CN-121990798-A - Special concrete for ground terrace and preparation method thereof

Abstract

The invention relates to the technical field of concrete, in particular to special concrete for a ground terrace and a preparation method thereof. The special concrete for the ground floor comprises, by weight, 300-500 kg/m 3 cement, 600-750 kg/m 3 fine aggregate, 900-1200 kg/m 3 coarse aggregate, 15-40kg/m 3 bentonite, 30-60 kg/m 3 high-performance water reducer, 10-30kg/m 3 retarder, 10-20kg/m 3 stabilizer, 300-600 kg/m 3 water, and 10-20kg/m 3 corrosion-resistant reinforcing agent, wherein the retarder is prepared by mixing, by weight, 5-20 parts of expanded perlite, 7-15 parts of sodium lignin sulfonate, 4-8 parts of borax, 2-6 parts of sodium hexametaphosphate and 2-7 parts of tartaric acid. The special concrete for the ground floor prepared by the method has good compression resistance, and also has good durability and collapse resistance.

Inventors

• DENG LIFENG
• DUAN SONGFU
• CHEN HONGJUN
• LIAO LIFENG
• HU HONGWEI

Assignees

• 衢州商品混凝土有限公司

Dates

Publication Date

20260508

Application Date

20260313

Claims (9)

1. 1. The special concrete for the ground floor is characterized by comprising the following raw materials, by weight, 300-500 kg/m 3 cement, 600-750 kg/m 3 fine aggregate, 900-1200 kg/m 3 medium coarse aggregate, 15-40kg/m 3 bentonite, 30-60 kg/m 3 high-performance water reducer, 10-30kg/m 3 retarder, 10-20kg/m 3 stabilizer, 300-600 kg/m 3 water and 10-20kg/m 3 corrosion-resistant reinforcing agent; The retarder is prepared by mixing the following raw materials, by weight, 5-20 parts of expanded perlite, 7-15 parts of sodium lignin sulfonate, 4-8 parts of borax, 2-6 parts of sodium hexametaphosphate and 2-7 parts of tartaric acid.
2. 2. The concrete special for the ground floor according to claim 1, wherein the water reducer is at least one of a polycarboxylate water reducer, a naphthalene water reducer and a sulfonate water reducer.
3. 3. The special concrete for the ground floor according to claim 1, wherein the stabilizer is at least one of potassium methyl silicate, guar gum, polyacrylamide and cocamidopropyl betaine.
4. 4. The special concrete for the ground floor according to claim 1, wherein the preparation method of the corrosion-resistant reinforcing agent comprises the following steps of S1, immersing carbon fibers in concentrated nitric acid for activation to obtain activated carbon fibers, dispersing the activated carbon fibers in an ethanol water solution, adjusting the pH value to be acidic, and adding a silane coupling agent for reaction to obtain double-bond modified carbon fibers; S2, mixing itaconic acid, acrylic acid and water in an inert atmosphere, adjusting the pH to be acidic, and adding an acrylamide derivative, double bond modified carbon fiber, hydroxyethyl acrylate and an initiator for copolymerization reaction to obtain a carbon fiber reinforced material; S3, dissolving the epoxy resin and the carbon fiber reinforced material in a solvent, and adding an amine cross-linking agent for reaction to prepare the corrosion-resistant reinforcing agent.
5. 5. The special concrete for the ground floor according to claim 4, wherein the silane coupling agent is any one of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyl triethoxysilane, KH-550 and methacryloyloxymethyl trimethoxysilane.
6. 6. The special concrete for the ground floor according to claim 4, wherein the weight part ratio of itaconic acid, acrylic acid, acrylamide derivatives, double bond modified carbon fibers and hydroxyethyl acrylate in the S2 is (2-5): (1-2): (3-7): (8-12): (0.5-2), and the copolymerization reaction condition is that the reaction is carried out for 1.5-4 hours at 70-90 ℃ and 300-600 rpm.
7. 7. The special concrete for the ground floor according to claim 4, wherein the acrylamide derivative is at least one of 2-acrylamido-2-methylpropanesulfonic acid, N-methylolacrylamide and N, N' -methylenebisacrylamide.
8. 8. The special concrete for the ground floor according to claim 4, wherein the amine cross-linking agent in the S3 is any one of diethylenetriamine and triethylenetetramine.
9. 9. A method for preparing the concrete special for the ground terrace according to any one of claims 1 to 8, comprising the following steps: (1) Weighing the raw materials according to parts by weight; (2) Mixing cement, fine aggregate, medium and coarse aggregate and bentonite, adding water, and uniformly stirring at 300rpm to obtain a premix; (3) And then adding the high-performance water reducer, the retarder and the stabilizer into the premix, and continuously stirring uniformly to obtain the special concrete for the ground floor.

