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Low-shrinkage green UHPC (ultrahigh performance concrete) and preparation method thereof

A low-shrinkage, green technology, applied in the field of building materials, can solve problems such as structural durability problems, achieve the effects of reducing drying shrinkage, reducing engineering costs, and improving the ability to resist shrinkage and cracking at an early stage

Active Publication Date: 2018-09-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the fine particle size, small fineness modulus, and smooth surface morphology of the aeolian sand, there are often shrinkage problems, and shrinkage cracks will lead to structural durability problems

Method used

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  • Low-shrinkage green UHPC (ultrahigh performance concrete) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of low-shrinkage green UHPC, by parts by weight, comprises the following components:

[0043] 720 parts of ordinary portland cement, 360 parts of superfine fly ash, 120 parts of silica fume, 4.8 parts of superabsorbent resin (SAP), 960 parts of aeolian sand, 239 parts of steel fiber, 60 parts of polycarboxylate superplasticizer , 180 parts of water.

[0044] Preparation:

[0045] (1) Weighing of powder, weigh cement, superfine fly ash, silica fume, SAP in proportion, put it in a standard cement mortar planetary mixer for dry mixing, stir at a slow speed for 2 minutes, and mix evenly to obtain mixed gelation Material;

[0046] (2) Add the aeolian sand evenly into the above-mentioned mixed material, and stir at a slow speed for 1 minute to obtain a homogeneous material;

[0047] (3) Add the uniformly stirred water and water reducing agent mixed solution to the above mixture to obtain a uniform mixed slurry. After stirring at a slow speed for 2 minutes, the effec...

Embodiment 2

[0050] A kind of low-shrinkage green UHPC, by parts by weight, comprises the following components:

[0051] 720 parts of ordinary portland cement, 360 parts of superfine fly ash, 120 parts of silica fume, 4.8 parts of super absorbent resin (SAP), 960 parts of aeolian sand, 239 parts of steel fiber, 60 parts of polycarboxylate superplasticizer , 192 parts of water.

[0052] Preparation:

[0053](1) Weighing of powder, weigh cement, superfine fly ash, silica fume, SAP in proportion, put it in a standard cement mortar planetary mixer for dry mixing, stir at a slow speed for 2 minutes, and mix evenly to obtain mixed gelation Material;

[0054] (2) Add the aeolian sand evenly into the above-mentioned mixed material, and stir at a slow speed for 1 minute to obtain a homogeneous material;

[0055] (3) Add the uniformly stirred water and water reducing agent mixed solution to the above mixture to obtain a uniform mixed slurry. After stirring at a slow speed for 2 minutes, the effec...

Embodiment 3

[0058] A kind of low-shrinkage green UHPC, by parts by weight, comprises the following components:

[0059] 720 parts of ordinary portland cement, 360 parts of superfine fly ash, 120 parts of silica fume, 6 parts of superabsorbent resin (SAP), 960 parts of aeolian sand, 239 parts of steel fiber, 60 parts of polycarboxylate superplasticizer , 192 parts of water.

[0060] Preparation:

[0061] (1) Weighing of powder, weigh cement, superfine fly ash, silica fume, SAP in proportion, put it in a standard cement mortar planetary mixer for dry mixing, stir at a slow speed for 2 minutes, and mix evenly to obtain mixed gelation Material;

[0062] (2) Add the aeolian sand evenly into the above-mentioned mixed material, and stir at a slow speed for 1 minute to obtain a homogeneous material;

[0063] (3) Add the uniformly stirred water and water reducing agent mixed solution to the above mixture to obtain a uniform mixed slurry. After stirring at a slow speed for 2 minutes, the effect ...

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Abstract

The invention discloses a low-shrinkage green UHPC and a preparation method thereof. The low-shrinkage green UHPC is mainly prepared from the following raw materials including, by weight part, 700-750parts of ordinary Portland cement, 340-380 parts of ultrafine coal ash, 100-150 parts of silica dust, 4-8 parts of super absorbent polymer (SAP), 940-980 parts of Aeolian sand, 230-250 parts of steelfiber, 56-64 parts of polycarboxylate water-reducer and 180-200 parts of water. By the nature of ultralow porosity, UHPC can result in high shrinkage during hydration and hardening. According to thelow-shrinkage green UHPC, the Aeolian sand serves a UHPC fine aggregate; for reducing shrinkage, the SAP is doped during preparation. Results show that, with the SAP mixed, the low-shrinkage green UHPC is of little change in mechanical performance but reduces 56d drying shrinkage, thereby having a broad application prospect.

Description

technical field [0001] The invention relates to a low-shrinkage green UHPC and a preparation method thereof, belonging to the field of building materials. Background technique [0002] With the rapid development of various super high-rise and long-span structures, traditional concrete has been unable to meet the needs of complex projects due to its shortcomings such as high brittleness and easy cracking, so various new building materials have emerged as the times require. Compared with traditional concrete, ultra-high performance concrete (UHPC) has many advantages, such as a compressive strength higher than 150MPa and excellent toughness and fracture energy, so it has a good application prospect. Although UHPC has outstanding advantages, some defects are still unavoidable. Because the content of cementitious material in the mix ratio is very high and generally does not contain coarse aggregate, the porosity is extremely low, so the drying shrinkage value is often large. Su...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/06C04B111/34
CPCC04B14/068C04B28/04C04B2111/343C04B2111/346C04B2201/50C04B18/08C04B18/146C04B2103/0051C04B14/48C04B2103/302C04B22/002
Inventor 蒋金洋冯滔滔王凤娟周文静武胜萍
Owner SOUTHEAST UNIV
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