Red mud-based material for roadbed water-stable layer and preparation method of red mud-based material
A technology for water stabilization layer and base material, applied in the field of building materials, can solve the problems of poor coagulation, heavy metal dissolution with large performance fluctuation of roadbed materials, etc., to achieve the effect of improving strength, enhancing mechanical properties, and meeting performance requirements
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[0045] In a second aspect, the present invention provides a method for preparing a red mud-based material for a roadbed water stabilization layer, comprising:
[0046] Step 1: Pretreatment of red mud, that is, carbonation;
[0047] Step 2: Synergistically thermally activate the pretreated red mud and solid waste gypsum, and then add slag;
[0048] Step 3: Add activator, heavy metal curing agent and water retaining agent;
[0049] Step 4: Stir various raw materials in proportion to make a slurry, and then cure and solidify.
[0050] The specific conditions of the carbonation are: the humidity is 20%-80%, the temperature is 50-100°C, CO 2 The pressure intensity is 1-2.5MPa, and the time is 120-180min, preferably 180min. The purpose of carbonation is to reduce the alkalinity of the red mud itself and improve the activity.
[0051] The synergistic thermal activation temperature of red mud and solid waste gypsum is 400-900°C and the time is 60-90min. Under this condition, the s...
Embodiment 1
[0065] 1) Take 80 parts of Bayer red mud, pretreat and carry out carbonation treatment, the humidity is 40%, the temperature is 100°C, CO 2 The pressure intensity is 1MPa, and the time is 180min;
[0066] 2) Take 10 parts of slag and 20 parts of desulfurized gypsum;
[0067] 3) Synergistically thermally activate the pretreated red mud and desulfurized gypsum at a temperature of 600°C for 60 minutes, and add slag;
[0068] 4) Take 3 parts of phosphate, 6 parts of water glass 1.8M, and 8 parts of polyacrylamide, in parts by mass;
[0069] 5) Mix and stir various raw materials, and stir for 10 minutes.
[0070] Table 1. Performance characterization of the red mud-based material of the roadbed water stabilization layer in Example 1
[0071]
[0072]
[0073] The experimental data show that with the extension of time, the pH value of the red mud-based material used for the roadbed water stabilization layer has risen to a certain extent, but it is significantly lower than t...
Embodiment 2
[0075] 1) Take 85 parts of Bayer red mud, pretreat and carry out carbonation treatment, the humidity is 50%, the temperature is 80°C, CO 2 The pressure intensity is 1.5MPa, and the time is 180min;
[0076] 2) Take 15 parts of slag and 20 parts of desulfurized gypsum;
[0077] 3) Synergistically thermally activate the pretreated red mud and desulfurized gypsum at a temperature of 700°C for 60 minutes, and add slag;
[0078] 4) Take 4 parts of limestone, 8 parts of water glass 2.0M, 6 parts of starch grafted acrylate, in parts by mass;
[0079] 5) Mix and stir various raw materials, and stir for 10 minutes.
[0080] Table 2. Performance characterization of the red mud-based material of the roadbed water stabilization layer in Example 2
[0081] 3d 7d 28d PH value 9.10 9.34 10.02 Compressive strength / MPa 5.01 9.67 38.9 Deflection value / 0.01mm 21.5 22.3 23.4
[0082] The experimental data shows that, compared with Example 1, the initial ...
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