JP7372044B2 - Method for adjusting the usage ratio of early strength cement and blast furnace cement B type, method for manufacturing mixed cement, method for manufacturing ready-mixed concrete - Google Patents
Method for adjusting the usage ratio of early strength cement and blast furnace cement B type, method for manufacturing mixed cement, method for manufacturing ready-mixed concrete Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims description 126
- 239000011400 blast furnace cement Substances 0.000 title claims description 54
- 238000000034 method Methods 0.000 title claims description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 239000000463 material Substances 0.000 claims description 13
- 238000005728 strengthening Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 9
- 238000009415 formwork Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Description
本発明は、顧客からの要求に従う性能を有するコンクリートを製造するために必要な、早強セメントと高炉セメントＢ種との使用比を求める方法、及び該方法で求めた使用比で混合セメント、生コンクリートを効率よく製造し出荷する方法に係わる。 The present invention provides a method for determining the usage ratio of early-strengthening cement and blast furnace cement type B necessary for producing concrete with performance in accordance with customer requirements, and a method for determining the usage ratio of early-strengthening cement and blast furnace cement, It is concerned with how to efficiently manufacture and ship concrete.
一般的にコンクリートの圧縮強度は材齢２８日で管理されている。そのため、発注者（顧客）からは材齢２８日での圧縮強度についての性能を満足する生コンクリートを供給することが要求される。コンクリートの材齢２８日圧縮強度は、該コンクリートを製造するために使用したセメントの種類と、水／セメント比によって決定され、他の因子が寄与することは事実上無い。 Generally, the compressive strength of concrete is controlled at an age of 28 days. Therefore, the orderer (customer) requires the supply of ready-mixed concrete that satisfies performance regarding compressive strength at 28 days of age. The 28-day compressive strength of concrete is determined by the type of cement used to produce the concrete and the water/cement ratio, with virtually no other factors contributing.
そのため、顧客からの注文を受けた生コンクリート工場（以下、生コン工場と略す）では、生コンクリートを製造出荷する際には、該生コン工場で扱っているセメントにおける水／セメント比と材齢２８日圧縮強度との関係から、該顧客の要求する材齢２８日圧縮強度を示す水／セメント比を割り出し、当該水／セメント比で生コンクリートを調製して出荷するのが通常である。 Therefore, at a ready-mixed concrete factory (hereinafter referred to as a ready-mixed concrete factory) that receives an order from a customer, when manufacturing and shipping ready-mixed concrete, the water/cement ratio of the cement handled at the ready-mixed concrete factory and the age of 28 days are determined. From the relationship with the compressive strength, the water/cement ratio that indicates the 28-day age compressive strength required by the customer is determined, and ready-mixed concrete is prepared and shipped using the determined water/cement ratio.
しかしながら、コンクリートの型枠の脱型に関しては初期強度が重要となる。型枠を脱型する際に所定の強度に達していない場合、コンクリートに歪やひび割れが生じ要求された性能を満足できない。そのため、初期強度がある程度確保できていなければ型枠の脱型が実施できず、初期強度を管理していなければ工期の遅延が発生する。従って、材齢２８日圧縮強度のみならず、材齢１日の圧縮強度も顧客から要求値として出される場合がある。 However, initial strength is important when demolding concrete formwork. If the predetermined strength is not reached when the formwork is removed, the concrete will become distorted and cracked, making it impossible to satisfy the required performance. Therefore, the formwork cannot be demolded unless a certain level of initial strength is secured, and if the initial strength is not controlled, the construction period will be delayed. Therefore, not only the 28-day compressive strength but also the 1-day compressive strength may be requested by the customer.
しかしながら、前記した顧客からの要望に従う材齢２８日圧縮強度を示す水／セメント比で調製を行っても、当該水／セメント比で材齢１日の圧縮強度も顧客の要求値に達するとは限らない。単一のセメントで材齢１日圧縮強度のみを高めることは難しく、よって材齢１日圧縮強度を高めるためには、材齢２８日圧縮強度を満足するために要求される値よりもセメントの割合を上げる（水／セメント比を小さくする）こととなる。 However, even if preparation is made with a water/cement ratio that shows the compressive strength at 28 days of age according to the customer's request, it is difficult to imagine that the compressive strength at 1 day of age will reach the value requested by the customer at that water/cement ratio. Not exclusively. It is difficult to increase only the 1-day compressive strength of a single cement. Therefore, in order to increase the 1-day compressive strength of the material, the value of the cement must be higher than the value required to satisfy the 28-day compressive strength of the material. This means increasing the ratio (reducing the water/cement ratio).
