TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The process comprises: (a) providing a powder of at least a dry calcium carbonate-based filler; (b) mixing the filler(s) with at least an aluminosiliceous material; (c) treating by mixing the resulting fillers blend with an efficient treating amount of at least one superplastifier, thus producing treated fillers blend; (d) introducing the treated fillers blend into a kneading or mixing device already containing mixing water or a composition of mixing water possibly containing routine or non-interfering additives; (e) optionally adding before or after the step (c), preferably before, aggregates such as sand and/or gravel, and possibly other non interfering routine additives or adjuvants; (f) kneading or mixing the load during an efficient period of time; and (g) recovering the cement composition. The process contains a step where a small amount of fluidifier is introduced in the mixing/kneading device. The filler(s) blend is/are efficiently treated with the superplastifier(s) before being introduced in the kneading or mixing device, such as in an outside mixing laboratory equipment or in an industrial mixer or other industrial kneading or mixing equipment. The filler(s) blend is/are treated after having being introduced in the kneading or mixing device (inside treatment), where the filler(s) blend is/are efficiently treated with the superplastifier(s) after having being introduced in the kneading or mixing device with the filler(s) blend and the efficient treating amount of the superplastifier treating agent(s), being introduced in the kneading or mixing device either simultaneously or in a manner such that the filler(s) and the efficient amount of the superplastifier treating agent(s) are introduced separately but at a very close location and time. The filler(s) blend is/are efficiently treated with the superplastifier(s) partially before being introduced in the kneading or mixing device (partial pre-treatment) and partially after having been introduced in the pre-treated state in the mixing or kneading device, where the total of the two partial treatments with superplastifier(s) being efficient, with the second part or amount of the superplastifier(s) treating agent(s) being introduced in the kneading or mixing device either simultaneously with the pre-treated fillers blend or in a manner such that the pretreated filler(s) blend and the second part of the treating agent(s) are introduced separately but at a very close location and time. The filler(s) blend is/are to be treated at least partially inside the kneading or mixing device, (mixed treatment), where a corresponding amount or proportion of treating superplastifier(s) is added directly into the kneading or mixing device or in mixture with the considered filler(s) blend just before the introduction into the kneading or mixing device, for example, on the weighting device (balance) which is provided just before the powdered products are introduced into the kneading or mixing device. The point and time of introduction of the proportion of superplastifier(s) treating agent is as close as possible to the point and time of introduction of the partially treated filler(s) blend. The efficient period of time is a total period of time leading to a homogeneous mixture or blend, in the order of 2-15 minutes, preferably, for the standard mixtures or blends, 30-60 seconds, or 35-65 seconds or a much longer time of 1-3 to 10-15 minutes. The process comprises first introducing the aggregates such as sand and gravel into the kneading or mixing device, and mixing them optionally with a small amount of water and/or of fluidifier, before performing the other steps. The total efficient time of mixing/kneading consists of a kneading time of 10-15-20 seconds for the aggregates such as gravel and sand (dry kneading or mixing), then of 10 seconds for the kneading or mixing of the hydraulic binder of the cement composition and untreated filler(s) blend, then 10-15 seconds for the kneading or mixing of the fillers blend and hydraulic binder with the fluidifier treatment agent(s) and mix water, then 5-15 seconds for the final kneading or mixing with routine additives. The mixing or kneading device is operated in a batch mode, a semi-continuous mode, or a continuous mode. The product comprises the carbonate-based filler and the aluminosiliceous material, which provides the fillers blend and the fillers blend has been treated with an efficient amount of the superplastifier. Preferred Components: The dosage of the alumino-siliceous (SiO2/Al2O3) material is 8.5-100 wt.% dry weight of carbonate-based filler(s), preferably 30-35- 40 wt.