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Super-early-strength type ultra-high performance concrete and preparation method thereof

An ultra-high-performance, ultra-early-strength technology, applied in the field of building materials, can solve problems such as inability to repair quickly, and achieve the effect of improving compactness, long working time and good durability

Pending Publication Date: 2021-10-08
华新超可隆新型建材科技(黄石)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the necessary quick hardening or early strengthening measures are not taken for this product, it usually takes 1 day to reach the 30MPa compressive strength index requirement for quick maintenance and open construction, and it cannot really achieve quick repair

Method used

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  • Super-early-strength type ultra-high performance concrete and preparation method thereof
  • Super-early-strength type ultra-high performance concrete and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0040] The preparation method of the above-mentioned ultra-early-strength ultra-high performance concrete comprises the following steps:

[0041] Pre-mix the cement, silica fume, fly ash, aggregate, retarder and slaked lime in the formulated amount for 1-10 minutes, add the formulated amount of water and water reducing agent, stir for 5-15 minutes until the slurry is produced, and finally add the formulated amount A small amount of steel fiber and coagulant, stirred for 1-10 minutes, moved into the mold, cured and demoulded, to obtain ultra-early-strength ultra-high performance concrete.

Embodiment 1

[0043] A super-early-strength ultra-high-performance concrete, comprising the following components in parts by weight:

[0044] 50 parts of cement, 10 parts of silica fume, 5 parts of fly ash, 80 parts of aggregate, 2 parts of slaked lime, 25 parts of steel fiber, 5 parts of water reducing agent, 0.5 part of retarder, 0.2 part of coagulation accelerator, 30 parts of water .

[0045] Among them, the cement is R·SAC42.5 type rapid hardening sulfoaluminate cement, and the specific surface area of ​​the cement is 360m 2 / kg.

[0046] The specific surface area of ​​silica fume is 15000m 2 / kg, the activity index of silica fume is 106%, SiO in silica fume 2 The mass content is 95%.

[0047] The specific surface area of ​​fly ash is 550m 2 / kg, the loss on ignition of fly ash is 3.6%, and the water demand ratio of fly ash is 94%.

[0048] The aggregate is quartz sand, the fineness modulus of the aggregate is 1.9, and the crushing value of the aggregate is 6%.

[0049] Slaked l...

Embodiment 2

[0056] A super-early-strength ultra-high-performance concrete, comprising the following components in parts by weight:

[0057] 100 parts of cement, 30 parts of silica fume, 20 parts of fly ash, 150 parts of aggregate, 0.1 part of slaked lime, 5 parts of steel fiber, 1 part of water reducing agent, 0.05 part of setting retarder, 0.01 part of setting accelerator, 10 parts of water .

[0058] Among them, the cement is R·SAC52.5 type rapid hardening sulfoaluminate cement, and the specific surface area of ​​the cement is 370m 2 / kg.

[0059] The specific surface area of ​​silica fume is 16000m 2 / kg, the activity index of silica fume is 105%, SiO in silica fume 2 The mass content is 93%.

[0060] The specific surface area of ​​fly ash is 580m 2 / kg, the loss on ignition of fly ash is 3%, and the water demand ratio of fly ash is 95%.

[0061] The aggregate is machine-made sand, the fineness modulus of the aggregate is 2.7, and the crushing value of the aggregate is 10%.

[0...

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Abstract

The invention discloses super-early-strength type ultra-high performance concrete and a preparation method thereof, and belongs to the technical field of building materials. The super-early-strength type ultra-high performance concrete is prepared from the following components in parts by weight: 50 to 100 parts of cement, 10 to 30 parts of silica fume, 5 to 20 parts of fly ash, 80 to 150 parts of aggregate, 0.1 to 2 parts of slaked lime, 5 to 25 parts of steel fiber, 1 to 5 parts of a water reducing agent, 0.05 to 0.5 part of a retarder, 0.01 to 0.2 part of a coagulant and 10 to 30 parts of water. The super-early-strength type ultra-high performance concrete has the characteristics of super early strength, ultrahigh later strength, ultrahigh durability, controllable setting time, excellent working performance and the like, and has important practical value in various emergency repair projects and winter construction projects. The invention further discloses a preparation method of the super-early-strength type ultra-high performance concrete, wherein the preparation method is simple, easy to operate, easy to control preparation conditions and low in requirement for production equipment, and is easy to achieve industrial production .

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a super-early-strength ultra-high-performance concrete and a preparation method thereof. Background technique [0002] With the extension of the service life of concrete structures and the increasing traffic pressure, the demand for rapid repair materials in municipal engineering has shown a significant upward trend in recent years. The main engineering parts that need to be repaired include: bridges, tunnels, viaducts, roads, etc. [0003] Generally, the materials used in the rapid repair of the above-mentioned engineering parts are rapid-hardening materials. At present, domestic rapid-hardening materials mostly use sulphoaluminate cement as the main raw material. Rapid hardening sulfoaluminate cement has the characteristics of short setting time and good low temperature performance, and is widely used in repair projects, but it has many defects, such as large shrinka...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06
CPCC04B28/06C04B2201/50C04B2201/52C04B18/08C04B18/146C04B22/064C04B14/06C04B14/48C04B2103/302C04B22/0013C04B22/10C04B24/06C04B22/147C04B22/124
Inventor 刘勇强商得辰王加军余松柏张文进
Owner 华新超可隆新型建材科技(黄石)有限公司
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