CN108793795B - Glass fiber magnesium phosphate cement and preparation method thereof - Google Patents
Glass fiber magnesium phosphate cement and preparation method thereof Download PDFInfo
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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Abstract
Glass fiber magnesium phosphate cement and a preparation method thereof, belonging to the field of rapid repair of cementing materials; the cement components are distributed according to the parts by weight: 300-500 parts of dead-burned magnesium oxide, 1000 parts of fine aggregate, 100 parts of acid material, 1.2-1.6 parts of toughening material, 16-20 parts of water, and the ratio of magnesium to phosphorus is (3-5): 1; the preparation method comprises the following steps: 1) calcining and grinding magnesite to obtain dead-burned magnesium oxide; 2) mixing the raw materials and stirring uniformly; 3) naturally curing the sample to obtain glass fiber magnesium phosphate cement; the invention improves the component design of the magnesium phosphate cement, and the magnesium phosphate cement is toughened and modified by adding the treated glass fiber while ensuring high strength, so that the repaired crack is prevented from secondary cracking, and the invention has simple operation and lower cost.
Description
Technical Field
The invention belongs to the field of rapid repair of cementing materials, and particularly relates to glass fiber magnesium phosphate cement and a preparation method thereof.
Background
Concrete materials are used as the most used building materials in the world nowadays, the service environment is increasingly severe, and the durability of concrete structures is receiving more attention. With the increase of the age of concrete materials, the structure of the concrete material can be damaged in different degrees under the action of various external factors, so that the integrity and the stability of the structure are influenced, a large number of concrete structures in service need to be repaired, particularly under the influence of environmental factors, the concrete structures are easy to have problems such as cracks, denudation, holes and the like, if the concrete structures cannot be timely treated, the damage to the structure can be aggravated, the stability of the structure can be influenced, the safety performance of the whole structure is influenced, in order to relieve the influence of the environment on the concrete structures and improve the social and economic benefits, a material with high condensation speed and high early strength needs to be sought, the damaged concrete structures can be repaired in a short time, and the stability of the structure can be quickly recovered. At present, most of commonly used repairing materials are magnesium phosphate cement, but the repairing materials have the defects of high brittleness and insufficient strength.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides glass fiber magnesium phosphate cement, which solves the problems of large brittleness and low bonding strength of the traditional magnesium phosphate cement.
The glass fiber magnesium phosphate cement comprises the following components in parts by weight: 300-500 parts of dead-burned magnesium oxide, 1000 parts of fine aggregate, 100 parts of acid material, 1.2-1.6 parts of toughening material, 16-20 parts of water, and the ratio of magnesium to phosphorus is (3-5): 1.
the dead burned magnesia is made of magnesite (MgCO)3) The powder is ground after calcination, the mass purity is more than 90 percent, the 200-mesh sieve residue is less than 10 percent, and the specific surface area is 238m2/kg；
The fine aggregate is quartz sand, and the modulus is 2.2-2.8;
the acidic material is potassium dihydrogen phosphate (KH)2PO4) The grade is industrial purity, the mass purity is more than 96%, and the granularity is 245-350 mu m;
the toughening material is glass fiber subjected to surface treatment by a treating agent, wherein the treating agent is a silane coupling agent mixed solution, and the chemical components of the toughening material are ethanol: deionized water: acetic acid: silane coupling agent KH570 ═ 230: 25: 4: 1200, 100-400 parts by weight.
A preparation method of glass fiber magnesium phosphate cement comprises the following specific steps:
(1) calcining magnesite at 1400 ℃ or 1800 ℃, and grinding to obtain dead-burned magnesium oxide;
(2) weighing and burning magnesium oxide, monopotassium phosphate, quartz sand and water according to the component proportion of the glass fiber magnesium phosphate cement, respectively, sequentially and respectively putting the materials into a stirring pot, stirring for 45-60 s, then adding glass fibers into the materials, stirring at a low speed, and then stirring at a high speed to obtain a magnesium phosphate cement cementing material;
(3) and quickly pouring the uniformly stirred magnesium phosphate cement cementing material into a triple die, vibrating uniformly, standing for 1-3 h, removing the die, and placing the test piece indoors for natural curing for 1d, 3d and 7d to obtain the glass fiber magnesium phosphate cement.
