JP4349990B2 - A method for measuring and calculating unit water volume of ready-mixed concrete and a unit water volume measuring system for ready-mixed concrete. - Google Patents
A method for measuring and calculating unit water volume of ready-mixed concrete and a unit water volume measuring system for ready-mixed concrete. Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 68
- 238000000034 method Methods 0.000 title claims description 36
- 239000004568 cement Substances 0.000 claims description 35
- 238000005259 measurement Methods 0.000 claims description 12
- 238000012856 packing Methods 0.000 claims 2
- 239000000463 material Substances 0.000 description 19
- 239000000203 mixture Substances 0.000 description 9
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000012937 correction Methods 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002352 surface water Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 240000007643 Phytolacca americana Species 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241000219307 Atriplex rosea Species 0.000 description 1
- 241000316887 Saissetia oleae Species 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
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Description
本発明は生コンクリートに含有している単位容積当りの水分量、及び実水セメント比を正確にしかも迅速に測定する方法に関するものである。 The present invention relates to a method for accurately and rapidly measuring the moisture content per unit volume contained in ready-mixed concrete and the actual water cement ratio.
生コンクリートは、骨材、セメント、水、混和剤などが配合され、これらをコンクリートミキサーに入れて混練することで作られる。生コンクリートの製造においては上記材料の配合割合が重要であり、特に水の含有量はコンクリートの強度に大きな影響を与えている。そこで、骨材の表面に含まれる水分も正確に測定して水の投入量を決めることが必要となる。 Ready-mixed concrete is made by blending aggregate, cement, water, admixture, etc., and putting them in a concrete mixer and kneading them. In the production of ready-mixed concrete, the mixing ratio of the above materials is important. In particular, the water content has a great influence on the strength of the concrete. Therefore, it is necessary to accurately measure water contained in the surface of the aggregate to determine the amount of water to be charged.
その為に、生コンクリートでは骨材の貯蔵槽内部に水分センサーを設置し、貯蔵槽内における骨材の表面水率を測定している。また、測定精度を上げる為の水分センサーを設け、その平均値を算出して補正水量を決定する方法もある。しかし、水分センサーが貯蔵槽の内部に設けられていることから、貯蔵槽内部という閉鎖的空間である測定面上に骨材が滞留してしまい、真の連続的な測定は困難である。 For this purpose, ready-mixed concrete has a moisture sensor installed inside the aggregate storage tank to measure the surface water content of the aggregate in the storage tank. There is also a method in which a moisture sensor for increasing the measurement accuracy is provided and the average value is calculated to determine the correction water amount. However, since the moisture sensor is provided inside the storage tank, the aggregate stays on the measurement surface, which is a closed space inside the storage tank, and true continuous measurement is difficult.
特開２００３−２３６８２４号に係る「生コンプラントにおける骨材の水分測定方法」は、水分センサーを計量ゲートの真下の開放された自由空間に設けて、水分センサーの測定面上の骨材の流れを妨げることなく測定面上の骨材を常に入れ替えるようになして連続して骨材の水分を測定する方法である。しかし、この方法は骨材の水分量を測定するものであり、生コンクリートの水分含有量を直接測定するものでは無い為に誤差が発生する。 According to Japanese Patent Laid-Open No. 2003-236824, “Aggregate Moisture Measurement Method in a Raw Plant” provides a moisture sensor in an open free space just below a measuring gate, and the flow of aggregate on the measurement surface of the moisture sensor This is a method of continuously measuring the moisture content of the aggregate by constantly replacing the aggregate on the measurement surface without obstruction. However, since this method measures the moisture content of the aggregate and does not directly measure the moisture content of the ready-mixed concrete, an error occurs.
