Self-compacting engineered cementitious composite
AssigneeThe Regents of the University of Michigan
InventorsVictor C. Li, Hyun-Joon Kong
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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.
Claims26
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).
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).
A method of making a composite structural material (engineered cementitious composite), said method comprising:
- 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).
Dependencies are inferred from the claim text.