CN116023097A - Concrete for underground engineering construction by using granite tunneling hole slag as aggregate and preparation method thereof - Google Patents
Concrete for underground engineering construction by using granite tunneling hole slag as aggregate and preparation method thereof Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 115
- 230000005641 tunneling Effects 0.000 title claims abstract description 106
- 239000010438 granite Substances 0.000 title claims abstract description 93
- 238000010276 construction Methods 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000011398 Portland cement Substances 0.000 claims abstract description 44
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 34
- 239000008030 superplasticizer Substances 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 12
- 238000013461 design Methods 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 34
- 238000009412 basement excavation Methods 0.000 claims description 20
- 238000007873 sieving Methods 0.000 claims description 17
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000004568 cement Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000002699 waste material Substances 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 9
- 239000003469 silicate cement Substances 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 abstract description 2
- 238000011056 performance test Methods 0.000 description 17
- 239000011435 rock Substances 0.000 description 9
- 238000005406 washing Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 239000011798 excavation material Substances 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 239000004575 stone Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses concrete for underground engineering construction by taking granite tunneling hole slag as aggregate and a preparation method thereof, wherein the concrete comprises the following components in parts by mass: 550-650 parts of Portland cement, 1600-1700 parts of granite tunneling hole slag, 11-13 parts of anti-mud polycarboxylate superplasticizer and 220-260 parts of water. The preparation method comprises sequentially adding granite tunneling hole slag, portland cement and anti-mud type polycarboxylate water reducer into concrete stirring equipment, stirring, adding stirring water, continuously stirring, pouring out and detecting the performance of the freshly mixed concrete, vibrating and naturally curing if the design index requirement is met. The concrete formula and the preparation process for the underground engineering construction are simple, the influence of poor quality of the tunneling hole slag is overcome, and the direct utilization of the tunneling hole slag and the in-situ preparation of the high-flow-state concrete for the underground engineering construction are realized.
Description
Technical Field
The invention belongs to the field of building concrete engineering, and particularly relates to concrete for underground engineering construction by using granite tunneling hole slag as aggregate and a preparation method thereof.
Background
In the underground engineering construction process, a large amount of granite tunneling hole slag can be generated in the tunneling and excavation process of the cantilever type tunneling machine by the granite rock body, and if the hole slag is directly discarded, the slag can be accumulated, so that the environment is polluted, and resources are wasted. Considering that a large amount of concrete materials are also required for underground engineering construction, if the concrete is prepared by using tunneling hole slag if local materials are available, a large amount of fields and transportation cost required by hole slag piling can be saved.
The granite tunneling hole slag is from tunneling construction of granite rock mass with higher weathering degree, and the nominal diameter of particles is mostly within 25mm, so that crushing treatment is not needed, and the granite tunneling hole slag can be used as aggregate by simple screening. However, the strength of the tunneling hole slag generated by weathered rock is not high, the tunneling hole slag is limited by the rock breaking process of the rotary cutter head for cutting rock mass, the content of needle-shaped aggregate in the tunneling hole slag is high, the mud content (except stone powder, the rest of clay, silt, fine powder and other particles with the particle size smaller than 80 mu m) is high, and the blue absorption amount exceeds the standard. The quality of the tunneling hole slag is not satisfied with the standard requirements specified in GB/T14684-2001 "sand for building", JGJ52-2006 "sand for ordinary concrete, stone quality and inspection method Standard".
At present, the work of preparing concrete by utilizing rock excavation materials at home and abroad is mainly focused on two aspects, namely, how to prepare the rock excavation materials into aggregate with the quality meeting the requirements of related standards, and research on the influence of the aggregate on the performance of the concrete, but the research on preparing concrete by directly utilizing tunneling excavation materials is not reported. Although the chinese patent document CN109734381A, CN110357520A, CN112250381a relates to concrete preparation methods using hole slag and excavation materials as aggregate, these methods all require secondary processing of the collected hole slag and excavation materials, for example, using the excavation materials to prepare machine-made sand stone as aggregate, wherein pretreatment such as washing, drying, screening, etc. is included to improve the grading and reduce the mud content, and the prior art does not directly use the mud-containing tunneling hole slag to prepare concrete.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects of the prior art, and provides concrete for underground engineering construction by adopting granite tunneling hole slag as aggregate and a preparation method thereof, wherein the granite tunneling hole slag with the characteristic of high mud content is directly used as the aggregate, so that the problems of occupied site and rock resource waste of the underground engineering granite tunneling material are solved, and a new source is provided for the aggregate of the high-flow-state concrete for underground engineering construction.
