A kind of magnesium oxide retarder based on multivitamin, composite magnesium oxide and application

A technology of complex vitamins and magnesium oxide, which is applied in the field of cement-based material admixtures, can solve the problems of magnesium oxide hydration ineffectiveness, and achieve the effects of reducing the hydration rate, slowing down the hydration rate, and reducing the formation of cracks

Active Publication Date: 2020-02-18
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used retarders mainly include lignosulfonates and their derivatives, cellulose derivatives, hydroxycarboxylic acids and their salts, and inorganics according to their structures. Some retarders have a retarding effect on cement. But does not work for hydration of magnesium oxide

Method used

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  • A kind of magnesium oxide retarder based on multivitamin, composite magnesium oxide and application
  • A kind of magnesium oxide retarder based on multivitamin, composite magnesium oxide and application

Examples

Experimental program
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preparation example Construction

[0027] 2.1 Preparation method of retarder

[0028] vitamin C, vitamin B 1 , Vitamin B 2 and vitamin B 6 Crush and grind into powder, weigh the powder according to the proportion, and mix evenly to obtain the required magnesium oxide retarder.

Embodiment 1

[0029] Example 1: According to the method in part 2.1, the vitamin tablets are crushed and ground into powder, and in parts by weight, 40 parts of vitamin C and 20 parts of vitamin B 1 , 20 servings of vitamin B 2 , 20 servings of vitamin B 6 , mixed evenly to obtain retarder.

[0030] Take 0.1% magnesia mass retarder and dissolve it in water, add magnesia and mix to make standard test piece 1, measure the setting time, and record it in Table 1.

Embodiment 2

[0031] Example 2: According to the method in part 2.1, the vitamin tablets are crushed and ground into powder, and by weight, 55 parts of vitamin C and 15 parts of vitamin B 1 , 15 servings of vitamin B 2 , 15 servings of vitamin B 6 , mixed evenly to obtain retarder.

[0032] Take 0.1% magnesia mass retarder and dissolve it in water, add magnesia and mix to make standard test piece 2, measure the setting time, and record it in Table 1.

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Abstract

The invention discloses a light calcined magnesium oxide retarder based on composite vitamins, the light calcined magnesium oxide retarder comprises the following components in parts by weight: 40-70parts of vitamin c, 10-20 parts of vitamin b1, 10-20 parts of vitamin b2 and 10-20 parts of vitamin b6, the light calcined magnesium oxide retarder is prepared by the following steps: 1) grinding vitamin tablets into powder; and 2) uniformly mixing the powder at normal temperature according to the proportion to obtain the required magnesium oxide retarder. The vitamin magnesium oxide retarder provided by the invention provides a new idea from a biological drug angle for preparation of a cement-based material additive, the preparation process is simple, safe and non-toxic, and the initial and final setting time can be remarkably prolonged.

Description

technical field [0001] The invention belongs to the technical field of cement-based material admixtures, in particular to a composite vitamin-based magnesium oxide retarder, composite magnesium oxide and applications thereof. Background technique [0002] The scientific name of light-burned magnesia is magnesia, commonly known as magnesite, which is obtained by calcining magnesite at 700-1000°C. After hydration, the volume will expand significantly. In bulk cement-based materials, there is a temperature drop process in the later stage of cement hydration exothermic, resulting in shrinkage cracks. Incorporating magnesium oxide can effectively compensate for shrinkage due to temperature drop and cause micro-expansion of the entire system. Light-burned magnesia has a large specific surface area and fast reaction speed, which can get rid of the disadvantages of low activity and slow reaction of dead-burned magnesia, and is an ideal material to compensate for cement shrinkage. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B28/10C04B103/22
Inventor 蒋林华陈磊杨国辉靳卫准徐鹏陈晨徐怡
Owner HOHAI UNIV
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