そのため、使用するセメント量が増大することになるし、またセメント量の増加により、所望のワーカビリティー等を得るために必要な混和剤量も増加することになるなど、コンクリート全体のコストが増加し経済的でない。 As a result, the amount of cement used increases, and with the increase in cement amount, the amount of admixture required to obtain the desired workability, etc. increases, which increases the overall cost of concrete and makes it less economical. Not on point.
材齢１日圧縮強度を高くする方法としては、早期に強度を発現する早強セメントを混合する方法が考えられる。しかしながら早強セメントは比較的高価である。また早強セメントは粉末度が高いために粘性の高いコンクリートになりやすく施工性も低下する。そのためにコストを下げるためには、必要な材齢２８日圧縮強度を得つつ、水／セメント比を小さくし、かつ、必要な材齢１日圧縮強度を得つつも早強セメントの使用量は少なくする必要があり、極めて煩雑な管理が必要と考えられていた。 One possible method for increasing the compressive strength after one day of material age is to mix early strength cement that develops strength early. However, early strength cement is relatively expensive. In addition, early strength cement has a high powder content, which tends to result in highly viscous concrete and reduces workability. Therefore, in order to reduce costs, it is necessary to reduce the water/cement ratio while obtaining the required 28-day compressive strength, and to reduce the amount of early-strength cement used while obtaining the required 1-day compressive strength. It was thought that it was necessary to reduce the amount of water used, and that extremely complicated management was necessary.
従って、本発明では顧客からの要求に従う材齢１日圧縮強度および材齢２８日圧縮強度を有するコンクリート硬化体を、できるだけ低コストで製造できる方法を提供しようとするものである。 Therefore, the present invention aims to provide a method for producing a hardened concrete body having a 1-day compressive strength and a 28-day compressive strength in accordance with customer requirements at the lowest possible cost.
本発明は、上記課題を解決するために鋭意研究を進めた。そして、早強セメントと高炉セメントＢ種との混合セメントを使用して製造したコンクリートにおける材齢２８日圧縮強度は、早強セメントの割合が２５～７５質量％の範囲では、早強セメントと高炉セメントＢ種の混合比によらず、水／セメント比のみによって決定されることを見いだし、さらに検討を進めた結果、本発明を完成させるに至った。 The present invention has been developed through intensive research to solve the above problems. The 28-day compressive strength of concrete manufactured using a mixed cement of early-strengthening cement and blast furnace cement type B is as follows: It was discovered that it was determined only by the water/cement ratio, regardless of the mixing ratio of cement B type, and as a result of further investigation, the present invention was completed.
すなわち、本発明は、所定の材齢１日圧縮強度および材齢２８日圧縮強度を得るための早強セメントと高炉セメントＢ種の使用比を調整する方法であって、下記の（１）～（３）の手順に従い早強セメントと高炉セメントＢ種の使用比を調整することを特徴とする早強セメントと高炉セメントＢ種の使用比の調整方法である。
（１）予め求めておいた、早強セメント２５～７５質量部と高炉セメントＢ種７５～２５質量部とを混合して調製したコンクリート硬化体における、材齢２８日圧縮強度と水／セメント比との関係から、前記所定の材齢２８日圧縮強度を呈する水／セメント比を求める。
（２）該水／セメント比において、前記所定の材齢１日圧縮強度を呈する早強セメントと高炉セメントＢ種との使用比を、予め求めておいた、早強セメントと高炉セメントＢ種との使用比と材齢１日圧縮強度と水／セメント比との関係から求める。
（３）所定の材齢１日圧縮強度および材齢２８日圧縮強度を得るための早強セメントと高炉セメントＢ種の使用比を、（２）で求めた早強セメントと高炉セメントＢ種の使用比となるように調整する。
That is, the present invention is a method for adjusting the ratio of use of early strength cement and blast furnace cement type B in order to obtain predetermined age 1 day compressive strength and age 28 day compressive strength , the method includes the following (1). This is a method for adjusting the usage ratio of early strength cement and blast furnace cement type B, which is characterized by adjusting the usage ratio of early strength cement and blast furnace cement type B according to the steps of (3).
