JPS5843696B2 - Preliminary inspection method for concrete quality - Google Patents
Preliminary inspection method for concrete qualityInfo
- Publication number
- JPS5843696B2 JPS5843696B2 JP16987479A JP16987479A JPS5843696B2 JP S5843696 B2 JPS5843696 B2 JP S5843696B2 JP 16987479 A JP16987479 A JP 16987479A JP 16987479 A JP16987479 A JP 16987479A JP S5843696 B2 JPS5843696 B2 JP S5843696B2
- Authority
- JP
- Japan
- Prior art keywords
- mortar
- amount
- water
- cement
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
【発明の詳細な説明】 本発明は、生コンクリートの現場受入れ時に。[Detailed description of the invention] The present invention can be used at the time of receiving ready-mixed concrete on-site.
硬化後のコンクリート強度を予測判定して、つまり、コ
ンクリート打設の前に、その生コンクリートが硬化後に
必要強度が得られる品質であるか否かを敏速に検査して
１重大な損失の発生を防止できるコンクリート品質の事
前検査方法を提供するものである。By predicting and determining the strength of concrete after hardening, that is, before placing concrete, it is possible to promptly test whether the fresh concrete is of a quality that will provide the required strength after hardening, and thereby prevent serious losses. This provides a method for pre-inspecting concrete quality that can prevent such problems.
コンクリートの品質に関しては、 ＪＩＳ Ａ３３０及
びＪＡＳＳ５等の規定があるが、構造体にとって最も重
要な「強度」については、いずれの場合も硬化後の圧縮
強度試験によるいわば事後判定法であるため、後手管理
とならざるを得ない。Regarding the quality of concrete, there are regulations such as JIS A330 and JASS5, but in any case, the most important "strength" for a structure is a post-cure judgment method based on a compressive strength test after hardening, so ex-post management is required. I have no choice but to do so.
殊に、近年では、生コンクリートの流通機構の複雑化、
生コン協同組合による共販制度の実施に伴い、工程能力
の異なる数社の生コンメーカーから購入しなければなら
ないこともあって、生コン工場への立入検査等によるき
め細かい品質管理は不可能に近く、購入者の技術的義務
である品質検査が前述の通り後手管理になっているのが
現状である。In particular, in recent years, the distribution mechanism of ready-mixed concrete has become more complex,
Due to the implementation of a joint sales system by ready-mixed concrete cooperatives, it is necessary to purchase from several ready-mixed concrete manufacturers with different processing capabilities, making it nearly impossible to perform detailed quality control through on-site inspections of ready-mixed concrete factories. As mentioned above, the current situation is that quality inspection, which is a technical obligation for manufacturers, has become a reactive management task.
従って、上記の事後判定法によって悪い判定結果（強度
不足）が出た場合、新設された建物を破壊し、廃棄しな
ければならず、経済的には、新設タルとセメント量測定
用モルタルとを各々一定重量ずつ採取するため１例えば
前者を一定量（ＣＣ）採取し、後者を一定重量（ｇ）採
取したり、あるいは、両者の採取重量（，９）を異にす
る場合に比べて、計測が単純で採取が容易であるばかり
でなく１両者のモルタルによって測定した水量とセメン
ト量とから直ちに水セメント比を算出でき、しかも、上
記の通り１モルタル水中重量に基づいて水量を求め、懸
濁液の比重に基づいてセメント量を求めるため。Therefore, if a bad judgment result (insufficient strength) is obtained by the above ex-post judgment method, the newly built building must be destroyed and disposed of, and economically it is difficult to use the newly built tar and the mortar for measuring the amount of cement. In order to collect a constant weight of each, for example, the former is collected in a constant amount (CC) and the latter is collected in a constant weight (g), or the two are collected at different weights (,9). Not only is it simple and easy to collect, but the water-cement ratio can be calculated immediately from the amount of water and cement measured in both mortars.Moreover, as mentioned above, the amount of water can be determined based on the weight of one mortar in water, and the suspension To determine the amount of cement based on the specific gravity of the liquid.
