Ultra-high strength and toughness high-performance concrete and preparation method thereof

Abstract

The invention belongs to the technical field of concrete and provides an ultra-high strength and toughness high-performance concrete and a preparation method thereof. The raw materials include, by mass, 500-600 parts of cement, 40-60 parts of mineral powder, 90-110 parts of microspheres, 40-60 parts of silica fume, 490-500 parts of zone II medium sand, 340-355 parts of 5-10 mm crushed stone, 800-815 parts of 10-20 mm crushed stone, 20-30 parts of admixture, 40-50 parts of fiber, 110-120 parts of water; 5-6 parts of densifier; 8-15 parts of polycarboxylate water reducer; and 10-25 parts of epoxy resin. The admixture includes N-n-butyl-N-methylethanolamine and triethanolamine dodecylbenzenesulfonate in a mass ratio of 1:0.4-0.6. The present invention improves the density and toughness of concrete by improving the concrete formula, and at the same time enables the concrete to meet the C120 compressive strength requirement and also improves its flexural strength.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete and relates to ultra-high strength and toughness high performance concrete and a preparation method thereof. Background Art

[0002] In structural design, considering the functional requirements, component stiffness, and ease of construction, different grades of concrete are usually used for different stress conditions to meet the required compressive, flexural, and splitting tensile strengths when the component is loaded, as well as to ensure the bond strength required for the synergistic work between concrete and steel. Concrete materials of different grades have different elastic moduli and deformation properties. Therefore, if the strength index is too large or too small, it will cause the deformation of steel and concrete to be inconsistent when the component is loaded. As a result, the two materials cannot fully work together or one material cannot fully exert its mechanical properties, resulting in material waste. In today's reinforced concrete structures, high-strength concrete C60-C100 has been widely used, and in super-high-rise buildings and long-span bridge structures, there is an increasing demand for ultra-high-strength concrete with strength grades of C100 and above.

[0003] The current ultra-high-strength concrete production technology achieves ultra-high strength by using high-strength cement, high-strength aggregate, and adjusting the water-binder ratio. However, it only focuses on achieving its compressive strength without improving its flexural strength. Its flexural strength is still about 10% of its compressive strength, which cannot meet the special requirements of bridges and large-span engineering projects with special flexural performance. Summary of the Invention

[0004] The present invention provides ultra-high strength and toughness high performance concrete and a preparation method thereof, which solves the problem of low flexural strength of concrete in the prior art.

[0005] The technical solution of the present invention is achieved as follows:

[0006] An ultra-high strength and toughness high performance concrete, characterized in that, calculated by weight, the raw materials include:

[0007] 500-600 parts of cement,

[0008] 40-60 parts of mineral powder,

[0009] 90-110 parts micro beads,

[0010] 40-60 parts of silica fume,

[0011] 490-500 parts of medium sand in zone II,

[0012] 340-355 parts of 5-10mm gravel,

[0013] 800-815 parts of 10-20mm gravel,

[0014] 20-30 parts of admixture,

[0015] 40-50 servings of fiber,

[0016] 110-120 parts water;

[0017] 5-6 parts of densifier;

[0018] 8-15 parts of polycarboxylate water reducer;

[0019] 10-25 parts of epoxy resin;

[0020] The admixture comprises N-n-butyl-N-methylethanolamine and triethanolamine dodecylbenzenesulfonate in a mass ratio of 1:0.4-0.6.

[0021] Furthermore, the epoxy resin is E42 epoxy resin.

[0022] Furthermore, the polycarboxylate water reducer is polycarboxylate TDHKI.

[0023] Furthermore, the fibers include copper-plated steel fibers and carbon fibers in a mass ratio of 25-30:5-10.

[0024] Furthermore, the carbon fiber is a small carbon fiber tow T700; the copper-plated steel fiber has a nominal diameter of 0.75 mm, an aspect ratio of 0.8, and a tensile strength of >1,000 MPa.

[0025] Furthermore, the densifier is F-511B waterproof densifier.