Description

Special concrete for ground terrace and preparation method thereof Technical Field The invention relates to the technical field of concrete, in particular to special concrete for a ground terrace and a preparation method thereof. Background With the increasing requirements of the construction industry on the quality of ground engineering, the performance short plates of the terrace materials are increasingly prominent. At present, although the technology of the terrace with epoxy self-leveling, carborundum wear-resistant and the like can provide attractive surface effects, the inherent defects limit the application of the technology, namely, the surface layer has poor scratch resistance, quality problems such as delamination, hollowing, cracking, fading and the like are easy to occur, the whole service life is shorter, the later maintenance cost is high, and the long-acting and durable requirements of industrial and commercial buildings on the terrace are difficult to meet. From the structural aspect, the performance of the traditional reinforced concrete ground is seriously dependent on foundation treatment and construction quality control. If the land survey is inaccurate, the backfill compaction degree is insufficient or the construction defect exists, the overall cracking, collapse and deformation of the ground are extremely easy to be caused under the actions of groundwater fluctuation, uneven settlement and dynamic load, and obvious safety risks and economic losses are brought. Therefore, the improvement of the mechanical property and durability of the terrace concrete body is a key for enhancing the reliability of the ground system from the source. At the material level, traditional floor concrete is faced with inherent contradictions between workability, strength and durability for a long time. The high water cement ratio formula adopted for realizing high fluidity can obviously reduce the final compressive strength of concrete, exacerbate the tendency of segregation, bleeding and plastic shrinkage cracking, and directly impair the construction quality and the terrace flatness. Although the performance can be improved to a certain extent by adding the water reducer and the fiber, the interface bonding between the conventional fiber and the cement matrix is weak, the conventional fiber is easy to deteriorate in a corrosive environment, and the flow stability, the long-term durability and the high strength cannot be simultaneously achieved. Therefore, there is a need in the industry for a concrete special for floors that can cooperatively solve the contradiction of high fluidity, high stability, high strength and high durability by material innovation, so as to cope with increasingly severe engineering application environments. Disclosure of Invention Aiming at the defects in the prior art, the invention provides special concrete for a ground terrace and a preparation method thereof. In order to solve the technical problems, the invention adopts the following technical scheme: The special concrete for the ground floor consists of the following raw materials, by weight, 300-500 kg/m 3 cement, 600-750 kg/m 3 fine aggregate, 900-1200 kg/m 3 coarse aggregate, 15-40kg/m 3 bentonite, 30-60 kg/m 3 high-performance water reducer, 10-30kg/m 3 retarder, 10-20kg/m 3 stabilizer, 300-600 kg/m 3 water, and 10-20kg/m 3 corrosion-resistant reinforcing agent; The retarder is prepared by mixing the following raw materials, by weight, 5-20 parts of expanded perlite, 7-15 parts of sodium lignin sulfonate, 4-8 parts of borax, 2-6 parts of sodium hexametaphosphate and 2-7 parts of tartaric acid. In the retarder of the present invention, expanded perlite improves fluidity as a lightweight micro aggregate and stabilizes slurry by adsorbing moisture and providing nucleation sites, promoting densification. Tartaric acid is used as a powerful retarder and is strongly complexed with calcium ions to effectively inhibit early hydration and smooth hydration heat, borax provides a medium retarding effect, and sodium lignin sulfonate plays a core dispersing effect by virtue of the anionic surface activity of sodium lignin sulfonate to release free water at the same time of retarding. The three are cooperated, so that the concrete can keep plasticity for a long time during construction, and the collapse resistance is improved. The sodium hexametaphosphate is used as a high-efficiency dispersing agent, generates a strong synergistic dispersion effect with sodium lignin sulfonate, further ensures uniform suspension of cement, bentonite and the like through electrostatic repulsive force and steric hindrance, and prevents flocculation and sedimentation, which is the key of maintaining no segregation and no bleeding under a high flow state. The corrosion-resistant reinforcing agent is added by hybridization of organic and inorganic materials through chemical grafting and crosslinking. The fiber network of weak three-dimensional polymer can