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Method for accurately controlling porosity of concrete and application thereof

A technology for concrete and porosity, applied in the field of accurate control of concrete porosity, can solve the problems of difficult quantitative research on the relationship between porosity and concrete, and the influence of external factors, and achieve compact internal structure of pumice concrete, slowing down freeze-thaw damage, density stable effect

Pending Publication Date: 2020-07-28
CHANGCHUN ARCHITECTURE & CIVILENGEERING CO LLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of pores through foaming is greatly affected by external factors, and it is difficult to quantitatively study the relationship between porosity and concrete properties

Method used

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  • Method for accurately controlling porosity of concrete and application thereof
  • Method for accurately controlling porosity of concrete and application thereof
  • Method for accurately controlling porosity of concrete and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Rubber particles: the particle size is 60 mesh; according to the method of GB / T 533-2008 "Determination of the Density of Vulcanized Rubber or Thermoplastic Rubber", the actual density of the rubber particles obtained in the measurement step (1) is denoted as ρ 0 =1.14Mg / m 3 ;according to the formula Calculate the volume V of the added rubber particles, m 3 ; Among them, P is the target porosity, %; m 0 is the mass of rubber particles, kg;

[0040] Cement: sand: pumice: water: water reducing agent = 450: 750: 570: 180: 3.15, unit: kg / m 3 .

[0041] (1) Replace the total porosity of concrete with the target porosity P, and first calculate the volume V of the added rubber particles, m 3 ;

[0042] (2) Prepare the rubber particle-doped pumice concrete embryo body by doping the pumice concrete matrix with rubber particles; when doping, take the ground rubber particles and mix them with cement, water reducing agent and water first, and then mix them with pumice and sa...

Embodiment 2

[0048] Rubber particle: particle diameter is 50 orders; Unfinished matter, with embodiment 1;

[0049] Cement: sand: pumice: water: water reducing agent = 400: 780: 590: 180: 2.8, unit: kg / m 3 .

[0050] (1) Replace the total porosity of concrete with the target porosity P, and first calculate the volume V of the added rubber particles, m 3 ;

[0051] (2) Prepare the rubber particle-doped pumice concrete embryo body by doping the pumice concrete matrix with rubber particles; when doping, take the ground rubber particles and mix them with cement, water reducing agent and water first, and then mix them with pumice and sand Pour it into a mixer and stir evenly, then place it on a vibrating table for vibration and compaction, and remove the mold after at least 24 hours; the mixer is a forced concrete mixer.

[0052] The rubber particle-doped pumice concrete matrix is ​​that the rubber particle mass is mixed with 3%, 6% and 9% of the cement mass, and the volume of the rubber par...

Embodiment 3

[0057] Rubber particle: particle diameter is 200 orders; Unfinished matter, with embodiment 1;

[0058] Cement: sand: pumice: water: water reducing agent = 430: 770: 580: 180: 3, unit: kg / m 3 .

[0059] (1) Replace the total porosity of concrete with the target porosity P, and first calculate the volume V of the added rubber particles, m 3 ;

[0060] (2) Prepare the rubber particle-doped pumice concrete embryo body by doping the pumice concrete matrix with rubber particles; when doping, take the ground rubber particles and mix them with cement, water reducing agent and water first, and then mix them with pumice and sand Pour it into a mixer and stir evenly, then place it on a vibrating table for vibration and compaction, and remove the mold after at least 24 hours; the mixer is a forced concrete mixer.

[0061] The rubber particle-doped pumice concrete matrix is ​​that the rubber particle mass is mixed with 3%, 6% and 9% of the cement mass, and the volume of the rubber part...

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Abstract

The invention belongs to the technical field of building materials. The invention relates to the technical field of concrete preparation, in particular to a method for accurately controlling concreteporosity and an application of the method in pumice concrete preparation in cold regions. The method specifically comprises the steps that rubber particles approximately serve as pores in concrete, anatural pumice concrete strength empirical formula based on target porosity is established, the target porosity can be equivalent to the total porosity in concrete, the volume of the rubber particlesrequired to be doped is calculated according to the required target porosity, the mass loss rate and the dynamic elastic modulus of the concrete are analyzed to obtain that the rubber particles slow down the freeze-thaw damage of the natural pumice concrete. CT image scanning analysis of the concrete shows that the pumice concrete prepared by the method is more compact in an internal structure, and the durability of the concrete is also improved on the premise of ensuring the strength. The method is suitable for northeast, northwest and other severe cold areas.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for accurately controlling the porosity of concrete and its application in the preparation of pumice concrete in cold regions. Background technique [0002] The frost resistance of concrete is an important index to evaluate the durability of concrete. Cold regions such as Northeast my country, North China and Northwest China have higher requirements for concrete frost resistance. The influence of various factors on the freeze-thaw damage of concrete is the basis for studying the frost resistance of concrete, among which the change of porosity has a significant impact. However, it is difficult to measure the porosity of concrete. [0003] To directly measure the porosity of concrete, the specimen is pretreated by slicing, crushing, soaking, etc., and then the local porosity of the specimen is measured to characterize the overall porosity of the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B28/00C04B111/40
CPCC04B28/00C04B2111/00198C04B2111/40C04B18/22C04B14/16C04B14/06C04B2103/302C04B38/0074
Inventor 白岩尹新生赵传海
Owner CHANGCHUN ARCHITECTURE & CIVILENGEERING CO LLEGE
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