Thermally adaptive ductile concrete
First Claim
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1. A fiber-reinforced cementitious composite comprising:
- a binder of cement, class F fly ash, and water;
a plurality of uniformly distributed oil-coated polyvinyl alcohol (PVA) or polyethylene (PE) fibers at 1.5% to 3% of the total volume;
a sand with average diameter of about 100 microns;
a microencapsulated paraffin wax that changes a state of matter at a temperature between 18 and 26 degrees Celsius; and
a water reducing admixture in sufficient quantity to obtain a mini-cone flow rate of a pre-cured fiberless matrix of the fiber-reinforced cementitious composite between 24 and 33 seconds,wherein said composite having an ultimate tensile strength of at least 4 MPa and exhibiting a compressive strength of about 28 MPa.
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Abstract
A Thermally Adaptive Ductile Concrete (PCM-ECC) having a tensile ductility ceramic with 5 times the thermal resistance, 2 times the specific heat capacity, and 400 times the tensile strain capacity of regular concrete.
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Citations
15 Claims
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1. A fiber-reinforced cementitious composite comprising:
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a binder of cement, class F fly ash, and water; a plurality of uniformly distributed oil-coated polyvinyl alcohol (PVA) or polyethylene (PE) fibers at 1.5% to 3% of the total volume; a sand with average diameter of about 100 microns; a microencapsulated paraffin wax that changes a state of matter at a temperature between 18 and 26 degrees Celsius; and a water reducing admixture in sufficient quantity to obtain a mini-cone flow rate of a pre-cured fiberless matrix of the fiber-reinforced cementitious composite between 24 and 33 seconds, wherein said composite having an ultimate tensile strength of at least 4 MPa and exhibiting a compressive strength of about 28 MPa. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification