CN111362644A - Polymer modified nickel slag sand anti-cracking dry-mixed mortar - Google Patents

Polymer modified nickel slag sand anti-cracking dry-mixed mortar Download PDF

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Publication number
CN111362644A
CN111362644A CN202010327826.4A CN202010327826A CN111362644A CN 111362644 A CN111362644 A CN 111362644A CN 202010327826 A CN202010327826 A CN 202010327826A CN 111362644 A CN111362644 A CN 111362644A
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China
Prior art keywords
nickel slag
sand
slag sand
styrene
mixed mortar
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CN202010327826.4A
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Chinese (zh)
Inventor
江飞飞
李大旺
马剑
霍逸飞
徐春玉
孔芬
卞梁
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Jiangsu University of Science and Technology
Zhangjiagang Industrial Technology Research Institute of Jiangsu University of Science and Technology
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Jiangsu University of Science and Technology
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Priority to CN202010327826.4A priority Critical patent/CN111362644A/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The polymer modified nickel slag sand anti-cracking dry-mixed mortar comprises the following raw materials in parts by weight: 462 and 693 parts by weight of river sand; 77-308 parts of nickel slag sand; 200 portions of cement and 300 portions of cement; 3-10 parts of a water reducing agent; 150 portions of water and 200 portions of water; wherein the dosage of the nickel slag sand is not more than 40 percent of the total mass of the river sand and the nickel slag sand, and the nickel slag sand is obtained by sequentially carrying out alkali activator treatment and styrene-acrylic polymer treatment on raw nickel slag sand. The scheme of the invention provides a method for preparing dry-mixed mortar by using nickel-containing slag sand as a micro-active fine aggregate to replace partial natural river sand, so that the environmental pollution caused by nickel slag is reduced, the use of natural river sand is reduced, and the cost is reduced.

Description

Polymer modified nickel slag sand anti-cracking dry-mixed mortar
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to polymer modified nickel slag sand anti-cracking dry-mixed mortar.
Background
Building mortar is a bulk building material second only to wall materials and concrete, and the amount used is as much as hundreds of millions of tons every year. The traditional mortar mixed on site is limited by conditions, has low metering accuracy, poor quality stability, large contractibility, low bonding strength and easy peeling, and often has quality problems. The industrial production replaces the on-site preparation and development of high-performance ready-mixed mortar, which is the development direction and trend of mortar technology. The ready-mixed mortar is used as a main form of commercial mortar and is mainly used for bulk masonry mortar and plastering mortar, all components of the ready-mixed mortar are uniformly metered and mixed in a professional factory, the strength is high and stable, the workability is good, the construction is easy, the ready-mixed mortar is beneficial to civilized construction and technical progress, and the comprehensive benefit is good.
At present, most dry-mixed mortar in China uses natural river sand, but with higher and higher environmental protection requirements in various places, the mining is more and more serious, the price of the river sand is continuously increased, and even sea sand is illegally used in individual projects. In general, the current situation of the lack of natural yarn in China is difficult to improve in a short time, so that a new river sand substitute is urgently needed to be researched.
Nickel is a non-ferrous metal with strategic significance and is widely applied to military industry, national defense industry, and meanwhile, nickel is also a necessary component for producing stainless steel. However, the nickel content of the nickel ore is very low, even the beneficiated ore can only reach 6% -12%, the slag yield after smelting reaches 80% -90% of the raw material quality, the newly added nickel slag reaches 3000 ten thousand tons every year in China at present, and the nickel slag is developed into fourth large smelting industrial waste slag after slag, steel slag and red mud. Because the nickel slag has high treatment difficulty and poor stability, only 8 percent of the nickel slag is applied to the preparation of nickel slag concrete, and most of the rest of the nickel slag can be only piled or buried, thereby not only wasting resources, but also seriously polluting the environment and becoming a main obstacle for ferronickel smelting.
At present, the existing nickel slag concrete is prepared by grinding nickel slag to prepare nickel slag powder to replace cement, but the activity of the nickel slag powder is far lower than that of the cement, so that the strength of mortar is influenced; because the nickel slag has high hardness, a large amount of electricity is needed for grinding, and the cost is higher; and because of containing partial free calcium oxide and magnesium oxide, the stability can not be guaranteed, and the problem of poor stability exists.
Disclosure of Invention
The polymer modified nickel slag sand anti-cracking dry-mixed mortar of the invention obtains 0.25mm-4.75mm continuous graded nickel slag sand after simply screening nickel slag, eliminates the stability problem by alkali excitation, solves the problem of nickel slag by modifying styrene-acrylic polymer, prepares the nickel slag sand dry-mixed mortar, effectively solves the problem of environmental pollution, solves the problem of scarcity of natural river sand in China, and has stronger economic benefit.
