Self-compacting concrete for floor heating protection layer and preparation method thereof

A technology of self-compacting concrete and protective layer, which is applied in the field of self-compacting concrete to achieve the effect of small dry apparent density, small load and avoid shrinkage cracking

Active Publication Date: 2021-09-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the technical problems existing in the prior art, the present invention provides a kind of self-compacting concrete used for floor heating protective layer and its preparation method, in order to solve the existing The fine stone concrete or mortar protective layer of the floor heating protective layer is prone to cracking, and the dry apparent density is relatively large, so the load on the floor is relatively large

Method used

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  • Self-compacting concrete for floor heating protection layer and preparation method thereof

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preparation example Construction

[0028] as attached figure 1 Shown, the present invention also provides a kind of preparation method for the self-compacting concrete of ground heating protective layer, comprises the following steps:

[0029] Step 1. According to the mass fraction requirements of each raw material, take sulfur-fixing ash, slag and cement, put them into a forced mixer, and stir the dry materials to obtain uniformly mixed dry materials.

[0030] Step 2. Add 2 / 3 weight of water to the uniformly mixed dry material, and stir to obtain a viscous mixture; wherein, the stirring time is 60-80s, and the stirring rate is 45r / min.

[0031] Step 3. Add the water reducer to the remaining water, mix and add to the viscous mixture in step 2, and stir to obtain the self-compacting concrete; wherein, the stirring time is 160-180s, and the stirring rate is 45r / min.

[0032] The self-compacting concrete for floor heating protective layer and its preparation method according to the present invention adopts slag...

Embodiment 1

[0035] This embodiment 1 provides a kind of self-compacting concrete that is used for floor heating protective layer, and the raw material composition of described self-compacting concrete comprises:

[0036] P.O42.5 Ordinary Portland Cement: 210kg;

[0037] Sulfur-fixing ash: 600kg;

[0038] Slag: 605kg;

[0039] Polycarboxylate high-performance water reducer: 18kg;

[0040] Water: 285kg.

[0041]Among them, the solid content of polycarboxylate high-performance water reducer is 30%; the average particle size of sulfur-fixing ash is 40μm, and the specific surface area is 425m 2 / kg, the loss on ignition is 7%; the slag is the coal-fired waste slag discharged from the coal-fired power plant, and the fineness modulus of the slag is 2.6.

[0042] making process:

[0043] Step 1. According to the mass fraction requirements of each raw material, take sulfur-fixing ash, slag and cement, put them into a single-horizontal shaft forced mixer, and stir the dry materials to obtain u...

Embodiment 2

[0048] This embodiment 2 provides a kind of self-compacting concrete that is used for floor heating protective layer, and the raw material composition of described self-compacting concrete comprises:

[0049] P.O42.5 Ordinary Portland Cement: 260kg;

[0050] Sulfur-fixing ash: 530kg;

[0051] Slag: 710kg;

[0052] Polycarboxylate high-performance water reducer: 27kg;

[0053] Water: 260kg.

[0054] Among them, the solid content of polycarboxylate high-performance water reducer is 20%; the average particle size of sulfur-fixing ash is 30μm, and the specific surface area is 450m 2 / kg, the loss on ignition is 4%; the slag is the coal-burning waste slag discharged from the boiler, and the fineness modulus of the slag is 2.7.

[0055] making process:

[0056] Step 1. According to the mass fraction requirements of each raw material, take sulfur-fixing ash, slag and cement, put them into a single-horizontal shaft forced mixer, and stir the dry materials to obtain uniformly mixe...

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Abstract

The invention discloses a self-compacting concrete for a floor heating protection layer and a preparation method thereof, the self-compacting concrete comprises the following raw materials in percentage by mass: 30%-35% of fluidized bed combustion ash, 35%-40% of slag, 12%-18% of cement, 1.0%-2.0% of a water reducing agent and 15%-18% of water, and the sum of the mass percentages of the raw materials is 100%. According to the invention, the furnace slag is used as aggregate, the fluidized bed combustion ash and the cement are used as gel materials, and the volcanic ash activity, self-hardening performance and expansion performance of the fluidized bed combustion ash are fully utilized; shrinkage cracking of the floor heating protection layer is avoided; as the apparent density of the furnace slag is small, the dry apparent density of the self-compacting concrete prepared from the fluidized bed combustion ash and the furnace slag is small, and the increased load on the floor is small.

Description

technical field [0001] The invention belongs to the technical field of self-compacting concrete, and in particular relates to self-compacting concrete used for floor heating protective layers and a preparation method thereof. Background technique [0002] With the rapid promotion of low-temperature floor heating technology, "Technical Regulations for Radiant Heating and Cooling" (JGJ142-2012) stipulates that the floor heating protection layer requires the use of pea-stone concrete or M10 cement mortar with a strength grade of C15; among them, pea-stone concrete The particle size of pea stone should be 5mm-12mm; most of the actual projects use C15 fine stone concrete; the concrete protective layer disclosed in the Chinese patent application "a low-temperature floor radiation heating construction structure (application number: 201320189530.6)" is made of cement, yellow The ratio of sand and bluestone is 1:2:3, and the thickness is 15mm to 50mm; however, due to the large surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/20C04B2201/32C04B2201/50C04B18/08C04B18/10C04B2103/302Y02W30/91
Inventor 何娟胡婷婷宋学锋伍勇华余书亚
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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