Process for the preparation of cement, mortars, concrete compositions containing a calcium carbonate—based filler (pre)—treated with a superplasticizer, compositions and cement products obtained and their applications
The invention concerns a PROCESS for the preparation of cement/mortar/concrete (for simplicity: “cement”) compositions or systems, (hereafter “cement” compositions or systems for simplicity), of a general known type, in which the filler(s) is/are comprising or consist of “calcium carbonate-based filler(s)”, comprising at least one step where the said filler(s) is/are treated with an efficient treating amount of at least one treating agent consisting of or comprising superplastifier(s). The main purpose of this invention is to build a process aimed at providing improved, “High performance”, FLUID, cement or mortars or concrete systems or compositions having an improved compacity, an improved flowability, and globally speaking a definitely improved “workability”, and “regularity” of the properties of the final systems. The present invention also concerns a filler for “cement” compositions, characterized in that if consists of, or comprises, a calcium-carbonate-based filler or blends of same, pre-treated with an “efficient amount” of at least one superplastifier.
1. A cement composition comprising (i) cement, (ii) calcium carbonate surface treated with 0.02 to 0.15 wt. %, based on the dry weight of the cement composition, of a treatment agent comprising at least one superplasticizer and at least one plasticizer, wherein the ratio of the superplasticizer and the plasticizer is from 95/5 to 85/15 on a dry weight basis, and wherein the calcium carbonate is surface treated with the treatment agent before being introduced into the cement composition, and (iii) optionally one or more of an aggregate, sand, gravel, a hydraulic binder, an air entrainment agent, a setting retarder, a setting accelerator, an anti-foam agent, an adjuvant, a fluidifier and water.
2. The cement composition according to claim 1 , wherein the calcium carbonate is calcium carbonate, ground calcium carbonate, precipitated calcium carbonate or a blend of ground calcium carbonate and precipitated calcium carbonate.
3. The cement composition according to claim 1 , wherein the superplasticizer is selected from the group consisting of a polycarboxylate, a polycarboxylate ether, a sulfonated naphthalene condensate, and a sulfonated melamine formaldehyde.
4. The cement composition according to claim 1 , wherein the superplasticizer is a polycarboxylate or a polycarboxylate ether.
5. The cement composition according to claim 1 , wherein at least 80% of the surface of particles of calcium carbonate is covered with the at least one superplasticizer.
6. The process according to claim 1 , wherein at least 90% of the surface of particles of calcium carbonate is covered with the at least one superplasticizer.
7. The cement composition according to claim 1 , wherein 100% of the surface of particles of calcium carbonate is covered with the at least one superplasticizer and the plasticizer.
8. The cement composition according to claim 1 , containing 0.3 to 3 kg of the at least one superplasticizer per 100 kg of the cement composition.
9. The cement composition according to claim 1 , containing 0.8 to 1.2 kg of the at least one superplasticizer per 100 kg of the cement composition.
10. The cement composition according to claim 1 , further comprising an aggregate, a hydraulic binder, an air entrainment agent, a setting retarder, a setting accelerator, an anti-foam agent, an adjuvant, and a fluidifier.
11. The cement composition according to claim 1 , further comprising an aggregate, a hydraulic binder, an air entrainment agent, a setting retarder, a setting accelerator, an anti-foam agent, an adjuvant, a fluidifier, and water.
12. The cement composition according to claim 1 , further comprising an aggregate, sand, a hydraulic binder, an air entrainment agent, a setting retarder, a setting accelerator, an anti-foam agent, an adjuvant, and a fluidifier.
13. The cement composition according to claim 1 , further comprising an aggregate, sand, a hydraulic binder, an air entrainment agent, a setting retarder, a setting accelerator, an anti-foam agent, an adjuvant, a fluidifier and water.
14. The cement composition according to claim 1 , further comprising an aggregate, sand, gravel, a hydraulic binder, an air entrainment agent, a setting retarder, a setting accelerator, an anti-foam agent, an adjuvant, and a fluidifier.
15. The cement composition according to claim 1 , further comprising an aggregate, sand, gravel, a hydraulic binder, an air entrainment agent, a setting retarder, a setting accelerator, an anti-foam agent, an adjuvant, a fluidifier and water.
16. The cement composition according to claim 2 , further comprising an aggregate, a hydraulic binder, an air entrainment agent, a setting retarder, a setting accelerator, an anti-foam agent, an adjuvant, and a fluidifier.
17. The cement composition according to claim 2 , further comprising an aggregate, a hydraulic binder, an air entrainment agent, a setting retarder, a setting accelerator, an anti-foam agent, an adjuvant, a fluidifier, and water.