JP2001201502A - Measuring device and measuring method for measuring water absorption rate of aggregate - Google Patents
Measuring device and measuring method for measuring water absorption rate of aggregateInfo
- Publication number
- JP2001201502A JP2001201502A JP2000013204A JP2000013204A JP2001201502A JP 2001201502 A JP2001201502 A JP 2001201502A JP 2000013204 A JP2000013204 A JP 2000013204A JP 2000013204 A JP2000013204 A JP 2000013204A JP 2001201502 A JP2001201502 A JP 2001201502A
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- JP
- Japan
- Prior art keywords
- aggregate
- measuring
- water absorption
- mass
- water
- Prior art date
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Classifications
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、骨材の吸水率の測
定に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the measurement of water absorption of aggregate.
【０００２】[0002]
【従来の技術】従来、コンクリートの吸水率の測定は、
ＪＩＳ−Ａ−１１１０試験方法があり、これは、骨材を
飽水状態にさせるため、２０℃の室温で約２４時間水に
浸し、吸水させる。次に、骨材表面の水膜をぬぐい取
り、この時点の質量（ａｇ）を測定する。次に、この骨
材を１００℃の乾燥炉内で定質量となるまで乾燥し、室
温まで冷却し、その質量（ｂｇ）を測る。2. Description of the Related Art Conventionally, the measurement of the water absorption rate of concrete
There is a JIS-A-1110 test method, in which the aggregate is immersed in water at room temperature of 20 ° C. for about 24 hours to absorb the water in order to make the aggregate saturated. Next, the water film on the surface of the aggregate is wiped off, and the mass (ag) at this time is measured. Next, this aggregate is dried in a drying oven at 100 ° C. until it has a constant mass, cooled to room temperature, and its mass (bg) is measured.
【０００３】吸水率（Ｑ）は、上記で測定した吸水状態
の質量（ａｇ）と乾燥状態の質量（ｂｇ）を用いて、式
Ｑ＝（ａ−ｂ）／ｂ×１００（％）から求める。The water absorption (Q) is obtained from the equation Q = (ab) / b × 100 (%) using the mass (ag) in the water absorption state and the mass (bg) in the dry state measured above. .
【０００４】しかし、近年重要視されている、再生骨
材、低品質天然骨材は、一般に吸水率が通常の骨材と比
較して大きい。このような骨材を、自然吸水による従来
の試験方法に基づいて吸水させた場合、骨材の吸水曲線
は、図３のようになった。即ち、２４時間程度（ＪＩＳ
試験法で得られた吸水率）では吸水が完了せず、ほぼ完
全に吸水を完了するには、約１週間（１６８時間）以上
を要した。更に、骨材を定質量になるまで乾燥させるに
は、約２日程度は最低必要となる。このような多孔質骨
材を、ＪＩＳの方法に準じて試験した場合、約１０日程
度を要することになる。[0004] However, recycled aggregates and low-quality natural aggregates, which have been regarded as important in recent years, generally have a higher water absorption than ordinary aggregates. When water was absorbed into such an aggregate based on a conventional test method using natural water absorption, the water absorption curve of the aggregate was as shown in FIG. That is, about 24 hours (JIS
At the water absorption rate obtained by the test method, water absorption was not completed, and it took about one week (168 hours) or more to complete water absorption almost completely. Further, it takes at least about two days to dry the aggregate to a constant mass. When such a porous aggregate is tested according to the JIS method, it takes about 10 days.
【０００５】一方、再生骨材などは、解体ガラなどより
製造されるため、一般に一ロッドから製造される量が、
天然骨材と比較して極端に少なく、しかも、吸水率など
特性がロッド毎に雑多になっている。そのため、吸水率
の測定回数を多くする必要があり、しかも、測定時間を
短時間に行う必要がある。もし、従来の自然吸水によっ
て再生骨材の品質管理を実施すると、結果が出る頃に
は、既に再生コンクリートとして施工に供されてしまう
危険が生じる。On the other hand, recycled aggregates and the like are manufactured from dismantled scraps and the like.
Compared with natural aggregate, the amount is extremely small, and the characteristics such as the water absorption rate are various for each rod. Therefore, it is necessary to increase the number of times of measurement of the water absorption rate, and it is necessary to shorten the measurement time. If the quality control of the recycled aggregate is performed by the conventional natural water absorption, there is a danger that the recycled aggregate will be already used for the construction by the time the result is obtained.
【０００６】なお、再生骨材の利用については、本出願
人が特願平１０−３３９４７２号、特願平１１−１１５
４５５号として出願している。[0006] Regarding the use of recycled aggregate, the present applicant has filed Japanese Patent Application Nos. 10-339472 and 11-115.
No. 455.
