CN109400101B - Wall surface repairing material and preparation method thereof - Google Patents
Wall surface repairing material and preparation method thereof Download PDFInfo
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- CN109400101B CN109400101B CN201811532270.1A CN201811532270A CN109400101B CN 109400101 B CN109400101 B CN 109400101B CN 201811532270 A CN201811532270 A CN 201811532270A CN 109400101 B CN109400101 B CN 109400101B
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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
- C04B28/14—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 calcium sulfate cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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Abstract
The invention relates to the field of building materials, and in particular relates to a wall surface repairing material and a preparation method thereof. The wall repairing material can be used for repairing a loess cave and comprises, by weight, 360-fold 540 parts of glutinous rice slurry, 100-fold 150 parts of silica fume, 100-fold 200 parts of quicklime, 200-fold 300 parts of semi-hydrated gypsum, 500-fold 600 parts of to-be-repaired cave original sample soil, 1-4 parts of fiber material and 10-18 parts of water reducing agent. Its bridging structure to fill or form in the space between the loess granule connects the loess granule, strengthens inside cementation, improves the void structure and the easy problem that erodees of the inside of natural loess, then solves the strong water absorption of loess and meets the characteristic that water is lost in sink to promote the anti freeze-thaw resistance of cave dwelling, anti-weathering, anti dry and wet circulation's of anti-freeze.
Description
Technical Field
The invention relates to the field of building materials, and in particular relates to a wall surface repairing material and a preparation method thereof.
Background
With the implementation of policies of afforestation and returning to agricultural land in northern Shaanxi, the environment in northern Shaanxi is obviously changed, the annual average rainfall is increased, and strong rainfall occurs more in the flood season of 7-9 months. The change of environmental climate makes some loess buildings suffer destruction, and the loess cave dwelling is typical as the loess building destruction, because the increase of annual average rainfall, makes the increase of the internal moisture content of loess around the cave dwelling, and simultaneously, the inside moisture of soil body process of scattering and disappearing leads to the inside moisture of wall body to continuous wall migration in the loess cave dwelling, and this will cause the erosion of the cemented material between the loess wall soil grain to arouse the production of phenomenons such as the shortening of wall, drop, swell, crackle. The wall surface outside the cave is damaged by continuous rain erosion, wind erosion, repeated freeze-thaw cycle, dry-wet cycle and other combined actions, and finally the phenomena of pulverization of the outer wall surface, falling of the wall skin and the like are caused.
The principle of repairing the loess cave wall surface is to ensure the harmony between the repaired wall surface and the surrounding environment and to fully utilize loess as a main material to repair the cave wall surface on the basis of not using modern building materials such as cement and the like so as to achieve the purpose of repairing the old cave wall surface. At present, the loess cave is repaired by mixing the putty powder and loess, bonding components in the putty mainly perform cementation between a bonding wall body and soil particles, but in the repeated water absorption and water loss process of the wall surface, the bonding components continuously expand and contract, finally the bonding characteristics are lost, the erosion resistance and the weathering resistance of moisture are poor, and the durability of the repaired wall surface cannot be ensured. The restoration of the loess building site wall surface lacks an ecological and environment-friendly restoration material, can ensure harmony of a restoration area and the surrounding environment, and has stronger water erosion resistance and ageing resistance on the basis of good air permeability.
At present, research on loess cave wall repair is less, and feasible repair materials are lacked to protect loess cave sites.
Disclosure of Invention
The invention aims to provide a wall repairing material which can not only fill and connect gaps among loess particles, but also improve the problems of the gap structure and the compactness in the natural loess, thereby solving the characteristics of strong water absorption and water collapse of the loess. In addition, the capability of freeze thawing resistance, weathering resistance and dry-wet cycle resistance is improved.