(1) Compressive strength and water/cement ratio at 28 days of age in a hardened concrete prepared by mixing 25 to 75 parts by mass of early strength cement and 75 to 25 parts by mass of blast furnace cement type B, which were determined in advance. From the relationship, the water/cement ratio that exhibits the predetermined 28-day compressive strength is determined.
(2) At the water/cement ratio, the use ratio of early-strengthening cement and blast furnace cement type B, which exhibits the predetermined age 1-day compressive strength, is determined in advance between the early-strengthening cement and blast furnace cement type B. It is calculated from the relationship between the usage ratio of , the compressive strength in 1 day of material age, and the water/cement ratio.
(3) The ratio of use of early-strengthening cement and blast furnace cement type B to obtain the specified age 1-day compressive strength and age-28 day compressive strength is determined in (2). Adjust to match the usage ratio.
また本発明は、上記方法で求めた使用比で調製された混合セメントあるいは生コンクリートを製造出荷する方法も提供する。 The present invention also provides a method for manufacturing and shipping mixed cement or ready-mixed concrete prepared at the usage ratio determined by the above method.
本発明によれば、顧客が要求する材齢２８圧縮強度、材齢１日圧縮強度の両方を満足するコンクリート硬化体を製造することができ、かつ当該要求を満たすなかで、水／セメント比は大きく、早強セメントの使用割合は少ない組成を容易に把握できるため、コストの低減化を最大限図ることが可能になる。 According to the present invention, it is possible to produce a hardened concrete body that satisfies both age 28 compressive strength and age 1 day compressive strength required by customers, and while satisfying the requirements, the water/cement ratio is Since the composition is large and the proportion of early-strength cement used is small, it is easy to understand the composition, making it possible to reduce costs to the maximum.
また、早強セメントと高炉セメントＢ種は共に生コン工場で汎用的に使用されている材料であるため、多くの場合は新たな設備投資を必要としない。 Furthermore, since both early-strength cement and blast furnace cement type B are materials commonly used in ready-mixed concrete factories, new equipment investment is not required in many cases.
本発明においては、顧客が要求する材齢２８日圧縮強度及び材齢１日圧縮強度を発現するコンクリート硬化体を製造できるように、早強セメントと高炉セメントＢ種とを混合して使用する。なお、本発明における早強セメントと高炉セメントＢ種は、各々ＪＩＳ規格で定義される早強ポルトランドセメントと高炉セメントＢ種であり、生コン工場で汎用的に使用されているセメントである。高炉セメントＢ種は高炉スラグの分量が３０質量％を超え、６０質量％以下と定義されるが、本発明の実施にあたっては高炉スラグが４０～５０質量％のものを使用することが好ましい。 In the present invention, early strength cement and blast furnace cement type B are mixed and used in order to produce a hardened concrete that exhibits the 28-day compressive strength and the 1-day compressive strength required by the customer. Note that the early-strength cement and blast furnace cement type B in the present invention are early-strength Portland cement and blast furnace cement type B, respectively, defined by JIS standards, and are cements commonly used in ready-mixed concrete factories. Blast furnace cement type B is defined as having a blast furnace slag content of more than 30% by mass and 60% by mass or less, but in carrying out the present invention, it is preferable to use one containing 40 to 50% by mass of blast furnace slag.
また、材齢２８日圧縮強度、材齢１日圧縮強度は、ＪＩＳ Ａ １１０８（コンクリートの圧縮強度試験方法）に従って測定される値を用いることが好ましいが、必要に応じて、顧客と測定方法・条件を取り決めて合意していればよく、これに限定されるものではない。 In addition, it is preferable to use values measured in accordance with JIS A 1108 (concrete compressive strength test method) for the 28-day compressive strength and the 1-day compressive strength, but if necessary, please discuss the measurement method and method with the customer. It is sufficient that the terms and conditions are negotiated and agreed upon, but the terms are not limited to this.