【０００７】[0007]
【発明が解決しようとする課題】＜イ＞本発明は、骨材
の吸水率を迅速に測定することにある。 ＜ロ＞また、本発明は、多孔質の骨材の吸水率を迅速に
測定することにある。<A> The present invention is to quickly measure the water absorption of an aggregate. <B> Another object of the present invention is to quickly measure the water absorption of a porous aggregate.
【０００８】[0008]
【課題を解決するための手段】（１）本願の第１の発明
は、骨材の乾燥状態の質量と吸水状態の質量から骨材の
吸水率を測定する測定装置において、骨材の質量を測定
する質量測定装置と、骨材を乾燥する乾燥装置と、水中
に骨材を配置し加圧する加圧吸水装置とを備えているこ
とを特徴とする、骨材の吸水率を測定する測定装置であ
る。 （２）本願の第２の発明は、第１の発明の骨材の吸水率
を測定する測定装置において、乾燥装置は、高周波加熱
装置であることを特徴とする、骨材の吸水率を測定する
測定装置である。 （３）本願の第３の発明は、骨材の乾燥状態の質量と吸
水状態の質量から骨材の吸水率を測定する測定方法にお
いて、水中に骨材を配置し加圧し、吸水状態の骨材の質
量を測定し、骨材を乾燥し、乾燥状態の骨材の質量を測
定する、又は、骨材を乾燥し、乾燥状態の骨材の質量を
測定し、水中に骨材を配置し加圧し、吸水状態の骨材の
質量を測定することを特徴とする、骨材の吸水率を測定
する測定方法である。 （４）本願の第４の発明は、第３の発明の骨材の吸水率
を測定する測定方法において、骨材の乾燥は、高周波加
熱で乾燥することを特徴とする、骨材の吸水率を測定す
る測定方法である。 （５）本願の第５の発明は、第３の発明の骨材の吸水率
を測定する測定方法において、骨材を水中に配置する
際、蓄熱した状態の骨材を使用することを特徴とする、
骨材の吸水率を測定する測定方法。、骨材の吸水率を測
定する測定方法である。Means for Solving the Problems (1) The first invention of the present application is a measuring device for measuring the water absorption of the aggregate from the mass of the aggregate in the dry state and the mass of the aggregate in the water absorption state. A measuring device for measuring the water absorption of the aggregate, comprising: a mass measuring device for measuring, a drying device for drying the aggregate, and a pressurized water absorbing device for arranging and pressing the aggregate in water. It is. (2) The second invention of the present application is the measuring device for measuring the water absorption of the aggregate according to the first invention, wherein the drying device is a high-frequency heating device, and the water absorption of the aggregate is measured. Measuring device. (3) The third invention of the present application is directed to a measuring method for measuring the water absorption of the aggregate from the mass of the aggregate in a dry state and the mass of the aggregate in a water-absorbed state. Measure the mass of the aggregate, dry the aggregate, measure the mass of the aggregate in the dry state, or dry the aggregate, measure the mass of the aggregate in the dry state, place the aggregate in water It is a measuring method for measuring the water absorption of the aggregate, which comprises applying pressure and measuring the mass of the aggregate in a water-absorbed state. (4) The fourth invention of the present application is the measuring method for measuring the water absorption of an aggregate according to the third invention, wherein the drying of the aggregate is performed by high-frequency heating. This is a measurement method for measuring. (5) The fifth invention of the present application is the measuring method for measuring the water absorption of the aggregate of the third invention, characterized in that when the aggregate is placed in water, the aggregate in a state of storing heat is used. Do
A measuring method for measuring the water absorption of aggregate. This is a method for measuring the water absorption of the aggregate.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態を説明
する。Embodiments of the present invention will be described below.
【００１０】＜イ＞骨材の吸水率を測定する測定装置 骨材の吸水率を測定する測定装置は、図１に示されてい
るように、骨材を十分に乾燥する乾燥装置、骨材と水を
容器に入れて骨材に十分水を吸収させる加圧吸水装置、
及び、乾燥状態の質量と吸水状態の骨材の質量を測定す
る質量測定装置を備えている。必要に応じて、測定した
乾燥状態の質量と吸水状態の骨材の質量を基にして骨材
の吸水率を算出する計算装置を配置する。<A> Measuring Device for Measuring Water Absorption of Aggregate As shown in FIG. 1, a measuring device for measuring the water absorption of aggregate is a drying device for sufficiently drying the aggregate, Pressurized water absorption device that puts water and water into a container and absorbs water enough to the aggregate,
Further, a mass measuring device for measuring the mass of the dried state and the mass of the aggregate in the water absorbing state is provided. If necessary, a calculation device for calculating the water absorption of the aggregate based on the measured mass in the dry state and the mass of the aggregate in the water-absorbed state is arranged.