It should be noted that the parts by weight in the present embodiment refers to a reference mass unit in the same execution case, and may be a mass unit in an international standard unit, such as gram, kilogram, ton, etc.; other specified units, such as hectogram, etc., are also possible.
The invention discloses polymer modified nickel slag sand anti-cracking dry-mixed mortar which comprises the following raw materials in parts by weight:
462 and 693 parts by weight of river sand;
77-308 parts of nickel slag sand;
200 portions of cement and 300 portions of cement;
3-10 parts of a water reducing agent;
150 portions of water and 200 portions of water;
wherein the dosage of the nickel slag sand is not more than 40 percent of the total mass of the river sand and the nickel slag sand, and the nickel slag sand is obtained by sequentially carrying out alkali activator treatment and styrene-acrylic polymer treatment on raw nickel slag sand. Preferably, the nickel slag sand is prepared by crushing and screening nickel slag, and screening out large particles with the particle size of 4.75mm to prepare 0.25mm-4.75mm continuous graded nickel slag sand. The nickel slag also contains calcite and (CaCO)3) Magnesium aluminate spinel (MgAl)2O4) And minerals such as magnesium silicate and the like, and has better potential activity; but the calcium oxide and the magnesium oxide which are free are contained at the same time, and if the calcium oxide and the magnesium oxide are not processed, the later stage is easy to expand to cause stability.
This patent takes two measures simultaneously for the stability problem: 1. activating the nickel slag by using an alkali activator; 2. the styrene-acrylic polymer is adopted to carry out surface modification on the nickel slag sand, the water absorption rate is improved, and internal maintenance is formed
The invention discloses an improvement of polymer modified nickel slag sand anti-cracking dry-mixed mortar, which is characterized in that the raw materials also comprise 5-30 parts by weight of lignin fiber.
The invention discloses an improvement of polymer modified nickel slag sand anti-cracking dry-mixed mortar, wherein the raw materials also comprise glass fiber with the mixing amount of 0.1-0.4% of the total mass of the dry-mixed mortar.
The invention discloses an improvement of polymer modified nickel slag sand anti-cracking dry-mixed mortar, which comprises the following raw materials that the mixing amount of the polymer modified nickel slag sand anti-cracking dry-mixed mortar is 40-60kg/m3Fly ash.
The invention discloses an improvement of polymer modified nickel slag sand anti-cracking dry-mixed mortar, wherein the treatment of styrene-acrylic polymer to nickel slag sand raw sand is to spray styrene-acrylic polymer solution on the surface of the nickel slag sand raw sand and stir. After the polymer is modified, the interface bonding strength of the nickel slag sand and the set cement is enhanced, and the mortar performance is improved. Preferably, the styrene-acrylic polymer emulsion is styrene-acrylic, hydroxyethyl methacrylate and water according to the weight ratio of (40-50): 1: 250, and continuously stirring for 4 to 6 hours at a temperature of between 70 and 90 ℃ to prepare the emulsion with the solid content of between 3 and 6 percent. Further preferably, the treatment of the nickel slag sand raw sand by the styrene-acrylic polymer is to spray a styrene-acrylic polymer solution accounting for 2-6% of the mass of the nickel slag sand on the surface of the nickel slag sand raw sand and stir the mixture.
The invention discloses an improvement of polymer modified nickel slag sand anti-cracking dry-mixed mortar, wherein a styrene-acrylic polymer is prepared from a styrene-acrylic emulsion and water according to a mass ratio of (1-1.5): 2, mixing to obtain the product.
The invention discloses an improvement of polymer modified nickel slag sand anti-cracking dry-mixed mortar, wherein an alkali activator is NaOH or KOH.
The invention discloses an improvement of polymer modified nickel slag sand anti-cracking dry-mixed mortar, wherein the dosage of an alkali activator is 4-8% of the mass of the nickel slag sand. By selecting KOH and NaOH powder as an alkali activator (preferably 6 percent of the mass of the nickel slag), the activity of the nickel slag is fully activated, the strength of concrete is improved, and the problem of poor stability of the nickel slag is solved.
The invention discloses an improvement of polymer modified nickel slag sand anti-cracking dry-mixed mortar.
The scheme of the invention is as follows:
1. the nickel slag is not required to be ground to the fineness of cement and ground to the fineness of sand.
2. The styrene-acrylic polymer modified nickel slag sand improves the water absorption rate and water retention of the mortar, forms internal curing, promotes the reaction of nickel slag and improves the performance of the mortar; the modification enhances the interface strength of the nickel slag and the set cement.
3. Paying attention to the stability problem, activating the activity of the nickel slag by using alkali, and eliminating the stability problem.
