JPH0114539B2 - - Google Patents
Info
- Publication number
- JPH0114539B2 JPH0114539B2 JP16582483A JP16582483A JPH0114539B2 JP H0114539 B2 JPH0114539 B2 JP H0114539B2 JP 16582483 A JP16582483 A JP 16582483A JP 16582483 A JP16582483 A JP 16582483A JP H0114539 B2 JPH0114539 B2 JP H0114539B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- mass concrete
- water tank
- simulated
- specimen
- 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
- 239000004567 concrete Substances 0.000 claims description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims 2
- 238000011161 development Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 3
- 238000009415 formwork Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Ceramic Engineering (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Description
この発明は、マスコンクリート供試体の管理方
法および装置に関するものである。
マスコンクリート構造体は、一般のコンクリー
ト構造体に比べてコンクリートがかなり高温とな
る。これに伴つて、若材令時の強度発現も著しく
大きくなることが予想され、その状態を施工者が
適切に管理、把握することは、型枠存置期間の大
幅な短縮やコンクリートの温度による補正値の低
減、撤廃などを可能として、施工者にとつての大
きなメリツトを生むことになる。
ところが、現状では、マスコンクリート構造体
の強度管理を適切に進めるための簡易な技術は確
立しておらず、各研究者、技術者が個別に対応を
図り、種々の検討、工夫を凝らしながら施工を進
めている状態であり、常に困難やトラブルを発生
する危険性がつきまとつている。こうした問題を
解決するため、過去には、マスコンクリート構造
体の強度発現状態を把握する方法として理論的、
解析的な技術を利用する試みがいくつか行なわれ
ている。しかし、非定常な温度履歴を受ける若材
令コンクリートの物性には不明な点が多く、こう
した立場から的確で簡易な手法を求めることはき
わめて困難であつた。
そこで、本発明者らは、マスコンクリートの強
度発現が一般のコンクリートと大きく相違する原
因が、若材令時に非定常な高温状態を履歴する点
にあることから、マスコンクリート構造体が履歴
する温度条件を強度管理用の供試体にそのまま与
えることにより、一般のコンクリート構造体の場
合と同様に、供試体強度の管理によつてかなり的
確に構造体強度の管理が行なえることを見い出し
た。
この発明は、上記のような知見に基づいてなさ
れたものであり、マスコンクリート構造体と同一
の温度条件を強度管理用の供試体に与えることに
より、その供試体からマスコンクリート構造体の
強度発現状態を的確に把握することができるマス
コンクリート供試体の管理方法および装置を提供
するものである。
以下、この発明を図面に基づいて説明する。
まず、装置について説明すると、第１図中１は
水槽であつて、その水中にはマスコンクリートの
供試体Ｓが収められている。また、この水槽１内
には加熱ユニツト（例えば電気ヒーターとフアン
を組み合わせたもの）２が備えられていて、これ
は制御ボツクス３における温度制御器４によつて
制御される。温度制御器４には温度検出器として
熱電対（例えばＣ−Ｃ熱電対）５が接続されてい
て、それは実際に施工される実施工マスコンクリ
ートの適所P1、またはその実施工マスコンクリ
ートに模した模擬マスコンクリートの適所P2に
取付けられて、その取付箇所の履歴温度を検出す
る。そして、温度制御器４は、熱電対５の検出温
度に水槽１の水温を合わせるように加熱ユニツト
２を制御する。そのため、その温度制御器４に
は、水槽１の水温を検出してフイードバツクする
熱電対（例えばＣ−Ｃ熱電対）６が接続されてい
る。この温度制御器４による温度制御の状況は温
度表示器７にて表示される。
このように、本装置によれば、実施工マスコン
クリート、または模擬マスコンクリートの履歴温
度に合わせて水槽１の温度が制御され、供試体Ｓ
に対してマスコンクリートの履歴温度が与えられ
る。
次に、模擬マスコンクリートの履歴温度に合わ
せて水槽１を温度制御する場合の例について説明
する。
模擬マスコンクリートは、第３図および第４図
に示すような４面断熱槽８内に打設される。これ
は、第２図ａ，ｂに示すようにマスコンクリート
部材からその最小部材厚方向の棒状コンクリート
C1を取り出した状態を想定することに基づく。
すなわち、その棒状コンクリートC1の両端面を
除く周囲４面に完全な断熱状態を与えることによ
つて、マスコンクリート部材の最小部材厚方向の
水和による発熱、熱伝導、熱伝達挙動をシミユレ
ツトし、そして一次元の温度経過や温度分布状態
の予測値を入手しようとするものである。そのた
め、断熱槽８の周囲４面の鋼板型枠９の内側に
は、ガラス綿保温板１０、熱伝導板と組み合わさ
れた制御用ヒーター１１、F.R.P１２が備えられ
ていて、そのガラス綿保温板１０によつて外部へ
の放熱を防ぎ、またそこから逃げる熱量をヒータ
ー１１によつて与えることにより、完全な断熱状
態をつくるようになつている。
こうした断熱槽８内に打設される模擬マスコン
クリートC2内には、その長手方向に沿つて所定
の間隔で複数の熱電対１３がセツトされ、そして
それらは制御盤１４における自記温度記録計１
５、および温度制御器１６に接続されている。こ
の温度制御器１６は熱電対１３の検出温度に基づ
いてヒーター１１を適正に制御する。
そして、この模擬マスコンクリートC2の基準
点温度が前述した第１図の温度制御器４に電気信
号として入力される。この基準点温度は、例えば
模擬マスコンクリートC2のその長手方向中間の
内部の温度、あるいはその表面温度などであつ
て、マスコンクリートの種類などに応じた適所の
温度とする。
次に、実験結果を掲げる。
ここでは、最小部材寸法が1600mmの壁状マスコ
ンクリートを想定して、単位セメント量Ｃが300
Kg／m3と400Kg／m3の模擬マスコンクリートC2を
用いて実験を行なつた。これら模擬マスコンクリ
ートC2は下表のように調合した。表中上欄のCA
は単位セメント量Ｃが300Kg／m3のもの、下欄の
CBはそれが400Kg／m3のものである。
The present invention relates to a method and apparatus for managing mass concrete specimens. In mass concrete structures, the concrete becomes considerably hotter than in general concrete structures. Along with this, it is expected that the strength development of young materials will significantly increase, and it is important for constructors to properly manage and understand this condition, which will significantly shorten the formwork retention period and make corrections based on concrete temperature. By making it possible to reduce or eliminate costs, this will bring great benefits to the constructor. However, at present, no simple technology has been established to appropriately manage the strength of mass concrete structures, and each researcher and engineer has to deal with it individually and carry out various studies and ingenuity. We are currently in a state of progress, and there is always the risk of difficulties and troubles occurring. In order to solve these problems, in the past, theoretical methods were used to understand the strength development state of mass concrete structures.
