CN111377692A - Premixed floor mortar - Google Patents
Premixed floor mortar Download PDFInfo
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- CN111377692A CN111377692A CN202010336014.6A CN202010336014A CN111377692A CN 111377692 A CN111377692 A CN 111377692A CN 202010336014 A CN202010336014 A CN 202010336014A CN 111377692 A CN111377692 A CN 111377692A
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- machine
- mortar
- made sand
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Classifications
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/60—Flooring materials
-
- 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 invention discloses premixed floor mortar, which belongs to the field of building materials, and the technical scheme is characterized in that the mortar comprises the following raw materials in parts by weight: 250 portions of cement 230-; the machine-made sand is processed by cobblestones with the grain diameter of less than 3cm, the machine-made sand grading is II-zone grading, and the effect of ensuring that the mortar has good compressive strength and construction performance after the machine-made sand replaces river sand is achieved.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to premixed floor mortar.
Background
The existing floor mortar is a powdery mixture prepared by mixing fine aggregate, a quantitative cementing material and various high-performance trace additives according to a certain proportion, and when the floor mortar is used, only water needs to be added for mixing.
The fine aggregate in the existing floor mortar mainly adopts river sand, and the surface of the river sand has certain smoothness and more impurity content due to the fact that the river sand is washed away by water for a long time, but the raw materials of the river sand are gradually reduced along with the exploitation of the river sand, so that machine-made sand is gradually used for replacing the river sand in the prior art. However, the existing machine-made sand has a rough surface, and the compressive strength and the workability of the mortar are reduced after the machine-made sand replaces river sand, so that the use of the machine-made sand is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the ready-mixed terrace mortar, so that the effect of ensuring the mortar to have good compressive strength and construction performance after mechanical sand replaces river sand is achieved.
The technical purpose of the invention is realized by the following technical scheme:
the ready-mixed floor mortar comprises the following raw materials in parts by weight: 250 portions of cement 230-.
By adopting the technical scheme, the machine-made sand has uniform particles, good particle shape, few edges and corners, almost round shape and no sheet shape, so that after the machine-made sand replaces natural river sand, the exploitation of energy is reduced, and meanwhile, experiments prove that the effect same as that of the natural river sand can be achieved. Compared with natural river sand, the mechanism sand is rough in surface, lead to the peaceability of mortar to be relatively poor, cause the appearance quality defect of mortar easily, simultaneously because the surface of mechanism sand is compared in the surface of natural river sand and is rough some, thereby be favorable to the bonding of cementitious material such as cement, improve the intensity of cement mortar, in the application, the cooperation of admixture and water-reducing agent is used, not only can effectively improve the workability of mortar, reduce the appearance quality problem that arouses because of the mortar surface is rough, also can effectively compensate the compressive strength of mortar simultaneously, make the mortar that adopts mechanism sand to replace natural river sand have good working property and compressive strength. Therefore, the machine-made sand replaces the natural river sand, thereby not only solving the environmental problem but also improving the utilization rate of natural resources.
The invention is further set that the mortar comprises the following raw materials in parts by weight: 245 parts of cement 235-1390 parts of machine-made sand 1300-1390 parts of water 190-210 parts of admixture and 2.2-2.6 parts of water reducing agent.
By adopting the technical scheme, when the content of the components of the mortar is within the range, the construction performance of the mortar can be further improved, so that the machined sand is ensured to have good compressive strength.
The invention further provides that the admixture comprises a plasticizer and a retarder.
Through adopting above-mentioned technical scheme, the cooperation of plasticizing agent and retarder is used, keeps the mortar consistency the same under the circumstances, can reduce the water quantity of mixing of mortar for the mortar is more closely knit, improves the compressive strength of each age of mortar, can also make the mortar have good workability simultaneously. In addition, plasticizer adds the back, can effectively prevent that the mortar adhesion from whetting a knife, at the floating in-process, can be more smooth and easy, reduces the engineering time to can reduce construction cost.
The invention further provides that the weight ratio of the plasticizer to the retarder is (0.3-0.6): (1.1-1.4).
