Granite powder composite mineral admixture and preparation method therefor

A technology for granite rock powder and composite minerals, which is applied in the field of granite rock powder composite mineral admixture and its preparation, can solve the problems of low dosage, and achieve the effects of increasing dosage, improving workability and reducing surface energy.

Inactive Publication Date: 2016-12-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent uses granite stone powder and fly ash as admixtures, and uses the synergistic effect of the two to obtain concrete that meets the strength requirements. However, the amount of stone powder in the total cementitious material is only 17.5%, and the amount is relatively small.

Method used

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  • Granite powder composite mineral admixture and preparation method therefor
  • Granite powder composite mineral admixture and preparation method therefor
  • Granite powder composite mineral admixture and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare modified granite stone powder: take granite stone powder and composite modifier as raw materials, get the composite modifier that accounts for 1% of the quality of granite stone powder (by mass percentage by 60% alkaline activator and 40% sulfate activator Composition, wherein the basic activator is water glass, the modulus is 2.3, the sulfate activator is phosphogypsum, CaSO 4 2H 2 The content of O is 90.5%), and then the granite stone powder and the composite modifier are mixed and ground until the screening amount of the 200-mesh square hole sieve is less than 30%, so as to obtain the modified granite stone powder.

[0028] Preparation of modified fly ash: Mix fly ash and quicklime at a mass ratio of 9:1, hydrothermally treat at 100°C for 24 hours, dry and calcinate at 900°C for 1 hour, and then quench to obtain.

[0029] Preparation of granite stone powder composite mineral admixture: take by weight 40 parts of modified granite stone powder, 25 parts of mod...

Embodiment 2

[0031] A method similar to that of Example 1 was used to prepare modified granite rock powder and modified fly ash.

[0032]Preparation of granite stone powder composite mineral admixture: take 50 parts of modified granite stone powder, 25 parts of modified fly ash, and 25 parts of slag according to the mass ratio, and take a strengthening activator (same as Example 1), and the strengthening activator is added The amount accounts for 0.2% of the sum of the mass of granite stone powder, modified fly ash and slag. The above raw materials are put into a ball mill and ground until the sieve volume of a 45 μm square hole sieve is less than 10%, and the obtained under-sieve material is dried and cooled to obtain a granite stone powder composite mineral admixture. Apply the granite stone powder composite mineral admixture to the cement mortar (see Table 1 for specific proportions), replace 30% of the cement with the granite stone powder composite admixture, and check the fluidity and...

Embodiment 3

[0034] A method similar to that of Example 1 was used to prepare modified granite rock powder and modified fly ash.

[0035] Preparation of granite stone powder composite mineral admixture: weigh 66.6 parts of modified granite stone powder, 16.7 parts of modified fly ash, 16.7 parts of slag according to the mass ratio, and take a strengthening activator (same as Example 1), and the strengthening activator is added The amount accounts for 0.2% of the sum of the mass of granite stone powder, modified fly ash and slag. The above raw materials are put into a ball mill and ground until the sieve volume of a 45 μm square hole sieve is less than 10%, and the obtained under-sieve material is dried and cooled to obtain a granite stone powder composite mineral admixture. Apply the granite stone powder composite mineral admixture to the cement mortar (see Table 1 for specific proportions), replace 30% of the cement with the granite stone powder composite admixture, and check the fluidity...

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Abstract

The invention relates to a granite powder composite mineral admixture and a preparation method therefor. The admixture contains raw materials, i.e., modified granite powder, modified pulverized coal ash, slag and a reinforced activator, wherein the mass content of the former three kinds of raw materials is as follows: the mass content of the modified granite powder is 40 to 70 parts, the mass content of the modified pulverized coal ash is 10 to 25 parts, the mass content of the slag is 15 to 35 parts, the sum of mass contents of the three kinds of raw materials is 100 parts, and the mass of the reinforced activator accounts for 0.1% to 0.3% the total mass of the former three kinds of raw materials. The preparation method comprises the steps: proportionally weighing the raw materials, i.e., the modified granite powder, the modified pulverized coal ash, the slag and the reinforced activator, mixing the raw materials, then, putting the mixture into a ball mill, carrying out milling until the screening volume of a square-mesh screen with the pore size of 45 microns is lower than 10%, baking the obtained screen underflow, and carrying out cooling, thereby obtaining the granite powder composite mineral admixture. According to the scheme of the invention, the activity of the granite powder is enhanced, the utilization ratio of the granite powder is increased, and thus the economic and social benefits are very good.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and resource utilization, and relates to a granite rock powder composite mineral admixture and a preparation method thereof. Background technique [0002] As the main component of the continental crust, granite is a widely distributed and abundant rock. A large amount of granite powder will be produced in the process of machine-made sand production and stone manufacturing. Arbitrary stacking of granite powder will not only occupy valuable cultivated land resources, reduce soil quality, but also cause environmental pollution and waste of resources. [0003] At present, domestic researchers have studied the feasibility of granite stone powder as an admixture instead of cement, and solved the problems of granite stone powder pollution and resource waste by compounding with silica fume, fly ash and other mineral admixtures to replace cement. Because granite stone powder is an inert mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B28/00
CPCC04B40/0039C04B28/00C04B2201/50C04B14/048C04B18/08C04B18/141C04B24/32C04B24/122C04B24/18C04B22/002C04B14/06C04B2103/0068
Inventor 李相国尹轮刘卓霖谭洪波杨蓉明添笪俊伟
Owner WUHAN UNIV OF TECH
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