Several attempts have been made to utilize analytical techniques. However, there are many unknowns about the physical properties of young concrete that undergoes an unsteady temperature history, and it has been extremely difficult to find an accurate and simple method from this perspective. Therefore, the present inventors found that the reason why the strength development of mass concrete is significantly different from that of ordinary concrete is that it experiences unsteady high temperature conditions during the young age. It has been found that by applying the same conditions to the specimen for strength control, the strength of the structure can be managed quite accurately by controlling the strength of the specimen, as in the case of general concrete structures. This invention was made based on the above knowledge, and by applying the same temperature conditions as the mass concrete structure to the strength control specimen, it is possible to evaluate the strength of the mass concrete structure from the specimen. The purpose of the present invention is to provide a method and apparatus for managing mass concrete specimens that can accurately grasp the condition. The present invention will be explained below based on the drawings. First, to explain the apparatus, numeral 1 in FIG. 1 is a water tank in which a mass concrete specimen S is placed. Also provided within the water tank 1 is a heating unit 2 (for example, a combination of an electric heater and a fan), which is controlled by a temperature controller 4 in a control box 3. A thermocouple (for example, a C-C thermocouple) 5 is connected to the temperature controller 4 as a temperature detector, and it is connected to a thermocouple (for example, a C-C thermocouple) 5 at a suitable position P 1 of the mass concrete to be actually constructed, or a thermocouple imitating the mass concrete to be constructed. It is installed at the appropriate location P2 of the simulated mass concrete and detects the historical temperature at the installation location. The temperature controller 4 then controls the heating unit 2 so that the water temperature in the water tank 1 matches the temperature detected by the thermocouple 5. Therefore, a thermocouple (for example, a C-C thermocouple) 6 is connected to the temperature controller 4 to detect the water temperature of the water tank 1 and provide feedback. The status of temperature control by the temperature controller 4 is displayed on the temperature display 7. In this way, according to this device, the temperature of the water tank 1 is controlled according to the historical temperature of the actual mass concrete or the simulated mass concrete, and the temperature of the water tank 1 is
The hysteretic temperature of mass concrete is given for . Next, an example will be described in which the temperature of the water tank 1 is controlled in accordance with the historical temperature of the simulated mass concrete. The simulated mass concrete is poured into a four-sided heat-insulating tank 8 as shown in FIGS. 3 and 4. As shown in Figure 2 a and b, the rod-shaped concrete is removed from the mass concrete member in the direction of its minimum thickness.