In order to solve the technical problems, the invention adopts the following technical scheme.
The concrete for underground engineering construction adopting granite tunneling hole slag as aggregate comprises the following components in parts by mass: 550-650 parts of Portland cement, 1600-1700 parts of granite tunneling hole slag, 11-13 parts of anti-mud polycarboxylate superplasticizer and 220-260 parts of water.
The concrete for underground engineering construction adopting the granite tunneling hole slag as the aggregate is preferably 650 parts of ordinary Portland cement, 1600 parts of granite tunneling hole slag, 13 parts of anti-mud type polycarboxylate superplasticizer and 245-260 parts of water.
The concrete for underground engineering construction adopting the granite tunneling hole slag as the aggregate is preferably prepared by directly sieving the tunneling waste slag generated by granite tunneling excavation through a square hole sieve with the nominal diameter of 25mm without washing and sieving blocks with the diameter of more than 25 mm; the water content of the granite tunneling hole slag is 3% -4%, the blue absorption MB value is 9.1-11.5, the single-stage maximum crushing value is 60% -80%, the particles (stones) with the particle diameters of 5-25 mm are continuously distributed, the particles (sand) with the particle diameters of less than 5mm account for 20% -25%, and the particles (sand) with the particle diameters of less than 5mm account for 75% -80%.
The concrete for underground engineering construction using granite tunneling hole slag as aggregate is preferably high-flow concrete, and is used for pouring construction of an internal engineering structure (especially an engineering structure with low requirement on durability) of underground engineering, wherein the slump of the concrete for underground engineering construction is more than 160mm, the 7d compressive strength is more than 25MPa, and the 28d compressive strength is more than 40MPa.
In the concrete for underground engineering construction, which adopts the granite tunneling hole slag as the aggregate, preferably, the anti-mud type polycarboxylate water reducer is the anti-mud type polycarboxylate water reducer meeting the technical requirements of GB/T8076-2008 concrete admixture, and the water reducing rate is 30% -35%. The water reducing rate refers to the percentage of the unit water consumption of the water reducing agent-doped concrete and the unit water consumption of the water reducing agent-undoped concrete when the slump of the two types of concrete is basically the same.
The concrete for underground engineering construction adopting the granite tunneling hole slag as the aggregate is preferably Portland cement, wherein the Portland cement is 42.5-grade Portland cement meeting the technical requirements of GB175-2020 general Portland Cement, and the specific surface area is 300kg/m 3 ～350kg/m 3 The water consumption of the standard consistency is 24-28%, and the compressive strength of the 28d rubber sand is more than 48.9MPa.
The invention also provides a preparation method of the concrete for underground engineering construction by adopting the granite tunneling hole slag as aggregate, which comprises the following steps of:
sequentially adding the granite tunneling hole slag, the silicate cement and the anti-mud type polycarboxylate superplasticizer into concrete stirring equipment according to the sequence of the hole slag, the cement and the superplasticizer, stirring for 60-80 s, adding stirring water, continuing stirring for 5-8 min, pouring out the mixture after stirring, detecting the performance of the freshly mixed concrete, vibrating and naturally curing to the corresponding age if the design index requirement is met, and obtaining the concrete for underground engineering construction.
High-flow concrete: the concrete with high fluidity can fill the model and wrap the steel bars by means of dead weight, has good workability and filling performance, does not segregate aggregate, has good mechanical property after hardening, and has slump of more than 160mm.
