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Low-shrinkage ultra-high performance concrete and preparation method thereof

An ultra-high-performance concrete technology, applied in the field of concrete, can solve the problems of reducing UHPC compressive strength, reducing strength, and poor stability, and achieves the effects of reduced preparation cost, improved compressive strength, and significant early expansion performance

Active Publication Date: 2020-06-16
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned technical means for reducing UHPC materials are mainly improved and optimized through the addition of internal maintenance chemical additives (SAP), the use of mineral expansion agents, or changes in the types of mineral admixtures. However, the most important Portland cement is used as the concrete material, without any change
There are still certain problems in these existing technical means, such as the use of internal curing chemical admixtures (SAP) will significantly reduce the compressive strength of UHPC, and the use of calcium sulfoaluminate-calcium oxide expansion agents will cause the volume of UHPC materials to decrease. Poor stability and also reduced strength

Method used

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  • Low-shrinkage ultra-high performance concrete and preparation method thereof
  • Low-shrinkage ultra-high performance concrete and preparation method thereof
  • Low-shrinkage ultra-high performance concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Preparation of expansive high belite sulphoaluminate cement clinker powder

[0036] According to the raw meal weight ratio and batching rate value shown in Table 1, grinding to obtain 1.0 tons of raw meal with a fineness of 0.08mm and a sieve residue of less than 6%, after calcining at 1300 ° C in a rotary kiln, 0.70 tons (raw meal burned Loss of 30%) high expansibility belite sulfoaluminate cement clinker, after grinding to obtain a specific surface area of ​​400 ~ 500m 2 / kg of expansive high belite sulphoaluminate cement clinker powder.

[0037] Table 1 Raw meal ratio and ingredient rate values

[0038]

[0039] The mineral composition of high expansibility Belite sulfoaluminate cement clinker is shown in Table 2.

[0040] Table 2 Mineral composition of high expansion belite sulfoaluminate cement clinker

[0041]

[0042] According to the standard GB17671-1999 "Cement Mortar Strength Test Method (ISO Method)", GB / T1346-2011 "Cement Standard Consist...

Embodiment 2

[0047] The preparation of embodiment 2 special composite cementitious materials

[0048] According to the weight ratio shown in Table 4, each component was sequentially added into the dry powder mixer, and after thorough and uniform mixing, a low-shrinkage UHPC special composite gelling material was obtained.

[0049] Table 4 Weight ratio of special composite cementitious materials

[0050]

[0051] Using the standard GB17671-1999 "Cement Mortar Strength Test Method (ISO Method)" and GB / T1346-2011 "Cement Standard Consistency Water Consumption, Setting Time, and Stability Test Method", the physical properties of the above-mentioned groups of special composite cementitious materials The performance was measured. Referring to the ASTM C1698 standard, the bellows method was used to measure the 3d self-shrinkage value of the cementitious slurry sample (water-cement ratio 0.3). The results are shown in Table 5.

[0052] Table 5 Physical properties of special composite cementiti...

Embodiment 3

[0056] Embodiment 3 Preparation of low-shrinkage UHPC

[0057] In this embodiment, the quartz sand is washed and dried sand with a maximum particle size ≤ 1.5mm; the SiO in silica fume 2 The content is greater than 95%, and the specific surface area is not less than 20000m 2 / kg; the water demand ratio of Class I fly ash is not more than 90%, and the specific surface area is 450-500m 2 / kg; the water reducing agent is a polycarboxylate high-efficiency water reducing agent, and the water reducing rate is greater than 30%; the length of the copper-plated steel fiber is 10mm-15mm, and the diameter is 0.15mm-0.2mm.

[0058] Group number 1:

[0059] Weigh each raw material component according to the following weight: 800g special composite cementitious material; 80g silica fume; 200g grade I fly ash; 140g copper-plated steel fiber; 15g water reducing agent; 1100g quartz sand; 180g water.

[0060] The preparation method is: pour the special composite cementitious material, silica...

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Abstract

The invention relates to low-shrinkage ultra-high performance concrete, which is prepared from the following raw materials in parts by weight: 800 to 900 parts of a special composite cementing material; 50 to 80 parts of silica fume; 200 to 250 parts of I-grade fly ash; 140 to 160 parts of copper-plated steel fibers; 15-20 parts of a water reducing agent; 1000 to 1100 parts of quartz sand; 160-180parts of water. The special composite cementing material is prepared by uniformly dry-mixing the following raw materials in parts by weight: 75-85 parts of Portland cement clinker powder; 10 to 20 parts of expansive high-belite calcium sulfoaluminate cement clinker powder; 5-10 parts of anhydrite powder. According to the invention, the UHPC self-shrinkage value is small; and the 7d self-shrinkage value ranges from 300 ppm to 350 ppm, the later cracking risk of the UHPC material is reduced, component deformation is reduced, the ultrahigh strength and durability are achieved, the 1d compressive strength reaches 60 MPa to 70 MPa, the 28d compressive strength reaches 160 MPa to 180 MPa, the liquidity is good, and the preparation cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a low-shrinkage ultra-high performance concrete and a preparation method thereof. Background technique [0002] Ultra-high performance concrete (UHPC for short) is the most innovative technology in the field of concrete materials in recent years. It has the advantages of ultra-high strength (above 120MPa), high corrosion resistance and durability, which can reduce structure size, reduce structure weight, save space, reduce energy consumption, and reduce structure maintenance and reconstruction costs. At present, UHPC has been applied in the integration of architectural decoration and structure, long-span bridge structure, wet joint connection of prefabricated building components, anti-scouring hydraulic engineering, offshore oil production platform engineering, and maintenance reinforcement and repair of some major projects. , embodies outstanding performance advant...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/44C04B7/52C04B11/30C04B28/14C04B111/20C04B111/72
CPCC04B7/323C04B7/44C04B7/52C04B11/30C04B28/14C04B2111/2038C04B2111/72C04B2201/50C04B7/02C04B18/146C04B18/08C04B14/06C04B14/48C04B2103/302Y02P40/10
Inventor 姚丕强赵艳妍
Owner TIANJIN CEMENT IND DESIGN & RES INST
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