CN102295423A - Water reducing and early strength antifreeze - Google Patents
Water reducing and early strength antifreeze Download PDFInfo
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- CN102295423A CN102295423A CN 201110158526 CN201110158526A CN102295423A CN 102295423 A CN102295423 A CN 102295423A CN 201110158526 CN201110158526 CN 201110158526 CN 201110158526 A CN201110158526 A CN 201110158526A CN 102295423 A CN102295423 A CN 102295423A
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Abstract
The invention discloses a water reducing and early strength antifreeze, which comprises raw materials of, by weight, 18-25% of naphthalene efficient water reducer, 13-20% of early strength agent, 5-13% of antifreezing agent calcium nitrite, and 53-60% of mineral admixture fly ash, wherein the early strength agent is sulfate. The naphthalene efficient water reducer and the mineral admixture fly ash are blended for 3min, and the early strength agent and the antifreezing agent are added successively and stirred for 7min. The water reducing and early strength antifreeze of the invention can substantially improve concrete early stage strength under a low or negative temperature construction condition, reduce cracks and enhance endurance of a borehole wall, so as to satisfy requirements of shrinkage reducing, crack resistance, waterproofness, early strength and endurance improvement of the borehole wall strength.
Description
Technical field
The present invention relates to technical field of concrete additives, the early strong antifreezing agent of specifically a kind of diminishing.
Background technology
At present, borehole wall freezing process is a main method during mine shaft is built.In freezing process, the wall pressure that freezing wall acts on the outer shaft wall is called pressure of freezing wall, pit shaft excavation back pressure of freezing wall can reach 70～80% within 7d, sometimes reach 90%, but the outer shaft wall concrete builds and maintenance under cold condition, hydration reaction slowly or stop, gain in strength is little, generally have only 30～40% of design strength, make the growth of the early strength of outer shaft wall and pressure of freezing wall incompatible, thereby outer shaft wall is wrecked.In addition concrete also will bear vertical pressure and for good and all press, and therefore, requires higher to concrete low-temperature high-early strength performance demands.
In addition, in freezing process, the outer shaft wall surrounding temperature is low temperature even is subzero temperature, requires concrete to have good anti-freezing property.Because temperature variation is bigger, 10～20 ℃ of the inside and outside wall temperature difference, and that hydration heat is warming up to the temperature difference of cooling is bigger, reaches 30～40 ℃ sometimes, must cause that borehole wall internal structure produces thermal stress, makes the borehole wall hoop crack occur.Because the influence of complexing action power such as pressure of freezing wall and temperature, pressure, thermal cracking, desciccation crack, self-constriction crack may appear in borehole wall concrete, thereby infiltration and drainage take place.Therefore require concrete to have good resistance to cleavage, to reduce infiltration and permeable generation.
Borehole wall Steel Concrete is subjected to phreatic erosion action, requires concrete to have the performance of resisting chloride ion penetration, sulphate attack.
At present, lack satisfy above-mentioned requirements at the special additive product that uses in the borehole wall freezing process, can't effectively guarantee construction quality in the practice of construction.
Summary of the invention
Purpose of the present invention is exactly that a kind of early strong antifreezing agent of the special-purpose diminishing of pit shaft that is applied to the single, double layer borehole wall of mine shaft common law, freezing process will be provided, with remarkable improvement concrete early strength in low subzero temperature condition construction, reduce the crack, improve borehole wall weather resistance, thus satisfy to wall strength reducing and anti-cracking, waterproof, early strong, improve durability requirement.
The present invention is achieved in that
The early strong antifreezing agent of diminishing is made up of following raw materials by weight: naphthalene series high-efficiency water-reducing agent 18-25%, and hardening accelerator 13-20%, frostproofer calcium nitrite 5-13%, mineral admixture flyash 53-60%, described hardening accelerator are vitriol.
Naphthalene series high-efficiency water-reducing agent of the present invention can be selected FDN, SSF-1000 naphthalene water reducer for use.
Hardening accelerator of the present invention can be selected vitriol such as vitriolate of tartar, sodium sulfate for use.
The early strong antifreezing agent of diminishing of the present invention prepares by the following method:
Naphthalene series high-efficiency water-reducing agent and mineral admixture flyash were stirred 3 minutes, add hardening accelerator and frostproofer restir then successively and got final product in 7 minutes.
