CN113979689A - Controllable low-strength material using engineering slurry and preparation method thereof - Google Patents
Controllable low-strength material using engineering slurry and preparation method thereof Download PDFInfo
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- CN113979689A CN113979689A CN202111142240.1A CN202111142240A CN113979689A CN 113979689 A CN113979689 A CN 113979689A CN 202111142240 A CN202111142240 A CN 202111142240A CN 113979689 A CN113979689 A CN 113979689A
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0418—Wet materials, e.g. slurries
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
- C04B2111/00672—Pointing or jointing materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a controllable low-strength material utilizing engineering slurry and a preparation method thereof. The weight parts of the components are as follows: 2400 parts of engineering slurry, 250 parts of steel slag, 180 parts of cement and 18-35 parts of calcium formate; the preparation method comprises flocculation precipitation dehydration of the engineering slurry, formulation customization and mixing and stirring of all the components. The controllable low-strength material and the preparation method thereof open up a new way for resource utilization of two wastes of engineering mud and steel slag, have simple operation steps, have low manufacturing cost, excellent working performance, up-to-standard and adjustable strength performance and good environmental protection value compared with the traditional method.
Description
Technical Field
The invention relates to a preparation method of a controllable low-strength material in the technical field of building production, in particular to a controllable low-strength material prepared by utilizing engineering slurry and a preparation method of a controllable low-strength material prepared by utilizing the engineering slurry.
Background
The controllable Low-Strength Material (CLSM) is a novel cement-based backfill Material defined by American Concrete Institute (ACI), has the characteristics of Low Strength, self-leveling, self-filling and self-compacting, has good backfill effect on special parts which are difficult to tamp by the traditional backfill Material in engineering construction, such as three backs in road engineering, pipeline grooves in municipal engineering and the like, and is widely applied to regions in Europe and America, Japan and the like.
The evaluation indexes of the controllable low-strength material mainly comprise working performance (fluidity and bleeding property) and mechanical performance (unconfined compressive strength). According to the fluidity test method ASTM-D6103 standard: the fluidity is low when the fluidity is less than 150mm, and the method is only suitable for backfill projects such as pipe ditches, roadbeds and the like in larger spaces; the fluidity is 150mm < the fluidity is 200mm, and the method is suitable for general backfill engineering; the fluidity is high, namely the fluidity is more than 200mm, so that the method is suitable for most backfilling projects, and is particularly suitable for construction environments with narrow operation spaces or dead angles. According to the ASTM C232 standard, the bleeding rate of the controllable low-strength material is controlled to be 5% at home and abroad, and the high bleeding rate brings about larger post-construction settlement. In practice, the controllable low strength material 28D is required to have an unconfined compressive strength of less than 2.1MPa, according to ASTM D483 test method and the american concrete association guidelines. When the pressure is between 0.3MPa and 1.1MPa, the future excavation is facilitated, only a small-sized excavation machine is needed, the energy is saved, the environment is protected, and the cost is low; when it is greater than 1.1MPa, it is not favorable for future excavation.
The traditional controllable low-strength material consists of aggregate (sand), curing agent (cement), water and additives (water reducing agent, early strength agent and the like), compared with cement mortar, the water-cement ratio is large, the water demand is high, the strength requirement is low, and the controllable low-strength material is an ideal way for resource utilization of various building and industrial wastes, such as silt, fly ash, slag, incinerator ash, coal gangue, building residue and the like, and is well applied to preparation of the controllable low-strength material. However, compared with other disposal methods, the materials have no advantage in cost for preparing the controllable low-strength material, and researches of scholars show that the comprehensive cost for preparing the controllable low-strength material by utilizing the building residue soil is 150-200 yuan/m3And the engineering applicability is low, and the large-scale development in China is not realized.