加熱源や劇薬を使用せず、誰にでも簡単に実施でき、加
えて、セメント量測定用モルタルの懸濁及びその比重に
よるセメント量の測定作業を、水量測定用モルタルの静
置時間内に行なうため、測定作業時間のロスが少なく、
これらによって、結果が判明するまでに要する時間を約
１５分以内に抑えることが可能である。It can be easily carried out by anyone without the use of heat sources or powerful chemicals, and in addition, the work of suspending the mortar for measuring the amount of cement and measuring the amount of cement by its specific gravity can be done within the time the mortar for measuring the amount of water is allowed to stand. Therefore, there is less loss in measurement work time.
These methods make it possible to reduce the time required for results to be known within about 15 minutes.
従って、現場搬入された生コンクリートを打設する以前
に、該生コンク１１−トが硬化後に必要強度の得られる
品質であるか否かを検査でき、前述の如き重大な損失の
発生を予防できるのである。Therefore, before pouring the ready-mixed concrete delivered to the site, it is possible to inspect whether the ready-mixed concrete is of a quality that will provide the necessary strength after hardening, and it is possible to prevent the occurrence of serious losses as described above. It is.
以下１本発明に係るコンクリート品質の事前検査方法の
一実施例を図面に基づいて説明する。An embodiment of the concrete quality preliminary inspection method according to the present invention will be described below with reference to the drawings.
■ モルタル試料の採取
■ 生コン車からの荷降し地点で、排出の中間時にバケ
ツ１に半分程度（２〜３７）の生コンクリートを採取す
る。■ Collection of mortar sample ■ At the unloading point from the ready-mixed concrete truck, about half of the ready-mixed concrete (2 to 37) is collected in bucket 1 midway through the discharge.
■ 採取した生コンクＩＪ−トを直ちに５ｍｒＩｔ篩２
で、砂利とモルタルとに篩分けする。■ Immediately pass the collected raw concrete IJ-t through a 5mrIt sieve 2.
Then, it is sieved into gravel and mortar.
■ 篩２を通過したモルタルを均一になるように練り返
し、２つの５００ＣＣビーカー３ａ。■ Knead the mortar that has passed through the sieve 2 until it is homogeneous, and then pour it into two 500CC beakers 3a.
３ｂに、練りさじで交互に入れ、各々４００ｇの水量測
定用モルタルａ及びセメント量泪１１定用モルタルｂを
測りとる。3b, alternately measure 400 g of mortar A for measuring water amount and mortar B for determining cement amount 11 by placing them alternately with a mixing spoon.
■ セメント量の決定
■ セメント量測定用モルタル４０１を測りとったビー
カー３ｂに水を加え、残さず
１、０００ ＣＣのメスシリンダー４に移す。■Determining the amount of cement■ Add water to the beaker 3b in which the mortar 401 for measuring the amount of cement was measured, and transfer it to the measuring cylinder 4 of 1,000 cc without leaving anything behind.
その上に分散剤の一例としてホゾリス４７０
（２０％溶液）５ｃｃ及び水を加え、全体で１０００Ｃ
Ｃとする。Add 5 cc of Hozolith 470 (20% solution) and water as an example of a dispersant, and the total temperature was 1000 C.
Let it be C.
■ 前記メスシリンダー４にゴム栓５をし、底と上部を
押えて上下に転倒する操作を３０秒間で１２回繰返す。(2) Put a rubber stopper 5 on the measuring cylinder 4, press the bottom and top, and repeat the operation of tipping it up and down 12 times in 30 seconds.
■ 前記メスシリンダー４を静置後、３０秒間の費用、
破壊及び廃棄の費用がすべて損失であり。■ After leaving the measuring cylinder 4 still, the cost for 30 seconds;
All costs of destruction and disposal are losses.
場合によっては一つの建物で１００億円以上の損失にも
なり得る。In some cases, a single building can result in losses of more than 10 billion yen.
また、建設技術一般に対する社会的信頼が揺らぎ、当然
事故当事者の技術的１社会的信頼は失墜することになる
。In addition, social trust in construction technology in general will be shaken, and of course the technical and social trust of those involved in the accident will be lost.
以上のことから１本発明者は、コンクリート強度と相関
の高い代用特性である水セメント比に注目し、生コンク
リートの荷降し地点で水セメント比を即座に判定するこ
とにより品質不良な生コンクリートを見い出せるように
、しかも、生コンクリートの現場搬入から打設開始まで
の時間にてらして結果が判明するまでに要する時間が約
１５分以内であること、推定精度が水セメント比で±２
％以内であること、加熱源や劇薬を使用せず誰にでも簡
単に実施できること、装置一式の費用を約１０万円以下
に抑え得ること等々を目標として。Based on the above, the present inventor focused on the water-cement ratio, which is a substitute characteristic that has a high correlation with concrete strength, and determined that the water-cement ratio can be immediately determined at the unloading point of the ready-mixed concrete to prevent poor quality ready-mixed concrete. In addition, the time required for the results to be known from the time the ready-mixed concrete is brought to the site to the start of pouring is approximately 15 minutes or less, and the estimation accuracy is ±2 in terms of water-cement ratio.
