CN104496320A - Cement-based self-leveling mortar and preparation method thereof - Google Patents

Cement-based self-leveling mortar and preparation method thereof Download PDF

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Publication number
CN104496320A
CN104496320A CN201410795029.3A CN201410795029A CN104496320A CN 104496320 A CN104496320 A CN 104496320A CN 201410795029 A CN201410795029 A CN 201410795029A CN 104496320 A CN104496320 A CN 104496320A
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China
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cement
self
parts
leveling mortar
water
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CN201410795029.3A
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李东旭
张树鹏
张毅
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Nanjing University of Science and Technology
Nanjing Tech University
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Nanjing University of Science and Technology
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Abstract

The invention relates to cement-based self-leveling mortar. The cement-based self-leveling mortar is characterized by comprising the following raw material components in parts by weight: 20-25 parts of PO42.5 cement, 8-10 parts of ground cement, 0.2-0.4 part of a water reducing agent, 0.009-0.01 part of a water retaining agent, 0.16-0.2 part of an early strength agent, 0.3-0.6 part of re-dispersible emulsion powder, 0.1-0.3 part of a defoaming agent, 14-16 parts of filler, 2.5-3.2 parts of an expanding agent and 48-50 parts of aggregate. The preparation method comprises the following steps: firstly weighing the PO42.5 cement, the filler and the expanding agent according to parts by weight, throwing the components into a grinding machine for grinding, throwing other components into a mixer, and mixing and stirring the components to obtain the cement-based self-leveling mortar. The preparation and application methods of the cement-based self-leveling mortar provided by the invention are simple and good in construction workability and have the advantages of good water resistance, low shrink, high mechanical properties and high self-leveling performance; by adopting the invention, problems of the existing double-component cement-based self-leveling mortar, such as complicated onsite construction process, unstable mortar properties and environmental pollution are effectively solved, and no toxic or harmful substance is contained, so that the cement-based self-leveling mortar is a green and environmental-friendly building material.

