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Granule curing agent and high-strength low-shrinkage cracking-resistance road surface base layer material prepared using same

A technology of curing agent and pellets, applied in the direction of cement production, etc., can solve the problems of insufficient mechanical properties and durability, and achieve the effect of increasing strength, increasing strength and reducing plastic index

Active Publication Date: 2019-04-16
WUHAN MUNICIPAL CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to address the deficiencies of the prior art, to provide a granular solidifying agent and a high-strength, low-shrinkage, anti-crack pavement base material prepared by using it. The obtained pavement base material has high strength, excellent water resistance stability, shrinkage Small and other characteristics, and the preparation method involved is simple, and has wide applicability to soil. It can effectively solve the problems of insufficient mechanical properties and durability of stabilized soil materials caused by the solidified soil exceeding the normal particle size, and can realize resource utilization of construction waste, etc. , with important economic and environmental benefits

Method used

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  • Granule curing agent and high-strength low-shrinkage cracking-resistance road surface base layer material prepared using same
  • Granule curing agent and high-strength low-shrinkage cracking-resistance road surface base layer material prepared using same
  • Granule curing agent and high-strength low-shrinkage cracking-resistance road surface base layer material prepared using same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] In the following examples, the low-Ca micro-expansion cement used has a density of 3200kg / m 3 , specific surface area 324m 2 / kg, the average particle size is 12.5 μm, and the specific preparation method comprises the following steps:

[0055] 1) With coal gangue, paper sludge, ash, CaO, MgO and BaCO 3 As the main raw material, each raw material is weighed according to the proportion, and the ball mill is mixed evenly to obtain the raw meal. The raw materials and their mass percentages include: coal gangue 64%, paper sludge 12%, ash 3%, analytically pure CaO 20 %, Analytical pure MgO 1.0%;

[0056] 2) adding water of 3% of the mass of the raw meal to the mixed material obtained in step 1) ball milling, continuing to mix evenly, and then pressing to obtain a raw meal tablet;

[0057] 3) Heat the obtained raw material pressed tablet to 1300°C and keep it warm for 40 minutes, then take it out and quench it in the air, and then grind it down to less than 0.075mm to obtai...

Embodiment 1

[0070] A granular solidifying agent and a high-strength, low-shrinkage anti-crack pavement base material prepared by using the same, the preparation process includes the following steps:

[0071] Granular curing agent

[0072] 1) Use low-Ca micro-expansion cement, alkaline catalyst, waste steel slag, high-Ca fly ash, expansion agent, composite fiber and internal curing agent as raw materials, and weigh each raw material according to the proportioning conditions described in Table 1-1;

[0073] 2) Use low-Ca micro-expansion cement, alkaline catalyst, fresh waste steel slag, high-Ca fly ash, expansion agent and fiber as material A, mix the components and grind them until the Blaine specific surface area is 650m 2 / kg; the internal curing agent is pre-wetted for material B;

[0074] High-strength and low-shrinkage anti-crack pavement base material

[0075] 1) With silty clay, granular solidifying agent and construction waste as raw materials, each raw material is weighed accord...

Embodiment 2-4

[0094] The preparation process of the granular solidifying agent and the high-strength low-shrinkage anti-crack pavement base material described in Example 2-4 is roughly the same as that of Example 1, except that the formulas used are specifically shown in Tables 2-1 and 2-2; See Table 2-3 for the test block strength test results of the high-strength and low-shrinkage anti-crack pavement base material, see Table 2-4 for the water stability test results, and see Table 2-5 for the crack resistance test results.

[0095] Table 2-1 Composition of granular curing agent / %

[0096]

[0097] Table 2-2 Composition and dosage of each raw material in pavement base material / %

[0098]

[0099] Table 2-3 Strength of pavement base material

[0100]

[0101] Table 2-4 Water Stability Coefficient of Stabilized Soil with Shrinkage Reinforcement Materials

[0102]

[0103] Table 2-5 Variation of drying shrinkage characteristics of stabilized soil with age

[0104]

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Abstract

The invention discloses a granule curing agent and a high-strength low-shrinkage cracking-resistance road surface base layer material prepared using the same. The curing agent is a powder reagent which is prepared by taking low Ca micro-expansive cement, an alkaline catalyst, waste steel slags, high Ca powder coal ash, an expanding agent, an internal curing agent and composite fibers. The curing agent aims at solving the difficult problem of insufficient stable soil material mechanical performance and durability when curing soil exceeds a normal particular dimension; the high-strength low-shrinkage cracking-resistance road surface base layer material prepared using the granule curing agent has the advantages of excellent mechanical performance, stable water resistance and cracking resistance, durability and excellent energy-saving environmental-friendly characteristics, the cost of an engineering project can be effectively reduced, the material can be generally applied to the fields ofroad base layers, soft base treatment, ecological slope protection, dam anti-seepage walls, filling materials, building foundation treatment and the like, and the material has wide application prospects.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a granular curing agent and a high-strength, low-shrinkage, anti-crack pavement base material prepared by using the same. Background technique [0002] The pavement base layer is the load-bearing layer of the entire road, which plays a role in stabilizing the pavement, and its material and quality directly affect the quality and performance of the pavement. Cement is the most important cementing phase in traditional cement-stabilized soil. Cement hydration is difficult to directly cement soil particles and construction waste at room temperature. It has problems such as low strength, poor water stability, large shrinkage, and easy cracking when applied to pavement bases. The main reasons are as follows: ①The soil particle size distribution is uneven and the particle size is too large; ②The cementitious material is not fully hydrated, easy to shrink and crack; ③The con...

Claims

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Application Information

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IPC IPC(8): C04B28/02C04B7/24C04B111/34
CPCC04B7/24C04B28/02C04B2111/0075C04B2111/343C04B2201/50C04B12/04C04B22/10C04B18/142C04B18/08C04B22/148C04B22/064C04B22/066C04B18/24C04B18/0409C04B24/2641C04B16/0683C04B16/0633C04B16/0641C04B14/10C04B18/16Y02P40/10
Inventor 何勇张勇郭云鹏丁庆军李进辉刘小锋程敏喻妍叶强苗强卢吉
Owner WUHAN MUNICIPAL CONSTR GROUP
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