特開２００４−１６３３１７号に係る「生コンクリートの単位水量測定方法及び装置」は、生コンクリートを打設現場で受け入れる際に、空気量試験により空気量を測定した後、中性子水分計をその試料容器の中心にセットして、熱中性子数を検知し、事前に把握した熱中性子数と試料容器中の水量との関係から試料容器中の水量を算定し、細骨材及び粗骨材の吸水量と実測した空気量を用いて単位水量を算定する方法である。しかし、上記特開２００４−１６３３１７号に係る測定装置は複雑であり、コストも高く汎用性に欠ける。
このように、従来の生コンクリートに含まれている水分量を測定する方法には上記のごとき問題がある。本発明が解決しようとする課題はこの問題点であり、簡単な方法で、手軽にしかも正確に測定可能な水分量の測定方法を提供する。 Thus, the conventional method for measuring the amount of water contained in ready-mixed concrete has the above-mentioned problems. The problem to be solved by the present invention is this problem, and provides a method for measuring the amount of water that can be measured easily and accurately by a simple method.
生コンクリートの単位水量の変動に及ぼす要因は数多くあり、工程中の材料計量値の誤差、骨材表面水の変動、材料密度の変動、骨材の実績率、粗粒率の変動、空気量の変動、残水の有無、運転時間、天候(気温、降水)などがあり、変動の要因を特定することは困難である。従来から提案されている方法は、骨材の表面水の見込み違いにのみ注目している場合が多いが、それだけでは誤差が大きくなる。そこで、全ての要因が変動するものとして、仮定値を極力排除し、現実の生コンクリートの実測値の重量と容積にのみ注目し、単位水量を精密に求める方法である。 There are many factors affecting fluctuations in the unit water volume of ready-mixed concrete, such as errors in material measurement values during the process, fluctuations in aggregate surface water, fluctuations in material density, aggregate performance ratio, fluctuation in coarse grain ratio, air volume There are fluctuations, presence / absence of residual water, operation time, weather (temperature, precipitation), etc., and it is difficult to identify the factors of fluctuation. Conventionally proposed methods often pay attention only to the difference in prospect of the surface water of the aggregate, but this alone increases the error. Therefore, assuming that all the factors fluctuate, it is a method of eliminating the assumed value as much as possible and paying attention only to the actual measured weight and volume of the ready-mixed concrete and obtaining the unit water amount precisely.
計画配合上の単位量を下記表のように表す。
以上の式からも分かるとおり、式上の誤差要因は、計画配合上の水を除いた材料密度と実際の生コンクリートの水を除いた材料密度が異なる場合のみである。計画配合上の水を除いた材料密度と実際の生コンクリートの水を除いた材料密度が異なる場合とは、材料密度が大きく変動した場合（セメントの密度は殆ど変動しないので、現実的には骨材の密度が変動した場合）であり、それ以外の要因は殆ど影響を受けない。したがって、得られた単位水量が計画配合の単位水量と著しく異なる場合は、実際に単位水量が変動しているか、骨材の密度が設計値に対して変動しているか、のどちらかである。このことは、著しく単位水量が変動する要因がなければ骨材の密度が変動していると判断できることを示し、その場合、毎月実施している直近の試験値を用いて計算することにより精度よく単位水量を求めることができる。 As can be seen from the above formula, the error factor in the formula is only when the material density excluding the water in the planned mix differs from the material density excluding the water of the actual ready-mixed concrete. The material density excluding water on the planned mix and the material density excluding actual ready-mixed concrete differ from the material density when the material density fluctuates greatly (the cement density hardly fluctuates. This is the case when the density of the material fluctuates), and other factors are hardly affected. Therefore, when the obtained unit water amount is significantly different from the unit water amount of the planned composition, either the unit water amount actually fluctuates or the aggregate density fluctuates with respect to the design value. This means that it can be judged that the density of the aggregate is fluctuating if there is no factor that causes the unit water volume to fluctuate significantly. Unit water volume can be determined.
又、現在提案されている推定方法の多くは、水セメント比を推定する場合、計画配合上の単位セメント量か、又はセメント計量値を用いる。しかし、そもそも試験した生コンクリートの単位水量が計画配合通りか否かを推定しているのであるから、水セメント比を計画配合上の単位セメント量を用いて推定するのは余り意味のあることではない。又、セメント計量値を用いるにしても、そのバッチのコンクリート容積(出来上がり量)は判らないから、正確な単位セメント量は算出できないことになる。 In many of the currently proposed estimation methods, when estimating the water-cement ratio, a unit cement amount or a cement measurement value in a planned composition is used. However, since the unit water volume of the ready-mixed concrete that was tested is estimated as planned, it is not very meaningful to estimate the water-cement ratio using the unit cement amount in the planned blend. Absent. Moreover, even if the cement measurement value is used, the concrete volume (finished amount) of the batch is not known, so that the accurate unit cement amount cannot be calculated.