本発明においてコンクリートとは以下のように定義される。即ち、セメント、骨材（細骨材、粗骨材）、水の混練物であり、フレッシュ性状（スランプや空気量）、施工性（材料分離抵抗性、ポンプ圧送性）、耐久性（収縮、劣化因子の浸透性）などを考慮し、それぞれの材料を最適な配合条件（割合や使用量）の範囲で混練したものおよび硬化したもの。この定義のコンクリートの範囲で以下に詳述する関係は成り立ち、単位推量、骨材配合等はいちいち考慮する必要はない。 In the present invention, concrete is defined as follows. In other words, it is a mixture of cement, aggregate (fine aggregate, coarse aggregate), and water. Materials are kneaded and cured under the optimal blending conditions (ratios and amounts used), taking into account factors such as permeability of deterioration factors. The relationships detailed below hold within the range of concrete defined in this definition, and there is no need to consider unit estimation, aggregate mix, etc.
本発明においては、顧客の要求する材齢２８日圧縮強度及び材齢１日圧縮強度を満足する早強セメントと高炉セメントＢ種との使用比を迅速に求めるために、以下の関係を予め求めておく必要がある。 In the present invention, in order to quickly determine the usage ratio of early strength cement and blast furnace cement type B that satisfies the 28-day compressive strength and 1-day compressive strength required by the customer, the following relationship is determined in advance. It is necessary to keep it.
即ち一つめは、早強セメントと高炉セメントＢ種とを混合して調製したコンクリート硬化体における、材齢２８日圧縮強度と水／セメント比との関係であり、
二つめは、早強セメントと高炉セメントＢ種との使用比と、材齢１日圧縮強度と、水／セメント比との関係である。
That is, the first is the relationship between the 28-day age compressive strength and the water/cement ratio in a concrete hardened body prepared by mixing early strength cement and blast furnace cement type B.
The second is the relationship between the usage ratio of early strength cement and blast furnace cement type B, the age 1 day compressive strength, and the water/cement ratio.
図１に早強セメントと高炉セメントＢ種を異なる割合で混合して製造したコンクリート硬化体の材齢２８日圧縮強度と水／セメント比の関係を示す。この図に示されているように、いずれの水／セメント比においても、早強セメントと高炉セメントＢ種との割合にかかわらず材齢２８日圧縮強度は等しい。また、早強セメントと高炉セメントＢ種を混合した混合セメントの材齢２８日圧縮強度は水／セメント比と直線関係にあることがわかる。 Figure 1 shows the relationship between the 28-day compressive strength and the water/cement ratio of hardened concrete produced by mixing early-strength cement and blast furnace cement B in different ratios. As shown in this figure, at any water/cement ratio, the 28-day age compressive strength is the same regardless of the ratio of early strength cement to blast furnace cement type B. Furthermore, it can be seen that the 28-day age compressive strength of the mixed cement, which is a mixture of early strength cement and blast furnace cement B type, has a linear relationship with the water/cement ratio.
そのため、使用している早強セメントと高炉セメントＢ種において上記関係を求めておけば、顧客の要求する材齢２８日圧縮強度から、当該材齢２８日圧縮強度を呈する水／セメント比が、早強セメントと高炉セメントＢ種の割合を考慮することなく、求められる。 Therefore, if the above relationship is determined for the early strength cement and B type blast furnace cement used, the water/cement ratio that exhibits the 28-day compressive strength required by the customer can be calculated as follows: It can be determined without considering the ratio of early strength cement and blast furnace cement type B.
ただし、本発明者等の検討によれば、上記関係が成り立つのは早強セメントの割合が２５～７５質量％の範囲にある場合に限られる。従って、早強セメントの使用割合が２５～７５質量％の範囲内において所望の材齢１日圧縮強度が得られない場合には、本発明の適用はできない。 However, according to studies by the present inventors, the above relationship holds only when the proportion of early strength cement is in the range of 25 to 75% by mass. Therefore, the present invention cannot be applied if the desired 1-day compressive strength cannot be obtained within the range of 25 to 75% by mass of early strength cement.
