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200MPa grade anti-bursting reactive powder concrete under construction site curing conditions and preparation method thereof

An active powder, construction site technology, applied in the field of building materials, can solve problems such as easy bursting, achieve good burst resistance, improve strength and compactness, and protect the environment.

Active Publication Date: 2016-09-21
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems that the strength of RPC200 is only 100MPa under the conditions of pouring and maintenance at the construction site, which is less than the theoretical value of 120MPa, and it is very easy to burst, etc., creatively improves the performance and dosage of active micro-powder and early strength agent, and optimizes the mix ratio , the method for re-mixing steel fiber and polypropylene fiber, improving the strength and anti-burst performance of RPC200 under the conditions of pouring and maintenance at the construction site, and proposing the present invention

Method used

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  • 200MPa grade anti-bursting reactive powder concrete under construction site curing conditions and preparation method thereof

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Effect test

Embodiment 1

[0036] A kind of 200MPa explosion-proof cracking-proof reactive powder concrete under the condition of maintenance on the construction site, each component is weighed according to the following mass parts:

[0037] Cement: 1 part, modified silica fume: 0.25 parts, finely ground slag: 0.20 parts, quartz sand: 1.15 parts, early-strength polycarboxylate superplasticizer: 0.035 parts, steel fiber: 0.15 parts, polypropylene fiber: 0.00175 parts, water: 0.18 parts.

[0038] Among them, the cement is P.O52.5 ordinary Portland cement; the specific surface area of ​​modified silica fume should be greater than 15000m 2 / kg, the 7-day activity index should be greater than 110%; the specific surface area of ​​the ground slag should be greater than 600m 2 / kg, 28d activity index should be greater than 115%; the main component of modified silica fume and ground slag is active SiO 2 ; SiO in quartz sand 2 The content is greater than 90%, the mass ratio of particle size 0.18-0.36mm to part...

Embodiment 2

[0041] A kind of 200MPa explosion-proof cracking-proof reactive powder concrete under the condition of maintenance on the construction site, each component is weighed according to the following mass parts:

[0042] Ordinary Portland cement (P.O 52.5): 1 part, modified silica fume: 0.30 parts, ground slag: 0.20 parts, quartz sand: 1.50 parts, early-strength polycarboxylate superplasticizer: 0.0375 parts, steel fiber : 0.20 parts, polypropylene fiber: 0.0025 parts, water: 0.20 parts.

[0043] Among them, the specific surface area of ​​modified silica fume should be greater than 15000m 2 / kg, the 7-day activity index should be greater than 110%; the specific surface area of ​​the ground slag should be greater than 600m 2 / kg, the 28-day activity index should be greater than 115%; the main component of modified silica fume and ground slag is active SiO 2 ; SiO in quartz sand 2 The content is greater than 90%, the mass ratio of particle size 0.18-0.36mm to particle size 0.36-0.6...

Embodiment 3

[0046] A kind of 200MPa explosion-proof cracking-proof reactive powder concrete under the condition of maintenance on the construction site, each component is weighed according to the following mass parts:

[0047] Ordinary Portland cement (P.O 52.5): 1 part, modified silica fume: 0.35 parts, ground slag: 0.35 parts, quartz sand: 1.50 parts, early-strength polycarboxylate superplasticizer: 0.040 parts, steel fiber : 0.25 parts, polypropylene fiber: 0.003 parts, water: 0.25 parts.

[0048] Among them, the specific surface area of ​​modified silica fume should be greater than 15000m 2 / kg, the 7-day activity index should be greater than 110%; the specific surface area of ​​the ground slag should be greater than 600m 2 / kg, the 28-day activity index should be greater than 115%; the main component of modified silica fume and ground slag is active SiO 2 ; SiO in quartz sand 2 The content is greater than 90%, the mass ratio of particle size 0.18-0.36mm to particle size 0.36-0.60m...

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Abstract

The invention discloses a 200MPa grade anti-bursting reactive powder concrete under construction site curing conditions and a preparation method thereof. The concrete is prepared from the following components by weight: 1 part of cement, 0.25-0.35 part of modified silica fume, 0.15-0.35 part of ground slag, 1.0-1.5 parts of quartz sand, 0.030-0.040 part of a polycarboxylate superplasticizer, 0.15-0.25 part of steel fiber, 0.00175-0.003 part of polypropylene fiber, and 0.20-0.25 part of water. The 200MPa grade anti-bursting reactive powder concrete provided by the invention has the advantages of simple process and strong operability, is suitable for extensive site construction and curing, and is in favor of popularization and application of reactive powder concrete. The use of slag and the non-high temperature steam curing conditions have important significance for protecting the environment and saving energy.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a 200MPa-level anti-explosion cracking active powder concrete and a preparation method thereof under maintenance conditions at the construction site (environment temperature is greater than 20° C., sprinkled with water for maintenance). Background technique [0002] Reactive Powder Concrete (RPC) is a new type of cement-based composite material. The theoretical strength of RPC200 should reach 120-230MPa. When it is formulated according to the existing mix ratio, it needs to be cured by 70-90℃ high-temperature steam to ensure its strength is greater than 120MPa. Due to the lack of high-temperature steam curing conditions at the construction site, the strength of RPC200 prepared with the existing mix ratio is only 100MPa, and it is easy to burst under large temperature difference or high temperature, which seriously restricts the wide application of RPC200 in engineeri...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B16/06C04B14/48C04B111/34
CPCC04B14/48C04B16/0633C04B28/04C04B2111/343C04B2201/50C04B18/146C04B18/141C04B14/06C04B24/24C04B22/002
Inventor 闫凯张鑫张国强贾强
Owner SHANDONG JIANZHU UNIV
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