Strain-hardening cementitious composite
AssigneeKing Saud University
InventorsMohammad Iqbal Khan, Galal Fares, Shehab Eldin Mohamed Mourad, Wasim Abbass
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Abstract
A strain-hardening cementitious composite (SHCC) can include cement, fly ash (FA), dune sand (DS), and polyvinyl alcohol (PVA) fibers. The amount of DS in the SHCC can be at least 25% by weight. The cement can be Type I ordinary Portland cement, conforming to ASTM C150 specifications. The fly ash can be Class F fly ash (FA). The median particle size of the cement can be 14 μm. The median particle size of the FA can be 10 μm.
Claims9
A strain-hardening cementitious composite, comprising:
- cement;
- fly ash;
- dune sand, wherein the dune sand comprises between 80% to 90% quartz, between 10% and 20% feldspar and a median particle size of 200 μm;
- and
- polyvinyl alcohol fibers;
- wherein the strain-hardening cementitious composite includes at least 25% by weight dune sand.
A strain-hardening cementitious composite comprising:
- from about 22% to about 28% by weight cement;
- from about 28% to about 35% by weight fly ash;
- from about 25% to about 30% by weight dune sand, wherein the dune sand comprises between 80% to 90% quartz, between 10% and 20% feldspar and a median particle size of 200 μm;
- from about 1.0% to about 1.5% by weight polyvinyl alcohol microfibers;
- from about 0.1% to about 0.2% by weight super absorbent polymer;
- from about 0.1% to about 0.2% by weight viscosity modifying agent;
- from about 0.1% to about 0.4% by weight polycarboxylic ether superplasticizer;
- and
- from about 15% to about 20% by weight potable water.
A method of making a strain-hardening cementitious composite, comprising the steps of:
- mixing cement, fly ash, and dune sand to produce a homogenized mixture, wherein the dune sand comprises between 80% to 90% quartz, between 10% and 20% feldspar and a median particle size of 200 μm;
- mixing the homogenized mixture with potable water having a viscosity modifying agent and a super absorbent polymer to produce a second mixture;
- mixing the second mixture with polyvinyl alcohol fibers to produce a final mixture;
- and
- casting the final mixture into a mold.
Dependencies are inferred from the claim text.