CN105198294A - Building insulation mortar prepared by red mud based alkali-activated cementitious material - Google Patents
Building insulation mortar prepared by red mud based alkali-activated cementitious material Download PDFInfo
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- CN105198294A CN105198294A CN201510579115.5A CN201510579115A CN105198294A CN 105198294 A CN105198294 A CN 105198294A CN 201510579115 A CN201510579115 A CN 201510579115A CN 105198294 A CN105198294 A CN 105198294A
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Abstract
The invention discloses building insulation mortar prepared by a red mud based alkali-activated cementitious material. The building insulation mortar is prepared from the red mud based alkali-activated cementitious material, expanded perlite, glass bead, latex powder, cellulose ether and an air entraining agent, wherein the red mud based alkali-activated cementitious material is of powder, which is prepared from 50 to 70 percent of red mud plus 30 percent of slag powder plus 0 to 20 percent of coal ash, and is activated by water glass of the weight percentage accounting for 5 percent; the fineness of the red mud is that the screen residue obtained by 45 mum square hole sieve is less than 20.0 percent; the specific surface area of the slag powder is greater or equal to 400m<2>/kg, and the active grade is greater than or equal to S95; the coal ash is of grade I ash, and the activity index is greater than 70; the module of the water glass is 1.6 to 2.2; the glass bead is of closed cell perlite, the volume-weight is 100 to 150 kg/m<3>, and the water absorption is 35 to 50 percent; the ratio of the usage amount of the glass bead and the expanded perlite is 4 to 6, and the mass ratio of the total usage amount and powder is (1:1 ) to ( 2:1); the latex powder is of water-soluble redispersible powder, the solid content thereof is greater than or equal to 98 percent, and the usage amount is less than or equal to 2 percent; the usage amount of the cellulose ether is less than or equal to 0.3 percent; the gas content of an air entraining agent is 3.0 to 5.5 percent, and the usage amount is 0.3 to 0.6 percent. The building insulation mortar disclosed by the invention has the advantages of noninflammable property, thermostability and a good mechanical property.
Description
Technical field
It is alkali-activated carbonatite gelling material prepared by main raw material and the building heat-insulating mortar utilizing this gelling material to prepare that the present invention relates generally to red mud.
Background technology
Alkali-activated carbonatite gelling material is a kind of inorganic coagulation material, and it has and does not fire and thermally-stabilised good feature.Existing result of study shows, this gelling material being main hydration products with hydrated aluminium silicates gel, even if its experience 1000 DEG C is not also decomposed; This gelling material of suitable proportioning, after experience high temperature sintering, intensity rises on the contrary to some extent, and volume shows as microdilatancy.
Building heat-insulating mortar be a kind of with various light material for aggregate, with cement etc. for bonding component, and admixing property-modifying additive, for constructing the material of construction of building surface thermal insulation layer, it typically is the premixing dry-mixed mortar that manufacturing enterprise has prepared.Inorganic heat insulation mortar in thermal insulation mortar has heat insulating, antifreeze, ageing-resistant excellent properties and the cheap price etc. of preventing fires feature, has the market requirement widely.
Utilize not the firing of alkali-activated carbonatite gelling material, Heat stability is good and the performance characteristics such as strength development is fast, viscosifying power is strong, prepare inorganic heat insulation mortar used as bonding component, the strength property and flame retardant properties that make this product are increased substantially.In addition, alkali-activated carbonatite gelling material mainly with red mud, flyash, mine tailing the like waste for main raw material, therefore with it for thermal insulation mortar prepared by bonding component also has the feature of energy-conserving profit waste.
To sum up state institute, with red mud be the alkali-activated carbonatite gelling material prepared of raw material as the bonding component of thermal insulation mortar, not only can promote numerous performances of thermal insulation mortar, but also there is the feature of waste of dissolving.
Through retrieval, have no with alkali-activated carbonatite gelling material as inorganic gel component prepares the Patents of building heat-insulating mortar openly.
Summary of the invention
The object of the invention is to study building heat-insulating mortar prepared by a kind of red mud base alkali-activated carbonatite gelling material, utilize that alkali-activated carbonatite gelling material is not fired, Heat stability is good and the good advantage of mechanical property, with it for bonding component prepares building heat-insulating mortar, promote the performance of this product.