The invention also aims to provide a preparation method of the wall repairing material, which is simple to operate and mild in reaction conditions and can be used for quickly preparing the wall repairing material.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the invention provides a wall repairing material which can be used for repairing a loess cave and comprises, by weight, 360-fold-containing 540 parts of glutinous rice slurry, 100-fold-containing 150 parts of silica fume, 100-fold-containing 200 parts of quick lime, 200-fold-containing 300 parts of semi-hydrated gypsum, 500-fold-containing 600 parts of cave original sample soil to be repaired, 1-4 parts of fiber material and 10-18 parts of water reducing agent.
The invention provides a preparation method of a wall repairing material, which comprises the following steps: mixing glutinous rice pulp, silica fume, quick lime, semi-hydrated gypsum, a fiber material, the original soil of the cave to be repaired and a water reducing agent to form the wall repairing material.
The invention has the beneficial effects that: according to the wall repairing material, through the mutual synergistic effect of 360-plus-540 parts of glutinous rice slurry, 100-plus-150 parts of silica fume, 100-plus-200 parts of quicklime, 200-plus-300 parts of semi-hydrated gypsum, 500-plus-600 parts of to-be-repaired cave original sample soil, 1-4 parts of fiber material and 10-18 parts of water reducing agent, loess can be well bonded on a substrate, meanwhile, the wall repairing material generates a carbonization reaction to generate calcium carbonate crystals to fill gaps among the loess particles or form a bridge structure to connect the loess particles, so that the internal cementation is enhanced, the problems of the gap structure and the easy erosion in the natural loess are solved, the characteristics of strong water absorption and water collapse of the loess are further solved, and the freeze-thaw resistance, the weathering resistance and the dry-wet cycle resistance of the cave are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below.
FIG. 1 is a structural view of a loess cave dwelling before restoration in example 1;
fig. 2 is a structural view of the restored loess cave dwelling of example 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, it should be noted that the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
The wall surface repairing material, the preparation method thereof and the process for repairing the damaged wall surface of the loess cave dwelling in the embodiments of the present invention will be specifically described below.
The embodiment of the invention provides a wall repairing material which can be used for repairing loess cave dwellings, is generally prepared at present and can ensure the repairing effect. Specifically, the cement mortar comprises, by weight, 360-540 parts of glutinous rice slurry, 100-150 parts of silica fume, 100-200 parts of quick lime, 200-300 parts of semi-hydrated gypsum, 500-600 parts of to-be-repaired cave original soil, 1-4 parts of fiber material and 10-18 parts of water reducing agent. Or comprises 400-450 parts of glutinous rice slurry, 120-130 parts of silica fume, 120-150 parts of quick lime, 250-280 parts of semi-hydrated gypsum, 550-570 parts of to-be-repaired cave original soil, 2-3 parts of fiber material and 13-15 parts of water reducing agent in parts by weight.
Can guarantee through the synergism between each above-mentioned material that wall repair material has good intensity and adhesive effect, and guarantee that the calcium carbonate crystal of the carbonization production of wall repair material self can fill in the space between the loess granule, or the bridging structure that forms connects the loess granule, strengthen inside cementation, then improve the void structure and the easy erosion problem of the inside of natural loess, thereby solved the strong water absorption of loess and met the characteristic of water caving, and can further promote anti freeze thawing, anti salt erosion, the ability of anti dry and wet circulation.
Furthermore, the adopted base material is original sample soil of the cave to be repaired, such as loess and the like, so that the small difference between the repaired area and the unrepaired area can be ensured, and the repairing effect is ensured.
Furthermore, the water content of the original soil of the cave to be repaired is 8-12%, and controlling the water content of the original soil of the cave to be repaired is beneficial to improving the fluidity, the strength and the like of the wall repairing material, so that the repairing effect is ensured.
