CS216898B1 - Binder / filler mixture for the production of protective concrete, especially for shielding neutron radiation - Google Patents
Binder / filler mixture for the production of protective concrete, especially for shielding neutron radiation Download PDFInfo
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- CS216898B1 CS216898B1 CS111681A CS111681A CS216898B1 CS 216898 B1 CS216898 B1 CS 216898B1 CS 111681 A CS111681 A CS 111681A CS 111681 A CS111681 A CS 111681A CS 216898 B1 CS216898 B1 CS 216898B1
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Abstract
Očelom vynálezu je riešenie vhodného po měru a zloženia zmesi spojiva a , plniva, čím sa dosiahne zvýšenie obsahu chemicky via- zanej vody a tým aj zvýšenie funkčnosti bio- logickej ochrany proti neutronovému žiare- niu. Uvedeného účelu sa dosiahne znížením počtu frakcií plniva, pričom tieto frakcie sú v nasledovnom vztahu: plnivo je zložené najviac z dvoch jemných frakcií na seba plynule nadvazujúcich a jednej hruběj frak cie plynule nenadvazujúcej na jemné frak cie. Najvačšie zrno hruběj frakcie nepřesa huje 2,8-násobok najmenšieho zrna tejto frakcie a maximálně zrno jemných frakcií je menšie ako 1/7 priemerného zrna hruběj frakcie.The purpose of the invention is to find a suitable ratio and composition of the mixture of binder and filler, thereby achieving an increase in the content of chemically bound water and thus increasing the functionality of biological protection against neutron radiation. The stated purpose is achieved by reducing the number of filler fractions, whereby these fractions are in the following relationship: the filler is composed of at most two fine fractions continuously connected to each other and one coarse fraction not continuously connected to the fine fractions. The largest grain of the coarse fraction does not exceed 2.8 times the smallest grain of this fraction and the maximum grain of the fine fractions is less than 1/7 of the average grain of the coarse fraction.
Description
Predmetom vynálezu je zmes spojiva a plniva pre výrobu ochranných betónov, najma k tieneniu neutronového žiarenia, predovšefckým v stavbách jadrovej energetiky.The subject of the invention is a mixture of binder and filler for the production of protective concrete, especially for shielding neutron radiation, especially in nuclear power plants.
V súčasnej světověj technike je problémom velkej důležitosti tienenie neutronového žiarenia, teda zoslabenie intenzity žiarenia pomocou materiálov, ktoré vykazujú vel'kú absorbčnú schopnost pre žiarenie. Pre tienenie neutronového žiarenia na stavbách jadrovej energetiky sa používajú ochranné betony, ktoré si udržia chemicky viazanú vodu takmer bez straty dlhodobo aj pri ich ohriatí na teplotu do 450 °C. Je známa zmes spojiva a plniva vhodná k priprave ochranného betonu, ktorá pozostáva z cementu ako práškového spojiva a drveného kameniva s plynulou křivkou zrnitosti. Kamenivo s obsahom zrn v plynulom slede od najmenšich po najváčšie zrná musí byť zoskupené najmenej z troch frakcií drobného a dvoch frakci! hrubého kameniva. Nevýhodou takéhoto kameniva je, že na jeho skladovanie třeba najmenej pat zásobných sil. Ďalšou nevýhodou je, že beton vyrobený z takéhoto kameniva vykazuje značné rozdiely v množstve chemicky viazanej vody už s ohíadom na triediaci proces a získané vlastnosti frakcií.In the current world technology, the problem of shielding neutron radiation, i.e. weakening the intensity of radiation using materials that have a high absorption capacity for radiation, is of great importance. For shielding neutron radiation in nuclear power plants, protective concretes are used, which retain chemically bound water almost without loss for a long time even when heated to a temperature of up to 450 °C. A mixture of binder and filler suitable for the preparation of protective concrete is known, which consists of cement as a powder binder and crushed aggregate with a continuous grain size curve. Aggregate with a grain content in a continuous sequence from the smallest to the largest grains must be grouped from at least three fractions of fine and two fractions of coarse aggregate. The disadvantage of such aggregate is that at least five storage silos are needed for its storage. Another disadvantage is that concrete made from such aggregates shows significant differences in the amount of chemically bound water, depending on the sorting process and the obtained properties of the fractions.