%, that anyone can easily perform the process without using heat sources or powerful chemicals, and that the cost of the entire device can be kept to about 100,000 yen or less.
鋭意研究の結果１次のようなコンクリート品質の事前検
査方法を確立したのである。As a result of intensive research, we established the following pre-inspection method for concrete quality.
即ち、本発明によるコンクリート品質の事前検査方法は
、現場設入された生コンクリートの一部を採取して篩分
けし、篩下モルタルから水量測定用の試料にするモルタ
ルとセメント量測定用の試料とするモルタルとを各々一
定重量ずつ採取し。That is, in the concrete quality pre-inspection method according to the present invention, a part of fresh concrete placed on site is sampled and sieved, and the mortar under the sieve is used as a sample for measuring the amount of water and mortar and cement. Collect a certain weight of each mortar.
前記水量測定用モルタルに水を加えて攪拌し、数分間静
置した後、風袋を含めた全体の空中重量を測定すると共
に該測定値から風袋の重量及び風袋容積弁の水の重量を
減算することによって該モルタルの水中重量を求める一
方、前記の静置時間内に、前記セメント量測定用モルタ
ルに一定量の分散剤と水を加え攪拌して一定量の懸濁液
を作製し。Water is added to the mortar for measuring the amount of water, stirred, and left to stand for several minutes. Then, the entire air weight including the tare is measured, and the weight of the tare and the weight of the water in the tare volume valve are subtracted from the measured value. While determining the weight of the mortar in water, a certain amount of dispersant and water were added to the mortar for cement amount measurement and stirred to prepare a certain amount of suspension during the standing time.
該懸濁液の静置後一定時間の比重と温度を測定して比重
測定値の温度補正を行ない、予め調合の知られたモルタ
ルによって求めておいた比重測定値とセメント量との関
係を示すデータに基づいて前記の温度補正された比重測
定値に対応するセメント量を求め、しかる後、前記モル
タル採取重量と前記モルタル水中重量と前記セメント量
ならびに予め知られたセメント及び細骨材の比重とに基
づいて水量を求め、該水量と前記セメント量とから水セ
メント比を求めることによって、コンクリート打設以前
に、前記生コンクＩＪ−トが硬化後に必要強度の得られ
る品質であるか否かを検査することを特徴とする。The specific gravity and temperature are measured for a certain period of time after the suspension has been allowed to stand still, and the measured specific gravity is corrected for the temperature, and the relationship between the measured specific gravity and the amount of cement determined in advance using a mortar with a known formulation is shown. Based on the data, determine the amount of cement corresponding to the temperature-corrected specific gravity measurement value, and then calculate the mortar sample weight, the mortar weight in water, the cement amount, and the pre-known specific gravity of cement and fine aggregate. By determining the amount of water based on the amount of water and determining the water-cement ratio from the amount of water and the amount of cement, it is possible to determine whether the ready-mixed concrete IJ is of a quality that will provide the necessary strength after hardening, before concrete placement. It is characterized by inspecting.
而して、上記の方法によれば、水量測定用モルに懸濁液
の表面に浮いている泡をスポイト６で完全に除去する。According to the above method, the bubbles floating on the surface of the suspension are completely removed using the dropper 6.
■ ＠記メスシリンダー４を静置した３０〜４０秒後に
、比重計７を挿入し、静置後１分及び２分の比重計７の
読みを測定する。(2) 30 to 40 seconds after leaving the graduated cylinder 4 still, insert the hydrometer 7, and measure the readings of the hydrometer 7 at 1 minute and 2 minutes after leaving the graduated cylinder 4 still.
■ ２分後の比重計７の読みを測定した後、直ちに温度
計８を挿入して懸濁液の温度を測る。■ After measuring the reading of the hydrometer 7 after 2 minutes, immediately insert the thermometer 8 to measure the temperature of the suspension.