Further, the glutinous rice pulp is 2-3% by mass. The glutinous rice pulp with the mass percentage concentration can ensure that the glutinous rice pulp can well interact with quicklime, semi-hydrated gypsum and other substances, and then the growth of calcium carbonate crystals can be well regulated and controlled. If the concentration of the glutinous rice paste is too low, the prepared wall repairing material is too thin, the bonding performance and strength of the wall repairing material are reduced, and the silica fume and the like cannot fully react with the glutinous rice paste, so that the performance of the solidified soil is reduced. If concentration is too high, then lead to moisture content to hang down excessively, be unfavorable for then with quick lime reaction, be unfavorable for each material misce bene, influence the repair effect of wall repair material then.
Furthermore, quicklime reacts with moisture in the glutinous rice paste to generate slaked lime, a large amount of heat is generated, the glutinous rice paste is further pasted, the molecular chain of the glutinous rice paste is fully extended, hydroxyl carried on the starch branched chain is fully exposed, and then the performance of regulating and controlling the arrangement and growth of calcium carbonate crystals by the hydroxyl in the starch branched chain in the wall repair material is improved.
The generated hydrated lime generates carbonization reaction under the action of moisture and air to generate hexagonal calcium carbonate crystals, the generation amount of the hexagonal calcium carbonate crystals is related to the proceeding degree of the carbonization reaction, and generally, the carbonization degree depends on the saturated ion concentration of calcium hydroxide in a system and the content of carbon dioxide entering the system. The carbonization reaction is a slow process and is completed in a long time, so that the calcium carbonate crystals mainly provide the late strength of the solidified soil. In the carbonization reaction process, hydroxyl in the starch branch chain at the early stage provides a binding site for the growth of calcium carbonate, plays a role of a biological template, regulates and controls the carbonization reaction process, and controls the arrangement, the direction and the crystal form of calcium carbonate crystals. The calcium carbonate crystal that generates can bond and fill the space between the granule to the loess granule, promotes the closely knit nature in the loess wall, improves its inside space structure, has solved the strong water absorption of loess and has met the characteristic of water caving, and can promote its water erosion resistance and anti freeze-thaw ability.
Further, since the amount of water consumed in the reaction between the quicklime and the water is large and the temperature is too high, the amount of the added quicklime needs to be controlled, and if the amount of the added quicklime is too large, the prepared wall repair material has poor fluidity, and the materials are easily mixed unevenly, so that the cohesive property and the strength of the solidified soil are reduced.
Further, the hemihydrate gypsum interacts with the slurry of glutinous rice to provide early strength and a stable environment for the carbonization reaction of hydrated lime, increasing the strength and durability of the solidified soil mass. Specifically, the hemihydrate gypsum can react with water to generate monoclinic dihydrate gypsum and is hardened in a short time, the early strength is provided for a solidified soil body, a stable environment is provided for a carbonization process, and the weather resistance and the dry and wet resistance of the loess wall body can be further improved.
The semi-hydrated gypsum is 2CaSO4·H2O, also known as calcined gypsum, has a microscopic needle-like shape, resembling a gypsum artifact, also in the form of a block, colorless or white, white streaks, resembling a glass luster.
And the silica fume can fill the pores in the solidified soil body, so that the strength of the solidified soil body is further improved. Specifically, certain pores exist in the solidified soil body formed by the glutinous rice pulp, the semi-hydrated gypsum, the quick lime, the hydrated lime and the like, the stabilization of the solidified soil is not facilitated, the silica fume can enter the pores, the pore size of the solidified soil is greatly reduced, the compactness is improved, and the strength of the solidified soil body is further improved. Simultaneously, the space between the silica fume also can be filled to the loess, further promotes the closely knit nature of loess wall.
The water reducing agent can improve the fluidity of the wall repairing material, control the contractibility of the wall repairing material and the like. The glutinous rice paste prepared by the above materials and the above proportion can form a solidified soil body with high strength, scouring resistance and good seepage resistance, and then the damaged wall surface can be well repaired. The embodiment of the invention adopts the water reducing agent as the conventional water reducing agent in the prior art.
Further, the fiber material can prevent the wall surface from cracking after restoration, can reduce the fall-off of the loess wall surface, enables the restoration to have good tensile strength, and can further improve the pore space between loess particles and the compaction problem.
