依據本發明之生產低量水泥混凝土的方法係採用此一途徑：於第一步驟，在漿液混合器中將一配比的礦物質與一配比的塑化劑懸浮於一配比的水中，而提供黏合劑懸浮液，該礦物質包含水泥及至少一種水泥替代物。同時，較佳地，尺寸小於0.125 mm之粒子可含在礦物質內容物中。於依據本發明之方法的第二步驟，提供一配比的骨材，其中尺寸小於0.125 mm之粒子的百分比係少於10%且較佳少於5%。於第三步驟，將該配比的骨材與該配比的黏合劑懸浮液混合。 為了更佳理解，尺寸小於0.125 mm之粒子的百分比於本發明之內文中可採用細料含量(fine content)或細料粒子含量指明。意外地，已證實可按照依據本發明之方法提供低量水泥及低量水混凝土並同時使用具有少於10%細料內容物之骨材，亦即具有少於10%的尺寸小於0.125 mm之粒子。 對於在所定義條件下分開提供之黏合劑懸浮液而言，其於混合期間由於骨材中不存在這些細料內容物而不受額外細料粒子汙染而使得黏合劑懸浮液作為用以鍵結骨材粒子之膠水的功能不受影響。 有利地，因此可提供低量水泥新拌混凝土，其具有增進之流動能力，並因此在不必向混合料添加額外的水下有增加之坍-流量度(slump-flow measure)及流擴展度(flow spread)。 礦物質內容物，其係形成自一配比的水泥及至少一配比的水泥替代物，較佳地僅具有尺寸小於0.125 mm之粒子。根據有利之依據本發明方法之具體實施例，具有尺寸小於0.125 mm之粒子的砂及/或礫石細料內容物可用來作為水泥替代物，其中所用砂及/或礫石係於第二製程步驟提供作為骨材。 礦物質內容物(根據依據本發明方法的具體實施例其可僅具有尺寸小於0.125 mm之粒子)的分開懸浮混合係確保於第一製程步驟中，生成的混合料中所含有之粒子充分暴露於水，且於該製程中，粒子周圍可能會形成一層水。有利地，結果可避免凝集(agglutination)及凝聚 (agglomeration)，而使得提供了特別均質的黏合劑懸浮液。透過骨材中不存在細料粒子內容物，黏合劑懸浮液於第三步驟與粗糙元件的表面直接接觸，並在黏合劑懸浮液的特徵不受到額外的細料內容物的影響下將它們彼此鍵結。 透過在漿液混合器中依據本發明來加工所有細料粒子，可在所得混凝土混合料中達成水/細料粒子內容物之比或水/粉狀內容物之比減少。已證實以此方式生產之低量水泥及低量水混凝土具有較高最終強度且彼等之性質也更有持續性。 儘管傳統混凝土生產方法與依據本發明之懸浮液混凝土方法相比，混凝土調配物的所得總混合物中所含之尺寸小於0.125 mm之粒子的細料內容物比可在數量上相同，透過在漿液混合器中分開加工所有細料粒子，可達成新拌混凝土性質的顯著改善。 關於按照依據本發明之方法所生產之混凝土的用途，基本上沒有限制。故而，按照依據本發明之方法所生產之混凝土係適於作為預拌(ready-mixed)混凝土或作為生產預製(precast)混凝土組件的混凝土。便利地，按照依據本發明之方法所製造之混凝土可用來作為預拌混凝土。此外，也可提供混凝土混合料，其尤其適合用於製造預製混凝土組件。 有利地，依據本發明之方法可根據複式混凝土混合技術實施，其中黏合劑懸浮液(其也可以被稱為膠水組分)係於第一步驟中在限定的條件下在分開的漿料混合器中生產。同時，於該漿液混合器中，礦物質內含物係吸收於水中並藉由施用高剪力而混合。較佳對黏合劑懸浮液提供大於600 RPM之攪拌元件的攪拌速度。已證明在600 RPM至1600 RPM之範圍的攪拌速度特別有利。 接著將以此方式生產之黏合劑懸浮液或膠水組分與骨材(等)於傳統混合器中組合並混合成均質流體混凝土混合料。 由於它們的高度可得性，粉狀岩石，較佳粉狀石灰石可用來作為水泥替代物。然而，可以規定使用粒子尺寸小於0.125 mm之白雲石、鼓風爐砂(blast-furnace sand)、飛灰、矽灰(silica fume)及/或細砂。此外，還可以在礦物質內容物中使用多個且不同的惰性及/或反應性添加劑，諸如浮石凝灰岩(trass)、飛灰或矽灰。 根據依據本發明之方法的較佳設計變化，1 mm至8 mm顆粒尺寸之砂及/或礫石可用來作為骨材。然而，可以規定使用較大顆粒尺寸之砂或礫石。依據本發明，砂或礫石係用來作為骨材，其中尺寸小於0.125 mm之粒子的百分比少於10%且較佳少於5%。 為了生產較佳混凝土混合料，水與水泥可以小於0.6之比使用，其中係維持小於0.45的水與礦物質內容物之比。在這方面，水與水泥比的數值是水含量與水泥含量的商數。水與礦物質內容物比的數值涉及水含量與礦物質含量的商數。 由於替代了礦物質內容物中的水泥內容物，少於300 kg/m3
且較佳少於250 kg/m3
之減少的水泥含量可用在混凝土混合料方面。在依據本發明之方法的有利具體實施例中，水泥及水泥替代物可以相等比(亦即以相同配比)使用。這樣做時，通常水泥含量的一半被水泥替代物替換。於此情況下，水泥與水泥替代物之比的商數為1.0。故而，可提供混凝土混合料，其符合就二氧化碳排放限值而言的法定要求。 骨材，諸如砂或礫石，通常含有範圍在0 mm至4 mm之顆粒譜(grain spectrum)的細料內容物(粒子尺寸小於0.125 mm之內容物)。於傳統製造期間(現有技術的狀態)，這些細料內容物與水泥一起或甚至連同其他添加劑(諸如鼓風爐砂、粉狀岩石或飛灰)形成混凝土混合料中的膠水組分(其係在混凝土混合料中發展作為固體基質)。為此，骨材中的細料內容物，特別是粒子尺寸小於0.125 mm之內容物必需分配到黏合劑膠水或膠水組分，因為它們作為載體物質或連同混凝土混合料中的水泥及其他添加劑作為大於1.0 mm之較大顆粒部分的黏合劑膠水。 因此，根據依據本發明之方法的有利具體實施例，可以規定該配比的骨材係藉由過濾塊材(bulk material)來提供。同時，經過濾細料內容物，所謂的具有粒子尺寸小於0.125 mm之篩底，可用來作為第一步驟之水泥替代物。例如，具有高達1 mm孔尺寸的振動篩可用來過濾塊材(砂或礫石)。也可以規定執行各種孔尺寸之多重過濾步驟來提供骨材，以茲達成具有不同粒子尺寸之篩份。有利地，透過過濾提供骨材可作為於第一製程步驟前之準備步驟或作為中間步驟執行。 藉由提供具有粒子尺寸小於0.125 mm之篩底作為第一製程步驟之水泥替代物，實施了特別環保的解決方案，從邏輯端點來看，通過此特別地可將水泥替代物切回。 本發明也包含一種低量水泥混凝土，其係按照依據本發明之方法製造。依據本發明，低量水泥混凝土係一比之黏合劑懸浮液與一配比的骨材之混合物，該黏合劑懸浮液由各配比之水、礦物質及塑化劑所組成，該礦物質包含水泥及至少一種水泥替代物，其中骨材中尺寸小於0.125 mm之粒子的百分比係少於10%且較佳少於5%。 水泥替代物可選自由具有粒子尺寸小於0.125 mm之粉狀石灰石、白雲石、鼓風爐砂、飛灰、矽灰及細砂所組成群組。有利地，細砂為來自骨材之經過濾細料內容物。使用合適之水泥替代物具有的優點是可減少依據本發明之混凝土的水泥含量，其中同時地可維持所要求之混凝土的技術性質或加工性質。 若確保骨材中細料內容物係少於10%且較佳少於5%，原則上可使用具有不同粒子尺寸之骨材。根據依據本發明之混凝土的變化形，骨材可為砂及/或礫石且具有1 mm或更大之顆粒尺寸。 再者，可使用不同塑化劑，其中塑化劑可具有2 kg/m3
之最小含量。 藉由改變礦物質內容物的比，可影響混凝土混合料的技術性質。因此，於依據本發明之混凝土的較佳變化形中，可以規定以小於0.6之比含有水及水泥，其中維持了水與礦物質內容物之比小於0.45。據此，依據本發明之混凝土可具有小於0.6之水/水泥含量。 有利地，水泥含量可少於300 kg/m3
且較佳少於250 kg/m3
。再者，也可以規定以相同配比使用水泥及水泥替代物。 將基於下列調配物實施例進一步詳細地例示解釋本發明，其中最初於表A中顯示兩個調配物實施例1與2，彼等符合現有技術的狀態。 下表A顯示兩個按照傳統混合技術以生產1 m3
的混凝土之混凝土組成物的調配物實施例1及2。根據現有技術的狀態(表A)，使用尺寸0至X mm之砂或礫石作為骨材，其中可推測X值為2至8。 下表B顯示兩個按照依據本發明之方法以生產1 m3
的混凝土之依據本發明的混凝土組成物的調配物實施例3及4。按照調配物實施例3，為了生產1 m3