According to the invention, the nickel slag is simply screened to obtain 0.25-4.75 mm continuous graded nickel slag sand, the stability problem is eliminated by alkali excitation, the nickel slag is solved by modifying the styrene-acrylic polymer, and the nickel slag sand dry-mixed mortar is prepared, so that the problem of environmental pollution is effectively solved, the problem of scarcity of natural river sand in China is solved, and the economic benefit is stronger.
In the implementation of the prior art, according to GB/T14684-2011 'construction sand', the sand and the concrete play a role of a framework, the sand and the concrete are matched with stones and the like to form a reasonable particle size, a continuous gradation of 0.15-4.75mm is required, but the nickel slag has too high hardness, and a large amount of extra electricity is consumed when the nickel slag is ground downwards to be 0.25 mm. The modified nickel slag has activity, not only plays a role of a framework, but also plays a role of gelatinization, and tests show that the modified nickel slag can meet the specified requirements when being ground to 0.25mm, so that the consumption of energy, manpower, working hours and the like can be effectively reduced while the high-efficiency resource utilization of solid wastes is realized, the modified nickel slag does not need to be ground to the specified lower limit granularity, the dust and noise can be reduced in the production process, the pollution to the environment is reduced, and the equipment requirements on environmental protection equipment and personnel protection are effectively reduced.
Detailed Description
The present invention will be described in detail below with reference to various embodiments. The embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the embodiments are included in the scope of the present invention.
The following examples are given by way of illustration of the following materials unless otherwise specified, and are not intended to limit the scope of the invention in any way, as long as all materials meet the industry standards.
The method comprises the following steps:
cement: the P.O 42.5 ordinary portland cement has an apparent density of 3.12g/cm 3.
Fly ash: class 1 fly ash, apparent density 2.06g/cm 3.
River sand is medium sand with fineness modulus of 2.37, apparent density of 2.66g/cm3, bulk density of 1.47g/cm3, and water content of 0.45%.
Nickel slag: the chemical components of the blast furnace nickel slag are shown in Table 01.
Water reducing agent: a sulfonated melamine high-efficiency water reducing agent.
Fiber: glass fibers. The monofilament has a diameter of 14 μm, a length of 3-6mm, a density of 2.61g/cm3, a tensile strength of 3200-3800MPa and an elastic modulus of 75-79 GPa. The mixing amount is 0.2 percent of the total mass of the mortar.
Styrene-acrylic polymer: styrene-acrylic emulsion and water were mixed in a ratio of 1.2: 2, then atomized by a sprayer and sent into the rotating drum with wind.
Water: tap water.
TABLE 01 Main chemical composition of Nickel slag (%)
CaO MgO Al2O3 SiO2 Fe2O3 SO3 K2O Na2O Loss Total
32.14 12.62 17.48 26.86 3.64 2.47 0.42 0.62 1.60 97.85
Comparative example group one (1 part by weight in this comparative example is 1g, the same applies hereinafter)
TABLE 10 test mix ratio of dry-mixed mortar
Figure BDA0002463849860000051
Figure BDA0002463849860000061
1. Stability test:
1) the test method comprises the following steps:
placing a 25 mm-280 mm test mold on a vibrating table, pouring the freshly mixed nickel slag mortar into the mold, vibrating until no bubbles escape, placing the mold in a curing chamber for 24 hours, then removing the mold, measuring the initial length L0, then placing the test piece into a boiling box to boil for 3 hours, then placing the test piece into a 2MPa autoclave to steam for 3 hours, measuring the length L1, and the pressure steam expansion rate of the test piece is
Figure BDA0002463849860000062
In the formula: l is the effective length of the test piece, 250 mm.
Hereinafter, the test methods of the present invention including, but not limited to, the stability test of the embodiment exemplified in the examples/comparative examples are all adopted in the present embodiment.
2) Results
TABLE 20 stability of nickel slag mortar
Figure BDA0002463849860000063
Figure BDA0002463849860000071
2. Water absorption test
TABLE 30 mortar Water absorption test results (mg/cm) at different nickel slag sand substitution rates2)
Numbering 30min 1h 6h 48h 72h
0 33 50 110 231 258
1 34 64 104 257 262
2 42 68 129 284 297
3 45 77 172 333 345
4 45 78 176 399 412
5 38 68 110 271 280
6 45 76 131 302 321
7 45 81 182 353 361
8 46 82 187 427 440
9 37 65 112 270 287
10 41 74 132 307 325
11 48 76 188 357 370
12 48 84 191 429 444
3. Flexural strength
Table 40 flexural strength of mortar
Figure BDA0002463849860000072
Figure BDA0002463849860000081
4. Compressive strength
TABLE 50 compressive strength of mortar
Figure BDA0002463849860000082
Figure BDA0002463849860000091
Example group one (in this example 1 part by weight is 1 g)
TABLE 11 test mix ratio of dry-mixed mortar
Figure BDA0002463849860000092
1. Stability test:
1) the test method comprises the following steps:
as above.