■ 前記■〜■の操作をもう１回行なう。■ Perform the operations from ■ to ■ above one more time.
■ 静置後１分及び２分の比重計７の読みを１５°Ｃの
標準源ｉの時の読みに補正する。- Correct the readings of the hydrometer 7 for 1 minute and 2 minutes after standing still to the readings for standard source i at 15°C.
この温度補正は１次のようにして行なわれる。This temperature correction is performed in a first-order manner.
即ち、測定温度をθとすると、θが１０〜２０’Ｃであ
る場合、（θ−１５）×０．０００２５を比重計７の読
み値に加え、θが２０〜３０℃の場合には、（θ−１５
）Ｘｏ、０００３を比重計７の読み値に加えるのである
。That is, if the measured temperature is θ, if θ is 10 to 20'C, add (θ-15) x 0.00025 to the reading of the hydrometer 7, and if θ is 20 to 30°C, (θ-15
)Xo, 0003 is added to the hydrometer 7 reading.
■ 温度補正した静置後１分及び２分の２回比重計７の
読みのそれぞれの平均値を求める。■ Calculate the average value of the readings of the hydrometer 7 twice, 1 minute and 2 minutes after the temperature has been corrected.
■ 予め調合の分かったモルタルによって求めておいた
比重計７の読みとセメント量との関係を示すデータに基
づいて、前記■により求めた静置後１分及び２分の比重
計７の読み値に対するセメント量を求め、その平均値を
セメント量Ｃとする。■ Based on the data showing the relationship between the reading on the hydrometer 7 and the amount of cement obtained using a mortar whose composition is known in advance, the reading on the hydrometer 7 at 1 minute and 2 minutes after standing still, obtained in step () above. The amount of cement is calculated for the amount of cement, and the average value is set as the amount of cement C.
前記のデータとしては、例えば、細骨材とセメントとの
比Ｓ／ｃを１．５ 、２．２ 、２．５とした３種類の
モルタルを用い、各々のモルタルについて比重計１の読
みとセメント量との関係を実験により調べて、縦軸を比
重計７の読み、横軸をセメント量とするグラフ上に、基
準線９（３本であるが。For the above data, for example, three types of mortar with a fine aggregate to cement ratio S/c of 1.5, 2.2, and 2.5 are used, and the reading of hydrometer 1 and the reading of hydrometer 1 for each mortar are used. The relationship with the amount of cement was investigated through experiments, and the reference lines 9 (although there were three) were drawn on a graph with the reading of the hydrometer 7 on the vertical axis and the amount of cement on the horizontal axis.
図面上２本を省略しである。Two lines are omitted from the drawing.
）を記入しておく。).
そして、現場搬入（購入）される生コンクリートのＳｉ
Ｃが、■、５である場合には。Then, the Si of ready-mixed concrete delivered (purchased) to the site
If C is ■, 5.
これに対応する基準線を用い、２．２や２．５である場
合には、それらに対応する基準線を用いて、該基準線か
ら、比重計γの読みに対応するセメント量Ｃを求めるの
である。Using the reference line corresponding to this, if it is 2.2 or 2.5, use the corresponding reference line to find the amount of cement C corresponding to the reading of hydrometer γ from the reference line. It is.
■ 水量の決定
■ 水量測定用モルタル４０（Ｂｉ’を測りとったビー
カー３ａに水を加え、残さず５００ＣＣの三角フラスコ
１０に移す。■Determination of water amount■ Add water to the beaker 3a in which the water amount measurement mortar 40 (Bi' was measured), and transfer it to a 500CC Erlenmeyer flask 10 without leaving anything behind.
肩口付近まで注水し、撹拌棒で１分間攪拌して試料中の
空気を追い出す。Pour water up to the shoulder area and stir with a stirring rod for 1 minute to expel air from the sample.
■ １分間攪拌した試料を７分間静置して、再度１分間
攪拌する。■ The sample was stirred for 1 minute, left to stand for 7 minutes, and stirred again for 1 minute.
■ 攪拌後、水を三角フラスコ１０の口まで加え、２分
間静置して試料の沈降を待ち、空気をまき込まないよう
にガラス板１１で蓋をする。(2) After stirring, add water to the mouth of the Erlenmeyer flask 10, leave it for 2 minutes to wait for the sample to settle, and cover it with a glass plate 11 to prevent air from entering.