Description

A kind of cement-based self-leveling mortar and preparation method thereof
Technical field
The present invention relates to building material technical field, particularly relate to a kind of cement-based self-leveling mortar and preparation method thereof.
Background technology
Cement-based self-leveling mortar is a kind of is major gelled material with cement, adds suitable additive and fine sand etc. and mixes, for the new terrestrial material of floor leveling or facing.Only need to add water uniform mixing by the water cement ratio scope of regulation during use, after mechanical pumping or artificial construction, without the need to manually floating, form flat surface by slurry self gravitation flows by action is dynamic.Self-leveling material has low, bright and clean smooth, the advantage such as intensity level is high, the thin and water-fast acid resistance of leveling layer thickness is good of mobility and good stability, easy construction, labour intensity, it is the ideal material of the ground surface consolidations such as large supermarket, market, parking lot, factory floor, warehouse, also be a developing direction of present building ground construction, market potential is very large.
The problems such as it is low that the cement self-leveling mortar of current domestic production still exists early strength, surperficial efflorescence, and wear resistance is not enough, owing to constructing with the form of thin layer, easily cause cracking, the stability of product performance is not ideal enough.Therefore, at present almost can't using the surface layer of gravity flowing levelling mortar as terrace, and epoxy resin self-leveling material can only be re-used on Self-leveling screed-coat or paste other earth materials such as PVC board, ceramic tile or carpet again and make ornament layer, have impact on its large scale application.Be summed up, the cement-based self-leveling mortar of preparation performance excellence to need to resolve following problem: the problem between mobility and stability; The early problem of strong and slow setting; Shrink and the problem expanded.
In general, improving cement fineness has very large benefit to the early strength increasing cement, also has certain influence to 28d intensity, because cement grinding is thinner, specific surface area is larger, and the reaction surface that cement contacts with water is also large.Thus hydrated cementitious is accelerated, the carrying out of condensation and process of setting, so early strength improves obviously.But specific surface area is increased to a certain degree, then strength degradation, this is because cement grinding mill must be thinner, standard consistency water requirement is also higher, after making cement slurry setting and harden, has a large amount of free-waters residual wherein, along with the evaporation of moisture, produce more space, cause strength degradation, resistance to corrosion reduces.Controlled the fineness of cement by control ratio surface-area, increase the early strength of cement-based self-leveling mortar with this; In addition, use levigate ordinary Portland cement as the gelling material of gravity flowing levelling mortar, thus replace the composite of silicate cement and other special cements, both can solve the problem that early strength and later stage shrink, and can cost have been reduced again.
Summary of the invention
Object of the present invention provides a kind of cement-based self-leveling mortar to improve the deficiencies in the prior art, and another object of the present invention is to provide the preparation method of above-mentioned cement-based self-leveling mortar, and preparation technology is simple, stable performance.
Technical scheme of the present invention is: a kind of cement-based self-leveling mortar, it is characterized in that the mass parts of its feed composition and each component is respectively: PO42.5 cement 20 ~ 25 parts, grinding fine cement 8 ~ 10 parts, water reducer 0.2 ~ 0.4 part, water-holding agent 0.009 ~ 0.01 part, hardening accelerator 0.16 ~ 0.2 part, redispersable latex powder 0.3 ~ 0.6 part, defoamer 0.1 ~ 0.3 part, filler 14 ~ 16 parts, swelling agent 2.5 ~ 3.2 parts, 48 ~ 50 parts, aggregate.
Preferably above-mentioned grinding fine cement is surface-area is 500 ~ 600m 2the PO42.5 cement of/kg.Preferably above-mentioned water reducer is polycarboxylate water-reducer or melamine water reducing agent.Preferably described water-holding agent is the one in hydroxypropyl methyl cellulose ether (HPMC), methyl cellulose ether (MC) or ethoxyl methyl cellulose ether (HEMC); Water-holding agent viscosity is between 60000 ~ 100000mpas.Preferably described redispersable latex powder redispersable latex powder is " Wa Ke " vAE latex powder or " Yi Laitai " one in vinyl acetate between to for plastic-tertiary carbon vinyl acetate-ethylene copolymer latex powder.Preferably described hardening accelerator is calcium formiate or Quilonum Retard; Described defoamer is German P803 defoamer or P823 defoamer; Described swelling agent is U-shaped high-efficiency expanding agent, and code name is UEA-H.Preferably described filler is dicalcium powder and slag powders, and the mass ratio of dicalcium powder and slag powders is 0.5 ~ 6:1.Coarse whiting is commercially available dry powder, and fineness is at 400-500 order, and calcium carbonate is greater than 85%, and whiteness is greater than 94; Slag powders is commercially available ground granulated blast furnace slag, fineness at 400-500 order, density>=2.8g/cm 3, specific surface area>=400m 2/ kg.Preferably described aggregate is rubble sand and fine quartz sand; The order number of rubble sand is 30 ~ 70 orders, and the order number of fine quartz sand is 70 ~ 120 orders; The weight ratio of rubble sand and fine quartz sand is 1 ~ 1.6:1.
Present invention also offers the preparation method of above-mentioned cement-based self-leveling mortar, first PO42.5 cement, filler, swelling agent weighed by weight ratio, then drop in grinding machine, levigate to specific surface area be 500 ~ 600m 2/ kg, finally weighs by weight ratio by grinding fine cement, water reducer, water-holding agent, hardening accelerator, redispersable latex powder, defoamer, aggregate, and drop in mixer, mix and blend 10 ~ 20 minutes, pack packages and obtains cement-based self-leveling mortar.