The engineering slurry is produced in the construction processes of drilling pile foundation construction, underground continuous wall construction, slurry shield construction, horizontal directional drilling, slurry jacking pipe and the like, and is one of construction wastes. With the continuous acceleration of the urbanization process in China, the engineering mud yield is increased sharply, and the absorption pressure is increased gradually. At present, the main consumption modes of the engineering mud in China are outward transportation discharge and pit backfill, and because the water content of the engineering mud is high, the consumption modes have poor sustainability and great potential safety hazard, and the popularization of the dehydration reduction of the engineering mud is imperative, for example, all the engineering mud specified in the Wenzhou city must be dehydrated to the specified water content to be consumed at the tail end. However, the engineering slurry has high fine particle content, so that the dehydration difficulty is high, mechanical dehydration modes such as a filter press and the like are often adopted, the treatment cost is high, if a traditional treatment method of firstly dehydrating and then burying is still adopted, the comprehensive treatment cost of the slurry is greatly increased under the current policy, and therefore, the novel treatment method of the engineering slurry with low exploration cost, safety and environmental protection becomes a difficult problem in the current places.
The engineering mud contains a large amount of soil particles and water, and if the engineering mud is used for preparing a controllable low-strength material, the two components can be simultaneously applied. The high water content of the slurry enables the controllable low-strength material to be prepared without additional water, and the high water demand of the controllable low-strength material enables the slurry to be dewatered only by flocculation precipitation or without dewatering before use, so that two purposes are achieved, and energy conservation and emission reduction are achieved. In addition, the traditional controllable low-strength material has high bleeding property which is usually 5-10% according to the existing research data due to high water content, and the engineering mud has high bentonite content, so that the engineering mud has good water retention, low bleeding rate and small post-construction settlement, and is an ideal material for preparing the controllable low-strength material. At present, no relevant research is available at home and abroad.
The prior related granted inventions mainly fall into two categories:
(1) CN 101607260B and CN 103030347B are taken as representatives, natural sandstone or industrial waste is taken as aggregate, cement, fly ash and the like are taken as curing agents, additives are added, and water is added for mixing to prepare a finished product;
(2) using CN 104496222B as representative, adopting calcining form to make raw material (carbide slag, steel slag, coal gangue) form silicate substance at high temperature, then adding water to make into finished product.
If the formula and the preparation method in the patent are used for preparing the controllable low-strength material by utilizing the engineering slurry, the following defects exist:
(1) the raw materials except water are all solid, and the slurry is in a liquid state, so the preparation method is not suitable;
(2) on the aggregate component, natural sand and machine-made sand have high market price; recycled aggregate, copper ore tailings and the like are also recycled in other engineering fields such as roadbed engineering and the like at present, and show higher performance, the potential of the materials is fully exploited, the market price is gradually increased, and therefore, the economic applicability is lower;
(3) in the curing agent component, the fly ash mostly adopted in the patent has high market price, even part of areas exceed the price of cement, and the economic applicability is lower;
the existing formulations and methods of preparation of the above-mentioned patents are therefore not suitable for the preparation of controlled low strength materials using engineering muds.
With the development of the production field of controllable low-strength materials, a controllable low-strength material utilizing engineering slurry and a preparation method thereof are lacked in the prior art so as to develop a new way for resource utilization of the engineering slurry.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a controllable low-strength material utilizing engineering slurry and a preparation method matched with the material. The preparation method combines the physical property characteristics of the engineering slurry, considers the whole process from the original slurry to the finished product, provides a control and adjustment method of fluidity and backfill strength, and provides guidance for the actual engineering.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the controllable low-strength material utilizing the engineering slurry comprises the following specific components in parts by weight:
2000 portions of engineering slurry and 2400 portions;
250 portions of steel slag and 1000 portions of slag;
180 portions of cement and 350 portions of cement;
18-35 parts of calcium formate.
The engineering mud is produced from waste engineering mud generated in the processes of drilling pile foundation construction, underground diaphragm wall construction, slurry shield construction, horizontal directional drilling and slurry pipe-jacking construction, muck sand washing engineering and the like, and the dry basis water content is more than 140% before dehydration.
After the engineering mud is dewatered by flocculation precipitation, the dry basis water content is reduced to between 100% and 140%.