2) Results
TABLE 12 stability of the nickel slag mortar
Numbering 0 1 2 3 4
Swelling rate/%) 0.002 0.086 0.091 0.116 0.136
Appearance of the product Surface integrity Surface integrity Surface integrity Surface integrity Surface integrity
Results Qualified Qualified Qualified Qualified Qualified
Along with the increase of the mixing amount of the nickel slag sand, the expansion rate is continuously improved, but the stability always meets the requirement.
2. Water absorption test
TABLE 13 mortar Water absorption test results (mg/cm) at different nickel slag sand substitution rates2)
Figure BDA0002463849860000093
Figure BDA0002463849860000101
Due to the porous structure of the nickel slag sand, the water absorption is larger than that of natural river sand. The water absorption of 72 hours is 2 times of that of river sand, but the water absorption of 1 hour always meets the specification requirement (the water absorption of 1 hour is less than or equal to 100mg/cm2)
3. Flexural strength
Table 14 flexural strength of mortar
Numbering 7d 28d
0 2.89 6.10
1 3.17 7.01
2 3.34 7.19
3 3.59 7.37
4 3.40 7.12
Because the nickel slag sand has activity, the nickel slag sand can generate hydration reaction to generate a product with gelling property, and the breaking strength of the product is greater than that of river sand mortar, which shows that the nickel slag mortar has stronger anti-cracking performance.
4. Compressive strength
TABLE 15 compressive strength of mortar
Numbering 7d 28d
0 6.1 10.1
1 6.9 12.2
2 7.6 13.4
3 8.1 14.4
4 7.7 13.1
The strength of the modified nickel slag mortar is greater than that of river sand.
In this example group, the styrene-acrylic polymer solution was styrene-acrylic, hydroxyethyl methacrylate and water in a ratio of 50: 1: 250, and continuously stirring at 80 ℃ for 5 hours to prepare and finally prepare the obtained emulsion with the solid content of 4.2%. The styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1: 2 when mixed. In addition, when the styrene-acrylic polymer is styrene-acrylic emulsion and water according to the mass ratio of 1.5: 2 when the mixture is obtained; the styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1.3: 2 the aforementioned performance conclusions can be met when the blend is obtained in the same situation.
EXAMPLE two (in this example 1 part by weight is 1 g)
TABLE 21 test mix ratio of dry-mixed mortar
Figure BDA0002463849860000111
1. Stability test:
1) the test method comprises the following steps:
as above.
2) Results
TABLE 22 stability of the nickel slag mortar
Figure BDA0002463849860000112
Figure BDA0002463849860000121
Along with the increase of the mixing amount of the nickel slag sand, the expansion rate is continuously improved, but the stability always meets the requirement.
2. Water absorption test
TABLE 23 mortar Water absorption test results (mg/cm) at different nickel slag sand substitution rates2)
Numbering 30min 1h 6h 48h 72h
0 32 51 106 225 239
1 35 65 124 302 312
2 43 75 152 340 358
3 48 80 209 390 406
4 49 84 209 474 493
5 33 56 114 245 265
6 40 75 135 332 351
7 49 80 164 376 393
8 54 89 230 431 451
Due to the porous structure of the nickel slag sand, the water absorption is larger than that of natural river sand. The water absorption of 72 hours is 2 times of that of river sand, but the water absorption of 1 hour always meets the specification requirement (the water absorption of 1 hour is less than or equal to 100mg/cm2)
3. Flexural strength
Table 24 flexural strength of mortar
Figure BDA0002463849860000122
Figure BDA0002463849860000131
Because the nickel slag sand has activity, the nickel slag sand can generate hydration reaction to generate a product with gelling property, and the breaking strength of the product is greater than that of river sand mortar, which shows that the nickel slag mortar has stronger anti-cracking performance.
4. Compressive strength
TABLE 25 compressive strength of mortar
Numbering 7d 28d
0 5.57 9.29
1 6.52 11.05
2 7.17 12.76
3 7.23 13.69
4 6.96 12.08
5 6.46 11.49
6 7.52 12.43
7 7.60 13.88
8 7.22 12.85
The strength of the modified nickel slag mortar is greater than that of river sand.
In this example group, the styrene-acrylic polymer solution was styrene-acrylic, hydroxyethyl methacrylate and water in a ratio of 50: 1: 250, and continuously stirring at 80 ℃ for 5 hours to prepare and finally prepare the obtained emulsion with the solid content of 4.2%. The styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1: 2 when mixed. In addition, when the styrene-acrylic polymer is styrene-acrylic emulsion and water according to the mass ratio of 1.5: 2 when the mixture is obtained; the styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1.3: 2 the aforementioned performance conclusions can be met when the blend is obtained in the same situation.