Further, the fiber material is a plant fiber, preferably, any one of hemp cut, coconut shred and wheat straw. The plant fiber can further ensure the function of the fiber, has good connection function, and prevents the wall from cracking.
Further, the length of the fiber material is 1-2 cm. The length of the fiber material is controlled to further ensure the mixing effect of the fiber material and each substance, and ensure that the fiber material can fully exert the effect, and if the fiber is too short or too long, the repair effect is reduced.
The invention also provides a preparation method of the wall repairing material, which comprises the following steps:
mixing glutinous rice pulp, silica fume, quick lime, semi-hydrated gypsum, a fiber material, the original soil of the cave to be repaired and a water reducing agent to form the wall repairing material.
Specifically, the method comprises the following steps: firstly, preparing glutinous rice pulp: pre-gelatinizing glutinous rice flour with water at 80-90 deg.C for 60-90 min. By adopting the pre-gelatinization temperature and time, the glutinous rice and water can be fully gelatinized to obtain glutinous rice pulp, and the damage to the structure of the glutinous rice pulp caused by insufficient or excessive gelatinization of the glutinous rice is avoided. And stirring is continuously carried out in the pre-gelatinization process, the water level is ensured to be unchanged, the agglomeration of glutinous rice flour is avoided, and the full gelatinization of glutinous rice starch is facilitated.
And then cooling the glutinous rice paste to 20-30 ℃, so that the glutinous rice paste can be well and fully mixed with lime, gypsum, the original soil of the cave to be repaired and other substances, and the water loss in the stirring process is reduced.
And then mixing the prepared glutinous rice pulp with silica fume and the to-be-repaired original sample soil of the cave to obtain a first mixture to form viscous slurry, wherein the stirring time is 1-2 minutes, and the stirring speed is 500 plus 600rad/min, and the substances are mixed firstly to prevent the subsequent reaction of the glutinous rice pulp and the quick lime, so that excessive moisture is consumed, and then, the mixing of the materials is easily uneven, therefore, the mixing uniformity is ensured to the mixing, and then, the performance of the wall repairing material is ensured.
And then mixing the mixture with the quick lime, the semi-hydrated gypsum and the water reducing agent in sequence in the first mixture. Adopt above-mentioned mixing sequence can guarantee the interact of materials such as glutinous rice thick liquid and quick lime and hemihydrate gypsum, guarantee the repairing property of wall repair material then. If the mixing sequence is changed, the prepared wall repair material has poor fluidity, low strength of the stone body, poor gap filling effect, poor adhesion and the like.
Specifically, the first mixture and the quicklime are mixed and reacted for 1-2 minutes at a stirring speed of 500-600rad/min, then mixed and reacted with the hemihydrate gypsum at the same stirring speed for 1-2 minutes, and finally mixed and reacted with the water reducing agent for 2-4 minutes at a stirring speed of 500-600 rad/min.
And finally, mixing the thick slurry with the fiber material to form a repair material, namely the wall repair material, and finally adding the fiber material, so that the fiber material can be ensured to exert the effect, and the wall is ensured not to crack easily.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a wall repairing material which comprises 360 parts of glutinous rice pulp, 205 parts of semi-hydrated gypsum, 133 parts of quicklime, 150 parts of wollastonite powder, 13 parts of a water reducing agent, 555 parts of to-be-repaired cave original sample soil and 4 parts of a fiber material. Wherein, the cave original soil to be repaired is loess with water content of 10%, the fiber material is hemp cut fiber with length of 2 cm, and the mass percentage concentration of the glutinous rice pulp is 2.5%.
The embodiment provides a preparation method of a wall repairing material, which comprises the following steps:
firstly, mixing glutinous rice flour and water according to the mass ratio of 39:1 for pre-gelatinization, wherein the pre-gelatinization time is 20 minutes, and the pre-gelatinization temperature is 90 ℃. The resulting slurry was then cooled so that the temperature of the slurry was 20 ℃.