之依據本發明的低量水泥混凝土，於第一步驟，140 kg的水以及具有配比250 kg的CEM I 42.5 R水泥及配比200 kg的粉狀石灰石之比的礦物質懸浮於漿液混合器中，使用600 RPM至1600 RPM旋轉速度的攪拌元件同時添加3.6 kg的塑化劑，諸如減水劑，而提供黏合劑懸浮液。於第二步驟，提供1620 kg的砂或礫石作為骨材，其中本實施例中之骨材具有1 mm至8 mm的顆粒尺寸且尺寸小於0.125 mm之粒子的百分比係少於10%。接著於第三步驟中，於傳統混合器中，將以此方式提供之骨材與於第一步驟中提供之黏合劑懸浮液混合在一起直到達成所欲之一致性。 至於按照調配物實施例4來生產1 m3
之依據本發明的低量水泥混凝土，係應用與上述實施例相似之途徑，除了改成使用表B中指明之調配物實施例4所用水、礦物質、塑化劑及骨材的比。 對於依據本發明之方法的一個執行變形體而言，可藉由過濾之手段直接生產具有任何所預顆粒尺寸之骨材。然而，按照額外執行實施例，也可指定使用預拌骨材，其中預拌物中尺寸小於0.125 mm之粒子的百分比係少於10%且較佳少於5%。理想地，使用砂或礫石作為骨材，其不具有任何尺寸為0.125 mm之粒子。 與調配物實施例1及2相比，可使用按照依據本發明之方法生產之調配物實施例3及4之混凝土來達成相似的水/水泥比，同時減少水泥及水含量。 與傳統混凝土之製造主要是粒子尺寸或顆粒尺寸為1.0至X mm的砂或礫石作為骨材(其中X = 2、3、4、5、6、8)相反，按照依據本發明之方法，其中尺寸小於0.125 mm之粒子的百分比係少於10%且較佳少於5%。按照依據本發明之方法而使用之骨材理想地不具有尺寸小於0.125 mm之粒子。因此，骨材中不存在顯著量的細料粒子。依據本發明，這些細料粒子的部份量被增加配比的混凝土添加劑或黏合劑替換–按照本發明之實施例，被粉狀石灰石替換。此途徑允許粉狀內容物的幾乎所有部分，即粒子尺寸小於0.125 mm的部分，可獨獨於第一製程步驟之漿液混合器中加工。 基於600 RPM至1600 RPM之攪拌元件的旋轉速度，黏合劑之細料礦物質內容物的表面係透過從懸浮製程產生的機械摩擦力活化，而以此方式提供反應性且安定之水/黏合劑懸浮液作為結果。此黏合劑之細料礦物質內容物的表面活化確保以此方式生產之濃縮黏合劑懸浮液可用來作為品質最佳化之混凝土混合料，儘管主要用於砂和礫石骨材的鍵結。 按照依據本發明之方法以生產1 m3
的混凝土之額外的調配物實施例6以及按照傳統生產方法之混凝土組成物的調配物實施例5係於下表C中對比。在這方面，表C顯示調配物比較C 30 / 37 XC2, F52, GK 22。
下表D顯示額外的調配物比較SCC 40 /50 B2 GK 16 mm，其中調配物實施例7係按照傳統方法生產而調配物實施例8係按照複式混凝土混合技術(懸浮液混凝土)生產。
表E顯示C30/37 GK 8 mm之最佳化變化
優點是可透過混凝土混合料中之水泥替代物來節省成本，此係因為諸如粉狀石灰石之粉狀岩石作為替代物係可觀地較不昂貴。水泥減少的另一優點係特別由下列所組成：個別生產之混凝土與傳統生產之混凝土相比具有較佳CO2
平衡。同時，依據本發明之生產方法確保低量水泥混凝土符合技術要求並具有改善之加工性質。The method for producing low-volume cement concrete according to the present invention adopts the following method: in the first step, a proportion of minerals and a proportion of plasticizer are suspended in a ratio of water in a slurry mixer, A binder suspension is provided which comprises cement and at least one cement substitute. Also, preferably, particles having a size of less than 0.125 mm may be contained in the mineral content. In a second step of the method according to the invention, a proportion of the aggregate is provided, wherein the percentage of particles having a size of less than 0.125 mm is less than 10% and preferably less than 5%. In a third step, the proportioned aggregate is mixed with the proportioned binder suspension. For better understanding, the percentage of particles having a size of less than 0.125 mm can be indicated in the context of the present invention by the fine content or fine particle content. Surprisingly, it has been demonstrated that a low volume cement and a low volume of water concrete can be provided in accordance with the method of the invention while using an aggregate having less than 10% fines content, i.e. having a size of less than 10% less than 0.125 mm. particle. For a binder suspension separately provided under defined conditions, the binder suspension is used as a bond during mixing due to the absence of these fines contents in the aggregate and not contaminated by additional fine particles. The function of the glue of the aggregate particles is not affected. Advantageously, it is therefore possible to provide a low volume cement fresh concrete which has an improved flow capacity and therefore has an increased slump-flow measure and flow spread without having to add additional water to the mix ( Flow spread). The mineral content is formed from a proportion of cement and at least one proportion of cement substitute, preferably having only particles having a size of less than 0.125 mm. According to a particular embodiment of the method according to the invention, a sand and/or gravel fines content having particles smaller than 0.125 mm can be used as a cement substitute, wherein the sand and/or gravel used is provided in a second process step As an aggregate. A separate suspension mixing system of mineral content (which may have only particles having a size of less than 0.125 mm according to a specific embodiment of the method according to the invention) ensures that in the first process step, the particles contained in the resulting mixture are sufficiently exposed to Water, and in the process, a layer of water may form around the particles. Advantageously, the result is avoidance of agglutination and agglomeration, which provides a particularly homogeneous binder suspension. The binder particle suspension is in direct contact with the surface of the roughing element in the third step through the absence of fine particle content in the aggregate, and they are placed on each other without the influence of the additional fine content of the binder suspension. Bonding. By processing all of the fines particles in accordance with the present invention in a slurry mixer, a ratio of water/fine particle content or a ratio of water/powder content can be achieved in the resulting concrete mix. Low volume cements and low volume water concrete produced in this manner have been shown to have higher ultimate strength and their properties are more sustainable. Although the conventional concrete production method is compared with the suspension concrete method according to the present invention, the fines content ratio of the particles having a size of less than 0.125 mm contained in the resulting total mixture of the concrete formulations may be the same in quantity, by mixing in the slurry. The processing of all fine particles separately in the machine results in a significant improvement in the properties of the fresh concrete. There is essentially no limit to the use of the concrete produced in accordance with the method of the present invention. Thus, the concrete produced in accordance with the method of the present invention is suitable for use as ready-mixed concrete or as concrete for the production of precast concrete components. Conveniently, concrete produced in accordance with the method of the present invention can be used as ready-mixed concrete. In addition, concrete mixes can also be provided which are particularly suitable for the manufacture of precast concrete components. Advantageously, the method according to the invention can be carried out according to a duplex concrete mixing technique in which a binder suspension (which may also be referred to as a glue component) is in a first step in a separate slurry mixer under defined conditions. In production. At the same time, in the slurry mixer, the mineral inclusions are absorbed in the water and mixed by applying high shear. It is preferred to provide a stirring speed of the agitating element of the binder suspension greater than 600 RPM. Stirring speeds in the range of 600 RPM to 1600 RPM have proven to be particularly advantageous. The binder suspension or glue component produced in this manner is then combined with the aggregate (etc.) in a conventional mixer and mixed into a homogeneous fluid concrete mix. Due to their high availability, powdered rock, preferably powdered limestone, can be used as a cement substitute. However, it is possible to specify the use of dolomite, blast-furnace sand, fly ash, silica fume and/or fine sand having a particle size of less than 0.125 mm. In addition, it is also possible to use a plurality of different inert and/or reactive additives, such as pumice tuffs, fly ash or ash, in the mineral content. According to a preferred design variation of the method according to the invention, sand and/or gravel of a particle size of 1 mm to 8 mm can be