Compared with the prior art, the invention has the advantages that:
1. the concrete for underground engineering construction has high economic and environmental protection benefits for on-site utilization of tunneling hole slag: the granite tunneling hole slag is high in mud content and poor in particle shape, is difficult to directly use for preparing conventional concrete, and is easy to produce environmental pollution due to random discarding; the method takes local materials, directly utilizes the granite tunneling hole slag to prepare the concrete for underground engineering construction, and saves a large amount of fields and transportation cost required by stacking the hole slag.
2. The invention overcomes the influence of poor quality of the tunneling hole slag, and ensures that the fluidity and the strength of the concrete meet the requirements: the anti-mud type polycarboxylate water reducer with better molecular structure is selected, the absorption of clay to the water reducer is reduced, the dosage of the water reducer is properly increased to improve the dispersing effect of the water reducer on cement, and the high-flow-state concrete is obtained under the condition of low water-cement ratio; according to the invention, through cooperation of proper raw materials and proportions, the strength of the concrete 7d is ensured to be more than 25MPa, and the compressive strength of the concrete 28d is ensured to be more than 40MPa.
3. The invention directly takes the granite tunneling hole slag with high mud content as aggregate, and other raw materials of the concrete and the tunneling hole slag have good compatibility, high compressive strength and simple preparation process through simple formula and ingenious design, and can be prepared in situ in narrow environments such as tunnels, galleries and the like.
Drawings
FIG. 1 is a representative topography of granite tunnelling slag in an embodiment of the present invention.
Detailed Description
The invention is further described below in connection with the drawings and the specific preferred embodiments, but the scope of protection of the invention is not limited thereby. The materials and instruments used in the examples below are all commercially available.
In the process of excavating and excavating weathered granite rock bodies by adopting a cantilever type tunneller in a certain underground engineering, a large amount of tunnelling hole slag is generated. According to geological logging information, four granite tunneling hole slag which are close to strong weathering, medium and weak weathering and medium and weak weathering are respectively collected, and the numbers are 1, 2, 3 and 4. The main performance parameters of four granite tunneling hole slag are detected according to the standard of sand and stone quality and inspection method for common concrete JGJ52-2006, the results are shown in table 1, and the typical morphology of the 4# granite tunneling hole slag is shown in figure 1.
TABLE 1 Main performance parameters of tunneling hole slag
| Number of tunneling hole slag | 1 | 2 | 3 | 4 |
| MB value | 11.5 | 10.8 | 9.7 | 9.1 |
| Moisture content (%) | 3.1 | 3.3 | 3.6 | 3.7 |
| Stone ratio (percent) of more than 5mm | 20.5 | 22.8 | 24.4 | 22.4 |
| Maximum crush value of single stage (%) | 76 | 70 | 65 | 60 |
Example 1
The high-flow concrete for pouring the floor of the underground engineering construction is designed to have the strength grade of more than C30, and the slump of the concrete is required to be more than 160mm in the pouring construction. According to the engineering design condition, adopting No. 1 granite tunneling hole slag as aggregate, selecting 0.4 water-cement ratio, adding an anti-mud type polycarboxylate water reducer accounting for 2wt% of the cement consumption, and carrying out a concrete mixture performance test. The concrete (high-flow concrete) for underground engineering construction adopting granite tunneling hole slag as aggregate comprises the following components in parts by mass:
650 parts by mass of ordinary Portland cement
1600 parts by mass of 1# granite tunneling hole slag
13 parts by mass of anti-mud polycarboxylate superplasticizer
260 parts by mass of water.
In the embodiment, the granite tunneling hole slag is a product obtained by directly sieving the tunneling waste slag generated by granite tunneling excavation through a square hole sieve with the nominal diameter of 25mm without washing, and sieving blocks with the diameter of more than 25mm, wherein the moisture content, the blue absorption MB value, the single-stage maximum crushing value and the particle ratio of 5-25 mm of the granite tunneling hole slag are shown in table 1, and the particle sizes are continuously distributed.