And then stirring and mixing the prepared glutinous rice pulp, silica fume and loess with the water content of 10% to obtain a first mixture, stirring for 1 minute at the stirring speed of 500rad/min, then mixing and reacting the first mixture and the quicklime at the stirring speed of 500rad/min for 1 minute, then mixing and reacting the mixture and the hemihydrate gypsum at the same stirring speed for 1 minute, then mixing and reacting the mixture and a water reducing agent at the stirring speed of 500rad/min for 1 minute, and finally mixing and reacting the mixture and the hemp cut fiber at the stirring speed of 500rad/min for 2 minutes to finally obtain the wall repairing material.
The loess cave dwelling in the northern Shaanxi area is repaired by the wall repairing material in the embodiment 1, the structure before repairing is shown in figure 1, then the wall repairing material in the embodiment 1 is poured and the area to be repaired is repaired, and the repairing result is shown in figure 2.
Examples 2 to 6
The wall surface repair materials provided in examples 2 to 6 are basically the same as the wall surface repair material provided in example 1 in terms of the components, but different in the mixture ratio of the raw materials, and the wall surface repair materials provided in examples 2 to 6 are basically the same as the wall surface repair material provided in example 1 in terms of the preparation method, but different in that the specific operating conditions are changed.
Example 2
The wall repairing material comprises 360 parts of glutinous rice pulp, 100 parts of silica fume, 100 parts of quick lime, 200 parts of semi-hydrated gypsum, 500 parts of to-be-repaired cave original soil, 1 part of fiber material and 10 parts of water reducing agent. Wherein, the original sample soil of the cave to be repaired is loess with the water content of 8 percent, the mass percentage concentration of the glutinous rice pulp is 2 percent, the fiber material is shredded coconut, and the length is 1 cm.
The temperature for preparing the glutinous rice paste is 80 ℃, the pre-gelatinization time is 40 minutes, and the temperature of the cooled glutinous rice paste is 30 ℃.
The first mixture is prepared by stirring for 2 minutes at a rotation speed of 600rad/min, and stirring with quicklime for 2 minutes at a rotation speed of 600rad/min in sequence; the stirring time and the rotating speed with the semi-hydrated gypsum are 2 minutes and 600 rad/min; the stirring time and the rotating speed with the water reducing agent are 2 minutes and 600 rad/min; the time and speed of stirring with the coconut shred is 1 minute at 600 rad/min.
Example 3
The wall repairing material comprises 540 parts of glutinous rice pulp, 150 parts of silica fume, 200 parts of quick lime, 300 parts of semi-hydrated gypsum, 600 parts of to-be-repaired cave original soil, 4 parts of fiber material and 18 parts of water reducing agent. Wherein, the original soil of the cave to be repaired is loess with water content of 12%, the glutinous rice pulp has a mass percentage concentration of 3%, the fiber material is wheat straw, and the length is 1.5 cm.
The temperature for preparing the glutinous rice paste is 85 ℃, the pre-gelatinization time is 35 minutes, and the temperature of the cooled glutinous rice paste is 25 ℃.
The first mixture is prepared by stirring for 1.5 minutes at a rotation speed of 550rad/min, and stirring with quicklime for 1 minute at a rotation speed of 550rad/min in sequence; the stirring time and the rotating speed of the semi-hydrated gypsum are 2 minutes and 550 rad/min; the stirring time and the rotating speed with the water reducing agent are 1 minute and 550 rad/min; the time and speed of stirring with the wheat straw was 2 minutes at 550 rad/min.
Example 4
The wall repairing material comprises 400 parts of glutinous rice pulp, 130 parts of silica fume, 150 parts of quick lime, 280 parts of semi-hydrated gypsum, 550 parts of cave original soil to be repaired, 2 parts of fiber material and 13 parts of water reducing agent. Wherein, the original sample soil of the cave to be repaired is loess with the water content of 11 percent, the mass percentage concentration of the glutinous rice pulp is 2.7 percent, the fiber material is coconut shred, and the length is 1.2 cm.
