A kind of magnesium oxalate cement

An oxalate and cement technology, applied in the field of building materials, can solve the problems of limited large-scale application, high construction difficulty, secondary pollution, etc., and achieve the effects of adjustable reaction speed, prolonged setting time, and reduced construction difficulty.

Active Publication Date: 2020-04-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, magnesium phosphate cement reacts quickly at high temperatures, hardens too quickly, and is not fast enough at extremely low temperatures, making construction difficult. The reaction between magnesium oxide and ammonium hydrogen phosphate will release ammonia gas with a pungent odor, which limits its use in many aspects. large-scale application
At the same time, industries such as magnesium oxychloride cement and magnesium oxysulfide cement will release gas with pungent odor during the reaction process, causing secondary pollution

Method used

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  • A kind of magnesium oxalate cement
  • A kind of magnesium oxalate cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: The composition of this magnesium oxalate cement is: 100g of acidic component, 100g of magnesium oxide, 12g of setting material; wherein the acidic component is potassium hydrogen oxalate; after sintering at 1500°C, the magnesium oxide is passed through 80 mesh Sieve, the sieve residue is not more than 5%; the setting material is 5g of boric acid, 5g of sodium chloride, 2g of sodium citrate, and 40g of water;

[0022] Mix the above raw materials evenly, quickly pour them into a six-unit mold of 20mm*20mm*20mm, vibrate and form on a vibrating table, scrape the upper part, measure the solidification time for 15 minutes, demould after 5 hours and place in the air After natural maintenance to a certain age, its mechanical properties were tested: 1d, 3d, and 7d compressive strengths were 32.52Mpa, 33.33Mp, and 33.87Mpa, respectively.

Embodiment 2

[0023] Example 2: The magnesium oxalate cement composition is: 100g of acidic component, 100g of magnesium oxide, and 12g of setting material; wherein the acidic component is potassium hydrogen oxalate; after sintering at 900°C, the magnesium oxide is passed through 80 mesh Sieve, the sieve residue is not more than 5%; the setting material is 5g of boric acid, 5g of sodium chloride, 2g of sodium citrate, and 40g of water;

[0024] Mix the above raw materials evenly, quickly pour them into a six-unit mold of 20mm*20mm*20mm, vibrate and form on a vibrating table, scrape the upper part, and measure the solidification time to be 13 minutes, demould after 5 hours and place in the air Naturally preserved to a certain age, its mechanical properties were tested: 1d, 3d, and 7d compressive strengths were 32.15Mpa, 32.96Mp, and 33.02Mpa, respectively.

Embodiment 3

[0025] Embodiment 3: The composition of this magnesium oxalate cement is: 100g of acidic component, 130g of magnesium oxide, 13g of setting-adjusting material; wherein the acidic component is oxalic acid dihydrate; the setting-adjusting material is 10g of borax, 3g of sodium chloride , using 55g of water;

[0026] Mix the above raw materials evenly, quickly pour them into a six-unit mold of 20mm*20mm*20mm, vibrate and form on a vibrating table, scrape the upper part flat, measure the solidification time for 6 minutes, demould after 5 hours and place in the air After natural curing to a certain age, its mechanical properties were tested: 1d, 3d, and 7d compressive strengths were 31.52Mpa, 32.06Mp, and 32.98Mpa, respectively.

[0027] The material was subjected to SEM morphology analysis, the results are shown in figure 1 , it can be seen from the figure that the cured body is closely combined, and the adjacent particles are connected to each other to form a gel material with a...

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Abstract

The invention discloses novel magnesium-base oxalate cement and a preparation method thereof, and belongs to the technical field of constructional material. The cement is prepared from the following raw materials in parts by weight by uniform mixing: 100 parts of an acidic component, 60-150 parts of magnesium oxide, 7-30 parts of a setting regulating material and 30-75 parts of water. The novel magnesium-base oxalate cement has the advantages of controllable rate of setting, rapid hardening, high strength, strong binding force, good volume stability, good wear resistance, good frost resistance and the like, and the setting time is 6min-240min. The novel magnesium-base oxalate cement has simple operation of a preparation process and good constructability, can be applied to quick repair of speedways, airport pavements, bridges and main roads, and also has extensive application prospects in the aspects of solid waste treatment and curing and the like.

Description

technical field [0001] The invention relates to a magnesium-based oxalate cement, which belongs to the technical field of building materials. Background technique [0002] Magnesium-based acid-base cement is an inorganic gelling material with bonding properties formed by the acid-base reaction of magnesium oxide and acid or acid salt. At present, the more mature research is magnesium phosphate cement. Also known as magnesium phosphate chemically bonded ceramic cementitious material. Magnesium phosphate chemically bonded material produces a strong cementitious material by chemically reacting acid phosphate in the raw material with magnesium oxide to form struvite. Magnesium phosphate cement has better performance than traditional cement in many aspects, such as: fast setting and hardening, high early strength, fast low temperature setting speed, high bonding strength with old concrete; good wear resistance and frost resistance, dry zoom out. Magnesium phosphate cement has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B9/00C04B9/02
CPCC04B9/00C04B9/02
Inventor 周新涛王敬冬
Owner KUNMING UNIV OF SCI & TECH
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