■ 三角フラスコ１０及びガラス板１１を含めた全体の
空中重量Ｑを測定する。(2) Measure the air weight Q of the entire flask including the Erlenmeyer flask 10 and the glass plate 11.
■ 全体重量Ｑを測定した後、温度計８を挿入して、試
料の温度θｎを測る。(2) After measuring the overall weight Q, insert the thermometer 8 and measure the temperature θn of the sample.
■ 下記の式により１モルタルａの水中重量Ｕを求める
。■ Find the weight U of 1 mortar a in water using the following formula.
Ｕ＝Ｑ−（（三角フラスコの内容積） Ｘ （００時の水の密度） （内容積測定時の水の密度）＋”’５．ｚ板。U=Q-((Inner volume of Erlenmeyer flask) X (density of water at 00) (Density of water when measuring internal volume) +”’5.z board.
重量）＋（三角フラスコの重量））
尚、温度θｎによる水の密度の変化に起因する誤差は極
めて小さく、無視できるため、温度θｎの測定を省略し
てもよい。Weight) + (Weight of Erlenmeyer flask)) Note that the error caused by the change in water density due to temperature θn is extremely small and can be ignored, so the measurement of temperature θn may be omitted.
■ 前記モルタル水中重量Ｕ、予め知られているセメン
トの比重ＧＯ及び細骨材の比重Ｇ ｓ 。(2) The weight of the mortar in water U, the specific gravity GO of the cement known in advance, and the specific gravity G s of the fine aggregate.
前記■項で基めたセメント量Ｃから１次式によって、細
骨材Ｓを求める。The fine aggregate S is determined from the cement amount C based on the above item (■) using a linear equation.
ＧＳ ＧＯｌ ５＝Ｘ（Ｕ−ＸＣ） Ｇｓ Ｉ Ｇ。GS GOl 5=X(U-XC) Gs I G.
■ ４０１ｉ’中のセメント量Ｃ及び細骨材Ｓの残りが
水であるとして、下記の式により水量Ｗを求める。(2) Assuming that the cement amount C and the remainder of the fine aggregate S in 401i' are water, the water amount W is determined by the following formula.
Ｗ＝４００−（Ｃ＋Ｓ ）
■ 水セメント比の決定
■ ■項及び■項で求めたモルタル４０ＣＢ？中に含ま
れるセメント量Ｃと水量Ｗとから、水セメント比Ｗ／ｃ
を計算で求める。W=400-(C+S) ■Determination of water-cement ratio■ Mortar 40CB determined in paragraphs ■ and ■? From the amount of cement C and the amount of water contained in the water, the water-cement ratio W/c
Calculate.
尚、１２は秤であり、秤量２ｋｙ、重量０．１ｇのもの
を使用した。In addition, 12 is a scale, which weighs 2 ky and weighs 0.1 g.
比重計γとしては、測定範囲０．９９５〜１．０５０及
び１．０５０〜１．１００．最小目盛０．０００５のも
のを使用した。The hydrometer γ has a measurement range of 0.995 to 1.050 and 1.050 to 1.100. The one with a minimum scale of 0.0005 was used.
１３は分散剤添加用の１０ＣＣメスシリンダー、１４ａ
、１４ｂは水添加用ガラスビンである。13 is a 10CC graduated cylinder for adding dispersant, 14a
, 14b is a glass bottle for adding water.
表−１は、前記Ｉ、ＩＩ、ＩＩＩ、ＩＶの作業の流れを
示す。Table 1 shows the work flow of I, II, III, and IV.
以上の実施例によれば、生コンクリートの受入れ時に、
約１５分以内に該生コンクリートの水セメント比を測定
でき、水セメント比に基づいて。According to the above embodiment, when receiving fresh concrete,
The water-cement ratio of the fresh concrete can be determined within about 15 minutes, based on the water-cement ratio.
硬化後のコンクリート強度を予測できる。It is possible to predict concrete strength after hardening.
従って、硬化後に強度不足を生じる品質の生コンクリー
ト（水セメント比が異常な生コンクリ−＊ト）を用いて
、それ以降の土木、建築工事を進めてしまうことがない
。Therefore, there is no need to proceed with civil engineering or construction work using ready-mixed concrete of a quality that lacks strength after hardening (ready-mixed concrete with an abnormal water-cement ratio).