Vyššie uvedené nedostatky odstraňuje zmes spojiva a plniva podfa vynálezu, ktorého podstata spočívá v tom, že pozostáva z 18—20 % himotnostných cementu na báze portlandského slinku a z 80—82 % hmotnostných plniva z prírodného nerastu s chemicky viazanou vodou, zloženého najviac z dvoch jemných frakcií plynule na seba nadvázujúcich a jednej hruběj frakcie plynule nenadvázujúcej na jemné frakcie, pričom najváčšie zrno hruběj frakcie nepřesahuje 2,8-násobok najmenšieho zrna ' tejto frakcie a maximálně zrno jemných frakcií je menšie ako 1/7 priemerného zrna hruběj frakcie.The above-mentioned shortcomings are eliminated by the binder and filler mixture according to the invention, the essence of which is that it consists of 18-20% by weight of Portland clinker-based cement and 80-82% by weight of natural mineral filler with chemically bound water, composed of at most two fine fractions continuously overlapping each other and one coarse fraction not continuously overlapping the fine fractions, with the largest grain of the coarse fraction not exceeding 2.8 times the smallest grain of this fraction and the maximum grain of the fine fractions being less than 1/7 of the average grain of the coarse fraction.
Použitím zmesi spojiva a plniva podl’a vynálezu sa dosiahne vyšší obsah chemicky viazanej vody v ochrannom betone a tým sa zvýši aj jeho funkcia biologickej ochrany proti neutrónovému žiareniu. Použitím najviac troch frakcií plniva namiesto piaticli sa zjednoduší přeprava a skladovanie týchto frakcií a tiež výroba ochranných betónov v podobenkách betonární stavebného podniku. Zníženlm počtu frakcií plniva sa dalej dosiahne zníženie spotřeby vibračnej energie a zníženie pracnosti výroby betonu.By using the binder and filler mixture according to the invention, a higher content of chemically bound water in the protective concrete is achieved, and thus its biological protection function against neutron radiation is also increased. By using a maximum of three filler fractions instead of five, the transport and storage of these fractions is simplified, as well as the production of protective concrete in concrete batching plants of a construction company. By reducing the number of filler fractions, a reduction in vibration energy consumption and a reduction in the laboriousness of concrete production are further achieved.
Přednosti zmesi podfa vynálezu sú zřejmé aj z nasledovných príkladov, ktoré objasňuji! podstatu vynálezu:The advantages of the mixture according to the invention are also apparent from the following examples, which illustrate the essence of the invention:
Příklad 1 na 1 m3 ochranného betonu sa dávkuje: cement 370 kg voda-Pplastifikačné přísady 210 kg serpentinitová drva 0/1 mm 390 kg serpentinitová drva 4/11 mm 1270 kgExample 1 per 1 m 3 of protective concrete is dosed: cement 370 kg water-Plasticizing additives 210 kg serpentinite wood 0/1 mm 390 kg serpentinite wood 4/11 mm 1270 kg
2240 kg2240 kg
Uvedená betonová zmes má nasledujúce vlastnosti:The concrete mixture has the following properties:
chemicky viazaná voda po 28 dňoch tvrdnutia a po vysušení do 500 °C na 1 m3 betonu min. 185 (kg)chemically bound water after 28 days of hardening and after drying to 500 °C per 1 m 3 of concrete min. 185 (kg)
VeBe 6—10 (s) sadnutie normovaného kužela 0—2 (cm) pevnost v tlaku po 28 dňoch 10—15 (MPa)VeBe 6—10 (s) settlement of standard cone 0—2 (cm) compressive strength after 28 days 10—15 (MPa)
Příklad 2Example 2
Uvedená betonová zmes má nasledujúce vlastnosti:The concrete mixture has the following properties:
chemicky viazaná voda po 28 dňoch tvrdnutia a po vysušení do 500 °C na 1 m3 betonu min. 185 (kg)chemically bound water after 28 days of hardening and after drying to 500 °C per 1 m 3 of concrete min. 185 (kg)
VeBe 6—10 (s) sadnutie normového kužela 0—2 (cm) pevnost v tlaku po 28 dňoch 10—15 (MPa)VeBe 6—10 (s) standard cone settlement 0—2 (cm) compressive strength after 28 days 10—15 (MPa)
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS111681A CS216898B1 (en) | 1981-02-17 | 1981-02-17 | Binder / filler mixture for the production of protective concrete, especially for shielding neutron radiation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS111681A CS216898B1 (en) | 1981-02-17 | 1981-02-17 | Binder / filler mixture for the production of protective concrete, especially for shielding neutron radiation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS216898B1 true CS216898B1 (en) | 1982-11-26 |
Family
ID=5344710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS111681A CS216898B1 (en) | 1981-02-17 | 1981-02-17 | Binder / filler mixture for the production of protective concrete, especially for shielding neutron radiation |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS216898B1 (en) |
-
1981
- 1981-02-17 CS CS111681A patent/CS216898B1/en unknown
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