Steam-curing-free early-strength steel fiber concrete pipe segment and preparation method thereof

A steel fiber concrete and steam-free curing technology, which is applied in the field of concrete segments, can solve the problems of high energy consumption and achieve the effects of fast setting and hardening, simplified curing methods, and shortened curing time

Inactive Publication Date: 2015-07-15
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing steel fiber concrete segments still need to be steamed
The curing system is a link that consumes a lot of energy in the production process of the segment. The traditional tunnel or subway concrete segment needs steam curing to make the strength develop rapidly and consume a lot of energy.

Method used

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  • Steam-curing-free early-strength steel fiber concrete pipe segment and preparation method thereof
  • Steam-curing-free early-strength steel fiber concrete pipe segment and preparation method thereof
  • Steam-curing-free early-strength steel fiber concrete pipe segment and preparation method thereof

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preparation example Construction

[0024] The preparation method of the above-mentioned steam-free, early-strength steel fiber concrete segment comprises the following steps:

[0025] Step 1. Pour the fine aggregate, coarse aggregate, and end-hook steel fiber into the mixing pot and dry mix for 30s~60s to stir evenly;

[0026] Step 2. Pour the formula quantity of ordinary Portland cement, rapid hardening sulphoaluminate cement, fly ash and slag into the mixing pot, add the formula quantity of water and polycarboxylate water reducer and wet mix for 2 to 3 minutes. Formed concrete;

[0027] Step 3: Pour the formed concrete into the mold, vibrate and compact it; release the mold after curing for 6h-8h under natural conditions; then immerse in saturated calcium hydroxide solution at 20°C for 24h, take out the natural curing for 28d, and obtain the non-steaming Yang, early strength steel fiber reinforced concrete segments.

Embodiment 1

[0032] 1. Raw material and mix ratio

[0033] The raw materials are Ordinary Portland Cement (OPC), Rapid Hardening Sulphoaluminate Cement (SAC), Fly Ash (FA), Slag (SG), Fine Aggregate (S), Coarse Aggregate (SZ), Water (W), polycarboxylate water reducer (WR), end hook steel fiber (GXW), the mix ratio design is shown in Table 2.

[0034] Table 2 (Unit: Kg / m 3 )

[0035]

[0036] 2. Preparation method:

[0037] 1) Pour the fine aggregate, coarse aggregate, and end-hook steel fiber into the mixing pot, and dry mix for 30 seconds to mix evenly;

[0038] 2) Pour ordinary Portland cement, rapid hardening sulphoaluminate cement, fly ash, and slag into the mixing pot, add water and polycarboxylate water reducer in the prescribed amount, and mix for 180 seconds to form concrete ;

[0039]3) Pour the formed concrete into the mold, vibrate and compact, release the mold after curing for 6h-8h under natural conditions, then immerse in saturated calcium hydroxide solution at 20°C f...

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Abstract

The invention discloses a steam-curing-free early-strength steel fiber concrete pipe segment comprising ordinary Portland cement, early-strength sulphoaluminate cement, fly ash, slag, fine aggregate, coarse aggregate, water, a polycarboxylic acid type water reducer and end hook type steel fibers. The invention also discloses a preparation method of the steam-curing-free early-strength steel fiber concrete pipe segment. The steam-curing-free early-strength steel fiber concrete pipe segment is quick in coagulation and hardening and high in early strength, can reach the strength of 15MPa required by pipe segment demolding in 6-8 hours, and can be prepared into a concrete pipe segment for an underground structure by performing water curing in a 20 DEG C saturated calcium hydroxide solution for 24 hours and then performing natural curing for 28 days. The steam-curing-free early-strength steel fiber concrete pipe segment does not need steam curing, so that the curing mode of the pipe segment can be simplified, the curing time is shortened, a lot of manpower and resources are saved, and the popularization and application values are high.

Description

technical field [0001] The invention relates to the technical field of concrete segments, in particular to a steam-cured, early-strength steel fiber concrete segment and a preparation method thereof. Background technique [0002] At present, concrete segment is the most important form of subway tunnel lining application. There are two types of concrete segment, one is the traditional reinforced concrete segment, that is, the concrete segment is equipped with steel bars according to technical requirements; the other is steel Fiber concrete segments. The traditional tunnel segment concrete basically adopts reinforced concrete. Usually, under the action of water seepage and stray current, the internal steel bars are easy to corrode and expand the concrete protective layer, resulting in poor durability and short life of the reinforced concrete segment; not only the preparation process is complicated, but also Steam maintenance and long-term water maintenance are required, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B14/48C04B18/30
CPCY02W30/91
Inventor 郭丽萍丁聪
Owner SOUTHEAST UNIV
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