Beneficial effect:
Cement-based self-leveling mortar preparation and application method of the present invention is simple, construction workability good, has that water resistance is good, lower shrinkage, mechanical mechanics property are high, the advantage of Self-leveling performance; In addition, the present invention effectively can solve the problems such as existing two-pack cement-based self-leveling mortar site construction technology is complicated, mortar performance is unstable, contaminate environment, due to not containing poisonous and harmful substances, is therefore a kind of material of construction of environmental protection.
Embodiment
The present invention is further illustrated below by embodiment.
Embodiment 1
By weight percentage, take PO42.5 cement 24 parts, specific surface area is 360m 2/ kg, dicalcium powder 10 parts, fineness is 400 orders, slag powders 5 parts, and fineness is 400 orders, UEA-H swelling agent 2.5 parts, drops in grinding machine, levigate to specific surface area be 600m 2/ kg; Then take grinding fine cement 8 parts, specific surface area is 600m 2/ kg, quartz sand 30 parts, fineness is 50 orders, quartz sand 20 parts, and fineness is 100 orders, polycarboxylate water-reducer 0.2 part, water-holding agent HPMC0.01 part, and viscosity is 60000mpa.s, redispersable latex powder " Yi Laitai " vinyl acetate between to for plastic-tertiary carbon vinyl acetate-0.6 part, ethylene copolymer latex powder, calcium formiate 0.16 part, German P823 defoamer 0.1 part drops in mixer together with powder, mixes 15 minutes; Obtain cement-based self-leveling mortar powder.
Embodiment 2
By weight percentage, take PO42.5 cement 22 parts, specific surface area is 360m 2/ kg, dicalcium powder 9 parts, fineness is 450 orders, slag powders 7 parts, and fineness is 400 orders, UEA-H swelling agent 3.0 parts, drops in grinding machine, levigate to specific surface area be 550m 2/ kg; Then take grinding fine cement 9 parts, specific surface area is 550m 2/ kg, quartz sand 25 parts, fineness is 30 orders, quartz sand 23 parts, and fineness is 120 orders, melamine amino acid water reducer 0.4 part, water-holding agent HPMC0.01 part, and viscosity is 80000mpa.s, redispersable latex powder " Yi Laitai " vinyl acetate between to for plastic-tertiary carbon vinyl acetate-0.6 part, ethylene copolymer latex powder, calcium formiate 0.2 part, German P803 defoamer 0.3 part drops in mixer together with powder, mixes 10 minutes.Obtain cement-based self-leveling mortar powder.
Embodiment 3
By weight percentage, take PO42.5 cement 25 parts, specific surface area is 360m 2/ kg, dicalcium powder 10 parts, fineness is 400 orders, slag powders 6 parts, and fineness is 500 orders, UEA-H swelling agent 3.2 parts, drops in grinding machine, levigate to specific surface area be 520m 2/ kg; Then take grinding fine cement 8 parts, specific surface area is 520m 2/ kg, quartz sand 30 parts, fineness is 40 orders, quartz sand 19 parts, and fineness is 100 orders, polycarboxylate water-reducer 0.4 part, water-holding agent HEMC0.009 part, and viscosity is 70000mpa.s, redispersable latex powder " Wa Ke " vAE latex powder 0.4 part, calcium formiate 0.2 part, German P823 defoamer 0.2 part drops in mixer together with powder, mixes 15 minutes, obtains cement-based self-leveling mortar powder.
Embodiment 4
By weight percentage, take PO42.5 cement 20 parts, specific surface area is 360m 2/ kg, dicalcium powder 5 parts, fineness is 500 orders, slag powders 10 parts, and fineness is 400 orders, UEA-H swelling agent 3.2 parts, drops in grinding machine, levigate to specific surface area be 570m 2/ kg; Then take grinding fine cement 10 parts, specific surface area is 570m 2/ kg, quartz sand 25 parts, fineness is 70 orders, quartz sand 25 parts, and fineness is 90 orders, polycarboxylate water-reducer 0.3 part, water-holding agent MC0.01 part, and viscosity is 60000mpa.s, redispersable latex powder " Yi Laitai " vinyl acetate between to for plastic-tertiary carbon vinyl acetate-0.3 part, ethylene copolymer latex powder, Quilonum Retard hardening accelerator 0.2 part, German P823 defoamer 0.3 part drops in mixer together with powder, mixes 20 minutes; Obtain cement-based self-leveling mortar powder.
Embodiment 5
By weight percentage, take PO42.5 cement 25 parts, specific surface area is 360m 2/ kg, dicalcium powder 12 parts, fineness is 400 orders, slag powders 2 parts, and fineness is 400 orders, UEA-H swelling agent 2.5 parts, drops in grinding machine, levigate to specific surface area be 500m 2/ kg; Then take grinding fine cement 8 parts, specific surface area is 500m 2/ kg, quartz sand 30 parts, fineness is 40 orders, quartz sand 20 parts, and fineness is 70 orders, melamine water reducing agent 0.2 part, water-holding agent HPMC0.009 part, and viscosity is 100000mpa.s, redispersable latex powder " Wa Ke " vAE latex powder 0.6 part, Quilonum Retard hardening accelerator 0.16 part, German P803 defoamer 0.1 part drops in mixer together with powder, mixes 15 minutes; Obtain cement-based self-leveling mortar powder.
Then embodiment 1-5 is obtained cement-based self-leveling mortar powder and add 18% water, with stirrer first with 60 revs/min, stir 90s, static 80s, then with 125 revs/min, stir 70s, obtain cement-based self-leveling mortar.Correlation parameter test result as table 1 so.
Table 1
Table 1 survey cement-based self-leveling mortar properties meet JC/T985-2005 " ground cement-based self-leveling mortar " correlated performance requirement, after adding grinding fine cement, can effectively improve cement-based self-leveling mortar early strength, swelling agent UEA-H mixes, and can effectively improve the shrinkage of cement-based self-leveling mortar, it is simple that the cement-based self-leveling mortar prepared has preparation method, with low cost, intensity is high, and degree of mobilization is good, shrink stable, the features such as workability is excellent.
The above; be only the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those of ordinary skill in the art are in the technical scope disclosed by the present invention; the change can expected without creative work or replacement, all should be encompassed within protection scope of the present invention.Therefore, the protection domain that protection scope of the present invention should limit with claims is as the criterion.