Through adopting above-mentioned technical scheme, when the weight ratio of plasticizing agent and retarder was in this within range, not only can guarantee that the mortar has good workability, can also guarantee simultaneously that the mortar has good compressive strength, when the volume of plasticizing agent was in this within range, can effectively guarantee the compressive strength of mortar, when the plasticizing agent dosage was too high, can make the compressive strength of mortar reduce.
The invention is further configured such that the retarder comprises sodium gluconate and white sugar.
The invention is further set that the weight ratio of the sodium gluconate to the white sugar is (0.7-1.1): (0.6-1.2).
Through adopting above-mentioned technical scheme, the retarder adopts the cooperation of sodium gluconate and white sugar to use the back, can effectively control the initial set time of mortar, guarantee that the mortar has good workability, simultaneously because the stability of white sugar is poor than the stability of sodium gluconate, when winter, the use amount of white sugar will reduce, its use amount increases when summer, it is convenient like this to provide the construction, the compressive strength of mortar both can have been improved in the cooperation use of the two, the cooperation of the two is used simultaneously, can make cement mortar have suitable retardation time, reduce the water consumption, it is convenient to bring for the construction, also can reduce the cost of mortar simultaneously.
The invention is further set that the machine-made sand is processed by cobblestones with the grain diameter of less than 3cm, and the machine-made sand grading is that the fineness modulus of the machine-made sand of the II-zone grading is 2.3-2.6.
By adopting the technical scheme, when the machine-made sand is processed by adopting cobblestones with the thickness less than 3cm, the quality of the machine-made sand is guaranteed in terms of materials, and meanwhile, the cobblestones are harder than limestone, so that the compressive strength of the mortar after the machine-made sand replaces natural river sand is guaranteed. In addition, after the machine-made sand adopts II-zone gradation, the grain gradation is good; when the fineness modulus of the machine-made sand is within the range of 2.3-2.6, the machine-made sand is uniform in granularity, the machine-made sand is prevented from influencing the construction performance of the mortar due to too coarse or too fine machine-made sand grains, and meanwhile, after the machine-made sand grains are uniformly distributed, gaps among the grains can be effectively filled with cement, so that the mortar is ensured to have good compressive strength.
The invention is further set that the machine-made sand has 4.75 mesh screen allowance of 0, the screen bottom content of the mesh screen below 0.075mm is 5-8%, the methylene blue index is 0.3-1.0, and the crushing index value is less than 10%.
By adopting the technical scheme, when the methylene blue index of the machine-made sand is 0.3-1.0, the mud content in the machine-made sand is very low, and the quality of the machine-made sand is better, when the screen allowance of the machine-made sand in a 4.75 sieve mesh is 0, the machine-made sand in the invention is uniform in particle size, the particle shape of the machine-made sand is close to a circular shape, and no flaky result exists, so that the construction performance and the compressive strength of the machine-made sand can be effectively improved, and when the screen bottom content of the sieve mesh below 0.075mm is 5-8%, the stone powder content in the machine-made sand is low, and meanwhile, the grading of the machine-made sand particles in the invention can be kept in a region II, so that the compressive strength of the mortar is effectively.
The invention is further configured that the apparent density of the machine-made sand is 2650-2680kg/m3Bulk density 1520-3。
By adopting the technical scheme, the larger the apparent density and loose bulk density is, the better the compaction performance of the machine-made sand is, so that the compressive strength of the cement mortar is also improved.