In the embodiment, the anti-mud type polycarboxylate superplasticizer is an anti-mud type polycarboxylate superplasticizer meeting the technical requirements of GB/T8076-2008 concrete admixture, and the water reducing rate is 30%.
In the embodiment, the ordinary Portland cement is 42.5-grade ordinary Portland cement meeting the technical requirements of GB175-2020 general Portland Cement, and the specific surface area is 320kg/m 3 The water consumption of the standard consistency is 26 percent, and the compressive strength of the 28d mortar is 49.5MPa.
The preparation method of the concrete for underground engineering construction by adopting granite tunneling hole slag as aggregate comprises the following steps:
sequentially adding the granite tunneling hole slag, the ordinary Portland cement and the anti-mud type polycarboxylate superplasticizer into concrete stirring equipment according to the sequence of the hole slag, the cement and the water reducer, starting the stirring equipment to stir for 60 seconds, adding the stirring water with the mass portions, continuing stirring for 5 minutes, pouring out the concrete after stirring to detect the performance of the freshly mixed concrete, and transporting the concrete tank truck to a construction site to perform concrete pouring construction if the design index requirement is met, and completing vibrating and natural curing to a 28d age period to finish the preparation of the concrete.
The concrete for underground engineering construction of this example is high-flow concrete, and is mainly used for pouring construction of the internal engineering structure of the underground engineering, especially the engineering structure with low durability requirement, and the performance test results are shown in table 2.
Example 2
The engineering situation related to the embodiment is the same as that of the embodiment 1, according to the engineering design situation, 2# granite tunneling hole slag is used as aggregate, a cement-resistant polycarboxylate water reducer with the water-cement ratio of 0.4 and the cement consumption of 2wt% is selected, and a concrete mixture performance test is carried out. The concrete for underground engineering construction adopting granite tunneling hole slag as aggregate comprises the following components in parts by mass:
600 parts by mass of ordinary Portland cement
1650 mass parts of 2# granite tunneling hole slag
12 parts by mass of anti-mud polycarboxylate superplasticizer
240 parts by mass of water.
In the embodiment, the granite tunneling hole slag is a product obtained by directly sieving a square hole sieve with the nominal diameter of 25mm without washing tunneling waste slag generated by granite tunneling excavation, and then sieving blocks with the nominal diameter of more than 25mm, wherein the water content, the blue absorption MB value, the single-stage maximum crushing value and the particle ratio of 5-25 mm particle sizes of the 2# granite tunneling hole slag are shown in table 1, and the particle sizes are continuously distributed.
In the embodiment, the anti-mud type polycarboxylate superplasticizer is an anti-mud type polycarboxylate superplasticizer meeting the technical requirements of GB/T8076-2008 concrete admixture, and the water reducing rate is 30%.
The implementation isIn the example, the Portland cement is 42.5 grade Portland cement meeting the technical requirements of GB175-2020 general Portland Cement, and the specific surface area is 320kg/m 3 The water consumption of the standard consistency is 26 percent, and the compressive strength of the 28d mortar is 49.5MPa.
The preparation process of the concrete for underground engineering construction using granite excavation hole slag as aggregate in this example is the same as that in example 1.
The concrete for underground engineering construction of this example is high-flow concrete, and is mainly used for pouring construction of the internal engineering structure of the underground engineering, especially the engineering structure with low durability requirement, and the performance test results are shown in table 2.
Example 3
The engineering situation related to the embodiment is the same as that of embodiment 1, and according to the engineering design situation, 3# granite tunneling hole slag is used as aggregate, so that a concrete mixture performance test is carried out. The concrete for underground engineering construction adopting granite tunneling hole slag as aggregate comprises the following components in parts by mass:
600 parts by mass of ordinary Portland cement
1650 mass parts of 3# granite tunneling hole slag
12 parts by mass of anti-mud polycarboxylate superplasticizer
240 parts by mass of water.