なお早強セメント、高炉セメントＢ種のいずれにおいても、製造日時、製造メーカー等により、発現する強度が異なる場合が少なくない。そして、生コン工場においては、各セメントはローリー等により運ばれてきたものが納入され、各々サイロへ貯蔵されるのが一般的である。従って、上記関係はセメントの納入バッチ毎に求めておく。 In both early strength cement and B type blast furnace cement, the developed strength often differs depending on the date and time of manufacture, manufacturer, etc. In a ready-mixed concrete factory, each type of cement is generally delivered by lorry or the like and stored in respective silos. Therefore, the above relationship is determined for each batch of cement delivered.
一方で、早強セメントと高炉セメントＢ種の使用比によらず材齢２８日圧縮強度は一定となるため、図１に示したように広い範囲で早強セメントと高炉セメントＢ種の使用比を求めておく必要はなく、使用比は１点、例えば、早強セメントと高炉セメントＢ種の割合が５０％ずつでの値を求めておけばよい。 On the other hand, the 28-day compressive strength remains constant regardless of the usage ratio of early strength cement and blast furnace cement B, so as shown in Figure 1, the usage ratio of early strength cement and blast furnace cement B can vary over a wide range. There is no need to calculate the value, and it is sufficient to calculate the value when the usage ratio is one point, for example, the ratio of early strength cement and blast furnace cement type B is 50% each.
また、一般的に使用されるコンクリートの水／セメント比は４０～６５％の範囲が多いことから、水／セメント比は４０～６５％の範囲で上記関係を求めておけば十分である。 Furthermore, since the water/cement ratio of commonly used concrete is often in the range of 40 to 65%, it is sufficient to obtain the above relationship with the water/cement ratio in the range of 40 to 65%.
因みに図１（及び後述する図２）に示したデータは、以下の表に記載の組成での値である。 Incidentally, the data shown in FIG. 1 (and FIG. 2 described later) are values for the compositions listed in the table below.
また細骨材は海砂（密度２．５６ｇ／ｃｍ３）を、粗骨材は砕石（密度２．７３ｇ／ｃｍ３）を使用した。 Sea sand (density 2.56 g/cm 3 ) was used as the fine aggregate, and crushed stone (density 2.73 g/cm 3 ) was used as the coarse aggregate.
図２は、各水／セメント比における早強セメントと高炉セメントＢ種の使用比と、材齢１日圧縮強度との関係を示したものである（縦軸の「ＨＣ割合」は早強セメントと高炉セメントＢ種の合計１００質量％に対する早強セメントの使用割合を示す）。 Figure 2 shows the relationship between the ratio of use of early-strengthening cement and blast furnace cement type B at each water/cement ratio and the 1-day compressive strength of the material. and the proportion of early-strength cement used relative to the total 100% by mass of blast furnace cement type B).
いずれの水／セメント比においても、材齢１日圧縮強度と早強セメントと高炉セメントＢ種の使用比とは直線関係にあることがわかる。従って、いずれの水／セメント比においても、早強セメントと高炉セメントＢ種との使用比を調整することで材齢１日圧縮強度を制御することができる。 It can be seen that for any water/cement ratio, there is a linear relationship between the 1-day compressive strength of the material and the usage ratio of early strength cement and blast furnace cement type B. Therefore, at any water/cement ratio, the 1-day age compressive strength can be controlled by adjusting the ratio of early strength cement to blast furnace cement type B.
なお図２に示されているように、材齢１日圧縮強度は、早強セメント１００％の値から、高炉セメントＢ種１００％の値まで直線関係にある。従って、その中間の値をわざわざ測定せずとも、各水／セメント比において早強セメント１００％の値と高炉セメントＢ種１００％の値を求めれば、中間にある値も算出でき、これから早強セメントと高炉セメントＢ種との使用比と、材齢１日圧縮強度と、水／セメント比との関係を把握することができる。むろん、早強セメントと高炉セメントＢ種とを様々な割合で使用した際の値を求めても構わない。 As shown in FIG. 2, the 1-day compressive strength of the material has a linear relationship from the value of 100% early strength cement to the value of 100% B type blast furnace cement. Therefore, without going to the trouble of measuring the values in between, if you find the values for 100% early strength cement and 100% blast furnace cement type B at each water/cement ratio, you can calculate the intermediate values. It is possible to understand the relationship between the usage ratio of cement and blast furnace cement B type, the age 1 day compressive strength, and the water/cement ratio. Of course, values may be obtained using various ratios of early strength cement and B blast furnace cement.
