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A kind of concrete with low heat of hydration and high strength volume and preparation method thereof

A mass concrete, low hydration heat technology, applied in the field of high-performance building materials, can solve the problems of low hydration heat, unfavorable concrete pumping construction, concrete bleeding, etc., to reduce bleeding problems, enhance later strength and Anti-sulfate corrosion ability, the effect of enhancing the density

Active Publication Date: 2021-12-14
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a large-volume concrete for the slab transfer layer, which has low heat of hydration, high strength, and good work performance and durability, for the complex and harsh overseas construction environment; and the process involved Simple, easy to operate, suitable for popularization and application; at the same time, it can effectively solve the problems of concrete bleeding due to excessive adsorption of water on the surface of fine particles of mineral powder when the amount of mineral powder is too high, which is not conducive to concrete pumping construction.

Method used

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  • A kind of concrete with low heat of hydration and high strength volume and preparation method thereof
  • A kind of concrete with low heat of hydration and high strength volume and preparation method thereof
  • A kind of concrete with low heat of hydration and high strength volume and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] A low heat of hydration high-strength mass concrete for a transfer layer. The raw materials for preparing mass concrete per cubic meter include: 145kg of cement, 270kg of mineral powder, 820kg of sand, 925kg of stone, 125kg of water, 30kg of crushed ice and 9.4 kg (admixture components are: self-made polycarboxylate superplasticizer 6.6kg, sodium gluconate 1.2kg, cellulose ether 1.2kg);

[0038] Its preparation method comprises the following steps:

[0039]Mix and stir stone, sand and 70wt% water for 20s to obtain a wet mixed aggregate, add cement to the wet mixed aggregate and stir evenly to obtain a cement-containing mixture; add remaining Stir water, crushed ice, mineral powder and self-made admixture for 60 seconds to obtain mass concrete; then pour according to the requirements of the slab transfer layer; perform six-sided curing on the pouring transfer layer, store 10cm of water on the upper surface, and place it 20cm above the water cover the film to achieve the...

Embodiment 2

[0041] A kind of low heat of hydration high-strength mass concrete for transfer layer, the preparation raw materials of mass concrete per cubic meter include: cement 83kg, mineral powder 332kg, sand 850kg, stone 900kg, water 100kg, crushed ice 50kg and compound admixture 9.4 kg (admixture components are: self-made polycarboxylate superplasticizer 6kg, sodium gluconate 1.2kg, cellulose ether 2.2kg);

[0042] Its preparation method comprises the following steps:

[0043] Mix and stir stone, sand and 70wt% water for 20s to obtain wet mixed aggregate, add cement to the wet mixed aggregate and stir for 40s to obtain a cement-containing mixture; add remaining Mix water, crushed ice, mineral powder and self-made admixture for 60 seconds to obtain a large-volume concrete mixture, then pour it according to the requirements of the slab transfer layer, perform six-sided curing on the pouring transfer layer, store 10cm of water on the upper surface, and place it on the water The 20cm squ...

Embodiment 3

[0045] A low-heat-of-hydration high-strength mass concrete for a transfer layer. The raw materials for preparing mass concrete per cubic meter include: 130kg of cement, 280kg of mineral powder, 850kg of sand, 900kg of stone, 120kg of water, 40kg of crushed ice and 8.4 kg (admixture components are: self-made polycarboxylate superplasticizer 6kg, sodium gluconate 1.2kg, cellulose ether 1.2kg);

[0046] Its preparation method comprises the following steps:

[0047] Place 10kg of crushed ice on the aggregate conveyor belt to lower the temperature of the aggregate, then mix and stir stone, sand, 10kg of crushed ice and 70wt% water for 20 seconds to obtain wet mixed aggregate, and add cement to the wet mixed aggregate Stir for 40s to obtain a cement-containing mixture; add remaining water, crushed ice, mineral powder and self-made admixtures to the cement-containing mixture and stir for 60s to obtain large-volume concrete, and then pour according to the requirements of the slab tran...

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Abstract

The invention discloses a low hydration heat high-strength large-volume concrete. The components and contents are: cement 83-145kg / m 3 , mineral powder 270~332kg / m 3 , water 100~140kg / m 3 , crushed ice 30~50kg, crushed stone 900~1100kg / m 3 , sand 750~900kg / m 3 , compound admixture 8~50kg / m 3 . The present invention adopts the binary cementation system of cement-mineral powder, uses a large amount of mineral powder to replace cement and combines functional admixtures, effectively reduces the amount of cement, improves the cracks and other problems caused by a large amount of heat generated by cement hydration, and further enhances the The compactness of concrete can improve the anti-sulfate corrosion resistance and strength of concrete, and effectively ensure the work performance and durability of the obtained mass concrete; and the process involved is simple, easy to operate, and low cost, and can be widely used in tropical rainforest climates Plate type conversion layer and other fields.

Description

technical field [0001] The invention belongs to the technical field of high-performance building materials, and in particular relates to a low heat of hydration high-strength mass concrete and a preparation method thereof. Background technique [0002] Mass concrete transfer floor, as a structural transition floor to realize "transformation function, multiple uses of the first floor", is currently the most commonly used structural form to achieve vertical transfer in high-rise buildings, and is increasingly used in modern buildings. In China, the beam-type transfer floor is a kind of transfer floor structure that is often used in high-rise buildings. The transfer method mainly uses the beams and load-bearing pillars in the frame structure of the building to provide stability for the transfer floor structure; while internationally, Due to the relatively free arrangement of the slab transfer floor, it is widely used; at the present stage, the design of the slab transfer struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B24/38C04B24/26C04B111/20
CPCC04B28/04C04B40/0039C04B2111/2015C04B2201/52C04B18/141C04B14/02C04B14/06C04B24/10C04B24/383C04B24/2694
Inventor 李兴王军赵日煦熊龙雷小焕
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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