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Concrete cementitious material, high-durability fair-faced concrete and preparation method thereof

A technology of fair-faced concrete and cementitious materials, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of chromatic aberration, chromatic aberration and air bubbles, to improve durability, increase compactness, reduce appearance bubble effect

Active Publication Date: 2020-07-24
CCCC THIRD HARBOR ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A new solution for fair-faced concrete is needed to solve the problems of color difference and air bubbles in existing fair-faced concrete
[0005] For this reason, the object of the present invention is to provide a kind of concrete cementitious material, high-durability fair-faced concrete and preparation method thereof, solve the external appearance problems such as color difference that common high-durability fair-faced concrete causes because of adding fly ash, and the prepared High-durability fair-faced concrete has high durability, and at the same time, there are no obvious bubbles on the surface and uniform color, which meets the requirements of high-durability fair-faced concrete

Method used

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  • Concrete cementitious material, high-durability fair-faced concrete and preparation method thereof
  • Concrete cementitious material, high-durability fair-faced concrete and preparation method thereof
  • Concrete cementitious material, high-durability fair-faced concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Raw materials: cement is P.Ⅱ52.5 Portland cement; granulated blast furnace slag powder is S95 granulated blast furnace slag powder; micro silica fume has a specific surface area of ​​18000m 2 / kg of silica fume, the activity index of 28 days is 95%; the loss on ignition of fine beads is 0.8%, the fineness is not more than 1.7μm, the water demand of standard mortar is 85%, and the 28d activity index is 114%; The water agent adopts polycarboxylate high-efficiency water-reducing agent, and the water-reducing rate is 26%; the coarse aggregate adopts continuous graded crushed stone with a particle size of 5-25mm, the content of needle flakes is 6.2%, the mud content is 0.42%, and the mud content The fine aggregate is 0.11%; the fine aggregate is natural river sand, the fineness modulus is 2.5, the mud content is 0.94%, and the mud content is 0.37%.

[0051] Mixing ratio of each raw material: cement 240kg / m 3 , mineral powder 192kg / m 3 , Silica fume 14.4kg / m 3 , fine sinki...

Embodiment 2

[0054] Raw materials: cement is P.O 42.5 ordinary Portland cement; fine aggregate is natural river sand with a fineness modulus of 2.7, a mud content of 1.52%, and a mud content of 0.68%; granulated blast furnace slag powder, microsilica powder, Fine sinking beads, water reducer, and coarse aggregate are the same as in Example 1.

[0055] Mixing ratio of each raw material: cement 264kg / m 3 , mineral powder 132kg / m 3 , Silica fume 17.6kg / m 3 , fine sinking beads 26.4kg / m 3 , gravel 1079kg / m 3 , river sand 735kg / m 3 , water 149.6kg / m 3 , water reducer 4.5kg / m 3 .

[0056] According to the preparation method of the aforementioned high-durability fair-faced concrete, the total mixing time is 160s, thereby preparing the corresponding high-durability fair-faced concrete.

Embodiment 3

[0058] Raw material: Polycarboxylate high-efficiency water reducer is used as water reducing agent, and the water reducing rate is 23%; the coarse aggregate is continuously graded crushed stone with a particle size of 5-20mm, the needle flake content is 8.5%, and the mud content is 0.73%. The mud content is 0.29%; the fine aggregate is natural river sand with a fineness modulus of 2.4, a mud content of 0.85%, and a mud content of 0.29%; example 1.

[0059] Mixing ratio of each raw material: cement 250kg / m 3 , mineral powder 200kg / m 3 , Silica fume 25kg / m 3 , fine sinking beads 25kg / m 3 , gravel 1048kg / m 3 , river sand 717kg / m 3 , water 150kg / m 3 , water reducer 6.5kg / m 3 .

[0060] According to the preparation method of the aforementioned high-durability fair-faced concrete, the total mixing time is 150s, thereby preparing the corresponding high-durability fair-faced concrete.

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Abstract

The invention discloses concrete cementing material, high-durability fair-faced concrete and a preparation method thereof. The fair-faced concrete is mainly prepared from 400-520kg / m<3> cementing materials, 1000-1100kg / m<3> coarse aggregates, 650-780kg / m<3> fine aggregates being sand, a water reducing agent and water. The cementing materials include, by weight, 40-70 parts of cement, 20-50 parts of granulated blast-furnace slag powder, 1-5 parts of silica fume and 1-7 parts of fine sinking beads; water is 0.29-0.36 times of the weight of the cementing materials, and the water reducing agent is 0.08-0.15 times of the weight of the cementing materials. The high-durability fair-faced concrete has advantages that by removal of coal ash and addition of fine sinking beads and silica fume, average bubble chord length is decreased, compactness is improved, the problem of fair-faced concrete appearance color difference caused by the coal ash is avoided while appearance bubbles are reduced, durability is improved, and requirements of high-durability fair-faced concrete are met.

Description

technical field [0001] The invention belongs to the field of civil engineering building materials, and in particular relates to fair-faced concrete technology. Background technique [0002] Fair-faced concrete is a kind of concrete that directly uses the natural texture of concrete molding as a decorative effect. It belongs to one-time pouring molding and does not need any appearance decoration. Because it has a very decorative effect, it is also called decorative concrete. Clear-water concrete is the simplest architectural language and the most advanced form of expression in concrete materials. What it shows is the most essential a kind of aesthetic feeling, embodiment be the grade of " wearing no makeup to the heavens ". Fair-faced concrete is a resource-saving and environment-friendly building material. Some landmark buildings in the world, such as Sydney Opera House, Japan National Grand Theater, Paris Prehistoric Museum and other world-renowned art public buildings, all...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/14C04B14/04C04B111/20
CPCC04B14/041C04B18/146C04B28/04C04B2111/20C04B18/142C04B14/02C04B14/068C04B24/24Y02W30/91
Inventor 谷坤鹏陈克伟王成启刘海青赵辉刘思楠田峻源莫日雄张晓乐梁远博聂亚楠
Owner CCCC THIRD HARBOR ENG
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