The preparation method of the glass fiber magnesium phosphate cement comprises the following steps:
in the step 1, the mass purity of the dead burned magnesium oxide is more than 90 percent, the residue of a 200-mesh sieve is less than 10 percent, and the specific surface area is 238m2/kg；
In the step 2, the surface treatment process of the glass fiber comprises the following steps: soaking in the silane coupling agent mixed solution for 30-40 min, and placing in an oven to be dried at 40-50 ℃.
In the step 2, stirring at a low speed of 140 +/-5 r/min for 45-60 s, and stirring at a high speed of 285 +/-10 r/min for 2-3 min.
In the step 3, the size of the die is 40mm multiplied by 160 mm.
In the step 3, the local indoor temperature is 20-25 ℃ and the humidity is 70%.
The glass fiber magnesium phosphate cement has the compressive strength of 52.1-79.5 MPa and the flexural strength of 5.7-17.1 MPa.
Compared with the prior art, the glass fiber magnesium phosphate cement and the preparation method thereof have the beneficial effects that:
the invention improves the component design of the magnesium phosphate cement, and the magnesium phosphate cement is toughened and modified by adding the treated glass fiber while ensuring high strength, so that the repaired crack is prevented from secondary cracking, and the invention has simple operation and lower cost.
Drawings
FIG. 1 is a scanning electron micrograph of a magnesium polyphosphate cement made from untreated glass fibers of a comparative example of the present invention;
FIG. 2 is a scanning electron micrograph of a glass fiber magnesium phosphate cement prepared according to example 1 of the present invention.
Detailed Description
In the following examples 1 to 5, the fine aggregate is quartz sand, and the modulus is 2.2 to 2.8; the acidic material is potassium dihydrogen phosphate (KH)2PO4) The grade is industrial purity, the mass purity is more than 96%, and the granularity is 245-350 mu m; the toughening material is glass fiber subjected to surface treatment by a treating agent, wherein the treating agent is a silane coupling agent mixed solution, and the chemical components of the toughening material are ethanol: deionized water: acetic acid: silane coupling agent KH570 ═ 230: 25: 4: 1200, 100-400 parts by weight.
Glass fiber magnesium phosphate cement prepared in the following examples 1 to 5 is prepared according to the water-to-cement ratio of (0.16-0.2): 1. the glue-sand ratio is 1: 1, mixing with sodium tetraborate and water to prepare Portland cement for tensile test, symmetrically placing the formed 8-shaped test piece on a clamp of a tensile tester, and ensuring that the test piece is placed in the axial direction to be stretched as far as possible in order to prevent the diagonal tension effect and the torque. And loading at a proper loading speed until the test piece is damaged, and recording the load value when the test piece is damaged and the fracture position of the test piece. The width and the thickness of the fracture position of the 8-shaped test piece are measured by a vernier caliper, the tensile bonding strength of the mortar is calculated according to the formula F/bh in mm, and the bonding condition of the magnesium phosphate cement and the old soil concrete is analyzed.
The magnesium phosphate cement cementing material prepared in the following embodiments 1-5 is quickly put into a position needing reinforcement for testing, firstly, a grinding machine is used for treating a damaged part, then, a handheld impact pickaxe is used for removing and leveling residual materials of an old concrete structure in a required repairing range, then, a repairing interface is roughened, loose particles and silt at the roughened part are brushed by a steel brush to ensure the cleanness of a bonding interface, then, the stirred magnesium phosphate cement repairing material is poured on a damaged concrete structure which is cleaned in advance, and the damaged concrete structure is tamped, paved and maintained for 2 hours. The magnesium phosphate cement mortar strip adopts a 30 universal servo testing machine to test the performance of the compressive strength and the flexural strength, and the specific test method is executed according to GB/T17671-19995 cement mortar strength test method.
Comparative example
The glass fiber magnesium phosphate cement comprises the following components in parts by weight: 400 parts of dead burned magnesium oxide, 1000 parts of fine aggregate, 100 parts of acid material, 1.6 parts of toughening material, 20 parts of water, and the ratio of magnesium to phosphorus is 4: 1.
the dead burned magnesia is made of magnesite (MgCO)3) The powder is ground after calcination, the mass purity is more than 90 percent, the 200-mesh sieve residue is less than 10 percent, and the specific surface area is 238m2/kg；
The fine aggregate is quartz sand, and the modulus is 2.2;
the acidic material is potassium dihydrogen phosphate (KH)2PO4) The grade is industrial purity, the mass purity is more than 96%, and the granularity is 245-350 mu m;
the toughening material is glass fiber which is not subjected to surface treatment by a treatment agent.
