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Special sprayed concrete material for tunnel high-ground-temperature dry-hot environment

A shotcrete, high ground temperature technology, applied in the field of concrete, can solve the problems of loss of cohesion, increase of concrete rebound, failure of surrounding rock support, etc.

Active Publication Date: 2020-05-29
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ordinary shotcrete is mainly composed of cement, ordinary sandstone and quick-setting agent. In the hot and dry environment of high ground temperature, the springback of ordinary shotcrete increases significantly, the cohesion loss is serious, and even debonding and cracking occur. The failure of protective effect has become a key factor affecting the performance of shotcrete with high ground temperature, and there is no effective solution so far

Method used

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  • Special sprayed concrete material for tunnel high-ground-temperature dry-hot environment
  • Special sprayed concrete material for tunnel high-ground-temperature dry-hot environment
  • Special sprayed concrete material for tunnel high-ground-temperature dry-hot environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: 100°C high ground temperature and dry heat environment

[0016] Application of main raw materials and main proportion parameters of concrete per cubic meter:

[0017] (1) The total amount of cementitious materials is 420kg (83% ordinary Portland cement, 15% sulphoaluminate cement, 2% nano-silicon oxide);

[0018] (2) 775kg of stones;

[0019] (3) Steel fiber 45kg;

[0020] (4) The amount of shrinkage reducing agent is 5%;

[0021] (5) The dosage of water reducer JX-GBNHy2 high-performance polycarboxylic acid is 1.2%;

[0022] (6) Accelerator JX-E 3 Liquid dosage 5%;

[0023] (7) The glue-bone ratio is 1:4.1; the sand rate is 0.55; the water-binder ratio is 0.45.

[0024] The specific mix ratio is shown in Table 1 below (unit: kg).

[0025] Table 1 Application of main raw materials per cubic meter of concrete in Example 1

[0026]

[0027] Technical index tests include: slump, compressive strength, split tensile strength, bond strength and rebound r...

Embodiment 2

[0031] Example 2: Dry and hot environment with high ground temperature of 80°C

[0032] Application of main raw materials and main proportion parameters of concrete per cubic meter:

[0033] (1) The total amount of cementitious materials is 400kg (88% ordinary Portland cement, 11% sulphoaluminate cement, 1% nano-silicon oxide);

[0034] (2) 758kg of stones;

[0035] (3) Steel fiber 40kg;

[0036] (4) The amount of shrinkage reducing agent is 5%;

[0037] (5) The dosage of water reducer JX-GBNHy2 high-performance polycarboxylic acid is 1.2%;

[0038] (6) Accelerator JX-E 3 Liquid dosage 5%;

[0039] (7) The glue-bone ratio is 1:4.3; the sand ratio is 0.56; the water-binder ratio is 0.47.

[0040] The specific mix ratio is shown in the following table 2 (unit: kg).

[0041] Table 3 Application of main raw materials per cubic meter of concrete in Example 2

[0042]

[0043]Technical index tests include: slump, compressive strength, split tensile strength, bond strength...

Embodiment 3

[0047] Example 3: Dry and hot environment with high ground temperature of 60°C

[0048] (1) The total amount of cementitious materials is 400kg (89% ordinary Portland cement, 10% sulphoaluminate cement, 1% nano-silicon oxide);

[0049] (2) 758kg of stones;

[0050] (3) Steel fiber 39kg;

[0051] (4) The amount of shrinkage reducing agent is 5%;

[0052] (5) The dosage of water reducer JX-GBNHy2 high-performance polycarboxylic acid is 1.1%;

[0053] (6) Accelerator JX-E 3 Liquid dosage 5%;

[0054] (7) The glue-bone ratio is 1:4.3; the sand rate is 0.56; the water-binder ratio is 0.48.

[0055] The specific matching ratio is as follows (unit: kg)

[0056] Table 5 Application of main raw materials per cubic meter of concrete in Example 3

[0057]

[0058] Technical index tests include: slump, compressive strength, split tensile strength, bond strength and rebound rate. The comparison results of the concrete test results of Example 3 and the benchmark working condition...

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Abstract

The invention discloses a special sprayed concrete material for a tunnel high-ground-temperature dry-hot environment. The total amount of cementing materials of concrete is 400-420 kg per cubic meter;the cementing material comprises the components in percentage by weight: 83%-89% of ordinary Portland cement, 10%-15% of sulphoaluminate cement and 1%-2% of nano silicon dioxide. Steel fibers are doped according to the volume ratio of 0.4%-0.6%; a shrinkage reducing agent is doped according to 5% of the weight of the cementing material; a setting accelerator is doped according to 3-5% of the weight of the cementing material when the concrete is prepared; the ratio of glue to bone is 1:4.0-1:4.5; the water-binder ratio is not greater than 0.50. The special sprayed concrete provided by the invention has higher compressive strength and tensile strength than common shotcrete with the same strength grade under the synergistic effect of materials with a certain proportioning ratio. According todifferent dry and hot environment temperatures, the bonding strength is 2-4 times of that of common sprayed concrete, and the rebound rate is only 1 / 3-1 / 2 of that of the common sprayed concrete.

Description

[0001] Technical field [0002] The technology of the invention belongs to the field of concrete, and in particular relates to a special sprayed concrete material for tunnels with high ground temperature and dry heat environment. Background technique [0003] "Multiple, long, large, and deep", that is, large number, large length, large section, and large buried depth have become the development trend of tunnel engineering in my country. Deep buried long tunnels play an irreplaceable role in overcoming terrain obstacles such as mountains and valleys, shortening spatial distances, and improving the operation quality of land transportation projects. With the advancement of design theory and construction technology, more deep-buried long tunnels will be built in fields such as railways, highways, hydropower, inter-basin water diversion, and mineral resources, and the accompanying problem of high ground temperature has become increasingly prominent. High ground temperature in tunn...

Claims

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Application Information

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IPC IPC(8): C04B28/06
CPCC04B28/06C04B2111/00008C04B2111/00155C04B2201/50C04B7/02C04B14/06C04B14/48C04B2103/302C04B2103/0068C04B2103/12C04B14/068C04B18/12
Inventor 崔圣爱刘品许雪峰符飞郭晨李固华李福海
Owner SOUTHWEST JIAOTONG UNIV
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