CN104261786A - Water glass refractory concrete and preparation method thereof - Google Patents
Water glass refractory concrete and preparation method thereof Download PDFInfo
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Abstract
The invention discloses water glass refractory concrete and a preparation method thereof. The method comprises the following steps of (1) mixing sodium fluosilicate, first-grade magnesium sand, second-grade magnesium sand, magnesium hydroxide and rare-earth metal oxide to prepare a primary concrete material; (2) mixing the primary concrete material, water glass and a water phase to prepare concrete slurry; (3) curing the concrete slurry at the temperature of 15-30 DEG C for 3-4 days to prepare a primary concrete product; and (4) baking the primary concrete product at the temperature of 30-700 DEG C for 20-25 hours to prepare the water glass refractory concrete. The water glass refractory concrete is excellent in fire resistance and mechanical property.
Description
Technical field
The present invention relates to concrete field, particularly, relate to a kind of water glass refractory concrete and this concrete preparation method.
Background technology
Concrete refers to the general designation being cemented to overall engineered composite material by gelling material by gathering materials.Usually concrete one word said refers to makes gelling material with cement, and sand, masonry gather materials and to coordinate by a certain percentage with water (can contain admixture and adulterant), and the cement concrete obtained through stirring, also claims normal concrete, and it is widely used in civil engineering work.Along with the quick house show of real estate industry of current China, also increasing for concrete demand, also more and more pay attention to concrete various performance, existing refractory concrete obtains, fire-resistant weak effect generally by normal concrete modification simultaneously.
Summary of the invention
The object of this invention is to provide a kind of water glass refractory concrete, this refractory concrete has excellent fire performance, and the method steps simultaneously preparing this refractory concrete is simple, and raw material is easy to get.
To achieve these goals, the invention provides a kind of preparation method of water glass refractory concrete, described method comprises:
1) Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide are mixed the operation of just expecting with obtained concrete;
2) described concrete is just expected mix with obtained concrete grout material process with water glass and aqueous phase;
3) by described concrete slurry at 15-30 DEG C maintenance 3-4 days with the operation of obtained concrete first product;
4) described concrete first product is toasted 20-25 hour with the operation of obtained water glass refractory concrete at 30-700 DEG C;
Wherein, the magnesia of described one-level magnesia to be particle diameter be 5-10mm, the magnesia of described secondary magnesia to be particle diameter be 0.15-1.5mm; Relative to the water glass of 100 weight parts, the consumption of described one-level magnesia is 150-200 weight part, the consumption of described secondary magnesia is 500-600 weight part, the consumption of described magnesium hydroxide is 35-60 weight part, the consumption of described rare-earth oxide is 0.1-0.3 weight part, the consumption of described Sodium Silicofluoride is 12-15 weight part, and the consumption of described water is 55-90 weight part.
Present invention also offers a kind of water glass refractory concrete, described water glass refractory concrete is prepared from by above-mentioned method.
Pass through technique scheme, the ultimate-use temperature of the water glass refractory concrete that the present invention is obtained by Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide, rare-earth oxide and water glass is up to 1300 DEG C, simultaneously when ultimate-use temperature, this concrete still has excellent Residual Compressive Strength and linear shrinkage ratio is little.Simple, the easy to operate and raw material of the method steps simultaneously preparing this water glass refractory concrete is easy to get.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The invention provides a kind of preparation method of water glass refractory concrete, described method comprises:
1) Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide are mixed the operation of just expecting with obtained concrete;
2) described concrete is just expected mix with obtained concrete grout material process with water glass and aqueous phase;
3) by described concrete slurry at 15-30 DEG C maintenance 3-4 days with the operation of obtained concrete first product, wherein, concrete maintenance is after casting and compacting of concrete, allow concrete self by hydration gradually setting and harden to make the ever-increasing process of its intensity;
4) described concrete first product is toasted 20-25 hour with the operation of obtained water glass refractory concrete at 30-700 DEG C;
Wherein, the magnesia of described one-level magnesia to be particle diameter be 5-10mm, the magnesia of described secondary magnesia to be particle diameter be 0.15-1.5mm; Relative to the water glass of 100 weight parts, the consumption of described one-level magnesia is 150-200 weight part, the consumption of described secondary magnesia is 500-600 weight part, the consumption of described magnesium hydroxide is 35-60 weight part, the consumption of described rare-earth oxide is 0.1-0.3 weight part, the consumption of described Sodium Silicofluoride is 12-15 weight part, and the consumption of described water is 55-90 weight part.