In conclusion, the invention has the following beneficial effects:
1. the invention replaces natural river sand with machine-made sand, and uses the machine-made sand, the admixture and the water reducing agent together, so that the cement mortar has the compressive strength basically same as that of the cement mortar adopting the natural river sand, and simultaneously, the fluidity of the cement mortar in the application is superior to that of the cement mortar adopting the natural river sand, which indicates that the construction performance of the cement mortar is improved by using the machine-made sand together with the admixture and the water reducing agent, and the water consumption and the cement consumption of the cement mortar are reduced after the machine-made sand replaces the natural river sand, thereby effectively reducing the construction cost;
2. after the plasticizer and the retarder are adopted as the additive, the defect of poor construction performance caused by rough surface of the machine-made sand is effectively overcome, and meanwhile, the cement can effectively fill gaps among the machine-made sand particles, the bonding performance among the machine-made sand particles of the cement paste is improved, and the compressive strength of the mortar is improved;
3. the fineness modulus of the machine-made sand is within the range of 2.3-2.6, and the methylene blue index is 0.3-1.0, so that the machine-made sand is uniform in particle shape, nearly circular in particle shape and free of flaky structures, and the content of mud powder is low, so that the quality of the machine-made sand is effectively guaranteed, and the strength of the machine-made sand during use is improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
The sources of the raw materials in the following examples and comparative examples are:
the cement is 42.5R ordinary Portland cement in the east of Jasminum grandiflorum Heng, and the compressive strength is actually measured to be about 46.7MPa in 28 days; the rupture strength is 8.5MPa in 28 days; initial setting time is 154min, final setting time is 251min, water consumption of standard consistency is 27.2%, and stability (Raynaud's clamp method) is 2.5 mm;
the machine-made sand is produced by TUNNONG commercial concrete company Limited, the void ratio is 40 percent, and the mud content is 0.5 percent;
plasticizers were purchased from chuanhan science ltd;
white sugar was purchased from Shuangjiang south China sugar industry Co., Ltd;
sodium gluconate was purchased from Shandong West King sugar industry Co Ltd
The water reducing agent is a polycarboxylic acid water reducing agent and is purchased from Chongqing stone doctor new material company Limited.
Example 1
A ready-mixed floor mortar comprises the following components: 230g of cement, 1280g of machine-made sand, 180g of water, 1.7g of additive and 2.0g of water reducing agent; the admixture comprises a plasticizer and a retarder, and the weight ratio of the plasticizer to the retarder is 0.3: 1.1, namely 0.36g of plasticizer and 1.34g of retarder; the retarder comprises sodium gluconate and white sugar, and the weight ratio of the sodium gluconate to the white sugar is 0.7: 1.2, namely 0.49g of sodium gluconate and 0.85g of white sugar;
the allowance of a sieve with 4.75mm sieve pores for the machine-made sand is 0; the sieve bottom content of sieve pores with the diameter of less than 0.075mm is 5%, the methylene blue index is 0.3, and the crushing index value is 9%; the fineness modulus of the machine-made sand is 2.3, and the apparent density of the machine-made sand is 2650kg/m3Bulk density 1520kg/m3。
Example 2
A ready-mixed floor mortar comprises the following components: 235g of cement, 1300g of machine-made sand, 190g of water, 1.8g of an additive and 2.2g of a water reducing agent; the admixture comprises a plasticizer and a retarder, and the weight ratio of the plasticizer to the retarder is 0.4: 1.1, namely 0.48g of plasticizer and 1.32g of retarder; the retarder comprises sodium gluconate and white sugar, and the weight ratio of the sodium gluconate to the white sugar is 0.7: 1.2, 0.49g of sodium gluconate and 0.83g of white sugar;