Under technique scheme, the present invention can realize like this:
Described raw material is preferably formed by following weight percent: naphthalene series high-efficiency water-reducing agent 20%, hardening accelerator 16%, frostproofer calcium nitrite 8%, mineral admixture flyash 56%.
The early strong antifreezing agent of diminishing of the present invention has good antifreeze and epistasis energy morning:
1, (10～-15 ℃) are constructed and can be prevented the early stage freeze injury of green concrete under subzero temperature, accelerate strength development.One day intensity of concrete can reach more than 70% of design strength, can meet or exceed design strength in three days, and later strength still is improved largely.
2, water-reducing rate is greater than 20%, and concrete has good operation.
3, significantly improve concrete physical and mechanical property and weather resistance, to the reinforcing bar non-corroding.
4, quicken construction, the reduction of erection time, accelerate the template turnover, reduce construction cost.
5, do not contain contaminate environment, influence the objectionable constituent of health of human body.
Embodiment
Embodiment 1
Naphthalene series high-efficiency water-reducing agent is selected the SSF-1000 naphthalene water reducer for use.
Hardening accelerator is selected sodium sulfate for use.
Mineral admixture flyash: GB/T 18376-2002 II level.
In following ratio weighing: water reducer 20kg, hardening accelerator 16kg, frostproofer calcium nitrite 8kg, mineral admixture flyash 56kg.
Preparation according to the following steps:
Naphthalene series high-efficiency water-reducing agent and mineral admixture flyash were stirred 3 minutes, add hardening accelerator and frostproofer restir then successively and got final product in 7 minutes.
The early strong applicable cases (temperature be-10～-15 ℃) of antifreezing agent in cucurbitacin mine shaft freezing process of the made diminishing of present embodiment:
Sand selects for use Hangjin Banner to produce coarse sand, fineness modulus 3.2;
Stone adopts Wuhai rubble, 5～31.5mm continuous grading;
I, II concrete, cement is for covering western cement PO 42.5R; The III concrete, cement is for covering western cement PO 52.5R.
Table 1 concrete mix
The made concrete technology index of table 1 compares:
I concrete 1d ultimate compression strength is 29.1MPa, and 3d ultimate compression strength is 41.4MPa, and 7d ultimate compression strength is 55MPa, reaches 137.5% of design strength; The 28d concrete crushing strength is 63.9MPa, reaches 159.8% of design strength.The actual measurement slump is 160mm, fully satisfies construction requirement.
II concrete 1d ultimate compression strength is 31.9MPa, and 3d ultimate compression strength is 46.75MPa, and the 7d strength grade is 55.4MPa, reaches 123.1% of design strength; The 28d strength grade of concrete is 60.3MPa, reaches 134% of design strength.The actual measurement slump is 165mm.
III concrete 3d ultimate compression strength is 15.2MPa, reaches 38% of design strength, and 5d ultimate compression strength is 17.6MPa, reaches 44% of design strength, and 7d ultimate compression strength is 29.45, reaches 73% of design strength.
Embodiment 2
Naphthalene series high-efficiency water-reducing agent is selected the FDN naphthalene water reducer for use.
Hardening accelerator is selected vitriolate of tartar for use.
Mineral admixture flyash: GB/T 18376-2002II level.
In following ratio weighing: water reducer 18kg, hardening accelerator 20kg, frostproofer calcium nitrite 9kg, mineral admixture flyash 53kg.
Preparation according to the following steps:
Naphthalene series high-efficiency water-reducing agent and mineral admixture flyash were stirred 3 minutes, add hardening accelerator and frostproofer restir then successively and got final product in 7 minutes.
Embodiment 3
Naphthalene series high-efficiency water-reducing agent is selected the SSF-1000 naphthalene water reducer for use.
Hardening accelerator is selected sodium sulfate for use.
Mineral admixture flyash: GB/T 18376-2002II level.
In following ratio weighing: water reducer 18kg, hardening accelerator 20kg, frostproofer calcium nitrite 9kg, mineral admixture flyash 53kg.
Preparation according to the following steps:
Naphthalene series high-efficiency water-reducing agent and mineral admixture flyash were stirred 3 minutes, add hardening accelerator and frostproofer restir then successively and got final product in 7 minutes.
Embodiment 4
Naphthalene series high-efficiency water-reducing agent is selected the FDN naphthalene water reducer for use.
Hardening accelerator is selected sodium sulfate for use.
Mineral admixture flyash: GB/T 18376-2002II level.