また、この関係も上記と同様に、セメントの納入バッチ毎に求めておく。 Further, this relationship is also determined for each batch of cement delivered in the same way as above.
本発明においては、上記２つの関係から、以下のようにして顧客からの要求に従う材齢２８日圧縮強度及び材齢１日圧縮強度を発現するコンクリート硬化体とできる、早強セメントと高炉セメントＢ種との使用比、及び水／セメント比を求めることができる。 In the present invention, from the above two relationships, early strength cement and blast furnace cement B can be made into a concrete hardened body that exhibits 28-day compressive strength and 1-day compressive strength in accordance with customer requests as follows. The usage ratio with seeds and water/cement ratio can be determined.
即ち、図１に示す関係を利用して、顧客の要求する材齢２８日圧縮強度を発現する水／セメント比を求める。ついで、図２に示す関係を利用して、当該水／セメント比において顧客の要求する材齢１日圧縮強度を発現する早強セメントと高炉セメントＢ種の使用割合を求めることができる。 That is, using the relationship shown in FIG. 1, the water/cement ratio that achieves the 28-day compressive strength required by the customer is determined. Next, by using the relationship shown in FIG. 2, it is possible to determine the usage ratio of early strength cement and blast furnace cement type B that exhibits the 1-day age compressive strength required by the customer at the water/cement ratio.
より具体的には、例えば、顧客の要求する材齢２８日圧縮強度が４５Ｎ／ｍｍ２、材齢１日圧縮強度が１０Ｎ／ｍｍ２であった場合、図１から水／セメント比は５４％程度とすればよいことが判る。そして図２から、この水／セメント比５４％において材齢１日圧縮強度が１０Ｎ／ｍｍ２となるのは、早強セメントの割合が５８％のところであることがわかる。 More specifically, for example, if the customer requests a 28-day compressive strength of 45 N/mm 2 and a 1-day compressive strength of 10 N/mm 2 , the water/cement ratio is 54% from Figure 1. It turns out that it is sufficient to set the value to a certain degree. From FIG. 2, it can be seen that at this water/cement ratio of 54%, the 1-day compressive strength of the material becomes 10 N/mm 2 when the proportion of early strength cement is 58%.
従って、顧客からの要求に従う材齢２８日圧縮強度及び材齢１日圧縮強度を発現可能な生コンクリートとして、早強セメントを５８％、高炉セメントＢ種を４２％の割合で使用し、水／セメント比５４％のものを調製し出荷すればよい。 Therefore, as ready-mixed concrete capable of achieving 28-day compressive strength and 1-day compressive strength in accordance with customer requirements, we used 58% early strength cement and 42% blast furnace cement type B, and used water/ It is sufficient to prepare and ship a product with a cement ratio of 54%.
なお必要に応じ、安全をみて顧客の要求する圧縮強度よりも数％程度高い圧縮強度となるように水／セメント比や、セメントの使用比を決定してもよい。 If necessary, the water/cement ratio and the cement usage ratio may be determined in consideration of safety so that the compressive strength is several percent higher than the compressive strength required by the customer.
本発明においては、上記のようにして顧客からの要求に従う性能を有するコンクリートを製造するために必要な、早強セメントと高炉セメントＢ種との使用比及び水／セメント比を求めることができるので、その比に従い、生コンクリートを調製し、出荷すればよい。この際、早強セメントと高炉セメントＢ種とは予め所定の割合で混合してから使用しても良いし、生コンクリート調製時に別々に他の材料と混練してもよい。 In the present invention, the use ratio of early strength cement and blast furnace cement type B and the water/cement ratio necessary for manufacturing concrete with performance according to customer requests can be determined as described above. According to the ratio, ready-mixed concrete can be prepared and shipped. At this time, early strength cement and blast furnace cement type B may be mixed in advance at a predetermined ratio before use, or may be separately kneaded with other materials during the preparation of ready-mixed concrete.