In the present invention, described rare-earth oxide can be any one rare-earth oxide known in the field, in order to make the water glass refractory concrete obtained, there is excellent fire performance, preferably, described rare-earth oxide is selected from one or more in lanthanum trioxide, cerium oxide, Thorotrast and europium sesquioxide.
Meanwhile, the density preparing the raw water glass of water glass refractory concrete can be selected in wide scope, and in order to make the concrete be prepared from have excellent ultimate compression strength and Young's modulus, preferably, the density of described water glass is 1.36-1.40g/cm
3.
In addition, the water content of Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide has impact to concrete ultimate compression strength and Young's modulus, in order to the concrete ultimate compression strength that improves further and Young's modulus, preferably, the water ratio of described Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide is below 1 % by weight.
In addition, in order to prevent the impurity on the surface of one-level magnesia and secondary magnesia on the impact of concrete fire performance, preferably, described method be also included in the operation that obtained concrete just expects before charing process to one-level magnesia and secondary magnesia, by described one-level magnesia and the tiling of secondary magnesia moistening with water to 5-10cm thickness, then cover moist coverture and at 15-25 DEG C standing 5-6d; Afterwards, described Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide are carried out drying, to make the water ratio of described Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide below 1 % by weight.
According to the present invention, in the operation of obtained water glass refractory concrete, described baking technology is technology known in the field, can be that a step continuous warming toasts, also can be that substep heats up or cooling is toasted, the concrete obtained to make to prepare has excellent fire performance, ultimate compression strength and Young's modulus, preferably, in the operation of obtained water glass refractory concrete, described baking is divided into continuous print first to fourth stage; The described first stage is be warming up to stage of 250-300 DEG C by 30 DEG C, and temperature rise rate is 15-20 DEG C/h; Described subordinate phase is the stage keeping 8-9h at temperature is 250-300 DEG C; The described phase III is be warming up to stage of 700 DEG C by 250-300 DEG C, and temperature rise rate is 150-200 DEG C/h; Described fourth stage is be cooled to stage of 25-30 DEG C by 700 DEG C, and rate of temperature fall is 670-675 DEG C/h.
According to the present invention, in the operation that obtained concrete is just expected, the time of described mixing and temperature can be selected in wide scope, in order to increase work efficiency, reduce energy consumption, preferably simultaneously, the time of described mixing is 2-5min, and the temperature of described mixing is 15-30 DEG C.
According to the present invention, in obtained concrete grout material process, the time of described mixing and temperature can be selected in wide scope, in order to increase work efficiency, reduce energy consumption simultaneously, and preferably, the time of described mixing is 5-10min, and the temperature of described mixing is 15-30 DEG C.
Present invention also offers a kind of water glass refractory concrete, described water glass refractory concrete is prepared from by above-mentioned method.
Below will be described the present invention by embodiment.In following examples, Residual Compressive Strength parameter and oven dry ultimate compression strength parameter are recorded by the method for JGJ-T-23-2001, and Young's modulus parameter is recorded by the method for GB11971-89.
Sodium Silicofluoride is the product of Fujian Qu Cheng Chemical Co., Ltd., one-level magnesia and secondary magnesia are the product of Haicheng City Dong Xu Refractory Co., ltd, magnesium hydroxide is the product of Jinzhou Guang Hong metal-powder company limited, and lanthanum trioxide, cerium oxide, Thorotrast and europium sesquioxide are the product of Guang Li new and high technology Materials Co., Ltd of Ganzhou City.
Embodiment 1
1) at 20 DEG C, by one-level magnesia and the tiling of secondary magnesia moistening with water to 8cm thickness, then cover moist coverture and at 20 DEG C standing 5d.
