Variation of Packing Densities and Liquid Film Thicknesses in Alkali Solution and Water in Natural Pozzolan Calcium Hydroxide Pastes and Mortars
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Date
2024-12-05
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MJRD F
Abstract
The characteristic properties of concrete depend on the quality of
mortar. In order to improve the properties of hardened concrete, the
mortar needs to have good performance. The property of mortar is
affected by wet packing density, liquid film thickness, type and quality
of binder, gradation of fine aggregates, and binder-to-fine-aggregate
ratio. The commonly used alkali solutions to produce polymer mortar and
concrete are cursed by carbon dioxide emissions. This study used alkali
solution and water to investigate the variation of packing densities and
film thicknesses on paste and mortar mixes. of natural pozzolan and
calcium hydroxide at a ratio of 75P25CH and standard sand. The
standard proctor compaction tools and procedures were adopted to
attain the maximum values of packing density of 0.937 for mortar mixed
with alkali solution, 0.919 for mortar mixed with water, 0.906 for paste
mixed with alkali solution, and 0.829 for paste mixed with water. For the
case of film thicknesses, the optimum values obtained were 0.548 μm
for mortar mixed with alkali solution, 0.248 μm for mortar mixed with
water, 0.398 μm for paste mixed with alkali solution, and 0.09 μm mixed
with water. The results indicate that alkali solution produced higher
packing density and liquid film thickness than water for both paste and
mortar, and the packing density and liquid film thickness increase with
the increase of the number of compacting blows with 9 blows to 36
blows. The study recommends the establishment of standard
compaction effort and procedure.
Description
This Journal Articles was Published at Mbeya University of Science and Technology