used as the aggregate. However, it is possible to specify the use of larger particle size sand or gravel. According to the invention, sand or gravel is used as the aggregate, wherein the percentage of particles having a size of less than 0.125 mm is less than 10% and preferably less than 5%. To produce a preferred concrete mix, water and cement can be used in a ratio of less than 0.6, wherein a ratio of water to mineral content of less than 0.45 is maintained. In this respect, the water to cement ratio is the quotient of the water content and the cement content. The value of the ratio of water to mineral content relates to the quotient of water content and mineral content. Due to the replacement of the cement content in the mineral content, a cement content of less than 300 kg/m 3 and preferably less than 250 kg/m 3 can be used in the concrete mix. In an advantageous embodiment of the method according to the invention, the cement and cement substitutes can be used in equal proportions (i.e. in the same ratio). In doing so, usually half of the cement content is replaced by cement substitutes. In this case, the quotient of the ratio of cement to cement substitute is 1.0. As a result, concrete mixes can be provided that meet the statutory requirements for carbon dioxide emission limits. The aggregate, such as sand or gravel, typically contains a fines content (content with a particle size of less than 0.125 mm) ranging from 0 mm to 4 mm. During conventional manufacturing (state of the art), these fines are combined with cement or even with other additives such as blast furnace sand, powdered rock or fly ash to form a glue component in the concrete mix (which is tied to concrete) Developed as a solid matrix in the mix). For this purpose, the fines content in the aggregate, in particular those having a particle size of less than 0.125 mm, must be distributed to the adhesive glue or glue component as they are used as carrier materials or together with cement and other additives in the concrete mix. Adhesive glue of larger particle fractions greater than 1.0 mm. Thus, according to an advantageous embodiment of the method according to the invention, it can be provided that the proportion of the aggregate is provided by a filter bulk material. At the same time, the filtered fine content, the so-called sieve bottom having a particle size of less than 0.125 mm, can be used as a cement substitute for the first step. For example, a vibrating screen with a hole size of up to 1 mm can be used to filter blocks (sand or gravel). Multiple filtration steps of various pore sizes can also be specified to provide the aggregate to achieve a sieve having different particle sizes. Advantageously, providing the aggregate by filtration can be performed as a preparatory step prior to the first process step or as an intermediate step. By providing a screen bottom having a particle size of less than 0.125 mm as a cement substitute for the first process step, a particularly environmentally friendly solution is implemented, from which the cement substitute can be cut back in particular from the logical end point. The invention also encompasses a low amount of cement concrete which is produced in accordance with the method of the invention. According to the present invention, a low-volume cement concrete is a mixture of a binder suspension and a proportion of aggregates, the binder suspension consisting of water, minerals and plasticizers of various ratios, the mineral A cement and at least one cement substitute are included, wherein the percentage of