2) by Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide at 100 DEG C dry 2 hours respectively, the water ratio of Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide is made to be 0.3 % by weight.
3) dried 170kg one-level magnesia and 550kg secondary magnesia, 13kg Sodium Silicofluoride, 50kg magnesium hydroxide and 0.2kg cerium oxide mixing 3min are obtained concrete just to expect.
4) 100kg water glass and 70kg water are added to during concrete is just expected mix 8min and obtain concrete slurry.
5) by maintenance 3d at concrete slurry 25 DEG C with obtained concrete first product.
6) concrete first product is warming up to 280 DEG C with the temperature rise rate of 17 DEG C/h, is then incubated 8h and is warming up to 700 DEG C with the temperature rise rate of 180 DEG C/h, then be cooled to 28 DEG C of obtained water glass refractory concretes with the rate of temperature fall of 672 DEG C/h.
Wherein, the magnesia of one-level magnesia to be particle diameter be 8mm, the magnesia of secondary magnesia to be particle diameter be 1.1mm, the density of water glass is 1.38g/cm
3.
It is 51MPa that this concrete dries ultimate compression strength, and Young's modulus is 32500N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 0.5%, and Residual Compressive Strength is 28MPa.
Embodiment 2
1) at 20 DEG C, one-level magnesia and secondary magnesia are tiled to 5
cm thickness and moistening with water, then covers moist coverture and leave standstill 5d at 15 DEG C.
2) by Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide at 100 DEG C dry 2 hours respectively, the water ratio of Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide is made to be 0.5 % by weight.
3) dried 150kg one-level magnesia and 500kg secondary magnesia, 12kg Sodium Silicofluoride, 35kg magnesium hydroxide and 0.1kg cerium oxide mixing 2min are obtained concrete just to expect.
4) 100kg water glass and 55kg water are added to during concrete is just expected mix 5min and obtain concrete slurry.
5) by maintenance 3d at concrete slurry 15 DEG C with obtained concrete first product.
6) concrete first product is warming up to 250 DEG C with the temperature rise rate of 15 DEG C/h, is then incubated 8h and is warming up to 700 DEG C with the temperature rise rate of 150 DEG C/h, then be cooled to 25 DEG C of obtained water glass refractory concretes with the rate of temperature fall of 670 DEG C/h.
Wherein, the magnesia of one-level magnesia to be particle diameter be 5mm, the magnesia of secondary magnesia to be particle diameter be 0.15mm, the density of water glass is 1.36g/cm
3.
It is 49MPa that this concrete dries ultimate compression strength, and Young's modulus is 28950N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 0.5%, and Residual Compressive Strength is 27MPa.
Embodiment 3
1) at 20 DEG C, by one-level magnesia and the tiling of secondary magnesia moistening with water to 10cm thickness, then cover moist coverture and at 25 DEG C standing 6d.
2) by Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide at 100 DEG C dry 2 hours respectively, the water ratio of Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide is made to be 0.8 % by weight.
3) dried 200kg one-level magnesia and 600kg secondary magnesia, 15kg Sodium Silicofluoride, 60kg magnesium hydroxide and 0.3kg cerium oxide mixing 5min are obtained concrete just to expect.
4) 100kg water glass and 90kg water are added to during concrete is just expected mix 10min and obtain concrete slurry.
5) by maintenance 4d at concrete slurry 30 DEG C with obtained concrete first product.
6) concrete first product is warming up to 300 DEG C with the temperature rise rate of 20 DEG C/h, is then incubated 9h and is warming up to 700 DEG C with the temperature rise rate of 200 DEG C/h, then be cooled to 30 DEG C of obtained water glass refractory concretes with the rate of temperature fall of 675 DEG C/h.
Wherein, the magnesia of one-level magnesia to be particle diameter be 10mm, the magnesia of secondary magnesia to be particle diameter be 1.5mm, the density of water glass is 1.40g/cm
3.
It is 50MPa that this concrete dries ultimate compression strength, and Young's modulus is 31850N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 0.5%, and Residual Compressive Strength is 27MPa.
