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 process for preparing a cement composition comprising introducing during the manufacture of a cement composition a filler comprising calcium carbonate surface treated with 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.
2. The process according to claim 1 , wherein the calcium carbonate filler is calcium carbonate, ground calcium carbonate, precipitated calcium carbonate or a blend of ground calcium carbonate and precipitated calcium carbonate.
3. The process 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 process according to claim 1 , wherein the superplasticizer is a polycarboxylate or a polycarboxylate ether.
5. The process 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 process 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 process according to claim 1 , wherein the cement composition contains 0.3 to 3 kg of the at least one superplasticizer per 100 kg of the cement composition.
9. The process according to claim 1 , wherein the cement composition contains 0.8 to 1.2 kg of the at least one superplasticizer per 100 kg of the cement composition.
10. The process according to claim 1 , wherein the calcium carbonate is treated with 0.05 to 0.1% by weight of the superplasticizer based on the dry weight of the calcium carbonate.
11. The process according to claim 1 , wherein the cement composition contains 0.02 to 0.05% by weight of the superplasticizer based on the dry weight of the cement composition.
12. The process according to claim 1 , wherein the cement composition contains 0.08 to 0.15% by weight of the superplasticizer based on the dry weight of the cement composition.
13. The process according to claim 1 , wherein the cement composition comprises a calcium carbonate filler treated with at least one superplasticizer and at least one plasticizer, an aggregate, a hydraulic binder, an air entrainment agent, a setting retarder, a setting accelerator, an anti-foam agent, an adjuvant, and a fluidifier.
14. The process according to claim 1 , wherein the cement composition comprises a calcium carbonate filler treated with at least one superplasticizer and at least one plasticizer, 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.
15. The process according to claim 1 , wherein the cement composition comprises a calcium carbonate filler treated with at least one superplasticizer and at least one plasticizer, 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.
16. The process according to claim 1 , wherein the cement composition comprises a calcium carbonate filler treated with at least one superplasticizer and at least one plasticizer, 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.
17. The process according to claim 1 , wherein the cement composition comprises a calcium carbonate filler treated with at least one superplasticizer and at least one plasticizer, 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.
18. The process according to claim 1 , wherein the cement composition comprises a calcium carbonate filler treated with at least one superplasticizer and at least one plasticizer, 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.
19. The process according to claim 1 , wherein the cement composition comprises a calcium carbonate filler treated with at least one superplasticizer and at least one plasticizer, an aggregate, a hydraulic binder, an air entrainment agent, a setting retarder, a setting accelerator, an anti-foam agent, an adjuvant, a fluidifier, and optionally a superplasticizer and/or a plasticizer.
20. The process according to claim 1 , wherein the cement composition comprises a calcium carbonate filler treated with at least one superplasticizer and at least one plasticizer, 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, and optionally a superplasticizer and/or a plasticizer.