Based on assuming the state where C 1 is taken out.
In other words, by providing complete insulation to the four surrounding surfaces of the bar-shaped concrete C1 , excluding both end surfaces, we simulate the heat generation, heat conduction, and heat transfer behavior due to hydration in the direction of the minimum member thickness of the mass concrete member. , and attempts to obtain predicted values of the one-dimensional temperature course and temperature distribution state. Therefore, inside the steel plate formwork 9 on four sides around the heat insulating tank 8, a glass cotton heat insulating plate 10, a control heater 11 combined with a heat conduction plate, and an FRP 12 are provided. This prevents heat from radiating to the outside, and the heater 11 supplies the amount of heat that escapes from there, thereby creating a complete heat insulation state. A plurality of thermocouples 13 are set at predetermined intervals along the longitudinal direction of the simulated mass concrete C 2 placed in the heat insulating tank 8, and these thermocouples are connected to the self-recording temperature recorder 1 in the control panel 14.
5, and a temperature controller 16. The temperature controller 16 appropriately controls the heater 11 based on the temperature detected by the thermocouple 13. The reference point temperature of this simulated mass concrete C 2 is then input as an electrical signal to the temperature controller 4 shown in FIG. 1 mentioned above. This reference point temperature is, for example, the temperature inside the simulated mass concrete C 2 in the longitudinal direction, or its surface temperature, and is set at an appropriate temperature depending on the type of mass concrete. Next, we present the experimental results. Here, assuming wall mass concrete with a minimum member dimension of 1600 mm, the unit cement amount C is 300 mm.
Experiments were conducted using simulated mass concrete C 2 of Kg/m 3 and 400 Kg/m 3 . These simulated mass concrete C2 were mixed as shown in the table below. C A in the upper column of the table
In the lower column, the unit cement amount C is 300Kg/ m3 .
CB has a weight of 400Kg/ m3 .
【表】
これら両者の模擬マスコンクリートCA，CBに
おける長手方向中間の内部の点の温度、つまりそ
の端面から800mmの中心部の温度の経時変化を第
５図に表わす。なお、同図中T0は外気温（20±
１℃）を示す。また、こうした温度変化に見合う
ように断熱槽８の温度が制御される。第６図に
は、それらの長手方向つまり最小部材厚方向にお
ける内部の温度分布状態を表わす。同図では、縦
軸に模擬マスコンクリートCA，CBの長さをとつ
て、その縦軸の中間を横切る一点鎖線を模擬マス
コンクリートCA，CBの中間を示す線としている。
そして、左側から材令1.5日、３日、７日におけ
る温度分布状態を表わす。
第７図は、第５図に表わした模擬マスコンクリ
ートCBの中心部の温度履歴を、それと同じく単
位セメント量Ｃが400Kg／m3の水槽１内の供試体
Ｓに実際に与えた場合の圧縮強度の発現、分布状
態を示す。同図中右側は、材令が14日と28日の模
擬マスコンクリートCBの内部から採取したコア
供試体の圧縮強度を表わし、そのコア供試体の採
取位置は、模擬マスコンクリートCBの中心から
長手方向の片側半分800mmの部分において、その
両端から58mmの２位置と、その２位置間を114mm
毎に分けた５位置との計７位置である。これに対
し、同図中左側には供試体Ｓの材令に伴なう圧縮
強度の変化を表わし、またこれと共に、白丸でプ
ロツトされた点を結ぶ線によつて、供試体Ｓと同
様のものを標準水中養生法、つまり20℃一定の水
中で養生させた場合のその圧縮強度の変化を表わ
す。
こうした実験結果から、模擬マスコンクリート
CBの中心部の温度履歴を与えた供試体Ｓは、そ
の模擬マスコンクリートCBと同様に圧縮強度が
変化することが確認できた。
ところで、このように模擬マスコンクリートを
利用することによつて最小部材厚方向の温度変化
や温度分布の状態と強度発現状態を把握すること
は、マスコンクリートの調合計画、施工計画を進
める上においてきわめて有益である。
以上説明したように、この発明によればマスコ
ンクリート構造体と同一の温度条件を強度管理用
の供試体に与えることによつて、その供試体から
マスコンクリート構造体の強度発現状態を的確に