EXAMPLE III (in this example 1 part by weight is 1 g)
TABLE 31 test mix ratio of dry-mixed mortar
Figure BDA0002463849860000141
1. Stability test:
1) the test method comprises the following steps:
as above.
2) Results
TABLE 32 stability of the nickel slag mortar
Numbering 0 1 2 3 4
Swelling rate/%) 0.004 0.094 0.114 0.132 0.149
Appearance of the product Surface integrity Surface integrity Surface integrity Surface integrity Surface integrity
Results Qualified Qualified Qualified Qualified Qualified
Numbering 5 6 7 8
Swelling rate/%) 0.102 0.111 0.124 0.161
Appearance of the product Surface integrity Surface integrity Surface integrity Surface integrity
Results Qualified Qualified Qualified Qualified
Along with the increase of the mixing amount of the nickel slag sand, the expansion rate is continuously improved, but the stability always meets the requirement.
2. Water absorption test
TABLE 33 mortar Water absorption test results (mg/cm) at different nickel slag sand substitution rates2)
Numbering 30min 1h 6h 48h 72h
0 30 48 109 229 250
1 32 64 132 315 329
2 45 72 154 354 372
3 44 74 214 409 425
4 47 83 217 496 510
5 34 51 119 257 280
6 38 69 146 347 363
7 45 77 175 395 411
8 49 84 241 450 468
Due to the porous structure of the nickel slag sand, the water absorption is larger than that of natural river sand. The water absorption of 72 hours is 2 times of that of river sand, but the water absorption of 1 hour always meets the specification requirement (the water absorption of 1 hour is less than or equal to 100mg/cm2)
3. Flexural strength
Flexural strength of surface 34 mortar
Figure BDA0002463849860000151
Figure BDA0002463849860000161
Because the nickel slag sand has activity, the nickel slag sand can generate hydration reaction to generate a product with gelling property, and the breaking strength of the product is greater than that of river sand mortar, which shows that the nickel slag mortar has stronger anti-cracking performance.
4. Compressive strength
TABLE 35 compressive strength of mortar
Numbering 7d 28d
0 5.71 9.221
1 6.56 11.22
2 7.01 12.11
3 7.25 13.02
4 7.29 11.84
5 6.39 11.46
6 7.45 12.38
7 7.52 13.31
8 7.35 12.39
The strength of the modified nickel slag mortar is greater than that of river sand.
In this example group, the styrene-acrylic polymer solution was styrene-acrylic, hydroxyethyl methacrylate and water in a ratio of 50: 1: 250, and continuously stirring at 80 ℃ for 5 hours to prepare and finally prepare the obtained emulsion with the solid content of 4.2%. The styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1: 2 when mixed. In addition, when the styrene-acrylic polymer is styrene-acrylic emulsion and water according to the mass ratio of 1.5: 2 when the mixture is obtained; the styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1.3: 2 the aforementioned performance conclusions can be met when the blend is obtained in the same situation.
EXAMPLE four (in this example 1 part by weight is 1 g)
TABLE 41 test mixing ratio of dry-mixed mortar
Figure BDA0002463849860000171
1. Stability test:
1) the test method comprises the following steps:
as above.
2) Results
TABLE 42 stability of the nickel slag mortar
Figure BDA0002463849860000172
Figure BDA0002463849860000181
Along with the increase of the mixing amount of the nickel slag sand, the expansion rate is continuously improved, but the stability always meets the requirement.
2. Water absorption test
TABLE 43 mortar Water absorption test results (mg/cm) at different substitution rates of nickel slag sand2)
Numbering 30min 1h 6h 48h 72h
0 33 47 105 221 241
1 35 64 122 300 310
2 42 70 146 334 352
3 44 75 203 385 404
4 49 80 207 470 485
5 40 74 138 331 342
6 47 80 164 375 392
7 49 87 228 432 447
8 52 90 232 524 536
9 38 69 134 320 337
10 46 79 163 363 385
11 52 84 221 420 435
12 54 90 222 510 524
Due to the porous structure of the nickel slag sand, the water absorption is larger than that of natural river sand. The water absorption of 72 hours is 2 times of that of river sand, but the water absorption of 1 hour always meets the specification requirement (the water absorption of 1 hour is less than or equal to 100mg/cm2)
3. Flexural strength
Flexural strength of surface 44 mortar
Numbering 7d 28d
0 2.77 5.77
1 3.00 6.63
2 3.17 6.80
3 3.38 6.97
4 3.23 6.73
5 3.01 6.71
6 3.17 6.88
7 3.45 7.06
8 3.27 6.80
9 3.02 6.65
10 3.18 6.81
11 3.40 6.92
12 3.22 6.71
Because the nickel slag sand has activity, the nickel slag sand can generate hydration reaction to generate a product with gelling property, and the breaking strength of the product is greater than that of river sand mortar, which shows that the nickel slag mortar has stronger anti-cracking performance.