尚、上記の検査方法では、ストップウォッチを用いて、
各工程が正確に所定時間内で行なわれるが、「攪拌開始
」、「攪拌停止」、「分散剤の添加」、「水の添加」、
「メスシリンダーの転倒１・・・・・・１２Ｊ、ｒ比重
計の挿入」、「温度計の挿入」等々、各工程で必要な動
作を指示する語句を、予め所定時間ごとに録音テープに
吹き込んでおき。In addition, in the above inspection method, using a stopwatch,
Each step is performed accurately within a predetermined time, but there are times when "start stirring", "stop stirring", "addition of dispersant", "addition of water",
Words and phrases instructing the necessary actions in each process, such as "Overturning the graduated cylinder 1...12J, r inserting the hydrometer", "inserting the thermometer", etc., are recorded onto the recording tape at predetermined intervals. By the way.
該テープを再生しながら上記の各動作を行なうようにす
れば、いちいちスドンプウオツチを目視する必要がない
ため、容易かつ正確に測定作業を行なえ、要員は１名で
済む。If each of the above operations is performed while the tape is being played back, there is no need to visually check the damping watch each time, so the measurement work can be easily and accurately carried out, and only one person is required.
図面は本発明に係るコンクリート品質の事前検査方法の
実施例を示す工程図である。
Ｕ・・・・・・モルタル水中重量、Ｃ・・−・・セメン
ト量。
Ｗ・・・・・・水量、Ｗ／ｃ・・・・・・水セメント比
、ＧＯ・・・・・・セメントの比重、Ｇ ｓ 、、、、
、、細骨材の比重。The drawings are process charts showing an embodiment of the method for pre-inspecting concrete quality according to the present invention. U: Weight of mortar in water, C: Amount of cement. W...Water amount, W/c...Water-cement ratio, GO...Cement specific gravity, G s...
,,Specific gravity of fine aggregate.
Claims (1)
当量採取して５７Ｉｔ７ＩＬ篩で篩分けし、篩下モルタ
ルから水量測定用の試料にするモルタルとセメント量測
定用の試料にするモルタルとを一定重量ずつ採取し、前
記水量測定用モルタルに水を加えて攪拌し、数分間静置
した後、風袋を含めた全体の空中重量を測定すると共に
該測定値から風袋の重量及び風袋容積弁の水の重量を減
算することによって、該モルタルの水中重量Ｕを求める
一方。 前記の静置時間内に、前記セメント量測定用モルタルに
分散剤及び水を加え攪拌して一定量の懸濁液を作製し、
該懸濁液の静置後一定時間の比重と温度を測定して比重
測定値の温度補正を行ない。 予め調合の知られたモルタルによって求めておいた比重
測定値とセメント量との関係を示すデータに基づいて前
記の温度補正された比重測定値に対応するセメント量Ｃ
を求め、モルタル採取重量と前記モルタル水中重量Ｕと
前記セメント量Ｃならびに予め知られたセメント及び細
骨材の比重ＧｃＧ８とに基づいて水量Ｗを求め、該水量
Ｗと前記セメント量Ｃとから水セメント比Ｗ７ｃを求め
ることによってコンクリート打設以前に前記生コンクリ
ートが硬化後に必要強度の得られる品質であるか否かを
検査するコンクリート品質の事前検査方法。[Scope of Claims] 1. A suitable amount of ready-mixed concrete delivered to a civil engineering or construction site is taken and sieved with a 57It7IL sieve, and the mortar under the sieve is used as a sample for measuring the amount of water.A sample for measuring the amount of mortar and cement. Collect a certain amount of mortar and mortar, add water to the mortar for water volume measurement, stir it, let it stand for several minutes, measure the entire air weight including the tare, and calculate the weight of the tare from the measured value. and while determining the underwater weight U of the mortar by subtracting the weight of water in the tare volume valve. During the standing time, add a dispersant and water to the cement amount measuring mortar and stir to create a certain amount of suspension;
After the suspension is allowed to stand still, the specific gravity and temperature are measured for a certain period of time, and the measured specific gravity values are corrected for temperature. Cement amount C corresponding to the temperature-corrected specific gravity measurement value based on data showing the relationship between the specific gravity measurement value and cement amount obtained in advance using a mortar with a known blend.
