Phase-change mass concrete and preparation method thereof

A mass concrete and phase change technology, applied in the field of concrete materials, can solve the problems such as the difficulty of precise control of the water passage time and water passage rate, the water pipe layout method, the extension of the construction period by the pre-buried cooling water pipe method, and the influence on the continuity of concrete pouring. The effect of reducing construction cost, reducing construction period and simple process

Active Publication Date: 2021-12-24
CHINA FIRST METALLURGICAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method has the following problems: the material precooling method occupies the storage area, affects the continuity of concrete pouring, and the actual operation is difficult to meet the requirements; the pre-embedded cooling water pipe method pr

Method used

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  • Phase-change mass concrete and preparation method thereof
  • Phase-change mass concrete and preparation method thereof
  • Phase-change mass concrete and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Table 1

[0044]

[0045] The water fine aggregate is machine-made sand and river sand, the blending mass ratio is 1:1, and the fineness modulus is 1.6-3.0; the coarse aggregate is 5-31.5mm continuous graded gravel, and the apparent density 2700~3100kg / m 3 ; The phase change material is a microcapsule phase change material, and the machine-made sand of equal volume is replaced by a volume sand substitution method.

[0046] Pour the cementitious material, fine aggregate, coarse aggregate and phase change material into the concrete mixer according to the proportions in Table 1 and dry mix for 30-60 seconds, then add water reducer and water, and continue mixing for 50-120 seconds to obtain the product based on Phase change concrete made of phase change materials. Its physical performance technical indicators are listed in Table 5.

Embodiment 2

[0048] Table 2

[0049]

[0050]

[0051] The water fine aggregate is machine-made sand and river sand, the blending mass ratio is 1.2:1, the fineness modulus is 1.6-3.0; the coarse aggregate is 5-31.5mm continuous graded crushed stone, the apparent density 2700~3100kg / m 3 ; The phase change material is a microcapsule phase change material, and the machine-made sand of equal volume is replaced by a volume sand substitution method.

[0052] Pour the cementitious material, fine aggregate, coarse aggregate and phase change material into the concrete mixer according to the ratio in Table 2 and dry mix for 30-60 seconds, then add water reducer and water, and continue mixing for 50-120 seconds to obtain the Phase change concrete made of phase change materials. Its physical performance technical indicators are listed in Table 5.

Embodiment 3

[0054] table 3

[0055]

[0056] The water fine aggregate is machine-made sand and river sand, the blending mass ratio is 1.5:1, the fineness modulus is 1.6-3.0; the coarse aggregate is 5-31.5mm continuous graded crushed stone, the apparent density 2700~3100kg / m 3 ; The phase change material is a microcapsule phase change material, and the machine-made sand of equal volume is replaced by a volume sand substitution method.

[0057] Pour the cementitious material, fine aggregate, coarse aggregate and phase change material into the concrete mixer according to the ratio in Table 3 and dry mix for 30-60 seconds, then add water reducer and water, and continue mixing for 50-120 seconds to obtain the Phase change concrete made of phase change materials. Its physical performance technical indicators are listed in Table 5.

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Abstract

The invention discloses phase-change mass concrete which comprises the following components: 140-170kg/m < 3 > of water; 300-400 kg/m < 3 > of cement; 50-150 kg/m < 3 > of coal ash; 650-850 kg/m < 3 > of fine aggregate; 1000-1200 kg/m < 3 > of coarse aggregate; 9.0-13.6 kg/m < 3 > of water reducing agent; 1-5 kg/m < 3 > of a phase change material; the phase-change material is a high-thermal-conductivity nanoscale microcapsule phase-change material, and the phase-change temperature is 49 DEG C; the phase-change mass concrete prepared based on the phase-change material can effectively slow down the internal temperature rise of the mass concrete, reduce the temperature gradient and reduce the probability of temperature cracks of the mass concrete; and compared with a traditional mass concrete cooling method, the construction cost is greatly reduced, the process is simple, the performance is stable, a traditional cooling water pipe cooling method can be replaced, and the construction period is greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and in particular relates to a phase-change large-volume concrete and a preparation method thereof. Background technique [0002] Temperature cracks in concrete structures are one of the persistent problems of civil engineering quality. Cracks not only affect the appearance, but also seriously affect the service life and safety of structures. The temperature cracks in large-volume high-strength grade (above C40) concrete are particularly prominent. The heat of hydration of concrete causes the temperature stress formed inside to cause the concrete structure to crack. For example, the foundations, bridges, and dams of many large buildings have different degrees of temperature cracks. [0003] Phase change material (PCM) is a kind of energy change that uses the energy of the material itself when the material changes and the structure changes within the range of humidity and temperature, r...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B24/36
CPCC04B28/04C04B40/0046C04B2103/0071C04B2201/20C04B2201/50C04B18/08C04B14/06C04B14/068C04B18/12C04B2103/302C04B24/36C04B14/024C04B2103/44C04B2103/608C04B24/123
Inventor 陈四明龚晓斌陈峰
Owner CHINA FIRST METALLURGICAL GROUP
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