The invention provides a kind of building heat-insulating mortar being inorganic gel component with red mud base alkali-activated carbonatite gelling material; be made up of red mud base alkali-activated carbonatite gelling material, pearlstone, glass bead, latex powder, ether of cellulose, air entrapment agent; wherein said red mud base alkali-activated carbonatite gelling material forms powder by 50 ~ 70% red mud+30% slag powders+0 ~ 20% flyash, this powder by 5% water glass (with Na
2o counts, and accounts for the mass percent of powder, lower same) excite; Described red mud is for newly to discharge red mud from sintering process, and its fineness is that 45 μm of square hole sieves tail over and are not more than 20.0%; The specific surface area of described slag powders is not less than 400m
2/ kg, Activity Rank is not less than S95; The activity index of described flyash is greater than 70, and other performance index meet the requirement of I level ash; The modulus of described liquid soluble glass, not higher than 2.2, is not less than 1.6; Described glass bead is closed perlite, and unit weight is 100 ~ 150kg/m
3, water-intake rate is 35 ~ 50%; Pearlstone is the low-density expanded perlite of 70,100,150 labels, to improve the heat preservation and insulation of thermal insulation mortar, glass bead and pearlstone are used as the aggregate of thermal insulation mortar, and the ratio of the two consumption is 4:6, and total consumption and powder quality are than being 1:1 ~ 2:1; Described latex powder is water-soluble redispersible powder, can be the multipolymer of ethylene/vinyl acetate, the multipolymer of vinyl acetate between to for plastic/tertiary monocarboxylic acid ethene and acrylic acid multipolymer, its solid content is not less than 98%, other all performances meet " redispersible latex powder " (GB/T29594-2013) requirement, and consumption is not more than 2%; Described ether of cellulose can be the etherate of methylcellulose gum, Vltra tears, Natvosol, its on the impact of gelling material time of coagulation be no more than ± 10 minutes, consumption is not more than 0.3%; Described air entrapment agent make mortar in whipping process introducing air and formed in a large number small, close and stabilise bubbles, to improve the heat preservation and insulation of mortar.It can be rosin tree lipid, alkyl and alkylated aromatic sulfonic acid class, fatty alcohol sulfonate class, saponins and the product such as protein salt, oil sulphur hydrochloric acid, and air content is 3.0 ~ 5.5%, consumption 0.3 ~ 0.6%.
The all commercially available acquisition of flyash, liquid soluble glass, pearlstone, glass bead, latex powder, ether of cellulose, air entrapment agent.Modulus of water glass adopt be purchased in water glass add appropriate industrial sheet alkali and the method for boiling adjustment, the modulus being purchased water glass is generally about 2.4.
The preparation method of building heat-insulating mortar of the present invention, relates to following steps:
1) grinding: by oven dry red mud from sintering process and slag milling to setting fineness.
2) homogenizing: according to setting ratio, red mud, slag, flyash are mixed, obtains composite granule.
3) weighing and mix: according to setting consumption, taking latex powder, ether of cellulose and air entrapment agent, even with composite granule mix, obtain thermal insulation mortar powder.
4) mix: add a certain amount of liquid soluble glass and aggregate in powder, stir, obtain thermal insulation mortar.The water that mixing mortar needs joins in liquid soluble glass in advance, and stirs.
Wherein, in step 3) in can add other properties-correcting agent.In addition, if air entrapment agent is liquid, then can in step 4) in together add with water glass solution.
Adopt technique scheme, the thermal insulation mortar excellent property that empirical tests obtains with preparation method of the present invention, can be used for exterior-wall heat insulation.It is pointed out that therefore this thermal insulation mortar also has the function of facing mortar concurrently, while exterior-wall heat insulation, also give buildings red appearance because red mud base alkali-activated carbonatite gelling material takes on a red color.Result of implementation shows, thermal insulation mortar ultimate compression strength reaches 3.6MPa, and far away higher than the 0.4MPa that standard (GB/T20473-2006 " building heat-insulating mortar ") requires, thermal conductivity reaches 0.057W/ (mK), meets standard-required.
The present invention, using red mud base alkali-activated carbonatite gelling material as inorganic gel component, prepares building heat-insulating mortar, has both achieved the recycling of red mud, played again the performance advantage of alkali-activated carbonatite gelling material, and improve thermal insulation mortar performance.