本発明では、実際の生コンクリートの水セメント比を高精度で推定できる。
試料の測定空気量Ａ％、そして単位水量Ｗ(ｋｇ／ｍ3)が得られるので、試料の水
ＣV＝Ｗ＋ＶC＋ＶS＋ＶG＝１０００−１０Ａ、 Ｖm＝ＶC＋ＶS＋ＶG
従って、Ｖm＝(１０００−１０Ａ)−Ｗ
ここで、ＣV：試料の空気を除いた材料容積(ｌ／ｍ3)
Ａ：エアーメータで得られた試料の空気量(％)
Ｖm：試料の水を除いた材料容積(ｌ／ｍ3)
セメントは骨材に比べて計量設定値が小さく、計量許容差も小さいので計量値は殆ど変動しない。又セメントの密度も殆ど変動しない。セメントの密度は骨材に比べて大きいので、水を除いた材料容積Ｖmに占めるセメント容積の割合は小さい。試料の水を除いた材料密度も計画配合上の水を除いた材料密度に対して変動しないのであるから、水を除いた材料容積に占めるセメントの容積の比率も殆ど変動しない。
In the present invention, the actual water-cement ratio of ready-mixed concrete can be estimated with high accuracy.
Since the sample air amount A% and the unit water amount W (kg / m 3 ) are obtained, the sample water C V = W + V C + V S + V G = 1000−10 A, V m = V C + V S + V G
Therefore, V m = (1000−10 A) −W
Where C V : material volume excluding sample air (l / m 3 )
A: Air volume (%) of the sample obtained with an air meter
V m : material volume excluding water of sample (l / m 3 )
Since cement has a smaller measurement set value and smaller measurement tolerance than aggregate, the measurement value hardly fluctuates. Also, the density of the cement hardly fluctuates. Since the density of cement is higher than that of aggregate, the proportion of cement volume in the material volume V m excluding water is small. Since the material density excluding water of the sample does not vary with respect to the material density excluding water in the planned formulation, the ratio of the cement volume to the material volume excluding water hardly varies.
従って、実単位セメント量は次の式で求めることが出来る。 Therefore, the actual unit cement amount can be obtained by the following equation.
ＶC＝Ｖm×(ＶCO／ＶmO)
Ｃ＝ＶC×ρс
ここで、ＶC：試料のセメント容積(ｌ／ｍ3)
Ｖm：試料の水を除いた材料容積(ｌ／ｍ3)
ＶmO：配合上の水を除いた材料容積(ｌ／ｍ3)
ＶCO：配合上のセメント容積(ｌ／ｍ3)
Ｃ：試料の実単位セメント量(ｋｇ／ｍ3)
ρс：セメントの密度(ｇ／ｃｍ3)
従って、水セメント比が次の式で求めることが出来る。
V C = V m × (V CO / V mO )
C = V C × ρс
Where V C : Cement volume of the sample (l / m 3 )
V m : material volume excluding water of sample (l / m 3 )
V mO : Volume of material excluding water on formulation (l / m 3 )
V CO : Cement volume on blending (l / m 3 )
C: Sample actual unit cement amount (kg / m 3 )
ρс: Cement density (g / cm 3 )
Therefore, the water cement ratio can be obtained by the following formula.