把握することができる。[Table] Figure 5 shows the change over time in the temperature at the longitudinally intermediate point in these two simulated mass concretes C A and C B , that is, the temperature at the center 800 mm from the end face. In addition, T 0 in the same figure is the outside temperature (20±
1°C). Furthermore, the temperature of the heat insulating tank 8 is controlled to correspond to such temperature changes. FIG. 6 shows the internal temperature distribution state in the longitudinal direction, that is, the minimum member thickness direction. In the figure, the length of the simulated mass concrete C A and CB is plotted on the vertical axis, and the dashed-dotted line that crosses the middle of the vertical axis is the line that indicates the middle of the simulated mass concrete C A and CB .
From the left, the temperature distribution state at 1.5 days, 3 days, and 7 days of wood age is shown. Figure 7 shows the temperature history at the center of the simulated mass concrete C B shown in Figure 5 when it is actually applied to a specimen S in a water tank 1 with a unit cement amount C of 400 kg/ m3 . It shows the expression and distribution of compressive strength. The right side of the figure shows the compressive strength of the core specimens taken from inside the simulated mass concrete C B at ages 14 and 28 days, and the sampling position of the core specimen is the center of the simulated mass concrete C B. In the 800mm half of one side in the longitudinal direction, two positions 58mm from both ends and 114mm between the two positions.
There are 5 positions divided into 7 positions in total. On the other hand, the left side of the figure shows the change in compressive strength of specimen S as the material ages, and along with this, a line connecting the points plotted with white circles indicates that the same as specimen S It shows the change in compressive strength when something is cured using the standard underwater curing method, that is, in water at a constant temperature of 20℃. Based on these experimental results, simulated mass concrete
It was confirmed that the compressive strength of specimen S, which was given the temperature history of the center of C B , changed in the same way as that of the simulated mass concrete C B. By the way, by using simulated mass concrete in this way, it is extremely important to understand the temperature change in the direction of the minimum member thickness, the state of temperature distribution, and the state of strength development when proceeding with mass concrete mixing plans and construction plans. Beneficial. As explained above, according to the present invention, by applying the same temperature conditions as the mass concrete structure to the strength control specimen, it is possible to accurately understand the strength development state of the mass concrete structure from the specimen. can do.
第１図はこの発明の装置の概略構成図、第２図
ａ、第２図ｂはそれぞれ実施工マスコンクリート
と模擬マスコンクリートの関係を表わす図、第３
図は断熱槽およびその周辺機器の説明図、第４図
は断熱槽の立断面図、第５図乃至第７図はこの発
明の実験結果を示し、第５図は模擬コンクリート
の中心部温度の経時変化曲線図、第６図は模擬マ
スコンクリートの温度分布状態曲線図、第７図は
圧縮強度の発現、分布状態曲図図である。
１……水槽、２……加熱ユニツト、５……熱電
対、８……４面断熱槽、C2……模擬マスコンク
リート、Ｓ……供試体。
Figure 1 is a schematic configuration diagram of the apparatus of the present invention, Figures 2a and 2b are diagrams showing the relationship between actually worked mass concrete and simulated mass concrete, respectively.
