Particle packed cement-SCM blends
AssigneeRoman Cement, LLC
InventorsJohn M. Guynn, Andrew S. Hansen
Life of this patent
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Abstract
Cement-SCM blends employ particle packing principles to increase particle packing density and reduce interstitial spacing between the cement and SCM particles. Particle packing reduces the amount of water required to obtain a cement paste having a desired flow, lowers the water-cementitious material ratio (w/cm), and increases early and long-term strengths. This may be accomplished by providing a hydraulic cement fraction having a narrow PSD and at least one SCM fraction having a mean particle size that differs from the mean particle size of the narrow PSD cement by a multiple of 3.0 or more to yield a cement-SCM blend having a particle packing density of at least 57.0%.
Claims20
A cement-(SCM) blend comprising:
- a narrow particle size distribution (PSD) hydraulic cement fraction having a PSD characterized by a lower PSD endpoint, median particle size, and upper PSD endpoint;
- and
- at least one supplementary cementitious material (SCM) fraction having a PSD characterized by a lower PSD endpoint, median particle size, and upper PSD endpoint that differ from the lower PSD endpoint, median particle size, and upper PSD endpoint of the hydraulic cement fraction in order for the cement-SCM blend, when initially mixed with water, to form a cement paste having a maximum particle packing density of at least 57.0%.
A cementitious composition comprising:
- a narrow particle size distribution (PSD) hydraulic cement fraction having a PSD characterized by a lower PSD endpoint, median particle size, and upper PSD endpoint;
- at least one supplementary cementitious material (SCM) fraction having a PSD characterized by a lower PSD endpoint, median particle size, and upper PSD endpoint that differ from the lower PSD endpoint, median particle size, and upper PSD endpoint of the hydraulic cement fraction in order for the hydraulic cement fraction and the at least one SCM fraction, when initially mixed with water, to form a cement paste having a maximum particle packing density of at least 57.0%;
- and
- at least one of fine aggregate, coarse aggregate, water, or chemical admixture.
Dependencies are inferred from the claim text.