Embodiment 4
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, change cerium oxide into europium sesquioxide.
It is 49MPa that this concrete dries ultimate compression strength, and Young's modulus is 29740N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 0.6%, and Residual Compressive Strength is 26MPa.
Embodiment 5
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, described Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide are not carried out dry operation.
It is 46MPa that this concrete dries ultimate compression strength, and Young's modulus is 28980N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 0.6%, and Residual Compressive Strength is 26MPa.
Embodiment 6
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, before the operation that obtained concrete is just expected, described one-level magnesia and secondary magnesia are not carried out charing process.
It is 47MPa that this concrete dries ultimate compression strength, and Young's modulus is 28880N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 0.6%, and Residual Compressive Strength is 25MPa.
Embodiment 7
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, in the operation of obtained water glass refractory concrete, described baking is directly warming up to 700 DEG C with 15-20 DEG C/h and is then incubated after 3h and is cooled to 30 DEG C with 670 DEG C/h rate of temperature fall.
It is 47MPa that this concrete dries ultimate compression strength, and Young's modulus is 28580N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 0.5%, and Residual Compressive Strength is 24MPa.
Comparative example 1
Obtained water glass refractory concrete is carried out, unlike the magnesia of, one-level magnesia to be particle diameter be 3mm according to the method for embodiment 1.
It is 37MPa that this concrete dries ultimate compression strength, and Young's modulus is 26650N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.5%, and Residual Compressive Strength is 13MPa.
Comparative example 2
Obtained water glass refractory concrete is carried out, unlike the magnesia of, one-level magnesia to be particle diameter be 15mm according to the method for embodiment 1.
It is 35MPa that this concrete dries ultimate compression strength, and Young's modulus is 23630N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.6%, and Residual Compressive Strength is 12MPa.
Comparative example 3
Obtained water glass refractory concrete is carried out, unlike the magnesia of, secondary magnesia to be particle diameter be 0.1mm according to the method for embodiment 1.
It is 37MPa that this concrete dries ultimate compression strength, and Young's modulus is 21570N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.4%, and Residual Compressive Strength is 15MPa.
Comparative example 4
Obtained water glass refractory concrete is carried out, unlike the magnesia of, secondary magnesia to be particle diameter be 2mm according to the method for embodiment 1.
It is 38MPa that this concrete dries ultimate compression strength, and Young's modulus is 22480N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.6%, and Residual Compressive Strength is 15MPa.
Comparative example 5
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, the consumption of one-level magnesia is 100kg.
It is 30MPa that this concrete dries ultimate compression strength, and Young's modulus is 22130N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.9%, and Residual Compressive Strength is 14MPa.
Comparative example 6
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, the consumption of one-level magnesia is 220kg.
It is 30MPa that this concrete dries ultimate compression strength, and Young's modulus is 22053N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.4%, and Residual Compressive Strength is 11MPa.
Comparative example 7
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, the consumption of secondary magnesia is 400kg.
It is 33MPa that this concrete dries ultimate compression strength, and Young's modulus is 21020N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.8%, and Residual Compressive Strength is 14MPa.
Comparative example 8
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, the consumption of secondary magnesia is 700kg.
It is 34MPa that this concrete dries ultimate compression strength, and Young's modulus is 21550N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.2%, and Residual Compressive Strength is 13MPa.
Comparative example 9
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, not containing rare-earth oxide.
It is 35MPa that this concrete dries ultimate compression strength, and Young's modulus is 23700N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.1%, and Residual Compressive Strength is 16MPa.
Comparative example 10
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, the consumption of cerium oxide is 0.8kg.
It is 37MPa that this concrete dries ultimate compression strength, and Young's modulus is 22450N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.2%, and Residual Compressive Strength is 15MPa.
Comparative example 11
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, the consumption of magnesium hydroxide is 20kg.
It is 35MPa that this concrete dries ultimate compression strength, and Young's modulus is 20350N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.3%, and Residual Compressive Strength is 17MPa.
Comparative example 12
Obtained water glass refractory concrete is carried out according to the method for embodiment 1, unlike, the consumption of magnesium hydroxide is 70kg.