The temperature for preparing the glutinous rice paste is 87 ℃, the pre-gelatinization time is 25 minutes, and the temperature of the cooled glutinous rice paste is 22 ℃.
Preparing a first mixture, wherein the stirring time is 2 minutes, the rotating speed is 520rad/min, and the stirring time and the rotating speed with quicklime are sequentially 2 minutes and 520 rad/min; the stirring time and the rotating speed with the semi-hydrated gypsum are 2 minutes and 520 rad/min; the stirring time and the rotating speed with the water reducing agent are 1 minute and 520 rad/min; the time and speed of stirring with the coconut shred was 2 minutes at 520 rad/min.
Example 5
The wall repairing material comprises 450 parts of glutinous rice pulp, 150 parts of silica fume, 120 parts of quick lime, 250 parts of semi-hydrated gypsum, 570 parts of cave original soil to be repaired, 3 parts of fiber material and 15 parts of water reducing agent. Wherein, the original soil of the cave to be repaired is loess with the water content of 9 percent, the mass percentage concentration of the glutinous rice pulp is 2.3 percent, the fiber material is wheat straw, and the length is 1.7 cm.
The temperature for preparing the glutinous rice paste is 84 ℃, the pre-gelatinization time is 32 minutes, and the temperature of the cooled glutinous rice paste is 26 ℃.
The first mixture is prepared by stirring for 1.5 minutes at 570rad/min, and stirring with quicklime for 1.5 minutes at 570rad/min in sequence; the stirring time and the rotating speed of the semi-hydrated gypsum are 1.5 minutes and 570 rad/min; the stirring time and the rotating speed with the water reducing agent are 1.5 minutes and 570 rad/min; the time and speed of stirring with the wheat straw was 1.5 minutes at 570 rad/min.
Example 6
The wall repairing material comprises 500 parts of glutinous rice pulp, 140 parts of silica fume, 170 parts of quick lime, 220 parts of semi-hydrated gypsum, 525 parts of to-be-repaired cave original sample soil, 2.5 parts of fiber material and 14 parts of water reducing agent. Wherein, the original sample soil of the cave to be repaired is loess with the water content of 8.5 percent, the mass percentage concentration of the glutinous rice pulp is 2.3 percent, the fiber material is a hemp knife, and the length is 1.7 cm.
The temperature for preparing the glutinous rice paste is 82 ℃, the pre-gelatinization time is 28 minutes, and the temperature of the cooled glutinous rice paste is 27 ℃.
Preparing a first mixture, namely stirring for 1 minute at the rotating speed of 530rad/min, and stirring with quicklime for 1 minute at the rotating speed of 530rad/min in sequence; stirring with the semi-hydrated gypsum for 1 minute at 530 rad/min; the stirring time and the rotating speed with the water reducing agent are 1 minute and 530 rad/min; the time and the rotational speed of stirring with the hemp knife are 1 minute and 530 rad/min.
Comparative example 1: a wall repair material was prepared according to the preparation method provided in example 1, except that quicklime was replaced with the same amount of slaked lime.
Comparative example 2: the wall repairing material is prepared according to the preparation method provided by the embodiment 1, and the difference is that the formula is as follows: 360 parts of glutinous rice pulp, 205 parts of semi-hydrated gypsum, 283 parts of quick lime, 13 parts of water reducing agent, 555 parts of cave original soil to be repaired and 4 parts of fiber material.
Comparative example 3: the wall repairing material is prepared according to the preparation method provided by the embodiment 1, and the difference is that the formula is as follows: 360 parts of glutinous rice pulp, 308 parts of quicklime, 150 parts of wollastonite powder, 13 parts of water reducing agent, 555 parts of original soil of the cave to be repaired and 4 parts of fiber material.