Ｗ／Ｃ＝(Ｗ／Ｃ)×１００
ここで、Ｗ／Ｃ：試料の水セメント比(％)
Ｗ：本発明の得られる単位水量(ｋｇ／ｍ3)
Ｃ：試料の実単位セメント量(ｋｇ／ｍ3)
W / C = (W / C) × 100
Where W / C: water cement ratio of sample (%)
W: Unit water amount obtained by the present invention (kg / m 3 )
C: Sample actual unit cement amount (kg / m 3 )
本発明は従来から多用されているエアーメータを利用し、これに上記式で表示される方法を組み込んだものである。従って、如何なる配合の生コンクリートの場合にも適用できる実用的な方法であり、簡単にしかも高精度で生コンクリートの単位水量及び水とセメント比を推定することが可能と成る。コンクリートの耐久性向上が求められる中、生コンクリートの生産者及び施工業者が生コンクリートの品質を保証する上からも、本発明に係る生コンクリートの単位水量測定方法が適用され、コンクリート構造物の耐久性向上に寄与することが出来る。 The present invention uses an air meter that has been widely used in the past, and incorporates the method represented by the above formula. Therefore, it is a practical method that can be applied to any mix of ready-mixed concrete, and can easily and accurately estimate the unit water amount and the water-cement ratio of ready-mixed concrete. With the demand for improving the durability of concrete, the method for measuring the unit water content of ready-mixed concrete according to the present invention is applied in order to guarantee the quality of ready-mixed concrete by producers and contractors of ready-mixed concrete. It can contribute to improvement of the property.
図１は本発明に係る生コンクリートの単位水量測定方法を示すフローチャートの概略図である。
(１)計画配合表により、計算機(ＰＤＡ)に各材料基礎データを入力し、又エアーメータのデータを入力する。ここで、上記計算機(ＰＤＡ)には、単位水量計算専用のソフトが入力されている。すなわち、上記単位水量Ｗを求める式、水セメント比Ｗ／Ｃを求める式が入力されている。
(２)試料を採取してエアーメータにより質量を測定する。
(３)エアーメータにて空気量を測定する。
(４)この空気量を計算機(ＰＤＡ)に入力して単位水量を計算し、その結果を表示する。
(５)パソコンへ送信し、データを入力処理し、データを蓄積、解析する。そして、必要に応じて印刷する。
FIG. 1 is a schematic view of a flowchart showing a method for measuring a unit water amount of ready-mixed concrete according to the present invention.
(1) Enter the basic data of each material into the computer (PDA) and the data of the air meter according to the plan recipe. Here, software dedicated to unit water volume calculation is input to the computer (PDA). That is, an equation for obtaining the unit water amount W and an equation for obtaining the water cement ratio W / C are input.
(2) Collect a sample and measure the mass with an air meter.
(3) Measure the air volume with an air meter.
(4) Input this air amount into a computer (PDA), calculate the unit water amount, and display the result.
(5) Send to a PC, process the data, store and analyze the data. And it prints as needed.
エアーメータとは、従来から使用されている測定機器であって、圧力計、空気ハンドポンプ、調圧弁、排気弁、圧平衡弁作動レバー、ペット・コック、クランプ、三脚ガイド、及び持ち手を有している。このエアーメータを用いて生コンクリート内の空気量を測定する。これには注水法と無水法が存在している。 An air meter is a conventional measuring instrument that has a pressure gauge, pneumatic hand pump, pressure regulating valve, exhaust valve, pressure balancing valve operating lever, pet cock, clamp, tripod guide, and handle. is doing. This air meter is used to measure the amount of air in the ready-mixed concrete. There are water injection method and anhydrous method.
