonly used as cut-off walls to isolate polluted soils or in ground improvement technologies and as retaining structures as secant pile wall. In this research, a laboratory program consisted from 105 sample were prepared and tested between different tests, such as hydraulic conductivity, porosity, and compressive strength to monitor the mechanical behavior of sand-bentonite-cement at different ages. Based on the experimental relationships between hydraulic conductivity coefficient and samples age; there were reduction due to added bentonite to mixture reach about 35.0% at 7 days. Moreover, the average reduction in the compressive strength of plastic concrete samples with bentonite was lower by average range about 51.0% than the compressive strength of plastic concrete samples without bentonite at 7 days. In this study, proposed formulas were derived to estimate the splitting tensile strength based on the compressive strength and the hydraulic conductivity in terms of the bentonite/cement ratio and testing age. The predicted values showed well agreement with the experimental records for samples of sand-bentonite-cement mixtures where the standard deviation and coefficient of variation were 0.02, and 0.94%, respectively.