A special composite cementitious material for preparing low-shrinkage ultra-high performance concrete

A composite cementitious material, ultra-high performance technology, used in the field of concrete to achieve excellent mechanical properties and durability, significant early expansion performance, and low shrinkage.

Active Publication Date: 2021-02-12
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the existing preparation technology and existing problems of reducing shrinkage of UHPC, the present invention provides a special composite cementitious material for preparing low-shrinkage ultra-high performance concrete

Method used

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  • A special composite cementitious material for preparing low-shrinkage ultra-high performance concrete
  • A special composite cementitious material for preparing low-shrinkage ultra-high performance concrete
  • A special composite cementitious material for preparing low-shrinkage ultra-high performance concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Preparation of expansive high belite sulphoaluminate cement clinker powder

[0024] 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.

[0025] Table 1 Raw meal ratio and ingredient rate value

[0026]

[0027] The mineral composition of high expansibility Belite sulfoaluminate cement clinker is shown in Table 2.

[0028] Table 2 Mineral Composition of Expansive High Belite Sulphoaluminate Cement Clinker

[0029]

[0030]According to the standard GB17671-1999 "Cement Mortar Strength Test Method (ISO Method)", GB / T1346-2011 "Cement Standard Consiste...

Embodiment 2

[0035] The preparation of embodiment 2 special composite cementitious materials

[0036] 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.

[0037] The weight ratio of the special composite cementitious material of table 4

[0038]

[0039] 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.

[0040] Table 5 Physical properties of special composite...

Embodiment 3

[0043] Embodiment 3 Preparation of low-shrinkage UHPC

[0044] 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.

[0045] Group number 1:

[0046] 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.

[0047] The preparation method is: pour the special composite cementitious material, silica...

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Abstract

The invention relates to a special composite cementitious material for preparing low-shrinkage ultra-high-performance concrete, which is obtained by dry mixing the following raw materials in parts by weight: 75-85 parts of Portland cement clinker powder; high-expansibility belite sulfur 10-20 parts of aluminate cement clinker powder; 5-10 parts of anhydrite powder. The batching parameters of the high expansibility Belite sulfoaluminate cement clinker are: the alkalinity coefficient Cm value is 1.4-1.6, fCaO is 5-8%, fSO 3 7 to 10%; mineral composition in weight percent: C 2 S is 40-50%, C 4 A 3 S is 25-35%, C 12 A 7 4~5%, CaSO 4 10-15%, fCaO is 4-8%, C 4 AF is 1 to 2%. The special composite cementitious material of the present invention has a self-shrinkage value of 350-380ppm in 3 days of clean pulp, and the compressive strength of each age is increased by 2-4Mpa; it can not only reduce the shrinkage value of UHPC, but also improve its strength and stability.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a special composite cementitious material for preparing low-shrinkage ultra-high-performance concrete. 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 outstandi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/30C04B7/345
CPCC04B7/3453C04B11/30Y02P40/10
Inventor 姚丕强赵艳妍
Owner TIANJIN CEMENT IND DESIGN & RES INST
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