In the embodiment, the granite tunneling hole slag is a product obtained by directly sieving the tunneling waste slag generated by granite tunneling excavation through a square hole sieve with the nominal diameter of 25mm without washing, and sieving blocks with the diameter of more than 25mm, wherein the water content, the blue absorption MB value, the single-stage maximum crushing value and the particle ratio of 5-25 mm of the 3# granite tunneling hole slag are shown in table 1, and the particle sizes are continuously distributed.
In the embodiment, the anti-mud type polycarboxylate superplasticizer is an anti-mud type polycarboxylate superplasticizer meeting the technical requirements of GB/T8076-2008 concrete admixture, and the water reducing rate is 30%.
In the embodiment, the ordinary Portland cement is 42.5-grade ordinary Portland cement meeting the technical requirements of GB175-2020 general Portland Cement, and the specific surface area is 320kg/m 3 For standard consistenciesThe water content is 26 percent, and the compressive strength of the 28d rubber sand is 49.5MPa.
The preparation process of the concrete for underground engineering construction using granite excavation hole slag as aggregate in this example is the same as that in example 1.
The concrete for underground engineering construction of this example is high-flow concrete, and is mainly used for pouring construction of the internal engineering structure of the underground engineering, especially the engineering structure with low durability requirement, and the performance test results are shown in table 2.
Example 4
The related engineering conditions are the same as those of the example 1, and according to the engineering design conditions, 4# tunneling hole slag is used as aggregate to carry out a concrete mixture performance test. The concrete for underground engineering construction adopting granite tunneling hole slag as aggregate comprises the following components in parts by mass:
550 parts by mass of ordinary Portland cement
1700 parts by mass of 4# granite tunneling hole slag
11 parts by mass of anti-mud polycarboxylate superplasticizer
220 parts of water.
In the embodiment, the granite tunneling hole slag is a product obtained by directly sieving the tunneling waste slag generated by granite tunneling excavation through a square hole sieve with the nominal diameter of 25mm without washing, and sieving blocks with the diameter of more than 25mm, wherein the water content, the blue absorption MB value, the single-stage maximum crushing value and the particle ratio of 5-25 mm of the particle size of the 4# granite tunneling hole slag are shown in table 1, and the particle sizes are continuously distributed.
In the embodiment, the anti-mud type polycarboxylate superplasticizer is an anti-mud type polycarboxylate superplasticizer meeting the technical requirements of GB/T8076-2008 concrete admixture, and the water reducing rate is 30%.
In the embodiment, the ordinary Portland cement is 42.5-grade ordinary Portland cement meeting the technical requirements of GB175-2020 general Portland Cement, and the specific surface area is 320kg/m 3 The water consumption of the standard consistency is 26 percent, and the compressive strength of the 28d mortar is 49.5MPa.
The preparation process of the concrete for underground engineering construction using granite excavation hole slag as aggregate in this example is the same as that in example 1.
The concrete for underground engineering construction of this example is high-flow concrete, and is mainly used for pouring construction of the internal engineering structure of the underground engineering, especially the engineering structure with low durability requirement, and the performance test results are shown in table 2.
Example 5
The related engineering conditions are the same as those of the example 1, and according to the engineering design conditions, 3# tunneling hole slag is used as aggregate to carry out a concrete mixture performance test. The concrete for underground engineering construction adopting granite tunneling hole slag as aggregate comprises the following components in parts by mass:
650 parts by mass of ordinary Portland cement
1600 parts by mass of 3# granite tunneling hole slag
13 parts by mass of anti-mud polycarboxylate superplasticizer
250 parts of water.
In the embodiment, the granite tunneling hole slag is a product obtained by directly sieving the tunneling waste slag generated by granite tunneling excavation through a square hole sieve with the nominal diameter of 25mm without washing, and sieving blocks with the diameter of more than 25mm, wherein the water content, the blue absorption MB value, the single-stage maximum crushing value and the particle ratio of 5-25 mm of the 3# granite tunneling hole slag are shown in table 1, and the particle sizes are continuously distributed.
In the embodiment, the anti-mud type polycarboxylate superplasticizer is an anti-mud type polycarboxylate superplasticizer meeting the technical requirements of GB/T8076-2008 concrete admixture, and the water reducing rate is 30%.