Figure 4 is an explanatory diagram of the insulation tank and its peripheral equipment, Figure 4 is an elevation cross-sectional view of the insulation tank, Figures 5 to 7 show the experimental results of this invention, and Figure 5 shows the temperature at the center of the simulated concrete. Fig. 6 is a diagram showing the temperature distribution state of simulated mass concrete, and Fig. 7 is a diagram showing the development and distribution state of compressive strength. 1...water tank, 2...heating unit, 5...thermocouple, 8...4-sided insulation tank, C2 ...simulated mass concrete, S...specimen.
Claims (1)
実際に施工した実施工マスコンクリートまたはそ
れに模した模擬マスコンクリートの履歴温度に合
わせて、前記水槽の温度を制御することを特徴と
するマスコンクリート供試体の管理方法。 ２ マスコンクリートの供試体が入る水槽と、こ
の水槽を加熱する加熱ユニツトと、実際に施工さ
れた実施工マスコンクリートの履歴温度を検出す
る温度検出器と、この温度検出器の検出信号に基
づいて、その検出温度に前記水槽の温度を合わせ
るように前記加熱ユニツトを制御する温度制御器
とを具備して成ることを特徴とするマスコンクリ
ート供試体の管理装置。 ３ マスコンクリートの供試体が入る水槽と、こ
の水槽を加熱する加熱ユニツトと、４面が断熱さ
れて内部に模擬マスコンクリートが打設される断
熱槽と、この断熱槽内の模擬マスコンクリートの
履歴温度を検出する温度検出器と、この温度検出
器の検出信号に基づいて、その検出温度に前記水
槽の温度を合わせるように前記加熱ユニツトを制
御する温度制御器とを具備して成ることを特徴と
するマスコンクリート供試体の管理装置。[Claims] 1. Place a mass concrete specimen in a water tank,
A method for managing a mass concrete specimen, comprising controlling the temperature of the water tank in accordance with the historical temperature of actually constructed mass concrete or a simulated mass concrete imitating it. 2. A water tank containing the mass concrete specimen, a heating unit that heats this water tank, a temperature detector that detects the historical temperature of the mass concrete that was actually constructed, and a temperature sensor that detects the temperature based on the detection signal of this temperature sensor. and a temperature controller that controls the heating unit so that the temperature of the water tank matches the detected temperature. 3. A water tank containing the mass concrete specimen, a heating unit that heats this water tank, an insulated tank with four sides insulated and into which simulated mass concrete is placed, and the history of the simulated mass concrete in this insulated tank. It is characterized by comprising a temperature detector that detects temperature, and a temperature controller that controls the heating unit to match the temperature of the water tank to the detected temperature based on the detection signal of the temperature detector. Management device for mass concrete specimens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16582483A JPS6057252A (en) | 1983-09-08 | 1983-09-08 | Mass concrete specimen management method and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16582483A JPS6057252A (en) | 1983-09-08 | 1983-09-08 | Mass concrete specimen management method and equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6057252A JPS6057252A (en) | 1985-04-03 |
| JPH0114539B2 true JPH0114539B2 (en) | 1989-03-13 |
Family
ID=15819694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16582483A Granted JPS6057252A (en) | 1983-09-08 | 1983-09-08 | Mass concrete specimen management method and equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6057252A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551380A (en) * | 2009-05-01 | 2009-10-07 | 徐州建筑职业技术学院 | Method for estimating concrete strength of thin-walled structure by using small core sample strength |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6327853U (en) * | 1986-08-05 | 1988-02-24 | ||
| JPS63117260A (en) * | 1986-11-04 | 1988-05-21 | Shimizu Constr Co Ltd | Concrete strength control method and control device |
| JP2645320B2 (en) * | 1988-10-28 | 1997-08-25 | 清水建設株式会社 | Concrete strength management device |
| CN102944669A (en) * | 2012-11-15 | 2013-02-27 | 河海大学 | Hydraulic concrete destructive test system |
-
1983
- 1983-09-08 JP JP16582483A patent/JPS6057252A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551380A (en) * | 2009-05-01 | 2009-10-07 | 徐州建筑职业技术学院 | Method for estimating concrete strength of thin-walled structure by using small core sample strength |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6057252A (en) | 1985-04-03 |
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