the allowance of a sieve with 4.75mm sieve pores for the machine-made sand is 0; the sieve bottom content of sieve pores with the diameter of less than 0.075mm is 5%, the methylene blue index is 0.3, and the crushing index value is 9%; the fineness modulus of the machine-made sand is 2.4, and the apparent density of the machine-made sand is 2660kg/m3Bulk density 1530kg/m3。
Example 3
A ready-mixed floor mortar comprises the following components: 240g of cement, 1360g of machine-made sand, 200g of water, 2.0g of an additive and 2.4g of a water reducing agent; the admixture comprises a plasticizer and a retarder, and the weight ratio of the plasticizer to the retarder is 0.5: 1.2, namely 0.59g of plasticizer and 1.41g of retarder; the retarder comprises sodium gluconate and white sugar, and the weight ratio of the sodium gluconate to the white sugar is 0.9: 1.0 g of sodium gluconate 0.67g and white sugar 0.74 g;
the allowance of a sieve with 4.75mm sieve pores for the machine-made sand is 0; sieve with sieve hole below 0.075mmA base content of 6%, a methylene blue index of 0.5, and a crush index value of 7%; the fineness modulus of the machine-made sand is 2.4, and the apparent density of the machine-made sand is 2670kg/m3Loose bulk density of 1540kg/m3。
Example 4
A ready-mixed floor mortar comprises the following components: 245g of cement, 1390g of machine-made sand, 210g of water, 2.5g of an additive and 2.6g of a water reducing agent; the admixture comprises a plasticizer and a retarder, and the weight ratio of the plasticizer to the retarder is 0.5: 1.4, namely 0.66g of plasticizer and 1.84g of retarder, wherein the retarder comprises sodium gluconate and white sugar, and the weight ratio of the sodium gluconate to the white sugar is 1.1: 0.6, namely 1.19g of sodium gluconate and 0.65g of white sugar;
the allowance of a sieve with 4.75mm sieve pores for the machine-made sand is 0; the sieve bottom content of sieve pores with the diameter of less than 0.075mm is 8%, the methylene blue index is 0.5, and the crushing index value is 8%; the fineness modulus of the machine-made sand is 2.5, and the apparent density of the machine-made sand is 2670kg/m3Loose bulk density of 1540kg/m3。
Example 5
A ready-mixed floor mortar comprises the following components: 250g of cement, 1420g of machine-made sand, 220g of water, 2.6g of an additive and 2.8g of a water reducing agent; the admixture comprises a plasticizer and a retarder, and the weight ratio of the plasticizer to the retarder is 0.6: 1.4, namely 0.78g of plasticizer and 1.82g of retarder, wherein the retarder comprises sodium gluconate and white sugar, and the weight ratio of the sodium gluconate to the white sugar is 1.1: 0.6, namely 1.18g of sodium gluconate and 0.64g of white sugar;
the allowance of a sieve with 4.75mm sieve pores for the machine-made sand is 0; the sieve bottom content of sieve pores with the diameter of less than 0.075mm is 8%, the methylene blue index is 1.0, and the crushing index value is 7%; the fineness modulus of the machine-made sand is 2.6, and the apparent density of the machine-made sand is 2680kg/m3Loose bulk density 1550kg/m3。
Comparative example 1
The difference from the embodiment 3 is that 294g of cement, 1413g of natural river sand, 284g of water, 0.59g of plasticizer, 0.67g of sodium gluconate, 0.74g of white sugar and 2.4g of water reducer.
Comparative example 2
The difference from example 3 is that no admixture is present in the starting materials.
Comparative example 3
The difference from example 3 is that only sodium gluconate was used as the retarder.
Comparative example 4
The difference from example 3 is that the retarder used was only white sugar.
Comparative example 5
The difference from example 3 was that the plasticizer content was 0.81g and the retarder content was 1.19 g.
Performance detection
The M15 mortars obtained in examples 1-5 and comparative examples 1-4 were tested for compressive strength, consistency and setting time according to the method and standard requirements of JGJ/T98-2010, and the test results are shown in Table 1.