The preparation method of the glass fiber magnesium phosphate cement comprises the following specific steps:
(1) calcining magnesite at 1400 ℃, and grinding to obtain dead-burned magnesium oxide;
(2) weighing and burning magnesium oxide, monopotassium phosphate, quartz sand and water according to the component proportion of the glass fiber magnesium phosphate cement, respectively, putting the materials into a stirring pot in sequence, stirring for 45s, adding glass fibers into the materials, stirring for 45s at a low speed of 140 +/-5 r/min, and stirring for 2min at a high speed of 285 +/-10 r/min to obtain a magnesium phosphate cement cementing material;
(3) and quickly pouring the uniformly stirred magnesium phosphate cement cementing material into a triple die with the thickness of 40mm multiplied by 160mm, vibrating uniformly, standing for 1h, then removing the die, placing the test piece indoors for natural curing for 1d, 3d and 7d, wherein the indoor temperature is 20 ℃ and the humidity is 70% locally, and thus obtaining the glass fiber magnesium phosphate cement.
The compressive and flexural strength of the glass fiber magnesium phosphate cement prepared by the embodiment is shown in table 1, and the microstructure is shown in fig. 1.
TABLE 1
The scanning electron microscope image of the glass fiber magnesium phosphate cement prepared by the comparative example is shown in figure 1.
Example 1
The glass fiber magnesium phosphate cement comprises the following components in parts by weight: 300 parts of dead burned magnesium oxide, 1000 parts of fine aggregate, 100 parts of acid material, 1.2 parts of toughening material, 16 parts of water, and the ratio of magnesium to phosphorus is 3: 1.
the preparation method of the glass fiber magnesium phosphate cement comprises the following specific steps:
(1) calcining magnesite at 1400 ℃, and grinding to obtain dead-burned magnesium oxide;
(2) weighing and burning magnesium oxide, monopotassium phosphate, quartz sand and water according to the component proportion of the glass fiber magnesium phosphate cement, respectively, sequentially and respectively putting the materials into a stirring pot, stirring for 45s, then adding glass fibers subjected to surface treatment by silane coupling agent mixed liquid, firstly stirring for 45s at a low speed of 140 +/-5 r/min, and then stirring for 2min at a high speed of 285 +/-10 r/min to obtain a magnesium phosphate cement cementing material;
(3) and quickly pouring the uniformly stirred magnesium phosphate cement cementing material into a triple die with the thickness of 40mm multiplied by 160mm, vibrating uniformly, standing for 1h, then removing the die, placing the test piece indoors for natural curing for 1d, 3d and 7d, wherein the indoor temperature is 20 ℃ and the humidity is 70% locally, and thus obtaining the glass fiber magnesium phosphate cement.
The bonding drawing force of the glass fiber magnesium phosphate cement prepared by the embodiment is 735.4N, the total pore volume, the pore size distribution, the porosity and the water resistance of the glass fiber magnesium phosphate cement are not greatly influenced, the glass fiber magnesium phosphate cement is poured to the other side, which is provided with the silicate cement in advance, of one side of an 8-shaped mould as a repairing material to test the bonding strength, wherein the water-cement ratio of the silicate cement is 0.16: 1. the glue-sand ratio is 1: 1, mixing sodium tetraborate, magnesium phosphate cement and water, wherein the 7d bonding tensile strength is 2.2 MPa. The compressive and flexural strengths of the glass fiber magnesium phosphate cements are shown in Table 2.
As shown in fig. 2, a scanning electron microscope image of the magnesium phosphate cement containing glass fibers prepared in this example shows that, compared with the magnesium phosphate cement containing untreated glass fibers, the magnesium phosphate cement containing glass fibers subjected to surface modification treatment has a significant concave-convex surface, and what effect is brought by the concave-convex surface can be clearly seen.
