Construction castable material with controllable flow or slump
Construction castable material with controllable flow or slump comprising (a) a binder comprising fly ashes comprising from 1.5% to 35% by weight of CaO and a Lost on Ignition (LOI) value from 0.5% to 5.5% by weight, representing from 10% to 60% of the binder weight and ground granulated blast furnace slag comprising from 40% to 70% by weight of CaO and from 30 to 60% by weight of SiO2, representing from 40% to 90% of the binder weight, (b) an activator comprising alkaline reagents selected from the group composed by water glass, preferably in solution with 30 to 50% by weight solid content, sodium metasilicates and sodium hydroxide, (c) sand, fine and coarse aggregates and (d) organic acids or conjugated salts of organic acids in a dosage from 0.001% to 3% by weight with respect to the binder.
1. A construction castable material with controllable flow or slump comprising
(a) a binder comprising
fly ashes comprising from 1.5% to 35% by weight of CaO and a Lost on Ignition (LOI) value from 0.5% to 5.5% by weight, representing from 10% to 60% of the binder weight,
and
ground granulated blast furnace slag comprising from 40% to 70% by weight of CaO and from 30 to 60% by weight of SiO2, representing from 40% to 90% of the binder weight;
(b) an activator mix comprising alkaline reagents composed by water glass, sodium metasilicates and sodium hydroxide, wherein a solid active content of sodium metasilicates and sodium hydroxide in the activator mix is in the range of 2.5:1 and 0.5:1, respectively;
(c) sand, fine and coarse aggregates, water; and
(d) organic acids or conjugated salts of organic acids in a dosage from 0.001% to 3% by weight with respect to the binder, the organic acid is tartaric acid, aldaric acid, or maleic acid;
wherein a ratio between a solid active content of said activator mix to the total binder content is between 4.5 weight % and 8 weight %; and
wherein the construction castable material with controllable flow provides a consistency of concrete slump of class between S3 and S5 and/or consistency of concrete flow of class between F4 and F6, and a workability retention time of from 30 minutes to 150 minutes.
2. The construction castable material according to claim 1 , wherein the binder in (a) comprises pozzolanas.
3. The construction castable material according to claim 1 , wherein said sodium metasilicates are pentahydrate sodium metasilicates.
4. The construction castable material according to claim 1 , wherein (d) further comprises Polycarboxylate Ether Polymers (PCE).
5. The construction castable material according to claim 4 , wherein the concentration range of said Polycarboxylate Ether Polymers is from 0.12% to 0.75% by weight of binder.
6. The construction castable material according to claim 1 , wherein in (b) the alkaline reagents composed by water glass is in a solution with 30 to 50% by weight solid content.
7. The construction castable material according to claim 1 , wherein the binder in (a) further comprises natural fibers, metallic fibers or polymeric fibers.
8. The construction castable material according to claim 1 , wherein the binder in (a) further comprises alkali content, silica fumes, fillers or limestone.