なお、通常、顧客からは圧縮強度以外の物性、例えば、スランプなども要求されるが、このような物性は定法に従い、単位水量（又は単位セメント量：上記のように水／セメントは決定されているため、どちらか一方を決めれば、必然的に他方も決まる）や骨材配合、ＡＥ減水剤等の各種混合剤の配合の調整により制御すればよい。 Note that customers usually request physical properties other than compressive strength, such as slump, but such physical properties are determined in accordance with the standard method by unit water volume (or unit cement volume: water/cement is determined as above). Therefore, if one is determined, the other is also necessarily determined), the mix of aggregates, and the mix of various mixtures such as AE water reducer can be controlled.
生コンクリートの製造にあたっては、上記のような材料を定法に従い混練すれば良く、当該混練方法は生コンクリート工場で実施されている方法が特に制限なく使用できる。また、製造した生コンクリートの出荷方法も、通常の生コンクリートの出荷方法と同一でよい。 In producing ready-mixed concrete, the above-mentioned materials may be kneaded according to a standard method, and any method used in a ready-mixed concrete factory can be used without any particular restriction. Further, the method for shipping the manufactured ready-mixed concrete may be the same as the method for shipping normal ready-mixed concrete.
また本発明では生コンクリートとして出荷せずに、前記方法で求めた比で早強セメントと高炉セメントＢ種を混合し、この混合セメントを顧客に出荷することもできる。この出荷に際して、前記方法で求めた水／セメント比を併せて顧客に連絡しておけば、顧客等が当該混合セメントを使って必要な圧縮強度を呈するコンクリートを製造することが可能である。 Furthermore, in the present invention, instead of shipping as ready-mixed concrete, early strength cement and blast furnace cement type B can be mixed in the ratio determined by the above method, and this mixed cement can be shipped to customers. At the time of shipment, if the water/cement ratio determined by the above method is also communicated to the customer, the customer etc. can use the mixed cement to manufacture concrete exhibiting the necessary compressive strength.
Claims (3)
（１）予め求めておいた、早強セメント２５～７５質量部と高炉セメントＢ種７５～２５質量部とを混合して調製したコンクリート硬化体における、材齢２８日圧縮強度と水／セメント比との関係から、前記所定の材齢２８日圧縮強度を呈する水／セメント比を求める。
（２）該水／セメント比において、前記所定の材齢１日圧縮強度を呈する早強セメントと高炉セメントＢ種との使用比を、予め求めておいた、早強セメントと高炉セメントＢ種との使用比と材齢１日圧縮強度と水／セメント比との関係から求める。
（３）所定の材齢１日圧縮強度および材齢２８日圧縮強度を得るための早強セメントと高炉セメントＢ種の使用比を、（２）で求めた早強セメントと高炉セメントＢ種の使用比となるように調整する。 A method for adjusting the ratio of use of early-strengthening cement and blast furnace cement type B to obtain predetermined 1-day compressive strength and 28-day compressive strength , the method comprising the following steps (1) to (3): A method for adjusting the usage ratio of early strength cement and blast furnace cement type B, characterized in that the usage ratio of early strength cement and blast furnace cement type B is adjusted according to the following.
(1) Compressive strength and water/cement ratio at 28 days of age in a hardened concrete prepared by mixing 25 to 75 parts by mass of early strength cement and 75 to 25 parts by mass of blast furnace cement type B, which were determined in advance. From the relationship, the water/cement ratio that exhibits the predetermined 28-day compressive strength is determined.
(2) At the water/cement ratio, the use ratio of early-strengthening cement and blast furnace cement type B, which exhibits the predetermined age 1-day compressive strength, is determined in advance between the early-strengthening cement and blast furnace cement type B. It is calculated from the relationship between the usage ratio of , the compressive strength in 1 day of material age, and the water/cement ratio.
(3) The ratio of use of early-strengthening cement and blast furnace cement type B to obtain the specified age 1-day compressive strength and age-28 day compressive strength is determined in (2). Adjust to match the usage ratio.
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| JP2014148059A (en) | 2013-01-31 | 2014-08-21 | Sumitomo Osaka Cement Co Ltd | Method for producing concrete having desired characteristics |
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| JP2006168997A (en) | 2003-11-20 | 2006-06-29 | Mitani Sekisan Co Ltd | High-strength concrete-molded body and material to be charged in mold |
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