In the present invention, inorganic cementing component is red mud base alkali-activated carbonatite gelling material.This gelling material plays the effect of bonding aggregate and body of wall, and gives thermal insulation mortar flame-retarding characteristic.
In the present invention, red mud used is the red mud from sintering process containing Dicalcium Phosphate (Feed Grade) isoreactivity silicate minerals.This red mud is for newly to discharge red mud, and its gelation activity is higher, only needs to dry, grinding to a 45 μm square hole sieve tails over and be less than 20.0% and namely can be used as gelling material and prepare starting material.Result of implementation of the present invention shows, the alkali-activated carbonatite gelling material adopting this new red mud to prepare is under the short solidifying hardening effect of slag powders, and its condensation is rapid, strength development is fast.
The present invention's slag powders used is obtained by granular water-granulated slag grinding, and its specific surface area is greater than 400m
2/ kg, it plays short solidifying enhancement.Result of implementation of the present invention shows, only prepare alkali-activated carbonatite gelling material with red mud, water glass two component, it condenses slowly at normal temperatures, and strength development is slow.In order to promote the condensation of above-mentioned gelling material, curing temperature must be improved.Such as, curing temperature is increased to 60 DEG C from normal temperature (20 DEG C), and namely gelling material condenses in several tens minutes, and 6 hours intensity can reach more than 25.0MPa.But the construction of thermal insulation mortar and environment for use are physical environment, High Temperature Curing measure can not be taked, therefore this gelling material is not suitable for the inorganic gel component of thermal insulation mortar.In above-mentioned gelling material, mix a certain amount of slag powders, its setting and harden behavior is by different.Result of implementation shows, mixes 30% slag powders, and gelling material can be condensed in 1 hour, and 6 hours intensity can reach more than 20.0MPa.
The present invention's flyash activity index used is greater than 70, and it mainly plays the dual function of physics filling and active ingredient.In addition, owing to containing hollow glass micropearl in flyash, this is not only conducive to reducing slurry density, also helps the heat-insulating property of reinforced mortar.Under alkali-activated carbonatite condition, what flyash reaction generated is N-A-S-H gel.This gel is to Na
+binding ability is strong, thus effectively can suppress the accumulation of salt in the surface soil of mortar.
The present invention's alkali-activator used is liquid soluble glass, and its quality meets the requirement of " industrial metasilicate " (GB/T4209-2008), and its modulus is 1.6 to 2.2, and solid content is 35.0 ~ 50.0%.Acting as of water glass provides high alkali environment, to destroy siloxane bond in red mud, flyash and alumina key, and impels silica and alumina monomer repolymerization.
The present invention's pearlstone used, glass bead are the aglite of mortar, and its Main Function is the heat preservation and insulation improving mortar.
The present invention's latex powder used plays and strengthens bonding force effect, to improve the viscosifying power of thermal insulation mortar; Ether of cellulose used plays thickening, water retention, strengthens the anti-accumulation of salt in the surface soil ability of thermal insulation mortar; Air entrapment agent used plays foaming effect, to improve the heat preservation and insulation of thermal insulation mortar.
Embodiment
Embodiment 1
The powder formed using red mud, slag powders, flyash is as the raw materials of alkali-activated carbonatite gelling material, and wherein slag powders mass percent is 30%, and red mud and flyash quality per-cent summation are 70%.With 5% water glass (with Na
2o counts) as exciting agent, be that aggregate carries out the preparation of red mud base thermal insulation mortar with pearlstone.Latex powder volume 2.0% (accounts for the mass percent of powder with it, lower with), ether of cellulose volume 0.3%, gelatine than 1:1, carry out the preparation and property test of red mud base thermal insulation mortar according to the related request in GB/T20473-2006 " building heat-insulating mortar ".
Mix the impact of flyash on red mud base thermal insulation mortar performance as shown in the table.
Table 1
Known by table 1, along with the increase gradually of doping quantity of fly ash, the dry density of prepared mortar, shrinking percentage and thermal conductivity reduce (being namely optimized) gradually, but strength property is deteriorated.Especially, when doping quantity of fly ash is more than 10%, the strength property of prepared mortar sharply declines.Therefore, under ensureing that mortar has the prerequisite of high strength, during flyash equivalent replace red mud, its volume should be no more than 10%.Even if but the volume of flyash is increased to 20%, although mortar strength declines significantly, it still meets standard-required, and therefore under ensureing that the performance of mortar meets the prerequisite of standard-required, the volume of flyash can be amplified to 20%.