〔注水法〕
(１)湿布で容器の内面及び蓋の裏面を拭いて湿らす。
(２)生コンクリートを容器の約１／３まで入れ、ならした後で容器の底を突かないように各層を突き棒で２５回均等に突く。突き穴がなくなり、コンクリート表面に大きな泡が見えなくなるようにする為に、容器の側面を１０〜１５回木槌で叩く。次に生コンクリートを容器の２／３まで入れ、前回と同様の操作を繰り返す。最後に容器から少しあふれる程度に生コンクリートを入れ、同様の操作を繰り返した後、ストレートエッジで余分な生コンクリートをかきとり、コンクリート表面と容器上面を一致させる。
(３)振動機で締め固めることも出来るが、ＪＩＳ Ａ １１１６の４．２に準じて行う。
(４)容器のフランジ上面と、蓋のフランジ下面を完全にぬぐった後、ペット・コックを開き、蓋の内外を通気できるようにして静かに蓋を容器に取付け、クランプによって空気が漏れないように均等に締め付ける。
(５)排気弁を緩め、スポイトでペット・コックから静かに注水し、蓋の裏面と生コンクリートの表面との間の空気が追い出されるまで注水する。気泡が追い出されたことを確認後、ペット・コックを閉じ、続いて排気弁も完全に閉じる。この際、容器は水平に保持される。
(６)排気弁、調整弁及びペット・コックを全て閉じ、空気ハンド・ポンプで空気室の圧力を初圧力線より僅かに大きくする。約５秒後に調圧弁を徐々に開いて圧力計の指針を初圧力線に正しく一致させる。圧力計は赤黒２通りに目盛らせているが、注水法の場合は黒目盛りと成っている。
(７)圧平衡弁作動レバーを押下げ、充分に開放する。開放し終えた後、作動レバーを元に戻し、コンクリートの各部に圧力を行き渡らせるために容器の側面を小槌で叩く。
(８)再度、作動レバーを充分に開放し、圧力を平衡させ、圧力計の指針が安定してから指先で軽く叩いて圧力計の空気量の目盛りを読み取る。この読みが生コンクリートの空気量Ａ1と成り、次の式で算出される。
[Water injection method]
(1) Wipe and wet the inner surface of the container and the back of the lid with a compress.
(2) Put the ready-mixed concrete to about 1/3 of the container, and after leveling, poke each layer evenly 25 times with a stick so as not to hit the bottom of the container. Beat the side of the container 10-15 times with a mallet so that there are no holes and no large bubbles are visible on the concrete surface. Next, put the ready-mixed concrete up to 2/3 of the container and repeat the same operation as before. Finally, put the ready-mixed concrete so that it overflows a little from the container, repeat the same operation, scrape off the fresh ready-made concrete with a straight edge, and make the concrete surface and the upper surface of the container match.
(3) Although it can be compacted with a vibrator, it is performed according to JIS A 1116 4.2.
(4) After the upper surface of the container flange and the lower surface of the cover flange are completely wiped out, the pet cock is opened, the cover is gently attached to the container so that the inside and outside of the cover can be ventilated, and air is not leaked by the clamp. Tighten evenly.
(5) Loosen the exhaust valve and gently pour water from the pet cock with a dropper until the air between the back of the lid and the surface of the ready-mixed concrete is expelled. After confirming that the bubbles have been expelled, close the pet cock and then completely close the exhaust valve. At this time, the container is held horizontally.
(6) Close all exhaust valves, regulating valves and pet cocks, and make the air chamber pressure slightly higher than the initial pressure line with the air hand pump. After about 5 seconds, the pressure regulating valve is gradually opened so that the pressure gauge pointer correctly matches the initial pressure line. The pressure gauge is calibrated in two ways, red and black, but in the case of the water injection method, it has a black scale.
(7) Push down the pressure balancing valve operating lever and fully open it. After opening, return the operating lever and tap the side of the container with a spatula to spread the pressure on each part of the concrete.
(8) Again, release the operating lever sufficiently, equilibrate the pressure, and after the pointer of the pressure gauge has stabilized, tap lightly with the fingertip and read the scale of the air amount of the pressure gauge. This reading becomes the air amount A 1 of the ready-mixed concrete and is calculated by the following formula.