particles having a size less than 0.125 mm in the aggregate is less than 10% and preferably less than 5%. The cement substitute can be selected from the group consisting of powdered limestone, dolomite, blast furnace sand, fly ash, ash and fine sand with a particle size of less than 0.125 mm. Advantageously, the fine sand is the filtered fines content from the aggregate. The use of a suitable cement substitute has the advantage that the cement content of the concrete according to the invention can be reduced, wherein at the same time the technical or processing properties of the desired concrete can be maintained. If it is ensured that the fines content in the aggregate is less than 10% and preferably less than 5%, in principle aggregates having different particle sizes can be used. According to a variant of the concrete according to the invention, the aggregate may be sand and/or gravel and have a particle size of 1 mm or more. Furthermore, different plasticizers can be used, wherein the plasticizer can have a minimum content of 2 kg/m 3 . By changing the ratio of mineral content, the technical properties of the concrete mix can be affected. Thus, in a preferred variation of the concrete according to the invention, it may be provided to contain water and cement in a ratio of less than 0.6, wherein the ratio of water to mineral content is maintained to be less than 0.45. Accordingly, the concrete according to the invention may have a water/cement content of less than 0.6. Advantageously, the cement content can be less than 300 kg/m 3 and preferably less than 250 kg/m 3 . Furthermore, it is also possible to provide for the use of cement and cement substitutes in the same ratio. The invention will be further illustrated in detail based on the following formulation examples, in which two formulation examples 1 and 2 are initially shown in Table A, which are in accordance with the state of the art. Table A below shows two formulations Examples 1 and 2 of a concrete composition according to conventional mixing techniques to produce 1 m 3 of concrete. According to the state of the art (Table A), sand or gravel having a size of 0 to X mm is used as the aggregate, and it is presumed that the X value is 2 to 8. Table B below shows two formulations Examples 3 and 4 of a concrete composition according to the invention in accordance with the process of the invention to produce 1 m 3 of concrete. According to the formulation example 3, in order to produce 1 m 3 of the low-cement concrete according to the invention, in the first step, 140 kg of water and a CEM I 42.5 R cement with a ratio of 250 kg and a powder of 200 kg The mineral of the limestone ratio is suspended in a slurry mixer and a binder suspension is provided by simultaneously adding 3.6 kg of a plasticizer, such as a water reducing agent, using a stirring element at a rotational speed of 600 RPM to 1600 RPM. In the second step, 1620 kg of sand or gravel is provided as the aggregate, wherein the aggregate of the present embodiment has a particle size of 1 mm to 8 mm and the percentage of particles having a size of less than 0.125 mm is less than 10%. Next in the third step, the aggregate provided in this manner is mixed with the binder suspension provided in the first step in a conventional mixer until the desired consistency is achieved. As for the low-volume cement concrete according to the present invention produced in accordance with Formulation Example 4, 1 m 3 was applied in a similar manner to the above-described examples, except that it was changed to use the water and