Claims (9)

1. a cement-based self-leveling mortar, it is characterized in that the mass parts of its feed composition and each component is respectively: PO42.5 cement 20 ~ 25 parts, grinding fine cement 8 ~ 10 parts, water reducer 0.2 ~ 0.4 part, water-holding agent 0.009 ~ 0.01 part, hardening accelerator 0.16 ~ 0.2 part, redispersable latex powder 0.3 ~ 0.6 part, defoamer 0.1 ~ 0.3 part, filler 14 ~ 16 parts, swelling agent 2.5 ~ 3.2 parts, 48 ~ 50 parts, aggregate.
2. cement-based self-leveling mortar according to claim 1, is characterized in that: described grinding fine cement is surface-area is 500 ~ 600m 2the PO42.5 cement of/kg.
3. cement-based self-leveling mortar according to claim 1, is characterized in that: described water reducer is polycarboxylate water-reducer or melamine water reducing agent.
4. cement-based self-leveling mortar according to claim 1, is characterized in that: described water-holding agent is the one in hydroxypropyl methyl cellulose ether, methyl cellulose ether or ethoxyl methyl cellulose ether; Water-holding agent viscosity is between 60000 ~ 100000mpas.
5. cement-based self-leveling mortar according to claim 1, is characterized in that: described redispersable latex powder redispersable latex powder is " Wa Ke " 5044 VAE latex powder or " Yi Laitai " one in FL3210 vinyl acetate between to for plastic-tertiary carbon vinyl acetate-ethylene copolymer latex powder.
6. cement-based self-leveling mortar according to claim 1, is characterized in that: described hardening accelerator is calcium formiate or Quilonum Retard; Described defoamer is German P803 defoamer or P823 defoamer; Described swelling agent is U-shaped high-efficiency expanding agent.
7. cement-based self-leveling mortar according to claim 1, is characterized in that: described filler is dicalcium powder and slag powders, and the mass ratio of dicalcium powder and slag powders is 0.5 ~ 6:1; Dicalcium powder fineness is at 400-500 order; Slag powders fineness is at 400-500 order.
8. cement-based self-leveling mortar according to claim 1, is characterised in that: described aggregate is rubble sand and fine quartz sand; The order number of rubble sand is 30 ~ 70 orders, and the order number of fine quartz sand is 70 ~ 120 orders; The weight ratio of rubble sand and fine quartz sand is 1 ~ 1.6:1.
9. prepare a method for cement-based self-leveling mortar as claimed in claim 1, first PO42.5 cement, filler, swelling agent weighed by weight ratio, then drop in grinding machine, levigate to specific surface area be 500 ~ 600m 2/ kg, finally weighs by weight ratio by grinding fine cement, water reducer, water-holding agent, hardening accelerator, redispersable latex powder, defoamer and aggregate, and drop in mixer, mix and blend 10 ~ 20 minutes, pack packages and obtains cement-based self-leveling mortar.
CN201410795029.3A 2014-12-18 2014-12-18 Cement-based self-leveling mortar and preparation method thereof Pending CN104496320A (en)

