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Effects of aluminosilicate minerals in clay soil fractions on pore water hydroxide ion concentrations in soil/cement matrices
a form of montmorillonite, with 0. 5, 10, 20, and 40 percent
a methodology to predict hydroxide ion concentrations in
accurately translate bench-scale test results to full-scale
adequately estimated assuming that montmorillonite reacts
air-dry soil. Pore water was expressed and analyzed for
aluminosilicate minerals in soils and portiandite or calcium
and sodium, may require up to 137 days to attain metastable
applications. Research on soil stabilization indicates that
appropriate for treatment of soils contaminated with metallic
bentonite by total, air-dry weight were mixed with Type I
calcium hydroxide. Pozzolanic reactions between
calcium:silicon ratios. Results indicate that pozzolanic
Cementitious solidification/stabilization processes are often
characteristics and, consequently, metal attenuation
characteristics of soiUcement/waste matrices is necessary to
constituents. However, thorough knowledge of potential
cured for various time periods up to about 280 days.
equilibrium. Composite calcium:silicon ratios can be
hydroxide, calcium, sodium, potassium, and silica. Pore
impacts of soil properties on solid and solution phase
matrices as a function of clay:cement ratio and 2) to develop
Mixtures of sand and commercially available sodium bentonite,
mixtures with a range of clay:cement ratios were cast and
montmorillonite/cement matrices by one unit when clay:cement
Portland cement at 10, 20, and 30 percent cement by weight of
possibly sorption of hydroxide ions onto low calcium:silicon
pozzolanic reactions can occur between clay minerals and
ratio calcium silicate hydrate in conjunction with potassium
ratios exceed 0.5. Pozzolanic reactions are nearly complete
reactions in soil/cement matrices, synthetic soil/cement
reactions reduce pore water pH levels in
significantly reduce the hydroxide ion concentration in
silicate hydrate, generated by cement hydration, may
soil/cement matrices. To assess effects of pozzolanic
soiUcement/waste matrices. Research described herein was
speciation model, to ascertain pH levels and composite solid
undertaken 1) to ascertain the pH decrement in soil/cement
water data were input to SOLTEQ-B, a chemical equilibrium
with portlandite and calcium silicate hydrate to a
within 32 days. However, a slow, ancillary reaction,
Issued also on microfiche from Lange Micrographics.
Includes bibliographical references: pages 43-47.