Key parameters for strength control of rammed sand–cement mixtures: Influence of types of portland cement

The present research aims to quantify the influence of distinct types of Portland cement, amounts of
cement, porosity, curing time period and porosity/cement ratio in the assessment of unconfined compressive
strength (qu) of rammed sand–cement mixtures. A program of unconfined compression tests
considering distinct types of Portland cement (types I, III and IV), porosities (g), cement contents (C)
and curing time periods (t) was carried out in the present study. It was found that a ratio between porosity
and cement [(g/Civ)1.5] applies to all equations that control the strength of blends (for the curing periods
and cement types studied here). The qu values of the specimens moulded for each cement type and
curing period were also normalize (i.e. divided by the qu attained by a specimen with porosity/cement
ratio equals to 20). It was found that a single power function adapts well to the normalized values for
all the cement type and curing period studied. From a practical viewpoint, this means that carrying
out only one (1) compression test with a specimen moulded with a specific cement time and cured for
a given time period, allows the equation that controls the strength for distinct porosity and cement content
to be determined.

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