In following ratio weighing: water reducer 25kg, hardening accelerator 13kg, frostproofer calcium nitrite 5kg, mineral admixture flyash 57kg.
Preparation according to the following steps:
Naphthalene series high-efficiency water-reducing agent and mineral admixture flyash were stirred 3 minutes, add hardening accelerator and frostproofer restir then successively and got final product in 7 minutes.
Embodiment 5
Naphthalene series high-efficiency water-reducing agent is selected the FDN naphthalene water reducer for use.
Hardening accelerator is selected vitriolate of tartar for use.
Mineral admixture flyash: GB/T 18376-2002II level.
In following ratio weighing: water reducer 18kg, hardening accelerator 17kg, frostproofer calcium nitrite 5kg, mineral admixture flyash 60kg.
Preparation according to the following steps:
Naphthalene series high-efficiency water-reducing agent and mineral admixture flyash were stirred 3 minutes, add hardening accelerator and frostproofer restir then successively and got final product in 7 minutes.
Embodiment 6
Naphthalene series high-efficiency water-reducing agent is selected the SSF-1000 naphthalene water reducer for use.
Hardening accelerator is selected vitriolate of tartar for use.
Mineral admixture flyash: GB/T 18376-2002II level.
In following ratio weighing: water reducer 18kg, hardening accelerator 18kg, frostproofer calcium nitrite 13kg, mineral admixture flyash 51kg.
Preparation according to the following steps:
Naphthalene series high-efficiency water-reducing agent and mineral admixture flyash were stirred 3 minutes, add hardening accelerator and frostproofer restir then successively and got final product in 7 minutes.
The prepared early strong antifreezing agent of diminishing of embodiment 2-6 is used in concrete, all can significantly improve concrete early strength when under low subzero temperature (10～-15 ℃) condition, constructing, one day intensity of concrete can reach more than 70% of design strength, can meet or exceed design strength in three days, and can reduce the crack, improve borehole wall weather resistance.
Claims (2)
1. the early strong antifreezing agent of a diminishing, it is characterized in that forming: naphthalene series high-efficiency water-reducing agent 18-25%, hardening accelerator 13-20%, frostproofer calcium nitrite 5-13% by following raw materials by weight, mineral admixture flyash 53-60%, described hardening accelerator are vitriol.
2. the early strong antifreezing agent of diminishing according to claim 1 is characterized in that described raw material forms by following weight percent: naphthalene series high-efficiency water-reducing agent 20%, hardening accelerator 16%, frostproofer calcium nitrite 8%, mineral admixture flyash 56%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110158526 CN102295423A (en) | 2011-06-14 | 2011-06-14 | Water reducing and early strength antifreeze |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110158526 CN102295423A (en) | 2011-06-14 | 2011-06-14 | Water reducing and early strength antifreeze |
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| CN102295423A true CN102295423A (en) | 2011-12-28 |
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| CN 201110158526 Pending CN102295423A (en) | 2011-06-14 | 2011-06-14 | Water reducing and early strength antifreeze |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587710A (en) * | 2016-12-21 | 2017-04-26 | 中国铁道科学研究院铁道建筑研究所 | Concrete antifreezer |
| CN110423038A (en) * | 2019-09-03 | 2019-11-08 | 北京金隅水泥节能科技有限公司 | Water-reducing agent and preparation method thereof, antifreezing agent and application thereof and concrete |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101279832A (en) * | 2008-04-30 | 2008-10-08 | 武汉一冶建筑安装工程有限责任公司 | Composite mineral blending concrete with mixed coarse aggregate |
-
2011
- 2011-06-14 CN CN 201110158526 patent/CN102295423A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101279832A (en) * | 2008-04-30 | 2008-10-08 | 武汉一冶建筑安装工程有限责任公司 | Composite mineral blending concrete with mixed coarse aggregate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587710A (en) * | 2016-12-21 | 2017-04-26 | 中国铁道科学研究院铁道建筑研究所 | Concrete antifreezer |
| CN110423038A (en) * | 2019-09-03 | 2019-11-08 | 北京金隅水泥节能科技有限公司 | Water-reducing agent and preparation method thereof, antifreezing agent and application thereof and concrete |
| CN110423038B (en) * | 2019-09-03 | 2022-07-22 | 北京金隅水泥节能科技有限公司 | Water reducing agent and preparation method thereof, antifreezing agent and application thereof, and concrete |
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Application publication date: 20111228 |