Ａ＝Ａ1−Ｇ
ここで、Ａ：コンクリートの空気量(％)
Ａ1：コンクリートの見かけの空気量(％)
Ｇ：骨材修正係数
〔無注水法〕
(１)湿布で容器の内面及び蓋の裏面を拭いて湿らす。
(２)生コンクリートを容器の約１／３まで入れ、ならした後で容器の底を突かないように各層を突き棒で２５回均等に突く。突き穴がなくなり、コンクリート表面に大きな泡が見えなくなるようにする為に、容器の側面を１０〜１５回木槌で叩く。次に生コンクリートを容器の２／３まで入れ、前回と同様の操作を繰り返す。最後に容器から少しあふれる程度に生コンクリートを入れ、同様の操作を繰り返した後、ストレートエッジで余分な生コンクリートをかきとり、コンクリート表面と容器上面を一致させる。
(３)振動機で締め固めることも出来るが、ＪＩＳ Ａ １１１６の４．２に準じて行う。
(４)容器のフランジ上面と、蓋のフランジ下面を完全にぬぐった後、ペット・コックを開き、蓋の内外を通気できるようにして静かに蓋を容器に取付け、クランプによって空気が漏れないように均等に締め付ける。
(６)排気弁、調整弁及びペット・コックを全て閉じ、空気ハンド・ポンプで空気室の圧力を初圧力線より僅かに大きくする。約５秒後に調圧弁を徐々に開いて圧力計の指針を初圧力線に正しく一致させる。圧力計は赤黒２通りに目盛らせているが、無注水法の場合は赤目盛りと成っている。
(７)圧平衡弁作動レバーを押下げ、充分に開放する。開放し終えた後、作動レバーを元に戻し、コンクリートの各部に圧力を行き渡らせるために容器の側面を小槌で叩く。
(８)再度、作動レバーを充分に開放し、圧力を平衡させ、圧力計の指針が安定してから指先で軽く叩いて圧力計の空気量の目盛りを読み取る。この読みが生コンクリートの空気量Ａ1と成り、次の式で算出される。
A = A 1 −G
Where: A: Concrete air volume (%)
A 1 : Apparent air volume of concrete (%)
G: Aggregate correction factor [No water injection method]
(1) Wipe and wet the inner surface of the container and the back of the lid with a compress.
(2) Put the ready-mixed concrete to about 1/3 of the container, and after leveling, poke each layer evenly 25 times with a stick so as not to hit the bottom of the container. Beat the side of the container 10-15 times with a mallet so that there are no holes and no large bubbles are visible on the concrete surface. Next, put the ready-mixed concrete up to 2/3 of the container and repeat the same operation as before. Finally, put the ready-mixed concrete so that it overflows a little from the container, repeat the same operation, scrape off the fresh ready-made concrete with a straight edge, and make the concrete surface and the upper surface of the container match.
(3) Although it can be compacted with a vibrator, it is performed according to JIS A 1116 4.2.
(4) After the upper surface of the container flange and the lower surface of the cover flange are completely wiped out, the pet cock is opened, the cover is gently attached to the container so that the inside and outside of the cover can be ventilated, and air is not leaked by the clamp. Tighten evenly.
(6) Close all exhaust valves, regulating valves and pet cocks, and make the air chamber pressure slightly higher than the initial pressure line with the air hand pump. After about 5 seconds, the pressure regulating valve is gradually opened so that the pressure gauge pointer correctly matches the initial pressure line. The pressure gauge is calibrated in two ways, red and black, but in the case of the non-water injection method, it is a red scale.
(7) Push down the pressure balancing valve operating lever and fully open it. After opening, return the operating lever and tap the side of the container with a spatula to spread the pressure on each part of the concrete.
(8) Again, release the operating lever sufficiently, equilibrate the pressure, and after the pointer of the pressure gauge has stabilized, tap lightly with the fingertip and read the scale of the air amount of the pressure gauge. This reading becomes the air amount A 1 of the ready-mixed concrete and is calculated by the following formula.
Ａ＝Ａ1−Ｇ
ここで、Ａ：コンクリートの空気量(％)
Ａ1：コンクリートの見かけの空気量(％)
Ｇ：骨材修正係数
図２〜図７は計算機(ＰＤＡ)を用いて単位水量を演算する手順を示している。
図２は単位水分量推定システムの表示画面であり、このシステムには本件発明に係る「福井式エアーメータ法」の他に、高周波加熱乾燥法、土木研究所方(厳密式)、及び土木研究所法(簡易式)の４方式のプログラムが掲載されている。
A = A 1 −G
Where: A: Concrete air volume (%)
A 1 : Apparent air volume of concrete (%)
G: Aggregate correction coefficient FIGS. 2-7 has shown the procedure which calculates unit water quantity using a computer (PDA).
Fig. 2 shows the display screen of the unit moisture content estimation system. In addition to the "Fukui-type air meter method" according to the present invention, this system includes a high-frequency heating drying method, a civil engineering research laboratory (strict formula), and civil engineering research. There are four programs of the method (simple method).