The steel slag is produced from waste steel slag obtained by steelmaking of a basic oxygen furnace, and is crushed and screened to be below 10 meshes.
The cement is commercially available 425 ordinary portland cement; the calcium formate is commercial industrial grade calcium formate and is in a white powdery solid form.
Secondly, a preparation method of the controllable low-strength material by utilizing the engineering slurry comprises the following steps:
s1: performing flocculation precipitation treatment on the engineering slurry, testing the water content of the dehydrated dry basis to ensure that the water content is between 100 and 140 percent, obtaining the dehydrated slurry, and determining the using amount of the engineering slurry;
s2: gradually adding steel slag into the dewatered slurry, and determining the specific use amount of the obtained steel slag when the fluidity is larger than the expected lower limit value;
the steel slag is added, so that the strength of the controllable low-strength material is improved, the cost is greatly reduced, and the preparation of the low-cost high-efficiency high-quality material is realized.
S3: calculating the weight parts of cement and calcium formate in the formula by adopting a formula according to the expected value of the backfill strength in the 28d age;
s4: pouring the components into a stirrer, and stirring for 5-10min to uniformly mix the components to obtain the controllable low-strength material finished product.
In S1, determining the amount of the engineering mud is specifically determined in the following manner: the weight portion of the engineering mud is 1000+10 multiplied by the dry basis water content (%) of the mud, the lower limit is 2000 portions, and the upper limit is 2400 portions.
The desired lower limit of the fluidity in S2 is 200 mm. In the S2, the adopted initial steel slag is 250 parts by weight, and the upper limit part by weight is 1000 parts.
In S3, the formula used is as follows,
UCS28d＝(1+kS)(m-tW/C)
wherein, UCS28d28d age unconfined compressive strength (kPa), S is steel slag weight part, k is steel slag influence coefficient, m is constant, t is water-cement ratio influence coefficient, W is water weight part in slurry, C is cement weight part, UCS28dThe design value is not lower than 350 kPa;
the dosage of the calcium formate is 10 percent of the weight of the cement.
The formula adopted in S3 is provided by statistical analysis based on a large amount of example data developed by the present invention.
And the stirrer adopted in the step S4 is a cement mortar stirrer.
The invention has excellent performance, and can specifically reach the following technical indexes:
fluidity range: 191mm to 281mm (according to ASTM D6103 standard);
the bleeding rate range is as follows: 0.042-0.27% (according to ASTM C232 standard);
28d unconfined compressive strength range: 350kPa to 759kPa (according to ASTM D4832 standard);
28d elastic modulus range: 50.96MPa to 61.22 MPa;
28d shrinkage linear shrinkage range: 0.091% -0.226% (according to JGJT70-2009 standard).
The controllable low-strength material can be used as a backfill material in a gap to adjust the pouring in a narrow space to achieve the required strength, and the technical problem that the backfill material with low cost is difficult to treat in the narrow space such as the gap is solved.
The invention has the beneficial effects that:
(1) the invention makes up the technical blank of adopting the engineering slurry as the raw material in the field of controllable low-strength materials, opens up a new way for resource utilization of the engineering slurry, takes the steel slag as the auxiliary material, uses waste to treat waste due to material application, has low manufacturing cost and has better environmental protection value.
(2) The matched preparation method is different from the prior patent achievement, and is based on the principles of simplified working procedures and simple operation, no additional water is needed in the preparation process, and the engineering slurry is not needed to be prepared into solid particles. The invention directly adopts the water in the slurry after flocculation precipitation dehydration as the component water, reduces the dehydration pressure of the slurry, realizes the purposes of waste reclamation on the spot and no field, saves water resources and achieves multiple purposes.
(3) The controllable low-strength material has excellent fluidity (more than 200mm), better self-leveling and self-compacting filling performance and no need of vibration; the 28d unconfined compressive strength is moderate (more than 0.3MPa and less than 1.1MPa) and can be effectively adjusted by changing the mass fraction of the steel slag, so that for municipal pipeline groove backfilling, secondary excavation and maintenance or diversion at the later stage are facilitated, and small-sized mechanical excavation can be adopted, so that construction is facilitated; low bleeding property (less than 5 percent) and small post-construction settlement.