Comparative example 4: the wall repairing material is prepared according to the preparation method provided by the embodiment 1, and the difference is that the formula is as follows: 360 parts of glutinous rice pulp, 205 parts of semi-hydrated gypsum, 283 parts of wollastonite powder, 13 parts of a water reducing agent, 555 parts of cave original soil to be repaired and 4 parts of a fiber material.
Comparative example 5: the wall repairing material is prepared according to the preparation method provided by the embodiment 1, and the difference is that the formula is as follows: 360 parts of glutinous rice pulp, 205 parts of semi-hydrated gypsum, 133 parts of quicklime, 154 parts of wollastonite powder, 13 parts of a water reducing agent and 555 parts of cave original soil to be repaired.
Comparative example 6 a wall repair material was prepared according to the preparation method provided in example 1, except that the glutinous rice slurry, the silica fume, the cave raw soil to be repaired, the quicklime, the hydrated lime, the hemihydrate gypsum and the water reducing agent were directly mixed at one time.
The wall repairing materials of examples 1-6 and comparative examples 1-6 in the same amount are taken for detection, the water absorption of the wall repairing material, the mass loss rate under the soaking condition and the freeze-thaw resistance cycle are detected, the specific detection of the water absorption is referred to as a test method I, the specific detection of the mass loss under the soaking condition is referred to as a test method II, the specific detection of the freeze-thaw resistance cycle is referred to as a test method III, and the specific detection results are referred to as Table 1.
The test method comprises the following steps: and (3) testing water absorption, namely putting the sample in the 28d maintenance age into an electric heating air blowing drying box, drying to constant weight (the drying temperature is 80 ℃), putting the dried sample into a dryer, cooling to room temperature, and testing the water absorption of the sample per unit mass at different times. The water absorption per unit mass of the sample was calculated by the following formula
Wherein WrWater absorption,%; m isoDrying the sample to constant weight, g; m istThe mass of the sample after water absorption at the time point, g.
And a second testing method comprises the following steps: the sample size is phi 61.8mm multiplied by 20mm, the sample is maintained to a specified age under the standard maintenance condition, soaked in water and dried after being soaked for 90 days, and the mass loss condition of the sample under the soaking condition is measured. The disintegration mass loss rate of the sample was calculated by the following formula
Wherein Δ w is the mass change, g; w is a0G is the initial mass of the sample after drying each time; d is mass loss rate,%.
The third test method comprises the following steps: in order to simulate the influence of freeze thawing on solidified soil as a plastering material and detect the freeze thawing resistance of the solidified soil, the stirred slurry is poured into a test mould with the diameter of 120mm multiplied by 5mm, after curing for 24 hours under a dry condition, wax is used for plugging an annular gap between a sample and the test mould, then the test mould is moved into a standard curing condition for curing, and a freeze thawing test is carried out on the sample cured for 28d age. Drying the sample before freeze thawing, wherein each freeze thawing cycle comprises freezing for 3 hours at the temperature of 18 hours and minus 20 plus or minus 2 ℃ and drying for 3 hours in an oven at the temperature of 50 plus or minus 2 ℃. And recording the number of freeze-thaw cycles of large-area peeling damage generated on the surface of the sample in different proportions.
TABLE 1 test results
According to the table 1, the water absorption of the wall repairing material is represented by mass water absorption, the water absorption of the wall repairing material can be influenced by the addition amount of the glutinous rice pulp, the quicklime, the gypsum, the fiber mixing amount and the length, wherein the quicklime has the greatest influence on the water absorption, and the fiber mixing amount improves the water absorption of the wall repairing material.
According to the table 1, the water stability of the wall repairing material is represented by the mass loss rate under the soaking condition, wherein the mass loss rate of lime to the material is the largest, and the fiber is doped to effectively improve the structural stability of the wall repairing material and reduce the mass loss under the soaking condition.
According to the table 1, the durability of the wall repairing material along with seasonal temperature change is represented by testing the number of freeze-thaw cycles, wherein the freeze lime and the gypsum greatly influence the freeze-thaw resistance of the wall repairing material, and the damage of the freeze-thaw cycles to the wall repairing material can be effectively reduced by adding the plant fibers.