【００１１】乾燥装置は、骨材全体に対して速く十分に
乾燥処理をできるものがよく、例えば、加熱装置や高周
波加熱装置が使用できる。また、加圧吸水装置は、水と
骨材を一緒に配置し、水に圧力を付与し、骨材全体に対
して速く十分に吸水させるもので、例えば、アムスラー
を使用し、密閉加圧する。[0011] The drying device is preferably a device capable of quickly and sufficiently drying the entire aggregate, and for example, a heating device or a high-frequency heating device can be used. In addition, the pressurized water absorption device arranges water and aggregate together, applies pressure to the water, and absorbs water quickly and sufficiently to the entire aggregate. For example, an Amsler is used and hermetically pressurized.
【００１２】これら装置を使用することにより、骨材の
中でも、特に再生骨材をはじめとする多孔質骨材に対し
ても、乾燥処理や吸水処理の処理時間を短縮することが
できる。By using these devices, the processing time of the drying treatment and the water absorption treatment can be shortened even for the aggregate, especially for the porous aggregate including recycled aggregate.
【００１３】＜ロ＞吸水率の算出 骨材の吸水率の算出における処理方法の一実施例を図１
に示す。その際の骨材の吸水率の変化を図２に示す。先
ず、吸水率試験に供する試料は、絶乾状態の２３８９．
８ｇの再生骨材を使用する。この骨材を１０日間吸水
し、吸水率は２．４％程度であった。この骨材を使用し
て試験を開始する。<B> Calculation of Water Absorption Rate An embodiment of a processing method for calculating the water absorption rate of the aggregate is shown in FIG.
Shown in FIG. 2 shows the change in the water absorption of the aggregate at that time. First, the sample to be subjected to the water absorption test was 2389.
8 g of recycled aggregate is used. This aggregate absorbed water for 10 days, and the water absorption was about 2.4%. The test is started using this aggregate.
【００１４】先ず、水分を除去するために、骨材を乾燥
装置１で加熱乾燥する。吸水率をほぼ０％にするには、
乾燥装置１として乾燥炉を使用すると１日程度かかり、
電子レンジなどの高周波加熱装置では、６０分程度かか
った。乾燥後、質量測定装置２で質量（Ｂｇ）を測定す
る。First, in order to remove moisture, the aggregate is heated and dried by the drying device 1. To make the water absorption almost 0%,
When a drying oven is used as the drying device 1, it takes about one day,
It took about 60 minutes with a high-frequency heating device such as a microwave oven. After drying, the mass (Bg) is measured by the mass measuring device 2.
【００１５】次に、加圧可能な容器５に水を張り、乾燥
した骨材を投入する。骨材は蓄熱しているので、水中に
投入して冷却することにより熱間吸水する。これによ
り、骨材は、急激に水を吸収し、吸水率が１．５％程度
になった。Next, water is filled in the pressurizable container 5, and dried aggregate is introduced. Since the aggregate stores heat, it is hot-absorbed by being put into water and cooled. As a result, the aggregate rapidly absorbed water, and the water absorption became about 1.5%.
【００１６】しかし、完全に吸水するには、更に加圧し
て、骨材内部への水の圧入を行う。圧入によって６０分
程度で十分に吸水し、吸水率が２．４％程度になった。
加圧する圧力は、吸水率が向上する圧力なら良く、例え
ば３ＭＰａ〜５ＭＰａが好ましかった。However, in order to completely absorb water, pressurization is further performed to press water into the aggregate. Water was sufficiently absorbed in about 60 minutes by press-fitting, and the water absorption rate became about 2.4%.
The pressure to be applied may be any pressure that improves the water absorption, for example, 3 MPa to 5 MPa is preferable.
【００１７】十分に吸水後、骨材を容器５より取り出
し、骨材表面の水膜を拭い、質量測定装置２で質量（Ａ
ｇ）を測定した 吸水率（Ｑ）は、式Ｑ＝（Ａ−Ｂ）／Ｂ×１００（％）
により求められる。この処理の所要時間は、乾燥炉を用
いても１日〜２日程度であり、高周波加熱装置を使用す
ると１２０分程度であった。After sufficient water absorption, the aggregate is taken out of the container 5, the water film on the surface of the aggregate is wiped, and the mass (A) is measured by the mass measuring device 2.
g) was measured, and the water absorption (Q) was calculated by the formula Q = (A−B) / B × 100 (%)
Required by The time required for this treatment was about 1 to 2 days even when a drying furnace was used, and about 120 minutes when a high-frequency heating device was used.