In conclusion, the controllable low-strength material and the preparation method thereof open up a new way for resource utilization of engineering mud and steel slag, have simple operation steps, have low manufacturing cost, excellent working performance, up-to-standard and adjustable strength performance and good environmental protection value compared with the traditional method.
Drawings
FIG. 1 is a flow chart of a method of preparing a controlled low strength material using an engineered mud according to the present invention;
FIG. 2 is a graph showing the relationship between the amount of slag and the fluidity in the example developed by the present inventors;
FIG. 3 is a graph of the relationship between the water-cement ratio and the unconfined compressive strength in an example developed by the inventors;
FIG. 4 is a graph showing the relationship between the fraction of steel slag and unconfined compressive strength in an example conducted by the inventors;
FIG. 5 is a diagram showing the prediction of cement-ash ratio and unconfined compressive strength of different steel slag fractions obtained by statistical analysis by the inventors.
Detailed Description
The present invention will be described in further detail with reference to examples. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The examples of the invention are as follows:
example 1:
the CLSM of the embodiment comprises the following components in parts by weight:
2400 parts of engineering slurry;
667 parts of steel slag;
350 parts of cement;
35 parts of calcium formate.
The engineering mud is generated in the construction process of the drilling pile foundation, and the water content of a dry base before dehydration is 175%.
After the engineering mud is dewatered by flocculation precipitation, the water content of a dry base is reduced to 140.54 percent.
The steel slag is produced in a basic oxygen furnace (basic oxygen furnace) steel-making method, and is crushed and screened to below 10 meshes.
The cement is commercially available 425 ordinary portland cement.
The calcium formate is commercial industrial grade calcium formate and is in a white powdery solid form.
The invention relates to a matched preparation method of a controllable low-strength material by utilizing engineering slurry, which comprises the following steps:
s1: performing flocculation precipitation treatment on the engineering slurry, and testing to obtain 140.54% of the dehydrated dry basis water content, so as to determine that the using amount of the engineering slurry is 2400 parts by weight;
s2: gradually adding steel slag into the dewatered slurry to obtain the relation between the steel slag consumption and the fluidity as shown in figure 2, and determining that the specific steel slag consumption is 667 parts by weight according to the fluidity expected value of 260 mm;
s3: the empirical formula is UCS obtained by analyzing the data shown in the attached figures 3, 4 and 528dDetermining that the water cement ratio is 4, the cement amount is 350 parts by weight and the calcium formate amount is 35 parts by weight according to the expected value 620kPa of 28d age backfill strength (1+0.00043 XS) × (848.7-93.39 XW/C);
s4: pouring the components into a stirrer, and stirring for 5-10min to uniformly mix the components to obtain a CLSM finished product.
The performance index of the CLSM of this example is as follows:
(1) 264mm of fluidity (according to ASTM D6103 standard) belonging to the class of high-flow materials (> 200 mm);
(2) the bleeding rate is 0.19 percent (according to ASTM C232 standard), the bleeding rate is lower (less than 5 percent), and the stability is strong;
(3)28D unconfined compressive strength 706kPa (according to ASTM D4832 standard) is between 0.3MPa and 1.1MPa, and the practical applicability is strong;
(4)28d modulus of elasticity 60.33 MPa;
(5) the 28d shrinkage linear shrinkage rate was 0.091% (according to JGJT 70-2009).
The measured result of the fluidity is more consistent with the expectation, and the measured result of the 28d unconfined compressive strength is improved by about 14 percent compared with the expectation, which shows that the formula determined by the empirical formula in the invention is relatively conservative and has higher safety.
Example 2:
the CLSM of the embodiment comprises the following components in parts by weight:
2400 parts of engineering slurry dry basis;
428 parts of steel slag;
350 parts of cement;
35 parts of calcium formate.