In the embodiment, the ordinary Portland cement is 42.5-grade ordinary Portland cement meeting the technical requirements of GB175-2020 general Portland Cement, and the specific surface area is 320kg/m 3 The water consumption of the standard consistency is 26 percent, and the compressive strength of the 28d mortar is 49.5MPa.
The preparation process of the concrete for underground engineering construction using granite excavation hole slag as aggregate in this example is the same as that in example 1.
The concrete for underground engineering construction of this example is high-flow concrete, and is mainly used for pouring construction of the internal engineering structure of the underground engineering, especially the engineering structure with low durability requirement, and the performance test results are shown in table 2.
Example 6
The related engineering conditions are the same as those of the example 1, and according to the engineering design conditions, 3# tunneling hole slag is used as aggregate to carry out a concrete mixture performance test. The concrete for underground engineering construction adopting granite tunneling hole slag as aggregate comprises the following components in parts by mass:
650 parts by mass of ordinary Portland cement
1600 parts by mass of 3# granite tunneling hole slag
13 parts by mass of anti-mud polycarboxylate superplasticizer
245 parts by mass of water.
In the embodiment, the granite tunneling hole slag is a product obtained by directly sieving the tunneling waste slag generated by granite tunneling excavation through a square hole sieve with the nominal diameter of 25mm without washing, and sieving blocks with the diameter of more than 25mm, wherein the water content, the blue absorption MB value, the single-stage maximum crushing value and the particle ratio of 5-25 mm of the particle size of the 4# granite tunneling hole slag are shown in table 1, and the particle sizes are continuously distributed.
In the embodiment, the anti-mud type polycarboxylate superplasticizer is an anti-mud type polycarboxylate superplasticizer meeting the technical requirements of GB/T8076-2008 concrete admixture, and the water reducing rate is 30%.
In the embodiment, the ordinary Portland cement is 42.5-grade ordinary Portland cement meeting the technical requirements of GB175-2020 general Portland Cement, and the specific surface area is 320kg/m 3 The water consumption of the standard consistency is 26 percent, and the compressive strength of the 28d mortar is 49.5MPa.
The preparation process of the concrete for underground engineering construction using granite excavation hole slag as aggregate in this example is the same as that in example 1.
The concrete for underground engineering construction of this example is high-flow concrete, and is mainly used for pouring construction of the internal engineering structure of the underground engineering, especially the engineering structure with low durability requirement, and the performance test results are shown in table 2.
The slump is detected according to the standard of the common concrete mixture performance test method GB/T50080-2016, the slump loss with time of 1h is detected according to the requirement of the annex A of the concrete quality control standard GB 50164-2011, and the compressive strength of the concrete 7d and 28d is detected according to the standard of the concrete physical and mechanical properties test method GB/T50081-2019. The results of the performance test of the high-flow concrete for underground engineering construction in examples 1 to 6 of the present invention are shown in Table 2.
TABLE 2 Performance test results of high flow concrete for underground construction in examples 1 to 6 and comparative example 1 of the present invention
If the 1# -4# granite tunneling hole slag is used as aggregate, and the conventional technology is adopted to prepare the concrete, the concrete molding and pouring construction are difficult to realize. The construction performance of the concrete is guaranteed by increasing the water consumption, the setting time of the concrete is prolonged to more than 48h from 24h, and the compressive strength is difficult to meet the requirement.
Comparative example 1
And carrying out a concrete mixture performance test by using the 4# granite tunneling hole slag as aggregate. The concrete comprises the following components in parts by mass:
560 parts by mass of ordinary Portland cement
1680 mass parts of 4# granite tunneling hole slag
365 parts by mass of water.
In the comparative example, the granite tunneling hole slag is a product obtained by directly sieving the tunneling waste slag generated by granite tunneling excavation through a square hole sieve with the nominal diameter of 25mm without washing, and then sieving out blocks with the diameter of more than 25mm, wherein the water content, the blue absorption MB value, the single-stage maximum crushing value and the particle ratio of 5 mm-25 mm of the particle size of the 4# granite tunneling hole slag are shown in table 1, and the particle sizes are continuously distributed.
