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 hydraulic cement fraction having a median particle size;
- and
- at least one supplementary cementitious material (SCM) fraction having a median particle size that differs from the median particle size 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 mixture products of:
- a hydraulic cement fraction having a median particle size;
- at least one supplementary cementitious material (SCM) fraction having a median particle size that differs from the median particle size 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%;
- and
- at least one of fine aggregate, coarse aggregate, water, or chemical admixture.
A method of manufacturing a cement-SCM blend comprising:
- providing a hydraulic cement characterized by a median particle size;
- blending the hydraulic cement with at least one supplementary cementitious material (SCM) having a median particle size that differs from the median particle size of the hydraulic cement 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%.
Dependencies are inferred from the claim text.