【００１８】[0018]
【発明の効果】本発明は、次のような効果を得ることが
できる。 ＜イ＞本発明は、骨材、特に多孔質骨材の吸水率を迅速
に測定することができる。 ＜ロ＞また、本発明は、今後、急速に進む再生骨材や天
然低品質骨材などの多孔質骨材の品質管理を容易に行う
ことができる。 ＜ハ＞また、本発明は、圧力吸水を基本原理にしている
ため、ポンプ圧送などによるコンクリートのスランプロ
スをコントロールできる。 ＜ニ＞また、本発明は、減圧工法製造コンクリートの練
り上がり状態の品質管理に利用できる。According to the present invention, the following effects can be obtained. <A> The present invention can rapidly measure the water absorption of an aggregate, particularly a porous aggregate. <B> In addition, the present invention can easily perform quality control of porous aggregates such as recycled aggregates and natural low-quality aggregates, which are rapidly progressing in the future. <C> In addition, since the present invention uses pressure absorption as a basic principle, it is possible to control slump loss of concrete by pumping or the like. <D> Further, the present invention can be used for quality control in a kneaded state of concrete manufactured by a reduced pressure method.
【図１】吸水率の測定図FIG. 1 Measurement diagram of water absorption
【図２】吸水率測定経過における骨材の吸水率の変化を
示す図FIG. 2 is a diagram showing a change in water absorption of an aggregate in the course of water absorption measurement.
【図３】従来の吸水方法による骨材の吸水率の変化を示
す図FIG. 3 is a diagram showing a change in water absorption of an aggregate by a conventional water absorption method.
１・・・乾燥装置 ２・・・質量測定装置 ３・・・加圧吸水装置 ４・・・計算装置 ５・・・容器 DESCRIPTION OF SYMBOLS 1 ... Drying device 2 ... Mass measuring device 3 ... Pressurized water absorption device 4 ... Calculation device 5 ... Container
Claims (5)
ら骨材の吸水率を測定する測定装置において、 骨材の質量を測定する質量測定装置と、 骨材を乾燥する乾燥装置と、 水中に骨材を配置し加圧する加圧吸水装置とを備えてい
ることを特徴とする、骨材の吸水率を測定する測定装
置。1. A measuring device for measuring the water absorption of an aggregate from the mass of the aggregate in a dry state and the mass of a water absorption state, comprising: a mass measuring device for measuring the mass of the aggregate; and a drying device for drying the aggregate. A pressure measuring device for measuring the water absorption of the aggregate, comprising: a pressurized water absorbing device for arranging and pressing the aggregate in water.
測定装置において、 乾燥装置は、高周波加熱装置であることを特徴とする、
骨材の吸水率を測定する測定装置。2. The measuring device for measuring the water absorption of aggregate according to claim 1, wherein the drying device is a high-frequency heating device.
A measuring device that measures the water absorption of aggregate.
ら骨材の吸水率を測定する測定方法において、 水中に骨材を配置し加圧し、吸水状態の骨材の質量を測
定し、骨材を乾燥し、乾燥状態の骨材の質量を測定す
る、又は、骨材を乾燥し、乾燥状態の骨材の質量を測定
し、水中に骨材を配置し加圧し、吸水状態の骨材の質量
を測定することを特徴とする、骨材の吸水率を測定する
測定方法。3. A method of measuring the water absorption of an aggregate from the mass of the aggregate in a dry state and the mass of a water absorption state, wherein the aggregate is placed in water, pressurized, and the mass of the aggregate in the water absorption state is measured. Dry the aggregate, measure the mass of the dried aggregate, or dry the aggregate, measure the mass of the dried aggregate, place the aggregate in water, pressurize, and A method for measuring the water absorption of an aggregate, comprising measuring the mass of the aggregate.
測定方法において、 骨材の乾燥は、高周波加熱で乾燥することを特徴とす
る、骨材の吸水率を測定する測定方法。4. The method for measuring the water absorption of an aggregate according to claim 3, wherein the drying of the aggregate is performed by high-frequency heating. .
測定方法において、 骨材を水中に配置する際、蓄熱した状態の骨材を使用す
ることを特徴とする、骨材の吸水率を測定する測定方
法。5. The method for measuring the water absorption of an aggregate according to claim 3, wherein when the aggregate is placed in water, the aggregate in a state of storing heat is used. A measuring method for measuring water absorption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000013204A JP3458136B2 (en) | 2000-01-21 | 2000-01-21 | Measuring device and measuring method for measuring water absorption of aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000013204A JP3458136B2 (en) | 2000-01-21 | 2000-01-21 | Measuring device and measuring method for measuring water absorption of aggregate |
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| Publication Number | Publication Date |
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| JP3458136B2 JP3458136B2 (en) | 2003-10-20 |
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