TABLE 2
Example 2
The glass fiber magnesium phosphate cement comprises the following components in parts by weight: 400 parts of dead burned magnesium oxide, 1000 parts of fine aggregate, 100 parts of acid material, 1.2 parts of toughening material, 18 parts of water, and the ratio of magnesium to phosphorus is 4: 1.
the dead burned magnesia is made of magnesite (MgCO)3) The powder is ground after calcination, the mass purity is more than 90 percent, the 200-mesh sieve residue is less than 10 percent, and the specific surface area is 238m2/kg；
The preparation method of the glass fiber magnesium phosphate cement comprises the following specific steps:
(1) calcining magnesite at 1800 ℃, and grinding to obtain dead-burned magnesium oxide;
(2) weighing and burning magnesium oxide, monopotassium phosphate, quartz sand and water according to the component proportion of the glass fiber magnesium phosphate cement, respectively, sequentially and respectively putting the materials into a stirring pot, stirring for 60s, then adding glass fibers subjected to surface treatment by silane coupling agent mixed liquid, firstly stirring for 45s at a low speed of 140 +/-5 r/min, and then stirring for 2min at a high speed of 285 +/-10 r/min to obtain a magnesium phosphate cement cementing material;
(2) and quickly pouring the uniformly stirred magnesium phosphate cement cementing material into a triple die with the thickness of 40mm multiplied by 160mm, vibrating uniformly, standing for 1h, then removing the die, placing the test piece indoors for natural curing for 1d, 3d and 7d, wherein the indoor temperature is 25 ℃ and the humidity is 70% locally, and obtaining the glass fiber magnesium phosphate cement.
The bonding drawing force of the glass fiber magnesium phosphate cement prepared by the embodiment is 756.6N, the total pore volume, the pore size distribution, the porosity and the water resistance of the glass fiber magnesium phosphate cement are not greatly influenced, the glass fiber magnesium phosphate cement is poured to the other side, which is provided with the silicate cement in advance, of the 8-shaped die as a repairing material, and the bonding strength is tested, wherein the silicate cement is mixed with the silicate cement according to the water-cement ratio of 0.16: 1. the glue-sand ratio is 1: 1, mixing sodium tetraborate, magnesium phosphate cement and water, wherein the 7d bonding tensile strength is 2.6 MPa. The compressive strength and the flexural strength of the glass fiber magnesium phosphate cement are shown in Table 3.
TABLE 3
Example 3
The glass fiber magnesium phosphate cement comprises the following components in parts by weight: 300 parts of dead burned magnesium oxide, 1000 parts of fine aggregate, 100 parts of acid material, 1.2 parts of toughening material, 16 parts of water, and the ratio of magnesium to phosphorus is 3: 1.
the preparation method of the glass fiber magnesium phosphate cement comprises the following specific steps:
(1) calcining magnesite at 1400 ℃, and grinding to obtain dead-burned magnesium oxide;
(2) weighing and burning magnesium oxide, monopotassium phosphate, quartz sand and water according to the component proportion of the glass fiber magnesium phosphate cement, respectively, sequentially and respectively putting the materials into a stirring pot, stirring for 50s, then adding glass fibers subjected to surface treatment by silane coupling agent mixed liquid, firstly stirring for 55s at a slow speed of 140 +/-5 r/min, and then stirring for 2.5min at a high speed of 285 +/-10 r/min to obtain a magnesium phosphate cement cementing material;
(2) and quickly pouring the uniformly stirred magnesium phosphate cement cementing material into a triple die with the thickness of 40mm multiplied by 160mm, vibrating uniformly, standing for 1h, then removing the die, placing the test piece indoors for natural curing for 1d, 3d and 7d, wherein the indoor temperature is 25 ℃ and the humidity is 70% locally, and obtaining the glass fiber magnesium phosphate cement.
The bonding drawing force of the glass fiber magnesium phosphate cement prepared by the embodiment is 745.6N, the total pore volume, the pore size distribution, the porosity and the water resistance of the glass fiber magnesium phosphate cement are not greatly influenced, the glass fiber magnesium phosphate cement is poured to the other side, which is provided with the silicate cement in advance, of one side of an 8-shaped mould as a repairing material to test the bonding strength, wherein the water-to-cement ratio of the silicate cement is 0.2: 1. the glue-sand ratio is 1: 1, mixing sodium tetraborate, magnesium phosphate cement and water, wherein the 7d bonding tensile strength is 2.1 MPa. The compressive strength and the flexural strength of the glass fiber magnesium phosphate cement are shown in Table 4.