The engineering mud is generated in the construction process of the drilling pile foundation, and the water content of a dry base before dehydration is 175%.
After the engineering mud is dewatered by flocculation precipitation, the water content of a dry base is reduced to 140.54 percent.
The steel slag is produced in a basic oxygen furnace (basic oxygen furnace) steel-making method, and is crushed and screened to below 10 meshes.
The cement is commercially available 425 ordinary portland cement.
The calcium formate is commercial industrial grade calcium formate and is in a white powdery solid form.
The performance index of the CLSM of this example is as follows:
(1) a flow of 266mm (according to ASTM D6103);
(2) bleeding rate 0.17% (according to ASTM C232 standard);
(3)28D unconfined compressive strength 627kPa (according to ASTM D4832);
(4)28d modulus of elasticity 54.67 MPa;
(5) the 28d linear shrinkage was 0.189% (according to JGJT 70-2009).
Example 3:
the CLSM of the embodiment comprises the following components in parts by weight:
2000 parts of engineering slurry dry basis;
250 parts of steel slag;
250 parts of cement;
25 parts of calcium formate.
The engineering mud is generated in the construction process of the drilling pile foundation, and the water content of a dry base before dehydration is 175%.
After the engineering mud is dewatered by flocculation precipitation, the water content of a dry base is reduced to 100.21 percent.
The steel slag is produced in a basic oxygen furnace (basic oxygen furnace) steel-making method, and is crushed and screened to below 10 meshes.
The cement is commercially available 425 ordinary portland cement.
The calcium formate is commercial industrial grade calcium formate and is in a white powdery solid form.
The performance index of the CLSM of this example is as follows:
(1) a fluidity of 216mm (according to ASTM D6103);
(2) bleeding rate 0.042% (according to ASTM C232 standard);
(3)28D unconfined compressive strength 529kPa (according to ASTM D4832);
(4)28d modulus of elasticity 51.06 MPa;
(5) the 28d shrinkage linear shrinkage was 0.217% (according to JGJT 70-2009).
Example 4:
the CLSM of the embodiment comprises the following components in parts by weight:
2400 parts of engineering slurry dry basis;
1000 parts of steel slag;
350 parts of cement;
35 parts of calcium formate.
The engineering mud is generated in the construction process of the drilling pile foundation, and the water content of a dry base before dehydration is 175%.
After the engineering mud is dewatered by flocculation precipitation, the water content of a dry base is reduced to 140.54 percent.
The steel slag is produced in a basic oxygen furnace (basic oxygen furnace) steel-making method, and is crushed and screened to below 10 meshes.
The cement is commercially available 425 ordinary portland cement.
The calcium formate is commercial industrial grade calcium formate and is in a white powdery solid form.
The performance index of the CLSM of this example is as follows:
(1) a fluidity of 250mm (according to ASTM D6103);
(2) bleeding rate 0.27% (according to ASTM C232 standard);
(3)28D unconfined compressive strength of 759kPa (according to ASTM D4832);
(4)28d elastic modulus 61.22 MPa;
(5) the 28d linear shrinkage is 0.099% (according to JGJT70-2009 standard).
The main performance indexes and the specification requirements of the embodiments are shown in table 1, the fluidity of the controllable low-strength material exceeds 8% -33% of the highest level requirement, and the working performance is excellent; the 28d unconfined compressive strength meets the standard requirement and can be adjusted according to a formula, the measured value is 0.5-14% higher than the expected value, and the reliability is high; the bleeding rate is far less than 5% of the specification requirement, and the stability is good. The preparation method of the controllable low-strength material can effectively utilize water in the engineering slurry, so that additional water is not needed in the preparation process, water resources are saved, the pressure of slurry dehydration is reduced, the operation steps are simple, a new way is opened for resource synergistic utilization of two wastes of the engineering slurry and the steel slag, and the preparation method has good environmental protection value.