In the comparative example, the Portland cement is 42.5-grade Portland cement meeting the technical requirements of GB175-2020 general Portland Cement, and the specific surface area is 320kg/m 3 The water consumption of the standard consistency is 26 percent, and the compressive strength of the 28d mortar is 49.5MPa.
The concrete for underground engineering construction using granite excavation hole slag as aggregate of this comparative example was prepared in substantially the same manner as in example 1.
The results of the performance test of the concrete for underground construction of this comparative example are shown in Table 2.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. While the invention has been described in terms of preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or equivalent embodiments using the method and technical solution disclosed above without departing from the spirit and technical solution of the present invention. Therefore, any simple modification, equivalent substitution, equivalent variation and modification of the above embodiments according to the technical substance of the present invention, which do not depart from the technical solution of the present invention, still fall within the scope of the technical solution of the present invention.
Claims (7)
1. The concrete for underground engineering construction is characterized by comprising the following components in parts by mass: 550-650 parts of Portland cement, 1600-1700 parts of granite tunneling hole slag, 11-13 parts of anti-mud polycarboxylate superplasticizer and 220-260 parts of water.
2. The concrete for underground engineering construction using granite tunneling hole slag as aggregate according to claim 1, wherein the ordinary Portland cement is 650 parts, the granite tunneling hole slag is 1600 parts, the anti-mud polycarboxylate superplasticizer is 13 parts, and the water is 245-260 parts.
3. The concrete for underground engineering construction using granite excavation hole slag as aggregate according to claim 1, wherein the granite excavation hole slag is a product obtained by directly sieving a block with a nominal diameter of 25mm after a excavation waste slag generated by granite excavation is not washed with water and passes through a square hole sieve with a nominal diameter of more than 25 mm; the water content of the granite tunneling hole slag is 3% -4%, the blue absorption MB value is 9.1-11.5, the single-stage maximum crushing value is 60% -80%, the particles with the particle diameters of 5-25 mm are continuously distributed, the particles with the particle diameters of 5-25 mm account for 20% -25%, and the particles with the particle diameters of less than 5mm account for 75% -80%.
4. The concrete for underground engineering construction using granite driving hole slag as aggregate according to claim 1, wherein the concrete for underground engineering construction is high-flow concrete for pouring construction of an internal engineering structure of underground engineering, and the concrete for underground engineering construction has slump of more than 160mm, 7d compressive strength of more than 25MPa and 28d compressive strength of more than 40MPa.
5. The concrete for underground engineering construction using granite tunneling hole slag as aggregate according to any one of claims 1-4, wherein the anti-mud type polycarboxylate water reducer is an anti-mud type polycarboxylate water reducer meeting the technical requirements of GB/T8076-2008 concrete admixture, and the water reducing rate is 30% -35%.
6. The concrete for underground engineering construction using granite tunneling hole slag as aggregate according to any one of claims 1-4, wherein the Portland cement is Portland cement, the Portland cement is 42.5 grade Portland cement satisfying the technical requirements of GB175-2020 Portland Cement, and the specific surface area is 300kg/m 3 ～350kg/m 3 The water consumption of the standard consistency is 24-28%, and the compressive strength of the 28d rubber sand is more than 48.9MPa.
7. A method for preparing concrete for underground engineering construction using granite excavation hole slag as aggregate according to any one of claims 1 to 6, comprising the steps of:
sequentially adding the granite tunneling hole slag, the silicate cement and the anti-mud type polycarboxylate superplasticizer into concrete stirring equipment according to the sequence of the hole slag, the cement and the superplasticizer, stirring for 60-80 s, adding stirring water, continuing stirring for 5-8 min, pouring out the mixture after stirring, detecting the performance of the freshly mixed concrete, vibrating and naturally curing to the corresponding age if the design index requirement is met, and obtaining the concrete for underground engineering construction.
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