TABLE 1 mortar test results table
| Item | Compressive strength/MPa for 7 days | 28 day compressive strength/MPa | Consistency/mm | Initial setting time/min | Final setting time/min |
| Example 1 | 15.4 | 18.3 | 81 | 650 | 820 |
| Example 2 | 15.5 | 18.5 | 82 | 710 | 870 |
| Example 3 | 15.7 | 18.7 | 83 | 780 | 950 |
| Example 4 | 15.7 | 18.6 | 82 | 830 | 1010 |
| Example 5 | 15.6 | 18.4 | 80 | 880 | 1050 |
| Comparative example 1 | 15.2 | 18.6 | 65 | 740 | 900 |
| Comparative example 2 | 13.2 | 15.8 | 55 | 410 | 550 |
| Comparative example 3 | 14.1 | 15.2 | 66 | 580 | 720 |
| Comparative example 4 | 14.2 | 15.0 | 64 | 640 | 770 |
| Comparative example 5 | 14.8 | 16.4 | 72 | 660 | 850 |
From the above table, it can be seen that:
compared with the comparative example 1, the 7-day compressive strength of the cement mortar in the application is superior to that of the natural river sand in the comparative example 1, and the 28-day compressive strength of the cement mortar in the application is basically close to that of the comparative example 1, so that the 7-day compressive strength of the mortar can be effectively ensured after the mechanical sand is used for replacing the natural river sand, meanwhile, the 28-day compressive strength of the example 3 is superior to that of the comparative example 1, so that the matching use of the components in the application can achieve the compressive strength which is basically the same as the natural river sand and even better than the natural river sand, and the consistency of the examples 1-5 in the application is superior to that of the comparative example 1, so that the mortar in the application has good fluidity, and the good construction performance is effectively ensured, meanwhile, the initial setting time of the mortar in the embodiments 1-5 is more than 10 hours, so that convenience is brought to construction;
compared with the embodiment 3, when the cement mortar is lack of the additive, the data of the comparative example 2 shows that the compressive strength of the mortar is reduced, and the consistency is reduced by 33.7% compared with that of the embodiment 3, therefore, the addition of the additive not only affects the fluidity of the cement mortar, but also affects the compressive strength of the cement mortar, and the fluidity of the mortar is obviously reduced due to the rough surface of the machine-made sand, so that pores can be formed in the mortar during the construction process, the compressive strength of the mortar is reduced, and after the additive is added, the mortar can be ensured to have good construction performance, and the compressive strength of the mortar is improved;
compared with the example 3, when the retarder only adopts white sugar or sodium gluconate, the compressive strength, the consistency and the setting time of the mortar are reduced compared with those of the mortar in the example 3, which shows that the matching use of the white sugar and the sodium gluconate can not only ensure that the mortar has good compressive strength, but also ensure that the mortar has good construction performance.
Comparative example 5 compared with example 3, the compressive strength and consistency of comparative example 5 are reduced, and the initial setting time and the final setting time are shortened, so that the higher the amount of the plasticizer is, the lower the mortar strength is, and the higher the amount of the retarder is, the compressive strength of the mortar is affected.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. The ready-mixed floor mortar is characterized by comprising the following raw materials in parts by weight: 250 portions of cement 230-.
2. The ready-mixed floor mortar according to claim 1, characterized in that: the mortar comprises the following raw materials in parts by weight: 245 parts of cement 235-1390 parts of machine-made sand 1300-1390 parts of water 190-210 parts of admixture and 2.2-2.6 parts of water reducing agent.
3. The ready-mixed floor mortar according to claim 1 or 2, wherein: the admixture comprises a plasticizer and a retarder.
4. The ready-mixed floor mortar according to claim 3, characterized in that: the weight ratio of the plasticizer to the retarder is (0.3-0.6): (1.1-1.4)
The ready-mixed floor mortar according to claim 1 or 2, wherein: the retarder comprises sodium gluconate and white sugar.
5. The ready-mixed floor mortar according to claim 5, characterized in that: the weight ratio of the sodium gluconate to the white sugar is (0.7-1.1): (0.6-1.2).
6. The ready-mixed floor mortar according to claim 1 or 2, wherein: the machine-made sand is processed by cobblestones with the grain diameter of less than 3cm, the machine-made sand is graded in a zone II, and the fineness modulus is 2.3-2.6.
7. The ready-mixed floor mortar according to claim 1 or 2, wherein: the screen allowance of the 4.75mm sieve mesh of the machine-made sand is 0; the sieve bottom content of sieve pores below 0.075mm is 5-8%, methylene blue index is 0.3-1.0, and crushing index value is less than 10%.
8. The ready-mixed floor mortar according to claim 1, characterized in that: the apparent density of the machine-made sand is 2650-2680kg/m3Bulk density 1520-3。
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| CN111848050A (en) * | 2020-08-03 | 2020-10-30 | 郑州铸晟建材科技有限公司 | High-fluidity terrace mortar |
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