4. Compressive strength
TABLE 45 compressive strength of mortar
Figure BDA0002463849860000191
Figure BDA0002463849860000201
The strength of the modified nickel slag mortar is greater than that of river sand.
In this example group, the styrene-acrylic polymer solution was styrene-acrylic, hydroxyethyl methacrylate and water in a ratio of 50: 1: 250, and continuously stirring at 80 ℃ for 5 hours to prepare and finally prepare the obtained emulsion with the solid content of 4.2%. The styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1: 2 when mixed. In addition, when the styrene-acrylic polymer is styrene-acrylic emulsion and water according to the mass ratio of 1.5: 2 when the mixture is obtained; the styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1.3: 2 the aforementioned performance conclusions can be met when the blend is obtained in the same situation.
EXAMPLE group five (in this example 1 part by weight is 1 g)
TABLE 51 Dry-mixed mortar test mix proportion
Figure BDA0002463849860000202
Figure BDA0002463849860000211
1. Stability test:
1) the test method comprises the following steps:
as above.
2) Results
TABLE 52 stability of nickel slag mortar
Numbering 0 1 2 3 4
Swelling rate/%) 0.002 0.062 0.077 0.119 0.128
Appearance of the product Surface integrity Surface integrity Surface integrity Surface integrity Surface integrity
Results Qualified Qualified Qualified Qualified Qualified
Numbering 5 6 7 8
Swelling rate/%) 0.090 0.102 0.125 0.144
Appearance of the product Surface integrity Surface integrity Surface integrity Surface integrity
Results Qualified Qualified Qualified Qualified
Along with the increase of the mixing amount of the nickel slag sand, the expansion rate is continuously improved, but the stability always meets the requirement.
2. Water absorption test
TABLE 53 mortar Water absorption test results (mg/cm) at different substitution rates of nickel slag sand2)
Figure BDA0002463849860000212
Figure BDA0002463849860000221
Due to the porous structure of the nickel slag sand, the water absorption is larger than that of natural river sand. The water absorption of 72 hours is 2 times of that of river sand, but the water absorption of 1 hour always meets the specification requirement (the water absorption of 1 hour is less than or equal to 100mg/cm2)
3. Flexural strength
Table 54 flexural strength of mortar
Numbering 7d 28d
0 2.72 5.70
1 3.00 6.57
2 3.10 6.74
3 3.35 6.90
4 3.17 6.65
5 3.02 6.72
6 3.20 6.97
7 3.45 7.14
8 3.28 6.88
Because the nickel slag sand has activity, the nickel slag sand can generate hydration reaction to generate a product with gelling property, and the breaking strength of the product is greater than that of river sand mortar, which shows that the nickel slag mortar has stronger anti-cracking performance.
4. Compressive strength
Compressive strength of mortar in table 55
Figure BDA0002463849860000222
Figure BDA0002463849860000231
The strength of the modified nickel slag mortar is greater than that of river sand.
In this example group, the styrene-acrylic polymer solution was styrene-acrylic, hydroxyethyl methacrylate and water in a ratio of 50: 1: 250, and continuously stirring at 80 ℃ for 5 hours to prepare and finally prepare the obtained emulsion with the solid content of 4.2%. The styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1: 2 when mixed. In addition, when the styrene-acrylic polymer is styrene-acrylic emulsion and water according to the mass ratio of 1.5: 2 when the mixture is obtained; the styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1.3: 2 the aforementioned performance conclusions can be met when the blend is obtained in the same situation.
EXAMPLE six (in this example 1 part by weight is 1 g)
TABLE 61 Dry-mixed mortar test mixing ratio
Figure BDA0002463849860000232
1. Stability test:
1) the test method comprises the following steps:
as above.
2) Results
TABLE 62 stability of the nickel slag mortar
Numbering 0 1 2 3 4
Swelling rate/%) 0.005 0.087 0.079 0.113 0.122
Appearance of the product Surface integrity Surface integrity Surface integrity Surface integrity Surface integrity
Results Qualified Qualified Qualified Qualified Qualified
Numbering 5 6 7 8
Swelling rate/%) 0.080 0.083 0.115 0.130
Appearance of the product Surface integrity Surface integrity Surface integrity Surface integrity
Results Qualified Qualified Qualified Qualified
Along with the increase of the mixing amount of the nickel slag sand, the expansion rate is continuously improved, but the stability always meets the requirement.
