الفهرس 
Physical and Chemical Properties of BentoniteOnly 14 pages are availabe for public view
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Abstract
Bentonite, a natural clay material, possesses multiple
applications within construction and engineering fields. Its ability
to increase strength, reduce permeability, and improve workability
makes it especially beneficial in concrete production. As a
lubricant in concrete mixtures, bentonite enables smoother textures
and enhanced ease of work. It also fortifies the bond between
cement and aggregate particles, resulting in a sturdier and longer -
lasting concrete blend. Various codes and standards dictate the
components required for bentonite mixtures. These ingredients
may differ based on regional codes and regulations but typically
include bentonite, sand, and water, as well as specific additives for
certain applications. With millions of tons of cement used in the
production of concrete releasing significant amounts of carbon
dioxide into the atmosphere, it is vital to explore cost-effective
and environmentally friendly alternatives to ordinary Portland
cement (OPC). The partial substitution of cement with pozzolanic
materials presents a sustainable approach within the construction
industry.
The objective of this study is to evaluate the properties of
bentonite mortar samples and bentonite concrete samples
comprised of different mix components. By analyzing laboratory
test results on mix workability through slump tests, compressive
strength tests, indirect tensile strength tests, and durability through
surptivity tests, this research pursues to explore the influences of
varying water, cement, and sand content within bentonite mortar
blends as well as the effects of dolomite-to-sand ratios in bentonite
concrete mixtures. Compressive strength at ages ranging from 3 to 365 days and indirect tensile strength at ages 7 and 28 days were
considered in this study.
Notable results include that the S8.0C3.5 mix displayed
superior mechanical durability properties among all cast mortar
mixes without incorporating superplasticizers and excellent fresh
properties. The highest 28-day compressive strength of all cast
bentonite mortar mixes reached 9.5 MPa using the S8.0C3.5 mix.
Furthermore, chosen dolomite content rat ios in the concrete
S8.0C3.5 mix ranged from 0.33 to 0.6 concerning total aggregate
content, with higher dolomite content correlating to improved
mechanical and durability properties. The optimal 28-day
compressive strengths of 22.5 MPa and 20.5 MPa were achieved in
D0.6 and D0.5 mixes, respectively, suggesting their suitability for
use in structural concrete elements, particularly pile foundation
work due to their inherent strength and durability characteristics.