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A kind of grapefruit peel extract magnesium oxide retarder, preparation method and application

A technology of liquid magnesium oxide and pomelo peel, which is applied in the field of cement-based material admixtures, can solve the problems of magnesium oxide hydration and other problems, and achieve the effects of low price, easy acquisition, and simple preparation process

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 it has no effect on magnesium oxide hydration

Method used

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  • A kind of grapefruit peel extract magnesium oxide retarder, preparation method and application
  • A kind of grapefruit peel extract magnesium oxide retarder, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Clean the pomelo peel, cut off part of the white flesh (mesocarp), so that the mass ratio of mesocarp and exocarp is 1:1, chop the processed pomelo peel and put it into alcohol with 3 times the quality Soak, extract at 25°C for 24 hours, and then filter to obtain a 100% concentrated magnesium oxide retarder. Add the retarder to water and magnesium oxide in an amount of 1% by mass of magnesium oxide, stir evenly, and make a standard test piece 1, measure the initial setting time and final setting time, and record the data in Table 1.

Embodiment 2

[0024] Example 2: Clean the pomelo peel, cut off part of the white flesh (mesocarp), so that the mass ratio of mesocarp and exocarp is 1:1, chop the processed pomelo peel and put it into alcohol with 3 times the quality Soak and extract at 25°C for 24 hours, then filter to obtain the extract, heat and concentrate at 50°C to 1 / 2 of the original volume, and obtain a magnesium oxide retarder with a concentration of 200%. Add the retarder to water and magnesium oxide in an amount of 1% by mass of magnesium oxide, stir evenly, and make a standard test piece 2, measure the initial setting time and final setting time, and record the data in Table 1.

Embodiment 3

[0025] Example 3: Clean the pomelo peel, cut off part of the white flesh (mesocarp), so that the mass ratio of mesocarp and exocarp is 1:1, chop the processed pomelo peel and put it into alcohol with 3 times the quality Soak and extract at 25°C for 24 hours, then filter to obtain the extract, heat and concentrate at 50°C to 1 / 2 of the original volume, and obtain a magnesium oxide retarder with a concentration of 200%. Add the retarder to water and magnesium oxide in an amount of 2% by mass of magnesium oxide, stir evenly, make a standard test piece, measure the initial setting time and final setting time, and record the data in Table 1.

[0026] Control 1: without adding pomelo peel extract, mix lightly burned magnesia and water according to the amount, measure the initial setting time and final setting time, and record the data in Table 1.

[0027] The test method of magnesium oxide setting time in the present invention is carried out with reference to the method of GB / T1346-...

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Abstract

The invention provides a shaddock peel extract liquid magnesium oxide retarder and application thereof. The magnesium oxide retarder is obtained by the following steps: washing shaddock peel, choppingthe treated shaddock peel, adding alcohol for extraction, filtering to obtain an extract, heating and concentrating the extract to obtain the retarder. Compared with the existing retarders such as hydroxycarboxylic acid and salts thereof, the magnesium oxide retarder is environmentally friendly, low in price, simple in preparation, safe and non-toxic, has a significant retarding effect, and can significantly prolong the setting time.

Description

technical field [0001] The invention belongs to cement-based material additives, in particular to a magnesium oxide retarder for pomelo peel extract, a preparation method and application. Background technique [0002] Light-burned magnesia is obtained by calcining magnesite at 700-1000°C, and is an important expansion agent. After the pouring of large-volume concrete such as dams and bridge piers, the hydration of the cement produces a large amount of hydration heat, which causes the temperature of the concrete to rise, and in the later stage, the temperature of the concrete gradually decreases, the elastic modulus of the structure gradually increases, and the constraints are strengthened, resulting in temperature drop and shrinkage crack. In the current technology, the temperature is usually lowered by means of laying condensation pipes and watering, which requires additional labor costs. Adding magnesia produces delayed micro-expansion, thereby compensating the temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/10C04B28/10C04B103/22
Inventor 蒋林华陈磊杨国辉靳卫准徐鹏陈晨王勇智李闪闪
Owner HOHAI UNIV
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