A kind of retarded calcium magnesium silicate phosphate cement and preparation method thereof

A technology of slow-setting calcium phosphate and cement, which is applied in the field of building materials, can solve the problems of prolonging the setting time and decreasing compressive strength, and achieve the effects of delaying the setting time of cement, high early strength and shortening the construction period

Active Publication Date: 2020-06-26
GUIZHOU PHOSPHORUS MAGNESIUM MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of retarder that can be added is limited to about 0.4-2% by weight, which can only prolong the setting time by about 10 minutes
Higher levels of retarders can further extend the setting time, but at the expense of a significant loss in the compressive strength of the cementitious cast after it has set

Method used

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  • A kind of retarded calcium magnesium silicate phosphate cement and preparation method thereof
  • A kind of retarded calcium magnesium silicate phosphate cement and preparation method thereof
  • A kind of retarded calcium magnesium silicate phosphate cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The raw material is: diammonium hydrogen phosphate (P 2 o 5 ≧25%, N≧20%) 26.8kg, monoammonium phosphate 4.4kg, magnesium chloride 54.8kg, fly ash 8.8kg, borax 0.4kg, potassium dihydrogen phosphate 0.4kg, calcium chloride 4.4kg.

[0026] Step 1: Grind magnesium chloride, calcium chloride, borax and fly ash to 400 mesh, and potassium dihydrogen phosphate, industrial monoammonium and diammonium phosphate to 180 mesh.

[0027] Step 2: Take the above-mentioned finely ground raw materials and put them into a blender for mixing.

[0028] Step 3: Put the uniformly stirred mixture into a dryer for drying at a temperature of 150° C. to obtain calcium silicate magnesium phosphate cement.

Embodiment 2

[0030] The raw material is: diammonium hydrogen phosphate (P 2 o 5 ≧30%, N≧15%) 20.2kg, monoammonium phosphate 10.1kg, magnesium chloride 33.5kg, fly ash 23kg, borax 1.9kg, potassium dihydrogen phosphate 1.7kg, calcium chloride 9.6kg.

[0031] Step 1: Grind magnesium chloride, calcium chloride, borax and fly ash to 200 mesh, and potassium dihydrogen phosphate, industrial monoammonium and diammonium phosphate to 100 mesh.

[0032] Step 2: Take the finely ground above-mentioned raw materials and put them into a mixer for mixing according to the mass ratio of the cement.

[0033] Step 3: Put the evenly stirred mixture into a dryer for drying at 60° C. to prepare calcium silicate magnesium cement.

Embodiment 3

[0035] The raw material is: diammonium hydrogen phosphate (P 2 o 5 ≧40%, N≧5%) 30.2kg, monoammonium phosphate 15.1kg, magnesium chloride 17.7kg, fly ash 31.6kg, borax 0.4kg, potassium dihydrogen phosphate 0.6kg, calcium chloride 4.4kg.

[0036] Step 1: Grind magnesium chloride, calcium chloride, borax and fly ash to 200-400 mesh, potassium dihydrogen phosphate, industrial monoammonium phosphate and diammonium phosphate to 100-180 mesh.

[0037] Step 2: Take the finely ground above-mentioned raw materials and put them into a mixer for mixing according to the mass ratio of the cement.

[0038] Step 3: put the uniformly stirred mixture into a dryer for drying at 100°C to obtain calcium silicate magnesium cement.

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Abstract

The invention discloses slow-setting calcium magnesium silico-phosphate cement and a manufacturing method of same, and relates to the field of building materials. The cement is composed of: a phosphorus raw material, a calcium raw material, a magnesium ore raw material, industrial waste residue powder, and a coagulation adjusting agent, wherein the ratios of the raw materials are described as follows, by mass: 13.6-47% of the phosphorus raw material, 4.4-9.6% of the calcium raw material, 17.7-54.8% of the magnesium ore raw material, 0.4-1.9% of the coagulation adjusting agent, and 8.8-40% of the industrial waste residue powder. In the invention, diammonium phosphate, as a main phosphorus raw material, is introduced to the cement and is reasonably matched with monoammonium phosphate, so that the cement has high early strength and flexural strength, and is delayed in setting time.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a retarded calcium-silicon-magnesium phosphate cement and a preparation method thereof. Background technique [0002] Magnesium phosphate cement (MPC) is a new type of inorganic cementitious material. As early as the 1930s and 1940s, Prosen and Rarnshaw discovered that MPC materials could be used in the foundry industry. MPC is a cementitious material that forms chemical bonds based on acid-base neutralization reactions to generate strength. Foreign scholars named it CBPCs (Chemically bondedphosphate ceramics). This type of cementitious material has excellent properties that traditional cement does not have: early strength and rapid hardening, strong cohesive force, good volume stability, good heat resistance, high temperature resistance, good compatibility with old concrete, and durability Good performance and wide environmental adaptability, etc., at the same time, it has the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B12/02
Inventor 张燕李泽钢杨步雷杨永彬项军付义宏向前勇王琴彭步平宋维相杨晓勇安柯王闯
Owner GUIZHOU PHOSPHORUS MAGNESIUM MATERIAL CO LTD
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