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A kind of low background value concrete and preparation method thereof

A concrete and low-background technology, applied in the field of low-background concrete and its preparation, can solve the problems of difficulty in guaranteeing concrete strength, inaccurate detection of slump, serious bleeding, etc., so as to prevent shrinkage cracking and reduce air absorption. The dose rate, the effect of reducing the concentrated release of heat of hydration

Active Publication Date: 2020-09-25
CHINA CONSTR FIRST BUILDING GRP CORP LTD +1
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Problems solved by technology

[0003] The present invention proposes a low background value concrete and its preparation method, to solve the problems of traditional low background value concrete such as poor pumpability, serious bleeding, inability to accurately detect slump, difficulty in guaranteeing concrete strength and appearance of formed concrete members. There are many technical problems of quality defects such as honeycomb, pockmarked surface and cracks

Method used

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  • A kind of low background value concrete and preparation method thereof
  • A kind of low background value concrete and preparation method thereof
  • A kind of low background value concrete and preparation method thereof

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preparation example Construction

[0053] Such as figure 1 As shown, the specific steps of the preparation method of this low background value concrete are as follows.

[0054] Step 1: Calculate the mass of each component according to the total mass of the prepared concrete.

[0055] Step two, according to the calculated amount, put quartz stone, cement and quartz sand into the concrete mixer in sequence; the concrete mixing and feeding order mentioned here is a reasonable order required by the specification, and it can ensure that the stones, cement, etc. are mixed evenly. Prevent cement from entering the mixer together with other coarse and fine aggregates. Small cement aggregates will be formed soon after encountering water. The smaller the water-cement ratio, the more serious the agglomeration.

[0056] Step 3: Stirring is performed. After the stirring is uniform, half of the calculated total mass of water is added to the mixture in Step 2.

[0057] Step four: prepare a water-reducing agent solution, the ratio of w...

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Abstract

The invention relates to a low-background value concrete and a preparation method thereof. The low-background value concrete is prepared from the following components in parts by weight: 399kg to 434kg of cement; 139kg to 140kg of water; 806kg to 863kg of fine aggregate; 973kg to 985kg of coarse aggregate; and 10.6kg to 11.5kg of water reducing agent. The invention solves the technical problems ofconventional low-background value concrete, such as poor pumpability, severe bleeding, incapability of accurately detecting slump, difficulty to ensure concrete strength and a lot of quality defectson surfaces of formed concrete members, such as honeycombs, pitted surfaces and cracks.

Description

Technical field [0001] The invention belongs to the technical field of concrete preparation, and particularly relates to a low background value concrete and a preparation method thereof. Background technique [0002] In the construction of laboratories for scientific research testing that have sensitive requirements for background values, the requirements for the background values ​​of various raw materials are very high. The low background value concrete uses low-radiation quartz stone, quartz sand, and low water. Chemical heat Portland cement is blended with polycarboxylic acid inorganic composite water reducer through gradation to prepare concrete with low heat of hydration, low radiation and low background value. The radionuclide K-40 in its main material , Ra-226 and Th-232 are relatively low, effectively shielding the influence of cosmic rays and its own radioactive elements on the measurement results of the low-background spectrometer. The air absorbed dose rate of natura...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2103/302C04B14/06
Inventor 李松伟丁益民李运闯杜小乐于辉陆东王安陈鹏洲李晋谦鞠竹朱佳乐苏岩程春驰吴晗于国鑫郑向阳
Owner CHINA CONSTR FIRST BUILDING GRP CORP LTD
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