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Micro-expansive concrete suitable for corrugated steel webs

A corrugated steel web and concrete composition technology, which is applied in the field of building materials, can solve the problems of poor uniformity, loss of integrity, and many cavities in the lining concrete, so as to avoid cracking and voiding, reduce self-weight, and increase construction speed Effect

Inactive Publication Date: 2019-06-18
山东高速高广公路有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary concrete is affected by temperature shrinkage and drying shrinkage, and is prone to voids and loses integrity. Since the lining concrete exists inside the steel web and inside the box girder, it is difficult to vibrate during construction, so the lining concrete often Disadvantages such as poor uniformity and many voids

Method used

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  • Micro-expansive concrete suitable for corrugated steel webs
  • Micro-expansive concrete suitable for corrugated steel webs
  • Micro-expansive concrete suitable for corrugated steel webs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0111] (1) Prepare raw materials:

[0112] Cement: P O42.5 ordinary Portland cement, apparent density is 3.10g / cm 3 .

[0113] Fine aggregate: medium sand, <5mm, qualified for grading. The performance indicators of medium sand are shown in Table 1.

[0114] Sand performance index in Table 1

[0115]

[0116] Natural coarse aggregate: crushed stone with a continuous particle size of 5-20mm, and an apparent density of 2.75g / cm 3 , bulk density is 1.35g / cm 3 , The water absorption rate is 0.45%.

[0117] Recycled Coarse Aggregate: Sorting, crushing and screening the waste concrete in construction waste, such as waste concrete, waste mortar, waste bricks and tiles in construction (construction) waste, and screening out those less than 9.50mm and greater than 20mm After granulation, the recycled coarse aggregate is processed with the aggregate particle size in the range of 10mm to 20mm. Its performance is shown in Table 2.

[0118] Table 2 Performance indicators of recyc...

Embodiment 8-11

[0138] Embodiment 8-11 Concrete deformation performance testing experiment

[0139] The purpose of the experiment: To analyze the influence of different amounts of MgO and steel slag powder on the deformation properties of concrete

[0140] Test method: Concrete embedded strain gauge to measure its drying shrinkage. Specific method: After demoulding, the specimen is cured under dry conditions with a temperature of (20±1)°C and a relative humidity of (60±5)% (control the humidity with NaBr saturated salt solution). Used to measure the expansion rate L of concrete A The calculation formula: L A =[(L 1 -L0) / L]×100%, where L 0 is the initial length, L 1 L is the length of concrete at the corresponding age, and L is the effective length of the specimen, which is 250mm; the calculation formula for measuring the strain of concrete is as follows:

[0141] ε m =k(F-F 0 )+(b-α)(T-T 0 )

[0142] Where: ε m is the strain of the measured object, unit 10 -6 / F;

[0143] K is th...

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Abstract

The application provides micro-expansive concrete suitable for corrugated steel webs, which is made from, by weight, 150-250 parts of cement, 15-100 parts of slag powder, 250-400 parts of fine aggregate, 100-150 parts of natural coarse aggregate, 100-200 parts of light aggregate, 50-150 parts of recycled coarse aggregate, 5-50 parts of a magnesia expander, 0.5-10 parts of a water reducer, and 50-100 parts of water. The micro-expansive concrete is light in weight and free of contraction and has micro expansion; uniformity and size stability of lining concrete can be improved effectively; loss of integrity due to separation of the lining concrete and steel webs is avoided; the requirement on green concrete is met.

Description

technical field [0001] This application relates to the technical field of building materials, in particular, to a microstructure suitable for corrugated steel webs [0002] expanded concrete. Background technique [0003] Corrugated steel web prestressed concrete box girder bridge, also known as corrugated steel web PC bridge, refers to a box girder that uses corrugated steel plates instead of concrete webs of prestressed concrete box girders as webs. Its notable feature is that it uses 10~ The 20mm thick steel plate replaces the 30-80cm thick concrete web. The corrugated steel web prestressed concrete box girder bridge includes a concrete roof and a concrete floor under the concrete roof. The two are connected by a corrugated steel web. , completely solved the problem that the concrete web is easy to crack, and at the same time adopted external prestressing, and the prestressing efficiency was greatly improved, so it gradually became one of the main bridge types of medium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B38/08
Inventor 姜竹昌江飞飞曹洪亮尹永胜茆忠阳马剑
Owner 山东高速高广公路有限公司
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