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Quick-hardening cement prepared from waste residues and preparation method thereof

A rapid hardening cement and waste slag technology, which is applied in the field of rapid hardening cement and its preparation, can solve the problems of high maintenance requirements, repair failure, and inability to solve the surface disease of cement concrete structures, so as to alleviate the large and concentrated heat release and accelerate hydration The effect of gentle reaction process and hydration exothermic phenomenon

Active Publication Date: 2020-04-24
HANGZHOU ROADMENDER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These repair materials mainly have shortcomings: ①The bonding strength is low, which cannot solve the problem of cement concrete structure surface disease, and is not suitable for thin-layer repair materials; ②The maintenance requirements are high, and cracks are easy to occur, and even the repair will fail; ③The late strength is weak. The shrinkage phenomenon, especially the flexural strength, is also caused by cracks inside; ④The surface is easy to powder, and the wear resistance is poor; ⑤Under low temperature environment, the hourly strength is low, which cannot meet the requirements of rapid and open traffic
[0004] Magnesium phosphate cement has the advantages of fast setting and hardening, high hourly strength, high bond strength with cement concrete, and good wear resistance. However, phosphate cement has a large heat of hydration and concentrated heat release; poor water resistance, when soaked in water for a long time, The strength may even shrink; the unreacted free magnesium oxide particles slowly undergo hydration reaction in a humid environment, and the local volume expands, which may cause phosphate cement to swell and crack, so there are hidden dangers in stability

Method used

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  • Quick-hardening cement prepared from waste residues and preparation method thereof
  • Quick-hardening cement prepared from waste residues and preparation method thereof
  • Quick-hardening cement prepared from waste residues and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]

[0037] Waste magnesia bricks are made by mixing sintered magnesia bricks and chemically bonded magnesia bricks in a ratio of 1:1, and the mineral admixture is made by mixing fly ash and silica fume in a ratio of 1:1.

[0038] The instant cement is prepared through the following steps: borax is pulverized into powder by a pulverizer; waste magnesia bricks are crushed and ground to a fineness of less than 180 meshes, and 0.2% to 0.8% The organic silane is used as a grinding aid; the raw materials of each component are weighed according to the weight ratio, poured into a mixer and mixed for 20 to 30 minutes to obtain the product of the present invention.

[0039] Mix the prepared rapid-hardening cement with water and sand according to the following ratio to prepare mortar evenly. Rapid-hardening cement:water:sand=1:0.16:1 (mass ratio). The performance test results are shown in Table 1.

Embodiment 2

[0041] A kind of rapid hardening cement that utilizes waste slag preparation, the proportioning by weight percentage is as follows:

[0042]

[0043] Waste magnesia bricks are made by mixing chemically bonded magnesia bricks and magnesia-alumina bricks at a ratio of 2:1, and the mineral admixture is made of fly ash and silica fume at a ratio of 2:1. Prepare the patent of the present invention by the step of embodiment 1.

[0044] Mix the prepared rapid-hardening cement with water and sand according to the following ratio to prepare mortar evenly. Rapid-hardening cement:water:sand=1:0.12:1 (mass ratio). The performance test results are shown in Table 1.

Embodiment 3

[0046] A kind of rapid hardening cement that utilizes waste slag preparation, the proportioning by weight percentage is as follows:

[0047]

[0048] Waste magnesia bricks are made by mixing sintered magnesia bricks and magnesia-carbon bricks in a ratio of 2:1, and the mineral admixture is made by mixing fly ash and mineral powder in a ratio of 1:1. Prepare the patent of the present invention by the step of embodiment 1.

[0049] Mix the prepared rapid-hardening cement with water and sand according to the following ratio to prepare mortar evenly. Rapid-hardening cement:water:sand=1:0.11:1 (mass ratio). The performance test results are shown in Table 1.

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Abstract

The invention relates to quick-hardening cement prepared from waste residues and a preparation method thereof. The quick-hardening cement is prepared from waste magnesia bricks, waste gypsum, ammoniumdihydrogen phosphate, borax and a mineral admixture according to a certain weight ratio. The quick-hardening cement has the advantages that the setting time is easier to regulate and control, the strength is high, the folding-pressing ratio is large, the binding power is high, and the water resistance and the stability are good.

Description

technical field [0001] The invention relates to a quick-hardening cement prepared by using waste residue and a preparation method thereof, belonging to the field of quick-fixing materials. Background technique [0002] With the rapid development of my country's economy and society, traffic engineering has shifted from infrastructure construction to both construction and maintenance. During the service process of cement concrete structures such as airport runways, highway bridges and municipal engineering, due to the repeated action of load and the periodic influence of the surrounding environment, damage will inevitably occur. If effective repair measures are not taken in time, the degree of damage will continue. The deterioration rate of cement concrete structure will increase rapidly. Therefore, the repair work of cement concrete pavement has gradually become the focus and difficulty of the transportation industry. The performance of repair materials is the key factor affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/02C04B9/20C04B9/11
CPCC04B9/11C04B9/20C04B12/027
Inventor 陈勇孙娜峰吴方政
Owner HANGZHOU ROADMENDER TECH CO LTD
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