2. Water absorption test
TABLE 63 mortar Water absorption test results (mg/cm) at different substitution rates of nickel slag sand2)
Numbering 30min 1h 6h 48h 72h
0 31 50 100 220 237
1 35 67 122 298 309
2 45 72 145 338 353
3 47 79 201 386 400
4 49 82 206 469 482
5 39 67 129 307 319
6 45 74 150 347 364
7 46 82 212 395 409
8 47 87 210 480 500
Due to the porous structure of the nickel slag sand, the water absorption is larger than that of natural river sand. The water absorption of 72 hours is 2 times of that of river sand, but the water absorption of 1 hour always meets the specification requirement (the water absorption of 1 hour is less than or equal to 100mg/cm2)
3. Flexural strength
Table 64 mortar flexural strength
Numbering 7d 28d
0 2.70 5.69
1 2.98 6.55
2 3.12 6.73
3 3.36 6.92
4 3.22 6.67
5 2.74 5.86
6 3.09 6.72
7 3.20 6.95
8 3.42 7.10
Because the nickel slag sand has activity, the nickel slag sand can generate hydration reaction to generate a product with gelling property, and the breaking strength of the product is greater than that of river sand mortar, which shows that the nickel slag mortar has stronger anti-cracking performance.
4. Compressive strength
TABLE 65 compressive strength of mortar
Figure BDA0002463849860000251
Figure BDA0002463849860000261
The strength of the modified nickel slag mortar is greater than that of river sand.
In this example group, the styrene-acrylic polymer solution was styrene-acrylic, hydroxyethyl methacrylate and water in a ratio of 50: 1: 250, and continuously stirring at 80 ℃ for 5 hours to prepare and finally prepare the obtained emulsion with the solid content of 4.2%. The styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1: 2 when mixed. In addition, when the styrene-acrylic polymer is styrene-acrylic emulsion and water according to the mass ratio of 1.5: 2 when the mixture is obtained; the styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1.3: 2 the aforementioned performance conclusions can be met when the blend is obtained in the same situation.
EXAMPLE group seven (in this example 1 part by weight is 1 g)
TABLE 71 test mixing ratio of dry-mixed mortar
Figure BDA0002463849860000262
1. Stability test:
1) the test method comprises the following steps:
as above.
2) Results
TABLE 72 stability of the nickel slag mortar
Numbering 0 1 2 3 4
Swelling rate/%) 0.003 0.079 0.092 0.105 0.126
Appearance of the product Surface integrity Surface integrity Surface integrity Surface integrity Surface integrity
Results Qualified Qualified Qualified Qualified Qualified
Numbering 5 6 7 8
Swelling rate/%) 0.085 0.091 0.116 0.137
Appearance of the product Surface integrity Surface integrity Surface integrity Surface integrity
Results Qualified Qualified Qualified Qualified
Along with the increase of the mixing amount of the nickel slag sand, the expansion rate is continuously improved, but the stability always meets the requirement.
2. Water absorption test
TABLE 73 mortar Water absorption test results (mg/cm) at different nickel slag sand substitution rates2)
Numbering 30min 1h 6h 48h 72h
0 32 50 100 222 237
1 35 66 122 299 310
2 46 74 145 337 352
3 49 77 207 386 401
4 49 86 206 469 487
5 37 68 130 311 325
6 44 77 152 349 365
7 47 79 214 402 417
8 48 90 217 490 507
Due to the porous structure of the nickel slag sand, the water absorptivityNatural river sand is large. The water absorption of 72 hours is 2 times of that of river sand, but the water absorption of 1 hour always meets the specification requirement (the water absorption of 1 hour is less than or equal to 100mg/cm2)
3. Flexural strength
Flexural strength of surface 74 mortar
Numbering 7d 28d
0 2.70 5.75
1 2.95 6.64
2 3.12 6.74
3 3.40 6.92
4 3.19 6.71
5 3.14 6.84
6 3.23 7.05
7 3.50 7.19
8 3.30 6.97
Because the nickel slag sand has activity, the nickel slag sand can generate hydration reaction to generate a product with gelling property, and the breaking strength of the product is greater than that of river sand mortar, which shows that the nickel slag mortar has stronger anti-cracking performance.
4. Compressive strength
Compressive strength of mortar shown in Table 75
Figure BDA0002463849860000281
Figure BDA0002463849860000291
The strength of the modified nickel slag mortar is greater than that of river sand.
In this example group, the styrene-acrylic polymer solution was styrene-acrylic, hydroxyethyl methacrylate and water in a ratio of 50: 1: 250, and continuously stirring at 80 ℃ for 5 hours to prepare and finally prepare the obtained emulsion with the solid content of 4.2%. The styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1: 2 when mixed. In addition, when the styrene-acrylic polymer is styrene-acrylic emulsion and water according to the mass ratio of 1.5: 2 when the mixture is obtained; the styrene-acrylic polymer is prepared from styrene-acrylic emulsion and water according to a mass ratio of 1.3: 2 the aforementioned performance conclusions can be met when the blend is obtained in the same situation.
