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Low-water-absorption regenerated GRC material prepared from high-belite sulphoaluminate cement

A special sulfur aluminate, low water absorption technology, applied in the field of building materials, can solve the problems of increasing the water absorption rate of recycled GRC, unfavorable durability of GRC, poor crushing index, etc., to accelerate the hydration of Belite and speed up The effect of high template turnover and high strength

Inactive Publication Date: 2020-08-18
国检测试控股集团北京有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regenerated GRC is different from traditional GRC in that the natural aggregate, quartz sand, is replaced by recycled aggregate from construction waste. A large amount of recycled aggregate contains a large number of pores and microcracks, which not only has poor crushing index, but also has a high water absorption rate, up to 8 % or more, the use of recycled aggregate with high water absorption rate to replace low water absorption rate quartz sand will further increase the water absorption rate of recycled GRC, which is very unfavorable to the durability of GRC

Method used

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  • Low-water-absorption regenerated GRC material prepared from high-belite sulphoaluminate cement

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Experimental program
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Embodiment 1

[0032] A low water absorption recycled GRC material prepared from high belite sulfoaluminate cement, comprising components in the following weight ratios: high belite sulfoaluminate cement: quartz sand: waste concrete recycled aggregate: water: reduced The weight ratio of water agent: coagulant: emulsion: defoamer: silicone: alkali-resistant glass fiber is 38.72: 15.49: 23.23: 11.08: 0.94: 0.77: 4.65: 0.04: 0.05: 5.03; among which:

[0033] The high belite sulfoaluminate cement is grade 42.5 anti-cracking double-fast high belite sulfoaluminate cement, anhydrous calcium sulfoaluminate C 4 A 3 S: 37.43%, Belit C 2 S: 39.85%;

[0034] Described quartz sand is the particle that natural quartz stone is crushed and processed, and the main mineral component is SiO 2 , the particle size is 0.01mm~2.0mm, continuous gradation;

[0035] The waste concrete recycled aggregate is the granules of waste concrete produced by the demolition of existing buildings after crushing and processin...

Embodiment 2

[0048] A low water absorption recycled GRC material prepared from high belite sulfoaluminate cement, comprising components in the following weight ratios: high belite sulfoaluminate cement: quartz sand: waste concrete recycled aggregate: water: reduced The weight ratio of water agent: coagulant: emulsion: defoamer: silicone: alkali-resistant glass fiber is 39.22: 7.84: 31.38: 11.23: 0.91: 0.24: 4.71: 0.04: 0.05: 4.40; among which:

[0049] The high belite sulfoaluminate cement is grade 42.5 anti-cracking double-fast high belite sulfoaluminate cement, anhydrous calcium sulfoaluminate C 4 A 3 S: 35.27%, Belit C 2 S: 42.26%;

[0050] Described quartz sand is the particle that natural quartz stone is crushed and processed, and the main mineral component is SiO 2 , the particle size is 0.01mm~1.0mm, continuous gradation;

[0051] The waste concrete recycled aggregate is the granules of waste concrete produced by the demolition of existing buildings after crushing and processing...

Embodiment 3

[0064] A low water absorption recycled GRC material prepared from high belite sulfoaluminate cement, comprising components in the following weight ratios: high belite sulfoaluminate cement: quartz sand: waste concrete recycled aggregate: water: reduced The weight ratio of water agent: coagulant: emulsion: defoamer: silicone: alkali-resistant glass fiber is 38.16: 15.26: 22.90: 10.92: 0.99: 0.23: 6.87: 0.04: 0.05: 4.58; among which:

[0065] The high belite sulfoaluminate cement is grade 42.5 anti-cracking double-fast high belite sulfoaluminate cement, anhydrous calcium sulfoaluminate C 4 A 3 S: 34.94%, Belit C 2 S: 41.55%;

[0066] Described quartz sand is the particle that natural quartz stone is crushed and processed, and the main mineral component is SiO 2 , the particle size is 0.01mm~1.5mm, continuous gradation;

[0067] The recycled aggregate of waste concrete is the granules of waste concrete produced by the demolition of existing buildings after crushing and proces...

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Abstract

The invention discloses a low-water-absorption regenerated GRC material prepared from high-belite sulphoaluminate cement. The low-water-absorption regenerated GRC material is prepared, through stirring, spraying and compacting, from the following components in parts by weight: 30 to 50 parts of high-belite sulphoaluminate cement; 5 to 20 parts of quartz sand; 20 to 50 parts of waste concrete recycled aggregate; 8 to 15 parts of water; 0.1 to 2 parts of water reducing agent; 0.1 to 1 part of thickening time control agent; 3 to 10 parts of emulsion; 0.005 to 0.1 part of defoaming agent; 0.005 to0.1 part of organic silicon; and 1 to 10 parts of alkali-resistant glass fibers. The high-belite sulphoaluminate cement with the characteristics of quick setting, quick hardening, early strength andlater strength is adopted to replace Portland cement and sulphoaluminate cement commonly used in GRC to serve as a glue material; capillary pores are filled with C-S-H gel produced through a hydrationreaction in the later period, so that water entering channels of the GRC are reduced; and a composite organic silicon water repellent further improves the compactness and hydrophobicity of a GRC matrix to reduce the water absorption rate of the regenerated GRC.

Description

technical field [0001] The invention relates to a cement-based composite material, which is a recycled glass fiber-reinforced cement material and its preparation method, in particular to a cement-based composite material with high strength, low water absorption and good carbonation resistance prepared by using high belite sulfoaluminate cement A recycled glass fiber reinforced cement material and a preparation method thereof belong to the technical field of building materials. Background technique [0002] Glass fiber reinforced cement (GRC for short), as a fiber concrete composite material, has a high water absorption rate (the water absorption rate specified in the industry standard for GRC decorative products does not exceed 14% to 16%). The aggregate commonly used in GRC is quartz sand, with a water absorption rate of about 1%. Regenerated GRC is different from traditional GRC in that the natural aggregate, quartz sand, is replaced by recycled aggregate from constructio...

Claims

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Application Information

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IPC IPC(8): C04B28/06
CPCC04B28/06C04B2201/50C04B14/06C04B14/42C04B18/167C04B22/0013C04B24/26C04B24/42C04B2103/302C04B2103/50
Inventor 张利俊秦宪明项斌峰王灵秀邱洪华蔡素燕王博李维
Owner 国检测试控股集团北京有限公司
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