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CN-121990796-A - Anti-abrasion solid waste-based concrete for canal lock gallery and preparation method thereof

CN121990796ACN 121990796 ACN121990796 ACN 121990796ACN-121990796-A

Abstract

The invention discloses a canal lock gallery anti-abrasion solid waste-based concrete and a preparation method thereof, which relate to the field of hydraulic building materials, the hydration temperature rise and the cracking risk are reduced, the regenerated steel fibers and the nano silicon dioxide are added, the three-dimensional support network is constructed, the pores are optimized and the interface is bonded, the densification of the concrete microstructure is achieved, the anti-abrasion capability is improved, the solid waste recycling is achieved, and the method has environmental benefits and engineering values.

Inventors

  • XIAO JIANZHUANG
  • YANG MINGJIAN
  • WANG JIEYUN
  • LUO DANNI
  • LIU HAORAN
  • YANG HAIFENG
  • LI WENMING

Assignees

  • 广西大学

Dates

Publication Date
20260508
Application Date
20260205

Claims (10)

  1. 1. The anti-abrasion solid waste-based concrete for the canal lock gallery is characterized by comprising, by weight, 180-250 parts of cement, 1050-1200 parts of recycled coarse aggregate, 700-800 parts of recycled sand, 70-85 parts of fly ash, 90-120 parts of slag powder, 30-50 parts of recycled micro powder, 80-100 parts of recycled steel fibers, 3-5 parts of nano silicon dioxide, 150-170 parts of water and 2-3 parts of water reducer; The recycled coarse aggregate, the recycled sand and the recycled micro powder are all prepared from building solid waste, the slag powder is prepared from industrial solid waste, and the recycled steel fiber is prepared from steel wires in waste tires.
  2. 2. The canal lock corridor abrasion resistant solid waste-based concrete of claim 1, wherein the cement is a moderate heat portland cement of grade p.o42.5 and above.
  3. 3. The canal lock gallery anti-abrasion solid waste-based concrete according to claim 2, wherein the particle size of the recycled coarse aggregate is 5-26.5 mm, the crushing value is not more than 18.1%, the water absorption rate for 24h is not more than 4.25%, the recycled coarse aggregate meets the continuous grading requirement of 5-25 mm and meets the specification requirement of GB/T25177-2010, and the particle size of the recycled micro powder is not more than 100 μm.
  4. 4. The canal lock gallery abrasion resistant solid waste-based concrete according to claim 3, wherein the particle size of the reclaimed sand is 0.16-2.36 mm, and meets the specification requirements of GB/T14684-2022.
  5. 5. The canal lock gallery abrasion resistant solid waste-based concrete of claim 4, wherein said fly ash is class F class I fly ash with a water demand ratio of no more than 95%.
  6. 6. The canal lock gallery abrasion resistant solid waste-based concrete of claim 5, wherein said slag powder is S95 grade slag powder, the activity index is not less than 95% for 28 days, and the specific surface area is not less than 400m 2 /kg.
  7. 7. The canal lock gallery abrasion resistant solid waste-based concrete of claim 6, wherein the length of the recycled steel fiber is 30-50 mm and the diameter is 0.3-0.9 mm.
  8. 8. The canal lock gallery abrasion resistant solid waste-based concrete according to claim 7, wherein the nano silicon dioxide has a particle size of 20-25 nm, a purity of not less than 99.5%, a specific surface area of not less than 640m 2 /g, and a ph of 6-8.
  9. 9. The canal lock gallery abrasion resistant solid waste-based concrete of claim 8, wherein the water reducing agent is a polycarboxylic acid type high performance water reducing agent with a water reducing rate of not less than 30%.
  10. 10. A method for preparing the canal lock gallery abrasion-resistant solid waste-based concrete according to any one of claims 1 to 9, which is characterized by comprising the following steps: s1, putting nano silicon dioxide into 1/4 of the total water, and performing ultrasonic dispersion for 15min at the power of 300W and the temperature of 25 ℃ to obtain stable nano modified liquid; S2, cleaning and screening the recycled coarse aggregate and the recycled sand, pre-wetting the recycled coarse aggregate and the recycled sand to a saturated surface dry state to complete pretreatment, putting the pretreated recycled coarse aggregate and the pretreated recycled sand into a stirrer, and dry-stirring at the rotating speed of 300r/min for 2min, and then adding cement, fly ash, slag powder and recycled micro powder, and continuously stirring at the rotating speed of 350r/min for 3min to obtain a uniform dry material system; S3, mixing the polycarboxylic acid high-performance water reducer with 3/4 total water to obtain a water reducer solution, adding 70% of the water reducer solution into a dry material system, stirring for 3min at 500r/min, adding the rest water reducer solution and nano modified liquid, stirring for 2min at 350r/min, adding the regenerated steel fiber at a low speed after the slurry is fluidized, and stirring for 300r/min until no agglomeration is caused to obtain a mixture; S4, pouring the mixture within 30min, vibrating at high frequency for compaction, covering and moisturizing for 12h, and curing by a conventional curing system until the design age is reached.