TABLE 4
Example 4
The glass fiber magnesium phosphate cement comprises the following components in parts by weight: 400 parts of dead burned magnesium oxide, 1000 parts of fine aggregate, 100 parts of acid material, 1.2 parts of toughening material, 20 parts of water, and the ratio of magnesium to phosphorus is 4: 1.
the preparation method of the glass fiber magnesium phosphate cement comprises the following specific steps:
(1) calcining magnesite at 1800 ℃, and grinding to obtain dead-burned magnesium oxide;
(2) weighing and burning magnesium oxide, monopotassium phosphate, quartz sand and water according to the component proportion of the glass fiber magnesium phosphate cement, respectively, sequentially and respectively putting the materials into a stirring pot, stirring for 60s, then adding glass fibers subjected to surface treatment by silane coupling agent mixed liquid, firstly stirring for 50s at a low speed of 140 +/-5 r/min, and then stirring for 3min at a high speed of 285 +/-10 r/min to obtain a magnesium phosphate cement cementing material;
(2) and quickly pouring the uniformly stirred magnesium phosphate cement cementing material into a triple die with the thickness of 40mm multiplied by 160mm, vibrating uniformly, standing for 1h, then removing the die, placing the test piece indoors for natural curing for 1d, 3d and 7d, wherein the indoor temperature is 25 ℃ and the humidity is 70% locally, and obtaining the glass fiber magnesium phosphate cement.
The bonding drawing force of the glass fiber magnesium phosphate cement prepared by the embodiment is 748.9N, the total pore volume, the pore size distribution, the porosity and the water resistance of the glass fiber magnesium phosphate cement are not greatly influenced, the glass fiber magnesium phosphate cement is poured to the other side, which is provided with the silicate cement in advance, of one side of an 8-shaped mould as a repairing material to test the bonding strength, wherein the water-to-cement ratio of the silicate cement is 0.2: 1. the glue-sand ratio is 1: 1, mixing sodium tetraborate, magnesium phosphate cement and water, wherein the 7d bonding tensile strength is 2.5 MPa. The compressive strength and the flexural strength of the glass fiber magnesium phosphate cement are shown in Table 5.
TABLE 5
Example 5
The glass fiber magnesium phosphate cement comprises the following components in parts by weight: 500 parts of dead burned magnesium oxide, 1000 parts of fine aggregate, 100 parts of acid material, 1.6 parts of toughening material, 18 parts of water, and the ratio of magnesium to phosphorus is 5: 1.
the preparation method of the glass fiber magnesium phosphate cement comprises the following specific steps:
(1) calcining magnesite at 1400 ℃, and grinding to obtain dead-burned magnesium oxide;
(2) weighing and burning magnesium oxide, monopotassium phosphate, quartz sand and water according to the component proportion of the glass fiber magnesium phosphate cement, respectively, sequentially and respectively putting the materials into a stirring pot, stirring for 50s, then adding glass fibers subjected to surface treatment by silane coupling agent mixed liquid, firstly stirring for 55s at a slow speed of 140 +/-5 r/min, and then stirring for 2.5min at a high speed of 285 +/-10 r/min to obtain a magnesium phosphate cement cementing material;
(2) and quickly pouring the uniformly stirred magnesium phosphate cement cementing material into a triple die with the thickness of 40mm multiplied by 160mm, vibrating uniformly, standing for 1h, then removing the die, placing the test piece indoors for natural curing for 1d, 3d and 7d, wherein the indoor temperature is 25 ℃ and the humidity is 70% locally, and obtaining the glass fiber magnesium phosphate cement.
The compressive strength and the flexural strength of the glass fiber magnesium phosphate cement obtained in this example are shown in Table 6.
TABLE 6
Claims (4)
1. The glass fiber magnesium phosphate cement is characterized by comprising the following components in parts by weight: 300-500 parts of dead-burned magnesium oxide, 1000 parts of fine aggregate, 100 parts of acid material, 1.2-1.6 parts of toughening material, 16-20 parts of water, and the ratio of magnesium to phosphorus is (3-5): 1;
the dead burned magnesia is prepared by grinding calcined magnesite, the mass purity is more than 90 percent, the 200-mesh sieve residue is less than 10 percent, and the specific surface area is 238m2/kg；
The fine aggregate is quartz sand, and the modulus is 2.2-2.8;
the acidic material is potassium dihydrogen phosphate (KH)2PO4) The grade is industrial purity, the mass purity is more than 96%, and the granularity is 245-350 mu m;
the toughening material is glass fiber subjected to surface treatment by a treating agent, wherein the treating agent is a silane coupling agent mixed solution, and the chemical components of the toughening material are ethanol: deionized water: acetic acid: silane coupling agent KH570 ═ 230: 25: 4: 1200, 100-400 parts by weight;
the compression strength of the magnesium phosphate cement is 52.1-79.5 MPa, and the breaking strength of the magnesium phosphate cement is 5.7-17.1 MPa.
