Self-compacting engineered cementitious composite
First Claim
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1. A self-compacting, fiber-reinforced engineered cementitious composite comprising:
- cementitious material comprising;
cement and sand;
at least one polymeric thickener;
at least one superplasticizer; and
water; and
from 0.5 to 10 volume % of hydrophilic reinforcing fibers having a modulus (E) of about 35-50 GPa and a percent elongation of about 3-20%;
wherein the hydrophilic fibers are coated with an oiling agent comprising poly(oxymethylene).
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Abstract
Short fiber-reinforced engineering cementitious composites which are self-compacting, can be prepared by adding hydrophilic polymer fibers to a cement composition containing polymeric thickener and superplasticizer. The compositions are exceptionally ductile and exhibit many of the physical characteristics previously available only with hydrophobic high performance polyethylene fibers.
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Citations
26 Claims
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1. A self-compacting, fiber-reinforced engineered cementitious composite comprising:
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cementitious material comprising;
cement and sand;
at least one polymeric thickener;
at least one superplasticizer; and
water; and
from 0.5 to 10 volume % of hydrophilic reinforcing fibers having a modulus (E) of about 35-50 GPa and a percent elongation of about 3-20%;
wherein the hydrophilic fibers are coated with an oiling agent comprising poly(oxymethylene).- View Dependent Claims (2, 3, 4, 5, 6, 7, 23, 24, 25, 26)
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8. A method of making a composite structural material (engineered cementitious composite), said method comprising:
mixing from 0.5 to 10 volume % of hydrophilic reinforcing fibers having a modulus (E) of about 35-50 GPa and a percent elongation of about 3-20% with cementitious material comprising cement and sand, at least one polymeric thickener, at least one superplasticizer, and water, wherein the hydrophilic fibers are coated with an oiling agent comprising poly(oxymethylene). - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of making a composite structural material (engineered cementitious composite), said method comprising:
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1) mixing powders of dry cement, sand, fly ash and defoamer;
2) mixing the dry powder mixture of
1) with water;
3) mixing an aqueous solution of cellulose compound with the mixture of
2);
4) mixing an aqueous solution of superplasticizer with the mixture of
3); and
5) mixing hydrophilic fibers having a modulus (E) of about 35-50 GPa and a percent elongation of about 3-20% with the mixture of
4), wherein the hydrophilic fibers are coated with an oiling agent comprising poly(oxymethylene).- View Dependent Claims (18, 19, 20, 21, 22)
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Specification