Description

Anti-abrasion solid waste-based concrete for canal lock gallery and preparation method thereof Technical Field The invention relates to the field of hydraulic building materials, in particular to anti-abrasion solid waste-based concrete for canal lock galleries and a preparation method thereof. Background In recent years, the whole building industry in China enters a high-quality development stage, but the new building scale still keeps high, and the continuous and large consumption of natural sand and stone resources is accompanied with the new building scale. Natural sand and stone is used as a core raw material for preparing concrete, belongs to non-renewable resources, causes a series of ecological environment problems after long-term excessive exploitation, and has a particularly prominent resource shortage situation in coastal and engineering concentrated areas. Meanwhile, the new building construction and the solid waste of the building generated in the existing building dismantling process have huge quantity and gradually increase year by year, and the new building construction and the solid waste of the building generated in the existing building dismantling process are taken as main components in a global solid waste system, and the standardized recovery and the high-value utilization of the new building construction and the solid waste of the building are key problems of urgent breakthrough in the sustainable development of the industry. Under the promotion of six canal projects of national planning construction, the canal project construction of China is in an coming high-strength development period, and taking an inland canal as an example, the concrete pouring quantity of the main body of the three-large hub ship lock is 584 ten thousand m 3, so that the concrete demand is extremely large for perfecting a canal water system shipping network. The ship lock gallery is used as a core hydraulic structure of shipping engineering, bears the key function of water body transportation when a ship passes the ship, always bears the continuous flushing and grinding action of high-speed water to carry sediment in the running process, gradually erodes the concrete surface layer by the flushing and grinding action, and damages the structural integrity and the functional efficiency of key infrastructure, so that the surface is gradually degraded, cracks are generated, and the problems of shortened service life, increased maintenance cost and the like are caused. At present, the requirement of the important engineering on high-performance anti-abrasion concrete is urgent, but the actual dilemma of lack of natural sand resources becomes an important bottleneck for restricting the quality improvement and efficiency improvement of engineering construction. The solid waste-based concrete is a heterogeneous material prepared by taking various solid wastes as core raw materials, partially or completely replacing traditional concrete components such as cement, natural sand stone and the like, and matching cement, water and additives. The traditional solid waste-based concrete anti-impact grinding technology is mostly limited to single component optimization, such as simply improving the strength of recycled aggregate or increasing the consumption of cementing materials, but neglecting the core value of multiphase cooperative reinforcement and solid waste suitability, and the yield of the solid waste of the building is greatly increased under the background of basic construction quality improvement and urban updating, and the recycled coarse aggregate, recycled sand and recycled micro powder gradient products can be formed after sorting, crushing and grading treatment, so that the requirements of concrete coarse aggregate frameworks, fine aggregate graded filling and cementing admixture can be respectively adapted, a full-graded solid waste-based system is constructed, and the concrete anti-impact grinding foundation is tamped from the multi-phase matrix level. In the prior art, aiming at the severe working condition of high-speed sand-carrying and grinding of a canal water gallery, the related research and engineering application cases of the canal lock gallery grinding-resistant solid waste-based concrete adapting to the working condition are developed by taking the recycling of building solid waste as a core and combining the multiphase collaborative design thought of industrial solid waste compounding, nano modification and fiber reinforcement. In the prior art, in order to cope with the requirements of abrasion resistance, low heat and recycling of ship lock gallery concrete, a plurality of technical paths are presented, but the technical paths are often focused on solving a single problem, and the cooperation of performance, environmental protection and temperature control is not realized. For example, the patent publication CN119061859a/B uses ultra-high performance concrete (UHPC) to prepare prefabricated pane