minerals of Example 4 as indicated in Table B. The ratio of materials, plasticizers and aggregates. For an embodiment of the variant according to the method of the invention, the aggregate having any pre-granular size can be produced directly by means of filtration. However, according to additional embodiments, it is also possible to specify the use of ready-mixed aggregates, wherein the percentage of particles having a size of less than 0.125 mm in the premix is less than 10% and preferably less than 5%. Ideally, sand or gravel is used as the aggregate, which does not have any particles having a size of 0.125 mm. In comparison to Formulation Examples 1 and 2, the concrete of Examples 3 and 4 formulated according to the method of the present invention can be used to achieve a similar water/cement ratio while reducing cement and water content. In contrast to the method according to the invention, the manufacture of conventional concrete is mainly sand or gravel having a particle size or particle size of 1.0 to X mm as the aggregate (where X = 2, 3, 4, 5, 6, 8) The percentage of particles having a size of less than 0.125 mm is less than 10% and preferably less than 5%. The aggregate used in accordance with the method of the present invention desirably does not have particles having a size of less than 0.125 mm. Therefore, a significant amount of fine particles are not present in the aggregate. In accordance with the present invention, a portion of these fines particles are replaced by an increased proportion of concrete additive or binder - in accordance with an embodiment of the present invention, replaced by powdered limestone. This approach allows almost all portions of the powdered content, i.e., portions having a particle size of less than 0.125 mm, to be processed separately in the slurry mixer of the first process step. Based on the rotational speed of the agitating element from 600 RPM to 1600 RPM, the surface of the fine mineral content of the binder is activated by mechanical friction generated from the suspension process, thereby providing a reactive and stable water/binder in this manner. The suspension was used as a result. The surface activation of the fine mineral content of the binder ensures that the concentrated binder suspension produced in this manner can be used as a quality-optimized concrete mix, although primarily for the bonding of sand and gravel aggregates. An additional formulation according to the method of the present invention to produce 1 m 3 of concrete Example 6 and a formulation of the concrete composition according to the conventional production method Example 5 are compared in Table C below. In this regard, Table C shows the formulations comparing C 30 / 37 XC2, F52, GK 22. Table D below shows additional formulations comparing SCC 40 /50 B2 GK 16 mm, where formulation Example 7 was produced according to conventional methods and formulation Example 8 was produced according to duplex concrete mixing technology (suspension concrete). Table E shows the optimization of C30/37 GK 8 mm The advantage is that it can be cost effective through the cement substitute in the concrete mix, which is considerably less expensive as a powdery rock such as powdered limestone. Another advantage of cement reduction is in particular the following: Individually produced concrete has a better CO 2 balance than conventionally produced concrete. At the same time, the production method according to the invention ensures that low-volume cement concrete meets technical requirements and has improved processing properties.