Abstract
The aim of this paper was to review the mechanism of the expansive soil-lime reactions: short term and long-term reactions in both lime modification and lime stabilization. The focus of the study was the effect of curing time for a certain centigrade 25C curing temperature in both lime modification / stabilization-expansive soils on the coefficient of permeability. Peer reviewed articles published between 2000- and 2019 were collected and relevant data were extracted. Results of this review study showed that the coefficient of permeability of expansive soils modified with lime increased during the first 7 days of curing time at curing temperature 25C and it remains constant or slightly decreased for longer curing time periods. However, for expansive soils stabilized with lime, it was found that the coefficient of permeability increased during the first 7-day curing time at curing temperature 25C, then decreased during the longer curing time periods (pozzolanic reaction). It is also noted that even though the coefficient of permeability decreased during pozzolanic reaction, it remains higher than that of the untreated soils
Highlights
In most engineering geotechnical problems, water is a critical factor
It should be important to note that this review study was limited to the data that have similar initial conditions: curing temperature was 25C, specimens were prepared at optimum moisture content and maximum dry density, lime was added to the soil as a percent by weight of the soil, and the added lime was a hydrated lime (Ca (OH)2)
Since the goal of this study was to dig deeper in soil structures and soil pores that helped to understand the change in the coefficient of permeability, studies used advanced technology such as Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Mercury Intrusion Porosimetry (MIP) have been selected
Summary
In most engineering geotechnical problems, water is a critical factor. Engineering behavior of soils clayey soils will be affected by the water presence [1]. Predominantly composed of clay, is highly affected by water. It suffers from volume change when its water content change. Montmorillonite is considered the most critical mineral because its tendency to absorb water more than other types of minerals resulted in significant volume changes. Clay particles absorb water and tend to swell, or they lose water due to evaporation and tend to shrink [2]. That causes to severe distress to various infra structures and residential houses built on expansive soils resulted in significant economic
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