It is 36MPa that this concrete dries ultimate compression strength, and Young's modulus is 21305N/mm
2, being heated to the linear shrinkage after 1300 DEG C is 1.4%, and Residual Compressive Strength is 17MPa.
By above-described embodiment and comparative example known, water glass refractory concrete prepared by the present invention has excellent oven dry ultimate compression strength and Young's modulus, this concrete is heated to 1300 DEG C simultaneously, this concrete linear shrinkage lower than 0.7%, the oven dry ultimate compression strength of Residual Compressive Strength >=50%.By the regulation of this area to water glass refractory concrete: the oven dry ultimate compression strength of Residual Compressive Strength >=50% of sodium silicate concrete, be heated to the linear shrinkage of ultimate-use temperature lower than 0.7%, the ultimate-use temperature of known water glass refractory concrete provided by the invention is at least 1300 DEG C.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (9)
1. a preparation method for water glass refractory concrete, is characterized in that, described method comprises:
1) Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide are mixed the operation of just expecting with obtained concrete;
2) described concrete is just expected mix with obtained concrete grout material process with water glass and aqueous phase;
3) by described concrete slurry at 15-30 DEG C maintenance 3-4 days with the operation of obtained concrete first product;
4) described concrete first product is toasted 20-25 hour with the operation of obtained water glass refractory concrete at 30-700 DEG C;
Wherein, the magnesia of described one-level magnesia to be particle diameter be 5-10mm, the magnesia of described secondary magnesia to be particle diameter be 0.15-1.5mm; Relative to the water glass of 100 weight parts, the consumption of described one-level magnesia is 150-200 weight part, the consumption of described secondary magnesia is 500-600 weight part, the consumption of described magnesium hydroxide is 35-60 weight part, the consumption of described rare-earth oxide is 0.1-0.3 weight part, the consumption of described Sodium Silicofluoride is 12-15 weight part, and the consumption of described water is 55-90 weight part.
2. preparation method according to claim 1, wherein, described rare-earth oxide be selected from lanthanum trioxide, cerium oxide, Thorotrast and europium sesquioxide one or more.
3. preparation method according to claim 1 and 2, wherein, the density of described water glass is 1.36-1.40g/cm
3.
4. preparation method according to claim 1 and 2, wherein, the water ratio of described Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide is below 1 % by weight.
5. preparation method according to claim 4, wherein, before described method is also included in the operation that obtained concrete just expects, described one-level magnesia and the tiling of secondary magnesia is moistening with water to 5-10cm thickness, then cover moist coverture and at 15-25 DEG C standing 5-6d; Thereafter, described Sodium Silicofluoride, one-level magnesia, secondary magnesia, magnesium hydroxide and rare-earth oxide are carried out drying.
6. preparation method according to claim 1 and 2, wherein, in the operation of obtained water glass refractory concrete, described baking is divided into continuous print first to fourth stage; The described first stage is be warming up to stage of 250-300 DEG C by 30 DEG C, and temperature rise rate is 15-20 DEG C/h; Described subordinate phase is the stage keeping 8-9h at temperature is 250-300 DEG C; The described phase III is be warming up to stage of 700 DEG C by 250-300 DEG C, and temperature rise rate is 150-200 DEG C/h; Described fourth stage is be cooled to stage of 25-30 DEG C by 700 DEG C, and rate of temperature fall is 670-675 DEG C/h.
7. preparation method according to claim 1 and 2, wherein, in the operation that obtained concrete is just expected, the time of described mixing is 2-5min, and the temperature of described mixing is 15-30 DEG C.
8. preparation method according to claim 1 and 2, wherein, in obtained concrete grout material process, the time of described mixing is 5-10min, and the temperature of described mixing is 15-30 DEG C.
9. a water glass refractory concrete, is characterized in that, described water glass refractory concrete is prepared from by the method described in any one in claim 1-8.
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| CN113698157A (en) * | 2021-10-18 | 2021-11-26 | 广州中创建筑科技有限公司 | Concrete with fire resistance |
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