The amount of water W is determined based on the collected mortar weight, the weight of the mortar in water U, the amount of cement C, and the pre-known specific gravity GcG8 of cement and fine aggregate. A concrete quality preliminary inspection method for inspecting whether the fresh concrete is of a quality that will provide the necessary strength after hardening before concrete placement by determining the cement ratio W7c.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16987479A JPS5843696B2 (en) | 1979-12-25 | 1979-12-25 | Preliminary inspection method for concrete quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16987479A JPS5843696B2 (en) | 1979-12-25 | 1979-12-25 | Preliminary inspection method for concrete quality |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5692455A JPS5692455A (en) | 1981-07-27 |
| JPS5843696B2 true JPS5843696B2 (en) | 1983-09-28 |
Family
ID=15894549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16987479A Expired JPS5843696B2 (en) | 1979-12-25 | 1979-12-25 | Preliminary inspection method for concrete quality |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5843696B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0634011B2 (en) * | 1983-04-20 | 1994-05-02 | 株式会社竹中工務店 | Quality inspection equipment for ready-mixed concrete |
| JPH0623753B2 (en) * | 1987-03-03 | 1994-03-30 | 株式会社竹中工務店 | Soil column strength determination device |
| ITTO20090504A1 (en) * | 2009-07-06 | 2011-01-07 | Embraco Europ Srl | ASSEMBLY PROCEDURE FOR ELECTRIC POWER SUPPLY CABLES TO A STATOR |
| CN104569361B (en) * | 2015-01-06 | 2016-01-20 | 同济大学 | A kind of chemical contraction of cement proving installation and method of testing |
| CN106092766A (en) * | 2016-06-02 | 2016-11-09 | 青神鑫统领建材有限公司 | A kind of assay method of low water-cement ratio strength of cement mortar |
-
1979
- 1979-12-25 JP JP16987479A patent/JPS5843696B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5692455A (en) | 1981-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ghosh et al. | Influence of parameters on surface resistivity of concrete | |
| Spragg et al. | Electrical testing of cement-based materials: Role of testing techniques, sample conditioning, and accelerated curing | |
| US20070179653A1 (en) | Method and system for concrete quality control based on the concrete's maturity | |
| JPS59195159A (en) | Method and device for inspecting quality of ready-mixed concrete | |
| CN108982294A (en) | A kind of V-type funnel device measuring concrete flowability | |
| JPS5843696B2 (en) | Preliminary inspection method for concrete quality | |
| Kolias | Investigation of the possibility of estimating concrete strength by porosity measurements | |
| Chang et al. | Polarisation behaviour of steel bar samples in concrete in seawater. Part 2: A polarisation model for corrosion evaluation of steel in concrete | |
| Spragg | Development of performance related specifications that include formation factor | |
| US20040083057A1 (en) | Method and system for concrete quality control based on the concrete's maturity | |
| Villagrán-Zaccardi et al. | Chloride ingress rate and threshold content, as determined by the ‘Integral’test method, in concrete with several w/c ratios in saturated and unsaturated conditions | |
| Newman et al. | Advanced concrete technology 4: Testing and Quality | |
| Saraswatula et al. | Increasing the Reliability of Formation Factor-Based Transport Property Prediction for High Performance Concrete Mixtures Through Innovative Matching Pore Solution Curing | |
| CA3007868A1 (en) | Device and method for determining rheological properties of concrete | |
| Kevern et al. | Evaluation of resistivity meters for concrete quality assurance. | |
| CA2045353C (en) | Method and apparatus for measuring quantity of admixture in ready-mixed concrete | |
| Miller | Using a centrifuge for quality control of pre-wetted lightweight aggregate in internally cured concrete | |
| CN216209167U (en) | Detection device for concrete | |
| TREMFES et al. | WASHINGTON IMETHOD OF DETERMINING AIR IN FRESH CONCRETE | |
| JP2006038702A (en) | Unit water quantity measuring calculation method in freshly mixed concrete, and unit water quantity measuring system in freshly mixed concrete | |
| Shindman et al. | Comparative study of plastic property test methods for self-consolidating concrete | |
| Williamson | Methods for determining the water and cement content of fresh concrete | |
| JPS5810205B2 (en) | Inspection method for water-cement ratio of ready-mixed concrete | |
| JP2001116748A (en) | Method for measurement of water content per unit volume freshly mixed concrete by using apparatus for measuring salt content | |
| Saouma et al. | AAR Expansion; Effect of Reinforcement, Specimen Type, and Temperature |