In the above-mentioned aspects, the styrene-acrylic polymer emulsion can also meet the requirements of the implementation of the embodiment of the invention by adopting the following aspects, including but not limited to, styrene-acrylic, hydroxyethyl methacrylate and water according to the ratio of 40: 1: 250, and continuously stirring for 5 hours at 70 ℃ to prepare an emulsion with the solid content of 3%; styrene-acrylic, hydroxyethyl methacrylate and water were mixed according to a 45: 1: 250, and continuously stirring for 6 hours at 90 ℃ to prepare an emulsion with the solid content of 6%; styrene-acrylic, hydroxyethyl methacrylate and water were as follows 47: 1: 250, and stirring at 85 ℃ for 5.5 hours to prepare an emulsion with a solid content of 5%.
In the scheme including but not limited to the above scheme, the treatment of the nickel slag sand raw sand by the styrene-acrylic polymer can also be realized by spraying a styrene-acrylic polymer solution accounting for 2% of the mass of the nickel slag sand on the surface of the nickel slag sand raw sand and stirring, and the requirements including but not limited to the technical scheme of the embodiment can also be met. Of course, when the dosage of the styrene-acrylic polymer solution is 3% or 5% or 6% of the nickel slag sand, the requirement is also met, and the description is not repeated here.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. The polymer modified nickel slag sand anti-cracking dry-mixed mortar comprises the following raw materials in parts by weight:
462 and 693 parts by weight of river sand;
77-308 parts of nickel slag sand;
200 portions of cement and 300 portions of cement;
3-10 parts of a water reducing agent;
150 portions of water and 200 portions of water;
wherein the dosage of the nickel slag sand is not more than 40 percent of the total mass of the river sand and the nickel slag sand, and the nickel slag sand is obtained by sequentially carrying out alkali activator treatment and styrene-acrylic polymer treatment on raw nickel slag sand.
2. The polymer modified nickel slag sand anti-cracking dry-mixed mortar of claim 1, wherein the nickel slag sand is a continuous graded nickel slag sand with a particle size of 0.25mm-4.75 mm.
3. The polymer modified nickel slag sand anti-cracking dry-mixed mortar according to claim 1, wherein the raw materials further comprise 5-30 parts by weight of lignin fiber.
4. The polymer modified nickel slag sand anti-cracking dry-mixed mortar according to claim 1, 2 or 3, wherein the raw materials further comprise glass fibers in an amount of 0.1-0.4% of the total mass of the dry-mixed mortar.
5. The polymer modified nickel slag sand anti-cracking dry-mixed mortar of claim 4, wherein the raw materials further comprise 40-60kg/m of dry-mixed mortar3Fly ash.
6. The polymer modified nickel slag sand anti-cracking dry-mixed mortar according to claim 1, wherein the styrene-acrylic polymer is used for treating the nickel slag sand raw sand by spraying a styrene-acrylic polymer solution on the surface of the nickel slag sand raw sand and stirring.
7. The polymer modified nickel slag sand anti-cracking dry-mixed mortar according to claim 1 or 5, wherein the styrene-acrylic polymer is a styrene-acrylic emulsion and water according to a mass ratio (1-1.5): 2, mixing to obtain the product.
8. The polymer modified nickel slag sand anti-cracking dry-mixed mortar according to claim 1, wherein the alkali activator is NaOH or KOH.
9. The polymer modified nickel slag sand anti-cracking dry-mixed mortar according to claim 1 or 7, wherein the amount of the alkali-activator is 4-8% of the mass of the nickel slag sand.
10. The polymer-modified nickel slag sand anti-cracking dry-mixed mortar of claim 1, wherein the water reducing agent is a sulfonated melamine high-efficiency water reducing agent.
CN202010327826.4A 2020-04-23 2020-04-23 Polymer modified nickel slag sand anti-cracking dry-mixed mortar Withdrawn CN111362644A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103626440A (en) * 2013-12-04 2014-03-12 桂林理工大学 Dry-mixed mortar prepared from hot furnace slag and preparation method of dry-mixed mortar
CN103693908A (en) * 2013-12-04 2014-04-02 上海宝冶钢渣综合开发实业有限公司 Inorganic coating mortar taking ore smelting slag as main raw material and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN103626440A (en) * 2013-12-04 2014-03-12 桂林理工大学 Dry-mixed mortar prepared from hot furnace slag and preparation method of dry-mixed mortar
CN103693908A (en) * 2013-12-04 2014-04-02 上海宝冶钢渣综合开发实业有限公司 Inorganic coating mortar taking ore smelting slag as main raw material and preparation method thereof

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