HIGHLY WORKABLE CONCRETE COMPOSITIONS HAVING MINIMAL BLEEDING AND SEGREGATION
First Claim
1. A fresh concrete composition having high workability with relatively reduced segregation or bleeding, comprising:
- hydraulic cement;
water;
fine aggregate having a volume in a first range between about 45% to about 65% of total aggregate volume; and
coarse aggregate having a volume in a second range between about 35% to about 55% of the total aggregate volume,the concrete composition having a slump of at least 1 inch and a 28-day compressive strength after curing of at least 1500 psi,the concrete composition having lower viscosity and greater cohesiveness compared to a concrete composition having a volume of fine aggregate immediately less than the first range and a volume of coarse aggregate immediately greater than the second range.
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Abstract
Concrete compositions have a fine-to-coarse aggregate ratio optimized for increased workability with minimal segregation and bleeding. The concrete compositions include at least water, cement, coarse aggregate, and fine aggregate and have a slump of at least 1 inch and a 28-day compressive strength of at least about 1500 psi. Workability is improved by minimizing the viscosity as a function of the aggregate content, while minimizing segregation and bleeding. To improve workability, the concrete compositions include between 45% and 65% fine aggregate and between 35% and 55% coarse aggregate as a function of total aggregate volume. For relatively low strength concrete (1500-4500 psi), the fine aggregate is 55-65% of the total aggregate volume. For medium strength concrete (4500-8000 psi), the fine aggregate is 50-60% of the total aggregate volume. For high strength concrete (>8000 psi), the fine aggregate is 45-55% of the total aggregate volume. Overall workability can be maintained or improved even if slump is decreased.
36 Citations
27 Claims
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1. A fresh concrete composition having high workability with relatively reduced segregation or bleeding, comprising:
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hydraulic cement; water; fine aggregate having a volume in a first range between about 45% to about 65% of total aggregate volume; and coarse aggregate having a volume in a second range between about 35% to about 55% of the total aggregate volume, the concrete composition having a slump of at least 1 inch and a 28-day compressive strength after curing of at least 1500 psi, the concrete composition having lower viscosity and greater cohesiveness compared to a concrete composition having a volume of fine aggregate immediately less than the first range and a volume of coarse aggregate immediately greater than the second range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A fresh concrete composition having high workability with relatively reduced segregation or bleeding, comprising:
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hydraulic cement; water; fine aggregate having a volume in a first range of about 55% to about 65% of total aggregate volume; and coarse aggregate having a volume in a second range of about 35% to about 45% of the total aggregate volume, the concrete composition having a slump in a range of about 1 inch to about 12 inches, as measured using a 12 inch slump cone according to ASTM C143, and a 28-day compressive strength after curing in a range of about 1500 psi to about 4500 psi, the concrete composition having lower viscosity and greater cohesiveness compared to a concrete composition having a volume of fine aggregate immediately less than the first range and a volume of coarse aggregate immediately greater than the second range.
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19. A fresh concrete composition having high workability with relatively reduced segregation or bleeding, comprising:
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hydraulic cement; water; fine aggregate having a volume greater than 50% and less than 60% of total aggregate volume; and coarse aggregate having a volume greater than 40% and less than 50% of the total aggregate volume, the concrete composition having a slump in a range of about 1 inch to about 12 inches, as measured using a 12 inch slump cone according to ASTM C143, and a 28-day compressive strength after curing in a range of about 4500 psi to about 8000 psi, the concrete composition having a lower viscosity, segregation and bleeding compared to a concrete composition having a volume of fine aggregate immediately less than 50% of total aggregate volume and a volume of coarse aggregate immediately greater than 50% of total aggregate volume.
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20. A fresh concrete composition having high workability with relatively reduced segregation or bleeding, comprising:
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hydraulic cement; water; fine aggregate having a volume in first a range of about 45% to about 55% of total aggregate volume; and coarse aggregate having a volume in a second range of about 45% to about 55% of the total aggregate volume, the concrete composition having a slump in a range of about 1 inch to about 12 inches, as measured using a 12 inch slump cone according to ASTM C143, and a 28-day compressive strength after curing of at least about 8000 psi, the concrete composition having lower viscosity and greater cohesiveness compared to a concrete composition having a volume of fine aggregate immediately less than the first range and a volume of coarse aggregate immediately greater than the second range.
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21. A method for designing a concrete composition having high workability with relatively reduced segregation or bleeding, comprising:
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designing a cement paste having a desired water-to-cement ratio for achieving a desired strength greater than about 1500 psi after curing; selecting relative amounts of fine aggregate and coarse aggregate that minimize segregation and bleeding and result in a desired workability; and determining a volume of cement paste relative to the overall volume of aggregate that will yield concrete having the desired strength, the desired workability, and a slump in a range about 1 inch to about 12 inches, as measured using a 12 inch slump cone according to ASTM C143. - View Dependent Claims (22, 23, 24, 25)
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26. A method for manufacturing ready-mix concrete having relatively reduced segregation or bleeding, comprising:
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providing a batching plant having a batching system capable of dispensing and mixing together desired amounts of cement, water, fine aggregate and coarse aggregate; forming a fresh concrete composition by mixing together in the batching system a measured quantity of; hydraulic cement; water; fine aggregate in a range of about 45% to about 65% by volume of total aggregate; and coarse aggregate in a range of about 35% to about 55% by volume of the total aggregate, the fresh concrete composition having a slump of at least about 1 inch and a 28-day compressive strength after curing of at least about 1500 psi. - View Dependent Claims (27)
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Specification