%. The dosage of the alumino-siliceous material is 25-75%, preferably 50 wt.%. The aluminosiliceous material is a silica fume having d50 of 1.2 microns, blaine surface of greater than 1500 m2/kg, brunauer-emmett-teller (BET) of 16 m2/g. The superplastifier comprises polycarboxylates, polycarboxylate ethers (preferred), or products manufactured from sulfonated naphthalene condensate or sulfonated melamine formaldehyde. The dosage in superplastifier(s) is present at 0.03 or 0.05-0.1% to 2-3% dry weight of cement, or 0.3-2-3 kg for 100 kg of cement, preferably 0.8-1.2 kg/100 kg of cement, on a dry/dry basis or, in laboratory conditions, having 0.05-0.1 wt.% of the carbonate (dry) i.e. 0.1-0.3 kg/100 kg of cement, on a dry/dry basis. The superplastifier treating agent(s) is superplastifier(s) or blends of superplastifier(s) with non-interfering plasticizer(s) and/or inert, additives. The ratio of superplastifier(s)/plasticizer(s) is 100/0 to 95/5-90/10, preferably greater than 85/15 on a weight dry basis. The calcium carbonate-based filler(s) are fillers that contains only calcium carbonate from various origins, such as various natural rocks or various PCGs with no other filler of a different type, such as kaolin, bentonite, etc, and is/are preferably provided (when the filler(s) is/are GCC(s)) by a carbonated rock or more generally mineral material(s) comprising at least 50-65 wt.% of calcium carbonate, preferably 90 wt.%. The carbonate-based fillers are: natural calcium carbonate or ground calcium carbonate (GCC(s)) such as GCC from marble, chalk, calcite, or from other natural forms of natural calcium carbonates; PCC(s), which is a precipitated calcium carbonate; or a mixture of the calcium carbonate containing rocks or mineral materials and blends or mixtures of GCC(s) and/or PCC(s) and/or MCC(s) and blends of MCC(s) and GCC(s) and/or PCC(s). The GCC/PCC ratio is 0-100-100-0 wt.%, preferably 30-70-70/30 wt.%. The carbonate-based filler(s) is ultrafine filler(s) or coarser or coarse filler(s). The ultrafines particles has a d50 of 1-6 microns, preferably 2-3 microns, usually less than 5 microns and a high specific surface area (BLAINE) of greater than 1000 m2/kg, preferably 2000 m2/kg (or a corresponding BET or SSP m2/g), while coarse carbonate-based fillers have a d50 of 5-6 microns and a Blaine surface of less than 1000 m2/kg. The ultrafines particles comprise calcites (d50 of 1 micron), marbles (d50 of 3 microns), or marbles of (1 to 5-6 microns d50), a carbonate of clay type (d50 of 2 microns), a carbonate of marble (d50 of 2.4 micron), PCCs (d50 of 1.52 mu m), MCCs (d50 of 2.29 mu m). The aluminosiliceous material is a product or blend of products mainly made of siliceous product(s) and/or aluminous product(s) which may contain only a minor amount of non aluminosiliceous products, such as impurities, and are preferably aluminum oxides of various forms, silica fumes of various forms such as silicon dioxide (SiO2), calcined kaolin or metakaolin, pozzolanic products (used by cement industry) such as blast furnace slags, ultrafine siliceous products from the industry, and blends of Al2O3/SiO2. The aluminosiliceous material is: a product containing 98% of SiO2 and a minor amount of 0.71% of aluminum oxide (Al2O3), and traces of calcium oxide and magnesium oxide (having SSP of 7.49 and median diameter (d50) of 1.86 micron); a product which is a silica fume obtained while preparing silicium with d50 of 1.2 micron, Blaine of greater than 1600 m2/kg, and BET of 16 m2/g; a metakaolin with d50 of 3 microns and BET of 3.8 m2/g; and a product with d50 of 14 microns and BET of 6.12 m2/g. The carbonate-based filler(s) comprises at least coarse carbonate-based filler, and/or at least an ultrafine filler. The fillers consist of calcium carbonate(s), where the filler(s) are made of calcium carbonate(s) or its blends, that are GCCs or PCCs or blends of GCCs or blends of PCCs or blends of GCCs and PCCs, optionally mixed with non interfering fillers. The coarse carbonate-based fillers can be low, medium or high performance (HP) fillers, and ultrafine filler(s). The fluidifier is a modified polycarboxylate. The dosage of the fluidifier is 3-4 g, preferably 3.5 g/dry weight of the total cement composition. The fillers preblend material comprises 35 wt.% of alumino-siliceous material and 65 wt.% of filler. The product comprises carbonate-based filler and aluminosiliceous material, which provides a fillers blend, where the fillers blend has been treated with an efficient amount of at least the superplastifier, and optionally at least a plastifier and optionally a fluidifier, further contains additives such as air entrapment agents, setting retarders or accelerators. EXAMPLE - No suitable example given.