2. The preparation method of the glass fiber magnesium phosphate cement as claimed in claim 1, which is characterized by comprising the following steps:
(1) calcining magnesite at 1400 deg.C or 1800 deg.C, and grinding to obtain magnesite with mass purity of more than 90%, 200-mesh sieve residue of less than 10%, and specific surface area of 238m2(ii) dead-burned magnesium oxide per kg;
(2) weighing and burning magnesium oxide, monopotassium phosphate, quartz sand and water according to the component proportion of the glass fiber magnesium phosphate cement, respectively, sequentially and respectively putting the materials into a stirring pot, stirring for 45-60 s, then adding glass fibers into the materials, stirring at a low speed, and then stirring at a high speed to obtain a magnesium phosphate cement cementing material; wherein, the surface treatment process of the glass fiber comprises the following steps: soaking in a silane coupling agent mixed solution for 30-40 min, and placing in an oven to be dried at 40-50 ℃;
(3) and quickly pouring the uniformly stirred magnesium phosphate cement cementing material into a triple die with the size of 40mm multiplied by 160mm, vibrating uniformly, standing for 1-3 h, removing the die, and placing the test piece indoors for natural curing for 1d, 3d and 7d to obtain the glass fiber magnesium phosphate cement.
3. The method for preparing glass fiber magnesium phosphate cement according to claim 2, wherein in the step (2), the mixture is slowly stirred for 45-60 s at 140 +/-5 r/min and is stirred for 2-3 min at high speed of 285 +/-10 r/min.
4. The method for preparing glass fiber magnesium phosphate cement according to claim 2, wherein in the step (3), the local indoor temperature is 20-25 ℃ and the humidity is 70%.
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| US5002610A (en) * | 1985-12-12 | 1991-03-26 | Rhone-Poulenc Basic Chemicals Co. | Process for making reinforced magnesium phosphate fast-setting cements |
| CN101708985A (en) * | 2009-10-29 | 2010-05-19 | 中国人民解放军后勤工程学院 | Quick-hardening high-early strength concrete-based composite material for maritime work |
| CN104692766A (en) * | 2015-02-11 | 2015-06-10 | 中国科学院合肥物质科学研究院 | Pavement and crack rapid-repairing material capable of being used in cold region and preparation method of pavement and crack rapid-repairing material |
| CN104909709A (en) * | 2015-05-26 | 2015-09-16 | 武汉市市政建设集团有限公司 | Green rapid-hardening early-strength magnesium phosphate-based healant and preparation method thereof |
| CN105272138A (en) * | 2015-10-10 | 2016-01-27 | 同济大学 | Magnesium phosphate cement based rapid repair mortar and preparation method thereof |
| CN108249795A (en) * | 2018-02-02 | 2018-07-06 | 重庆大学 | A kind of magnesium phosphate cement |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5002610A (en) * | 1985-12-12 | 1991-03-26 | Rhone-Poulenc Basic Chemicals Co. | Process for making reinforced magnesium phosphate fast-setting cements |
| CN101708985A (en) * | 2009-10-29 | 2010-05-19 | 中国人民解放军后勤工程学院 | Quick-hardening high-early strength concrete-based composite material for maritime work |
| CN104692766A (en) * | 2015-02-11 | 2015-06-10 | 中国科学院合肥物质科学研究院 | Pavement and crack rapid-repairing material capable of being used in cold region and preparation method of pavement and crack rapid-repairing material |
| CN104909709A (en) * | 2015-05-26 | 2015-09-16 | 武汉市市政建设集团有限公司 | Green rapid-hardening early-strength magnesium phosphate-based healant and preparation method thereof |
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| CN108249795A (en) * | 2018-02-02 | 2018-07-06 | 重庆大学 | A kind of magnesium phosphate cement |
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