図３は配合表を基にして、水、セメント、細骨材、粗骨材、混和材、及び空気量の単位重量値を入力した場合である。図４は次の表示画面を出して、水、セメント、細骨材、粗骨材の密度が入力される。図５は水分量を算出するに当たって、無注水法と注水法の２方法があり、何れかを選択する。図６はエアーメータによって得られた空気量、測定質量、並びにスランプ、生コンクリートの温度を所定の箇所に入力した場合である。 FIG. 3 shows a case where unit weight values of water, cement, fine aggregate, coarse aggregate, admixture, and air amount are input based on the recipe. FIG. 4 shows the next display screen in which the density of water, cement, fine aggregate, and coarse aggregate is input. In FIG. 5, there are two methods, ie, a non-water-injection method and a water-injection method, for selecting the water content. FIG. 6 shows a case where the air amount obtained by the air meter, the measured mass, and the temperature of the slump and ready-mixed concrete are input to predetermined locations.
そして、図７は単位水量の算定結果を表している。該表示画面には推定単位水量が１９８．７ｋｇ／ｍ3と表示される。この値が規定の範囲内にあれば、この生コンクリートを使用することが出来、逆に規定の範囲外となれば使用できない。勿論、上記推定単位水量１９８．７ｋｇ／ｍ3は１具体例に過ぎない。 FIG. 7 shows the calculation result of the unit water amount. On the display screen, the estimated unit water amount is displayed as 198.7 kg / m 3 . If this value is within the specified range, this ready-mixed concrete can be used, and conversely, if it falls outside the specified range, it cannot be used. Of course, the estimated unit water amount 198.7 kg / m 3 is only one specific example.
Claims (2)
ここでＴ：実測単位容積質量
Ａ：実測空気量
ρ：セメント、細骨材、粗骨材の合計単位容積質量 In the method of calculating the amount of water contained in ready-mixed concrete, the air content is measured by packing ready-mixed concrete in an air meter container, while using a computer (PDA) programmed with the following formula. Enter water, cement, fine aggregate, coarse aggregate, admixture, and air volume measured with an air meter, and the density of water, cement, fine aggregate, and coarse aggregate. A method for measuring and calculating the unit water content of ready-mixed concrete, further comprising inputting the air amount (%) measured with an air meter, the measured mass (kg), and the temperature (° C.) of slump and ready-mixed concrete.
Where T: measured unit volume mass A: measured air volume ρ: total unit volume mass of cement, fine aggregate, coarse aggregate
ここでＴ：実測単位容積質量
Ａ：実測空気量
ρ：セメント、細骨材、粗骨材の合計単位容積質量
これに生コンクリートの成分となる水、セメント、細骨材、粗骨材、混和材、そしてエアーメータにて測定した空気量を入力し、又水、セメント、細骨材、粗骨材の密度を入力し、さらにエアーメータで測定した空気量(％)、測定質量(ｋｇ)、並びにスランプ、生コンクリートの温度(℃)を入力して算定し、実際の生コンクリートの水セメント比を高精度に算出する方法を搭載した生コンクリートの単位水量測定システム。 In a system that measures the unit moisture content contained in ready-mixed concrete, the amount of air is measured by packing ready-mixed concrete in an air meter container,
Where T: measured unit volume mass A: measured air volume ρ: total unit volume mass of cement, fine aggregate, and coarse aggregate Water, cement, fine aggregate, coarse aggregate, admixture of raw concrete components Enter the amount of air measured with the air meter and the air meter, enter the density of water, cement, fine aggregate and coarse aggregate, and further measure the air amount (%) and measured mass (kg) measured with the air meter. A unit water volume measurement system for ready-mixed concrete, equipped with a method to calculate slump and ready-mixed concrete temperature (℃) and calculate the actual ready-mixed water-cement ratio with high accuracy.
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| JP4971273B2 (en) * | 2008-09-11 | 2012-07-11 | 株式会社奥村組 | Method for estimating the unit water volume of concrete using an air meter |
| JP2011180014A (en) * | 2010-03-02 | 2011-09-15 | Maruto Seisakusho:Kk | Measuring instrument for unit water quantity of ready-mixed concrete |
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