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Cited By (12)

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Publication number Priority date Publication date Assignee Title
CN104961400A (en) * 2015-06-29 2015-10-07 湖州华仑助剂科技有限公司 Concrete
CN105236894A (en) * 2015-10-29 2016-01-13 华南理工大学 Anti-shrinkage self-leveling mortar with good self-healing property for bedding layer and preparation method thereof
CN105777034A (en) * 2016-02-25 2016-07-20 张学健 Abrasion-resistant cement-based self-leveling mortar
CN106116326A (en) * 2016-06-17 2016-11-16 南京徽腾环保科技有限公司 A kind of Self-leveling dry powder and mortar and preparation method, utilize terrace and construction method thereof prepared by this dry powder and mortar
CN106587809A (en) * 2016-11-30 2017-04-26 浙江理工大学 Preparing method for surface course self-leveling cement
CN106630843A (en) * 2016-12-28 2017-05-10 嘉华特种水泥股份有限公司 Cement-based self-leveling anti-cracking mortar
CN106699072A (en) * 2015-11-12 2017-05-24 上海东大化学有限公司 Cement-based self-leveling mortar and preparation method thereof
CN107324746A (en) * 2017-07-19 2017-11-07 刘少伟 A kind of new gravity flowing levelling mortar and its production technology
CN107417221A (en) * 2017-09-21 2017-12-01 张聪聪 Wear-resistant and crack-resistant cement-based self-leveling mortar and its production method
CN108329781A (en) * 2018-02-13 2018-07-27 贵州皓科新型材料有限公司 Water-proof decorative integrative paint and preparation method thereof
CN112125601A (en) * 2020-11-11 2020-12-25 海南瑞宸新型建材有限公司 Low-cost cement self-leveling mortar, preparation method and application method thereof
CN112266226A (en) * 2020-10-29 2021-01-26 李金锁 Non-ignition cement-based self-leveling mortar and preparation method thereof

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104961400A (en) * 2015-06-29 2015-10-07 湖州华仑助剂科技有限公司 Concrete
CN105236894A (en) * 2015-10-29 2016-01-13 华南理工大学 Anti-shrinkage self-leveling mortar with good self-healing property for bedding layer and preparation method thereof
CN106699072A (en) * 2015-11-12 2017-05-24 上海东大化学有限公司 Cement-based self-leveling mortar and preparation method thereof
CN105777034A (en) * 2016-02-25 2016-07-20 张学健 Abrasion-resistant cement-based self-leveling mortar
CN106116326A (en) * 2016-06-17 2016-11-16 南京徽腾环保科技有限公司 A kind of Self-leveling dry powder and mortar and preparation method, utilize terrace and construction method thereof prepared by this dry powder and mortar
CN106116326B (en) * 2016-06-17 2018-08-14 南京徽腾环保科技有限公司 A kind of Self-leveling dry powder and mortar and preparation method, the terrace for utilizing the dry powder and mortar to prepare and its construction method
CN106587809A (en) * 2016-11-30 2017-04-26 浙江理工大学 Preparing method for surface course self-leveling cement
CN106630843A (en) * 2016-12-28 2017-05-10 嘉华特种水泥股份有限公司 Cement-based self-leveling anti-cracking mortar
CN107324746A (en) * 2017-07-19 2017-11-07 刘少伟 A kind of new gravity flowing levelling mortar and its production technology
CN107417221A (en) * 2017-09-21 2017-12-01 张聪聪 Wear-resistant and crack-resistant cement-based self-leveling mortar and its production method
CN108329781A (en) * 2018-02-13 2018-07-27 贵州皓科新型材料有限公司 Water-proof decorative integrative paint and preparation method thereof
CN112266226A (en) * 2020-10-29 2021-01-26 李金锁 Non-ignition cement-based self-leveling mortar and preparation method thereof
CN112125601A (en) * 2020-11-11 2020-12-25 海南瑞宸新型建材有限公司 Low-cost cement self-leveling mortar, preparation method and application method thereof

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