TABLE 1 Main Performance index of the examples
One skilled in the art can, using the teachings of the present invention, make numerous changes and modifications to the disclosed embodiments without departing from the spirit and scope of the present invention as defined by the appended claims. Any modifications and equivalent variations of the above-described embodiments, which are made in accordance with the technical spirit and substance of the present invention, fall within the scope of protection of the present invention as defined in the claims.
Claims (10)
1. A controllable low-strength material utilizing engineering slurry is characterized in that the controllable low-strength material comprises the following specific components in parts by weight:
2000 portions of engineering slurry and 2400 portions;
250 portions of steel slag and 1000 portions of slag;
180 portions of cement and 350 portions of cement;
18-35 parts of calcium formate.
2. The controllable low strength material using engineering mud of claim 1, wherein:
the engineering mud is produced from waste engineering mud generated in the processes of drilling pile foundation construction, underground diaphragm wall construction, slurry shield construction, horizontal directional drilling and slurry pipe-jacking construction, muck sand washing engineering and the like, and the dry basis water content is more than 140% before dehydration.
3. The controllable low strength material using engineering mud of claim 2, wherein:
after the engineering mud is dewatered by flocculation precipitation, the dry basis water content is reduced to between 100% and 140%.
4. The controllable low strength material using engineering mud of claim 1, wherein:
the steel slag is produced from waste steel slag obtained by steelmaking of a basic oxygen furnace, and is crushed and screened to be below 10 meshes.
5. The controllable low strength material using engineering mud of claim 1, wherein:
the cement is commercially available 425 ordinary portland cement; the calcium formate is commercial industrial grade calcium formate and is in a white powdery solid form.
6. The method for preparing the controllable low-strength material by using the engineering sludge as claimed in claim 1, which is characterized in that: the method comprises the following steps:
s1: performing flocculation precipitation treatment on the engineering slurry, testing the water content of the dehydrated dry basis to ensure that the water content is between 100 and 140 percent, obtaining the dehydrated slurry, and determining the using amount of the engineering slurry;
s2: gradually adding steel slag into the dewatered slurry, and meeting the condition that the fluidity is greater than an expected lower limit value;
s3: calculating the weight parts of cement and calcium formate in the formula by adopting a formula according to the expected value of the backfill strength in the 28d age;
s4: pouring the components into a stirrer, and stirring for 5-10min to uniformly mix the components to obtain the controllable low-strength material finished product.
7. The method for preparing a controllable low-strength material using engineering sludge according to claim 6, wherein: in S1, determining the amount of the engineering mud is specifically determined in the following manner: the weight portion of the engineering mud is 1000+10 multiplied by the dry basis water content (%) of the mud.
8. The method for preparing a controllable low-strength material using engineering sludge according to claim 6, wherein: in the S2, the adopted initial steel slag is 250 parts by weight, and the upper limit part by weight is 1000 parts.
9. The method for preparing a controllable low-strength material using engineering sludge according to claim 6, wherein: in S3, the formula used is as follows,
UCS28d＝(1+kS)(m-tW/C)
wherein, UCS28d28d age unconfined compressive strength (kPa), and S is the weight portion of the steel slagK is the influence coefficient of steel slag, m is a constant, t is the influence coefficient of water-cement ratio, W is the weight part of water in the slurry, C is the weight part of cement, UCS28dThe design value is not lower than 350 kPa;
the dosage of the calcium formate is 10 percent of the weight of the cement.
10. The method for preparing a controllable low-strength material using engineering sludge according to claim 6, wherein: and the stirrer adopted in the step S4 is a cement mortar stirrer.
The invention has excellent performance, and can specifically reach the following technical indexes:
fluidity range: 191mm to 281mm (according to ASTM D6103 standard);
the bleeding rate range is as follows: 0.042-0.27% (according to ASTM C232 standard);
28d unconfined compressive strength range: 350kPa to 759kPa (according to ASTM D4832 standard);
28d elastic modulus range: 50.96MPa to 61.22 MPa;
28d shrinkage linear shrinkage range: 0.091% -0.226% (according to JGJT70-2009 standard).
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