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Phosphogypsum-doped quick-setting and quick-hardening cement matrix, concrete canvas prepared from cement matrix and construction method of concrete canvas

A technology for concrete canvas and fast-hardening cement, which is applied in chemical instruments and methods, textiles and papermaking, film/sheet-like adhesives, etc. Stability qualified effect

Active Publication Date: 2019-12-17
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only about 20% of the phosphogypsum is used, and most of the phosphogypsum is still piled up, seriously affecting the surrounding environment and groundwater resources.

Method used

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  • Phosphogypsum-doped quick-setting and quick-hardening cement matrix, concrete canvas prepared from cement matrix and construction method of concrete canvas
  • Phosphogypsum-doped quick-setting and quick-hardening cement matrix, concrete canvas prepared from cement matrix and construction method of concrete canvas
  • Phosphogypsum-doped quick-setting and quick-hardening cement matrix, concrete canvas prepared from cement matrix and construction method of concrete canvas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The raw material is sulfoaluminate cement (CSA82.5) with a component of 700, and the phosphogypsum powder with a component of 300 is acid-washed, dried and ball-milled for 15 minutes. The upper layer of the three-dimensional spacer fabric is composed of polyester and carbon fiber, and the lower layer is composed of It is polyester fiber, the middle yarn is nylon, and the thickness is 10mm. Referring to the standard consistency test method in the "Cement Standard Consistency Water Consumption, Setting Time, and Stability Test Method" (GB / T 1346-2011), the water-cement ratio was determined to be 0.33. Prepare a triple test block of 40mm×40mm×160mm, place the formed test piece in a standard curing box with a relative humidity of not less than 90% and a temperature of (20±1)°C, and measure the flexural and compressive strength of the corresponding age value.

[0051] The test results show that the flexural strength reaches 10MPa in 1d and 13MPa in 7d; the compressive stren...

Embodiment 2

[0071] The raw materials are selected as sulphoaluminate cement (CSA82.5) and pickled phosphogypsum. Referring to the standard consistency test method in the "Cement Standard Consistency Water Consumption, Setting Time, and Stability Test Method" (GB / T 1346-2011), the water-cement ratio was determined to be 0.33. Prepare a triple test block of 40mm×40mm×160mm, place the formed test piece in a standard curing box with a relative humidity of not less than 90% and a temperature of (20±1)°C, and measure the volume stability (Table 2), condensation Time (Table 3), expansion rate ( image 3 ), the flexural compressive strength is higher than the corresponding age (Table 4).

[0072] Table 2 volume stability measurement results

[0073]

[0074] Table 3 coagulation time measurement results

[0075] Specimen type Phosphogypsum - 0% Phosphogypsum - 10% Phosphogypsum - 20% Phosphogypsum - 30% Phosphogypsum - 40% Initial setting time / min 158 26 36 42 6...

Embodiment 3

[0087] The method for making pickled phosphogypsum is to pickle once with citric acid aqueous solution, then add quicklime to wash until the upper layer has no suspended oily matter, and finally place the cleaned phosphogypsum in an oven for drying and ball milling for 10-17 minutes to obtain pickled phosphogypsum. plaster.

[0088] The ball milling conditions are as follows: the diameter of the zirconia balls is 3.5×10mm, the filling amount is 60%, the ball milling speed is 16.8r / min, and the ball milling time is changed. Among them, the particle size after ball milling for 5min, 10min, 13min and 15min, the initial and final setting time and 7d expansion rate at 30% phosphorus-doped gypsum are shown in Table 5.

[0089] table 5

[0090] Ball milling time / min 5 10 13 15 Particle size / um 600-900 300-600 400-550 100-300 Initial setting time / min 60 56 40 42 Final setting time / min 62 61 43 45 7d Expansion rate / 100% 0.0195 0.0198 0....

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Abstract

The invention relates to a phosphogypsum-doped quick-setting and quick-hardening cement matrix, concrete canvas prepared from the cement matrix and a construction method of the concrete canvas. The raw materials of the cement matrix are composed of the following components in parts by weight: 700 to 800 parts of sulphoaluminate cement and 200 to 300 parts of acid-pickled phosphogypsum. A three-dimensional spacer fabric is filled with the phosphogypsum-doped quick-setting and quick-hardening cement matrix, and an adhesive sealing layer is arranged above the three-dimensional spacer fabric; thethree-dimensional spacer fabric comprises an upper woven fabric layer, a cellosilk layer and a lower woven fabric layer, and the cellosilk layer is composed of cellosilk distributed in a three-dimensional mode. The invention provides the novel cement matrix for the concrete canvas, the strength can be remarkably improved by doping phosphogypsum into the cement matrix system, so that excellent performance is obtained, and a feasible solving method can be provided for solving the current phosphogypsum problem by doping phosphogypsum.

Description

technical field [0001] The invention relates to the field of preparation of concrete canvas materials, in particular to a phosphorus-doped gypsum fast-setting rapid-hardening cement matrix and the concrete canvas produced therefrom and a construction method. Background technique [0002] Because of its high compressive strength, rich raw materials, low production price and simple production process, concrete can maintain good working performance for a long time, and can be made into different types of concrete for engineering according to requirements. With the development of the times, the use of concrete is increasing, and concrete structures have been applied in construction engineering, road engineering, bridge engineering, hydropower engineering and other fields. However, concrete itself has a major disadvantage of low tensile properties, which limits the application of concrete in wider fields. Composite materials prepared with three-dimensional spacer fabrics as rein...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/30C04B11/26D06M11/56C09J7/21B32B9/00B32B9/04B32B27/02B32B27/12B32B27/34B32B27/36B32B5/02B32B33/00B32B37/10B32B37/00D06M101/32D06M101/34
CPCC04B11/30C04B11/26C04B11/005D06M11/56C09J7/21B32B5/02B32B5/026B32B5/08B32B5/26B32B33/00B32B37/0038B32B37/10D06M2101/32D06M2101/34C09J2475/00C09J2400/263B32B2250/20B32B2260/021B32B2260/044B32B2260/046B32B2262/0261B32B2262/0276B32B2262/106B32B2262/14B32B2307/558B32B2307/3065B32B2307/7265B32B2307/7145
Inventor 徐港田雯雯王青张榆陈少坤
Owner CHINA THREE GORGES UNIV
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