A kind of anti-corrosion and anti-rust type post-tensioning method prestressed channel pressure slurry and preparation method thereof

Abstract

The invention relates to an anti-corrosion and anti-rust type post-tensioned prestressed tunnel press slurry and a preparation method thereof. The press slurry includes cement, expansion agent, mineral powder, water reducer, retarder, rust inhibitor, and preservative , carboxymethyl cellulose, defoamer and other components, the water-to-binder ratio is 0.28, after mixing with a cement mortar mixer at a slow speed, and then at a fast speed of 1000r / min to obtain the product. The grout material provided by the invention has good slurry fluidity, no delamination, no bleeding, fullness, no shrinkage and high strength after hardening, which is beneficial to protect prestressed steel bars from corrosion and improve prestressed bridges. The service life of the structure is especially suitable for post-tensioning prestressed tunnel grouting in northwest or coastal areas, and has the function of anti-corrosion and anti-rust.

Description

technical field

[0001] The invention relates to the technical field of building materials, in particular to a post-tensioned prestressed tunnel pressure slurry and a preparation method thereof. Background technique

[0002] The recommended standard for the transportation industry of the People's Republic of China "Technical Specifications for Construction of Highway Bridges and Culverts" (JTG / T F50-2011) stipulates in the technical conditions for grouting of post-tensioned prestressed concrete beam channels: the water-binder ratio of the grouting slurry is 0.26 to 0.28; A high-speed mixer with a rotation speed of 1000 rpm is used during construction; at the same time, the fluidity of the slurry is required: initial 10-17s, 30min 10-20s, 60min 10-25s; bleeding rate 0%; pressure bleeding rate 0%; free expansion rate 0-3%; filling degree qualified; setting time: initial setting time ≥ 5h, final setting time ≤ 24h; 3d compressive strength ≥ 20MPa, 7d compressive strength ≥ 40MPa...

Examples

Embodiment 1

[0028] An anti-corrosion and anti-rust type post-tensioned prestressed tunnel pressure slurry, the formula of which is as follows:

[0029]

[0030] Its preparation method is as follows: Weigh each raw material component into a dry powder mixer and mix evenly, then move it into a cement mortar mixer, add 840g of mixing water at 20°C, stir for 1min at a slow speed, and then use a fast speed of 1000r / min. Stirring for 4 minutes, the product was discharged, and then the performance test of the grouting slurry was carried out under the ambient temperature of 20°C.

Embodiment 2

[0032] An anti-corrosion and anti-rust type post-tensioned prestressed tunnel pressure slurry, the formula of which is as follows:

[0033]

[0034]

[0035] The preparation method is as follows: Weigh each raw material component into a dry powder mixer and mix evenly, then move it into a cement mortar mixer, add 826g of mixing water at 23°C, stir for 1.5min at a slow speed, and then use a 1000r / min Stir at high speed for 4.5 minutes, discharge the product, and then carry out the performance test of the grouting slurry under the ambient temperature condition of 23°C.

Embodiment 3

[0037] An anti-corrosion and anti-rust type post-tensioned prestressed tunnel pressure slurry, the formula of which is as follows:

[0038]

[0039]

[0040] Its preparation method is as follows: Weigh each raw material component into a dry powder mixer and mix evenly, then move it into a cement mortar mixer, add 760g of stirring water at 15°C, stir for 0.5min at a slow speed, and then use a 1000r / min Stir at high speed for 3 minutes, discharge the product, and then carry out the performance test of the grouting slurry under the ambient temperature of 15°C.

technical field

[0001] The invention relates to the technical field of building materials, in particular to a post-tensioned prestressed tunnel pressure slurry and a preparation method thereof. Background technique

[0002] The recommended standard for the transportation industry of the People's Republic of China "Technical Specifications for Construction of Highway Bridges and Culverts" (JTG / T F50-2011) stipulates in the technical conditions for grouting of post-tensioned prestressed concrete beam channels: the water-binder ratio of the grouting slurry is 0.26 to 0.28; A high-speed mixer with a rotation speed of 1000 rpm is used during construction; at the same time, the fluidity of the slurry is required: initial 10-17s, 30min 10-20s, 60min 10-25s; bleeding rate 0%; pressure bleeding rate 0%; free expansion rate 0-3%; filling degree qualified; setting time: initial setting time ≥ 5h, final setting time ≤ 24h; 3d compressive strength ≥ 20MPa, 7d compressive strength ≥ 40MPa...

Examples

Embodiment 1

[0028] An anti-corrosion and anti-rust type post-tensioned prestressed tunnel pressure slurry, the formula of which is as follows:

[0029]

[0030] Its preparation method is as follows: Weigh each raw material component into a dry powder mixer and mix evenly, then move it into a cement mortar mixer, add 840g of mixing water at 20°C, stir for 1min at a slow speed, and then use a fast speed of 1000r / min. Stirring for 4 minutes, the product was discharged, and then the performance test of the grouting slurry was carried out under the ambient temperature of 20°C.

Embodiment 2

[0032] An anti-corrosion and anti-rust type post-tensioned prestressed tunnel pressure slurry, the formula of which is as follows:

[0033]

[0034]

[0035] The preparation method is as follows: Weigh each raw material component into a dry powder mixer and mix evenly, then move it into a cement mortar mixer, add 826g of mixing water at 23°C, stir for 1.5min at a slow speed, and then use a 1000r / min Stir at high speed for 4.5 minutes, discharge the product, and then carry out the performance test of the grouting slurry under the ambient temperature condition of 23°C.

Embodiment 3

[0037] An anti-corrosion and anti-rust type post-tensioned prestressed tunnel pressure slurry, the formula of which is as follows:

[0038]

[0039]

[0040] Its preparation method is as follows: Weigh each raw material component into a dry powder mixer and mix evenly, then move it into a cement mortar mixer, add 760g of stirring water at 15°C, stir for 0.5min at a slow speed, and then use a 1000r / min Stir at high speed for 3 minutes, discharge the product, and then carry out the performance test of the grouting slurry under the ambient temperature of 15°C.

Images