Embodiment 2
In thermal insulation mortar, aggregate is one of principal element affecting its heat-insulating property, and gelling material is then one of the principal element determining its performance such as intensity and contraction, and the performance that therefore gelatine is compared to thermal insulation mortar has material impact.
In the present embodiment, gelling material proportioning is red mud 60%, slag powders 30%, flyash 10%, mixes 5% water glass (with Na
2o counts) as exciting agent; 2.0% latex powder, 0.3% ether of cellulose is mixed in mortar; Aggregate used is pearlstone, and its incorporation accounts for the mass percent of powder with it.Carry out the preparation and property test of red mud base thermal insulation mortar according to the related request in GB/T20473-2006 " building heat-insulating mortar ", result is as shown in the table.
Table 2
Note: gelatine is than the mass ratio for aggregate and gelling material (red mud+slag powders+flyash)
Known by table 2, along with the increase gradually of gelatine ratio, the dry density of prepared mortar diminishes, and shrinking percentage reduces, and ultimate compression strength and cohesive strength also decrease.This is because along with gelatine is than increasing, in mortar, pearlstone content gets more and more, and the density of pearlstone is lower than gelling material, and heat preservation and insulation is better than gelling material, therefore shows as mortar dry density, thermal conductivity to reduce all gradually; Correspondingly gelling material content is then fewer and feweri, and gelling material its cohesive action main, therefore show as mortar strength and reduce gradually.
It can also be seen that from table, when gelatine ratio increases to 2:1, although the properties of mortar (except shrinking percentage) meets the related request in standard GB/T20473-2006, more serious than its strength degradation of sample compared to low gelatine.It is particularly evident that this strength degradation is greater than 1:1 at gelatine ratio.Therefore, if acquisition high-strength mortar, suggestion adopt low gelatine ratio (as 1:1 gelatine than), but gelatine can be improved when requirement of strength is not high compare to optimize other performances.
According to the present embodiment, only adopt the measure of mixing flyash and change gelatine ratio significantly can't improve the resisted shrinkage performance of mortar, also need to take other measures.
Embodiment 3
Except pearlstone, the material such as glass bead, expanded vermiculite is also the conventional aggregate of thermal insulation mortar.In the present embodiment, the powder of gelling material consists of red mud 60%, slag powders 30%, flyash 10%, adopts 5% water glass (with Na
2o counts) excite, gelatine is than being 1:1, and latex powder volume is 2.0%, ether of cellulose volume is 0.3%, and the glass bead/performance impact of pearlstone composite aggregate to thermal insulation mortar is as shown in the table.
Table 3
Known by table 3, along with glass bead and pearlstone ratio increase to 40:60 gradually by 0:100, the dry density of prepared mortar, thermal conductivity, shrinking percentage reduce (being namely optimized) gradually, and the mechanical properties such as cohesive strength also decrease, but ultimate compression strength then rises to some extent; When glass bead and pearlstone ratio continue to increase, although the performances such as the dry density of mortar, thermal conductivity are optimized further, the performance such as cohesive strength and ultimate compression strength all presents the trend reduced gradually.This illustrates when glass bead and pearlstone are mixed again with the ratio of 40:60 above, and grading of aggregate can be made to reach optimum, voidage between aggregate is reduced, thus the performances such as the intensity of mortar, insulation, volume stability are optimized.
Therefore, during using glass bead and pearlstone as composite aggregate, glass bead/pearlstone is about 40:60 and is advisable.
Embodiment 4
Mixing air entrapment agent is the effective measure improving the performances such as cement-based material porosity and insulation.In the present embodiment, the powder of gelling material consists of red mud 60%, slag powders 30%, flyash 10%, adopts 5% water glass (with Na
2o counts) excite, gelatine is than being 1:1 (glass bead: pearlstone=40:60), and latex powder volume is 2.0%, ether of cellulose volume is 0.3%, and air entrapment agent is as shown in the table to red mud base thermal insulation mortar performance impact.