As can be seen from Table 1, the silica fume doping greatly affects the water absorption of the wall repair material, and the silica fume doping reduces the internal porosity of the wall repair material compared with the silica fume-free doping, thereby reducing the water absorption. Although the doping sequence of the material components has little influence on the water absorption rate of the wall repairing material, the mass loss rate under the soaking condition and the freeze-thaw resistant cycle frequency, the doping sequence can influence the fluidity of the wall repairing material.
In conclusion, the wall repairing material disclosed by the invention can well bond loess on a substrate through the mutual synergistic effect of 360-540 parts of glutinous rice slurry, 100-150 parts of silica fume, 100-200 parts of quicklime, 200-300 parts of semi-hydrated gypsum, 500-600 parts of to-be-repaired cave original soil, 1-4 parts of fiber material and 10-18 parts of water reducing agent, meanwhile, the wall repairing material generates a carbonization reaction to generate calcium carbonate crystals to fill gaps among loess particles or form a bridge structure to connect the loess particles, so that the internal bonding is enhanced, the problem that the gap structure and the erosion in natural loess are easy is solved, the strong water absorption and water-collapse characteristics of loess are further solved, and the freeze-thaw resistance, the weathering resistance and the dry-wet cycle resistance of the cave are improved.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (7)
1. A wall repairing material is characterized by being used for repairing the wall of a yellow soil cave and comprising, by weight, 540 parts of glutinous rice slurry, 150 parts of silica fume 100-; the length of the fiber material is 1-2 cm, the water content of the original soil of the cave to be repaired is 8-12%, the glutinous rice pulp is 2-3% by mass, and the fiber material is plant fiber.
2. The wall repair material as claimed in claim 1, wherein the wall repair material comprises, by weight, 400-450 parts of the glutinous rice slurry, 120-130 parts of the silica fume, 120-150 parts of the quick lime, 250-280 parts of the semi-hydrated gypsum, 550-570 parts of the original soil of the cave to be repaired, 2-3 parts of the fiber material and 13-15 parts of the water reducing agent.
3. The wall surface repair material according to claim 1 or 2, wherein the fiber material is any one of a hemp knife, a coconut thread and a wheat straw.
4. A method for preparing the wall repair material of claim 1, comprising the steps of:
mixing glutinous rice pulp, silica fume, quick lime, semi-hydrated gypsum, a fiber material, the original soil of the cave to be repaired and a water reducing agent to form the wall repairing material.
5. The preparation method according to claim 4, wherein the wall repair material is a first mixture formed by mixing the glutinous rice slurry, the silica fume, and the cave raw soil to be repaired; then the first mixture is sequentially mixed with the quick lime, the semi-hydrated gypsum and the water reducing agent to form viscous slurry; the viscous slurry is then mixed with the fibrous material to form a repair material.
6. The preparation method according to claim 5, wherein the glutinous rice slurry is prepared by stirring glutinous rice flour with water at 80-90 ℃ for 60-90 minutes.
7. The preparation method according to claim 6, wherein the first mixture is obtained by stirring the glutinous rice slurry and the silica fume for 1-2 minutes under the conditions of 500-600 rpm, and then stirring the mixture and the original soil for the cave to be repaired for 1-2 minutes under the conditions of 500-600 rpm.
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| CN111398568A (en) * | 2020-04-23 | 2020-07-10 | 六盘水师范学院 | Solid-liquid coupling physical similarity simulation material for coal seam mining and use method thereof |
| CN112608755B (en) * | 2020-12-09 | 2022-03-29 | 中建三局集团有限公司 | Composite shrinkage reducing agent suitable for high-flow collapsible loess and application thereof |
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| CN105084848A (en) * | 2015-08-14 | 2015-11-25 | 武汉理工大学 | Repairing material for weathering ganged brick |
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