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Normal-temperature curing type high-early-strength concrete and preparation method thereof

A concrete and early-strength technology, applied in the field of early-strength concrete and early-strength concrete cured at room temperature, can solve the problems of high energy consumption, poor later strength and durability, and low early-strength concrete of steam curing early-strength concrete, and avoid the problems of early-strength concrete. Excessive curing speed, excellent late strength and durability, and energy saving effect

Inactive Publication Date: 2017-06-13
CCCC WUHAN HARBOR ENG DESIGN & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention aims at the defects of high energy consumption and poor later performance of the existing steam-cured early-strength concrete; at the same time, the high cost of using the early-strength concrete with sulphoaluminate cement
In order to better solve the problem of low early-strength concrete, a kind of early-strength concrete or super-early-strength concrete that can be cured at room temperature is provided to meet the needs of engineering for early-strength concrete, and to overcome the high cost of traditional technical means, and the later strength and Disadvantages of poor durability

Method used

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  • Normal-temperature curing type high-early-strength concrete and preparation method thereof
  • Normal-temperature curing type high-early-strength concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Concrete raw materials are taken according to the following proportions by weight: 100 parts of Portland cement, 20 parts of fly ash, 4 parts of silica fume, 8 parts of metakaolin, 220 parts of natural sand, 310 parts of gravel, and 0.7 parts of polycarboxylate superplasticizer part, 41 parts of mixing water. These raw materials are mixed according to a proper mixing method, and the early-strength concrete is obtained after mixing evenly. The early-strength concrete was prepared and cured at room temperature, and its compressive strength reached 16.5MPa in 10 hours, and the test showed that its compressive strength in 28 days reached 65.1MPa.

Embodiment 2-6

[0030] The early-strength concrete was prepared according to the same method as in Example 1, and the proportions by weight of the concrete raw materials used in the preparation process were shown in Table 1 below. The prepared concrete samples were prepared into squares, cured at room temperature, and the compressive strength of 10h and 28d was tested.

[0031] One of table 1 early-strength concrete formula ratio (unit: parts by weight)

[0032]

[0033]

[0034] *The unit of compressive strength is MPa.

[0035] It can be seen from Table 1 that the overall quality of concrete is better, and it can basically reach the demoulding strength requirement of 15Mpa in 10 hours, which has important application significance for the environment that requires the properties of early strength and super early strength of concrete.

Embodiment 7-11

[0037] Weigh the raw materials according to the ratio of raw materials recorded in Table 2, and mix Portland cement, fly ash, silica fume and high-grade soil under the condition of 15°C to 35°C, and stir evenly. Then, add natural sand and gravel to the mixture of cementitious materials and stir for 8-120 seconds. Finally, mix the polycarboxylate water reducer and tap water and add it into the mixture mixed with sand and gravel, stir for 90-180 seconds, preferably 90-150 seconds, stop, and get the early-strength concrete. The early-strength concrete was made into a square, cured at room temperature, and its 10h and 28d compressive strength was tested.

[0038] Two (weight parts) of early-strength concrete formula ratio of table 2

[0039] Example 7 Example 8 Example 9 Example 10 Example 11 Portland cement 100 100 100 100 100 fly ash 29 15 22 23 19 Silica fume 4 4 3 4 5 Metakaolin 7 9 8 9 8 natural sand 200 240 ...

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Abstract

The invention discloses high-early-strength concrete and a preparation method thereof. The high-early-strength concrete comprises, by weight, 100 parts of Portland cement, 10-30 parts of coal ash, 3-5 parts of silicon ash, 5-10 parts of metakaolin, 180-250 parts of natural sand, 280-350 parts of gravel, 0.6-1.0 part of polycarboxylate superplasticizer and 37-48 parts of mixing water. The high-early-strength concrete has advantages that the concrete adopts a coal ash, silicon ash and metakaolin composite binding material system, quick increasing of early strength is promoted under the interaction of the components of the binding material, the composite binding material system is matched with an appropriate aggregate component, the compressive strength of the concrete can be higher than 20MPa after 100 hours of normal-temperature curing, and the high-early-strength concrete can reach a superhigh-early-strength level.

Description

technical field [0001] The invention belongs to the field of civil construction engineering and relates to early-strength concrete, in particular to (super) early-strength concrete cured at normal temperature, which can be widely used in various bridge and tunnel projects. Background technique [0002] In the prior art, in order to solve the problem of low early strength of concrete, when prefabricating concrete components, steam curing is often used to accelerate concrete hydration, so that the compressive strength of concrete can reach more than 15MPa 10 hours after forming, exceeding the demoulding strength In this way, the turnover of molds is accelerated, investment is saved, and production efficiency is improved; when steam curing cannot be used, people often replace ordinary Portland cement with sulphoaluminate cement, because sulphoaluminate cement has the characteristics of rapid hardening and thus Improve the early strength of concrete members. [0003] The above ...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/08C04B18/146C04B14/041C04B14/06C04B14/02C04B2103/302
Inventor 焦运攀占文李红君周绍豪刘可心徐文冰
Owner CCCC WUHAN HARBOR ENG DESIGN & RES
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