Table 4
Known by table 4, along with the increase gradually of air entrapment agent volume, prepared mortar other performances except intensity are all improved.Obtain in the performance optimized at these, the shrinking percentage of mortar is improved especially obvious.Such as, when air entrapment agent volume reaches 0.3%, its shrinking percentage is reduced to 0.3%, meets the requirement of standard GB/T20473-2006; When air entrapment agent volume is increased to 0.6% further, its shrinking percentage is even low to moderate about 0.1%.Although the increase of air entrapment agent volume causes the strength degradation of mortar obvious, the intensity of all formulas all meets the requirement of standard GB/T20473-2006.Therefore, if acquisition high-strength mortar, the volume of air entrapment agent should control between 0.3 ~ 0.4%; If obtain the mortar that volume stability is more excellent, air entrapment agent volume to 0.6% can be improved.
Embodiment 5
In the present embodiment; " 60% red mud+30% slag powders+10% flyash+5% water glass " is adopted to prepare red mud base alkali-activated carbonatite gelling material; and with this alkali-activated carbonatite gelling material and pearlstone, glass bead for main raw material, gelatine than 1:1, glass bead and pearlstone than the condition for 40:60, latex powder volume 2%, ether of cellulose volume 0.30%, air entrapment agent volume 0.4% under prepare red mud base thermal insulation mortar.And the physical and mechanical property test of mortar is carried out according to the related request in GB/T20473-2006 " building heat-insulating mortar ".Result is as shown in the table.
Table 5
Known by table 5, the red mud base thermal insulation mortar after ratio optimization, its physical properties has met the related request in GB/T20473-2006 " building heat-insulating mortar " all.
Claims (1)
1. the building heat-insulating mortar prepared of a red mud base alkali-activated carbonatite gelling material, it is characterized in that, described mortar is made up of red mud base alkali-activated carbonatite gelling material, pearlstone, glass bead, latex powder, ether of cellulose, air entrapment agent, wherein said red mud base alkali-activated carbonatite gelling material forms powder by 50 ~ 70% red mud+30% slag powders+0 ~ 20% flyash, and this powder accounts for 5% water glass by weight percent and excites; Described red mud is for newly to discharge red mud from sintering process, and its fineness is that 45 μm of square hole sieves tail over and are not more than 20.0%; The specific surface area of described slag powders is not less than 400m2/kg, and Activity Rank is not less than S95; The activity index of described flyash is greater than 70, and other performance index meet the requirement of I level ash; The modulus of described liquid soluble glass, not higher than 2.2, is not less than 1.6; Described glass bead is closed perlite, can be the low-density expanded perlite of 70,100,150 labels, and unit weight is 100 ~ 150kg/m3, and water-intake rate is 35 ~ 50%; Glass bead is 4:6 with the ratio of both pearlstones consumption, and total consumption and powder quality are than being 1:1 ~ 2:1; Described latex powder is water-soluble redispersible powder, can be the multipolymer of ethylene/vinyl acetate, the multipolymer of vinyl acetate between to for plastic/tertiary monocarboxylic acid ethene and acrylic acid multipolymer, its solid content is not less than 98%, other all performances meet " redispersible latex powder " (GB/T29594-2013) requirement, and consumption is not more than 2%; Described ether of cellulose can be the etherate of methylcellulose gum, Vltra tears, Natvosol, and consumption is not more than 0.3%; Described air entrapment agent can be rosin tree lipid, alkyl and alkylated aromatic sulfonic acid class, fatty alcohol sulfonate class, saponins and the product such as protein salt, oil sulphur hydrochloric acid, and air content is 3.0 ~ 5.5%, consumption 0.3 ~ 0.6%.
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| CN115043636A (en) * | 2022-07-15 | 2022-09-13 | 中国建筑材料科学研究总院有限公司 | Insulation board and preparation method thereof |
| CN116891353A (en) * | 2023-08-08 | 2023-10-17 | 中冀建勘集团有限公司 | Red mud and fly ash geopolymer gel material with controllable initial setting time and preparation method thereof |
| CN116891353B (en) * | 2023-08-08 | 2024-05-10 | 中冀建勘集团有限公司 | Red mud and fly ash geopolymer gel material with controllable initial setting time and preparation method thereof |
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Application publication date: 20151230 |