[0026] Furthermore, the cement is P·O52.5 grade Portland cement, and the mineral powder is S105 grade mineral powder.

[0027] Furthermore, the 28d activity index of the microbeads is 115%.

[0028] Furthermore, the SiO2 content of the silica fume is 92%.

[0029] The method for preparing the ultra-high strength and toughness high performance concrete comprises the following steps:

[0030] A. Mix the medium sand in Zone II, 5-10mm crushed stone, 10-20mm crushed stone, cement, silica fume, mineral powder, and microbeads to obtain premix a. This step is to ensure that the aggregate and powder are fully mixed;

[0031] B. Weigh water, densifier, polycarboxylate water reducer and admixture according to the formula;

[0032] Divide the weighed water into two parts, add a densifier and a polycarboxylate water-reducing agent to one part, mix and stir, and then add it to the premix a to obtain a premix b1;

[0033] Another portion of water is added to the admixture, mixed and stirred, and then added to the premix b1 to obtain premix b2; the two portions of water are for fully blending the additives, the first step of stirring is for the densifier to react preliminarily with the concrete, and the second step of stirring is for the admixture to fully react with the concrete to exert its effect.

[0034] C. Add the fibers to premix b2, mix and stir to obtain premix c. This step is to ensure that the fibers are evenly distributed in the concrete.

[0035] D. Add epoxy resin to premix c, mix and stir, and obtain ultra-high-strength and high-performance concrete. This step allows the epoxy resin to be mixed into the concrete, improving the bonding strength between the concrete and the fibers, and increasing the strength and toughness of the concrete.

[0036] Furthermore, the stirring rate is 40-55 r / min, and the stirring time is 30-50 s.

[0037] The working principle and beneficial effects of the present invention are:

[0038] 1. The present invention improves the compactness of concrete by improving the concrete formula, and at the same time, enables the concrete to meet the C120 compressive strength requirements while also improving its flexural strength and toughness. Triethanolamine dodecylbenzenesulfonate acts as a dispersant, improving the dispersion of fibers, cement, and microbeads, resulting in more uniform material distribution and a more complete reaction. N-n-butyl-N-methylethanolamine and triethanolamine dodecylbenzenesulfonate synergistically promote the stability of the ettringite structure and enhance concrete strength. F-511B and polycarboxylic acid water reducers enhance the compactness and strength of concrete. Epoxy resin enhances the physical structure of hydrated cement and increases the toughness of concrete.

[0039] 2. The present invention improves the compactness of concrete by adding a densifier, and then improves the toughness of concrete by adding high-toughness fibers (copper-plated steel fibers, carbon fibers), and improves the flexural strength, so that the concrete can meet the C120 compressive strength requirements while also improving its flexural strength. Generally, the flexural strength of concrete is about 10% of the compressive strength. The present invention can make the flexural strength of concrete reach about 15% of the compressive strength, reaching 20Mpa. DETAILED DESCRIPTION

[0040] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0041] The materials used in the following examples and comparative examples can all be purchased from commercial sources.

[0042] The carbon fiber is carbon fiber small tow T700;

[0043] The nominal diameter of the copper-coated steel fiber is 0.75 mm, the aspect ratio is 0.8, and the tensile strength is >1 000 MPa;

[0044] The densifier is F-511B waterproof densifier;

[0045] The cement is P·O52.5 grade Portland cement;

[0046] The mineral powder is S105 grade mineral powder;

[0047] The microbeads had a 28-day activity index of 115% and were purchased from Shenzhen Wenjingdaote New Materials Technology Investment Co., Ltd.

[0048] The SiO2 content of silica fume is 92%;

[0049] Epoxy resin was purchased from Laizhou Baichen Insulation Material Co., Ltd. as E42 epoxy resin;

[0050] The polycarboxylate water reducer was purchased from Polycarboxylate TDHKI of Tuoda (Shandong) New Materials Technology Industry Group Co., Ltd.

[0051] Example 1

[0052] An ultra-high strength and toughness high performance concrete, the raw materials of which, calculated by weight, include:

[0053] 500 parts cement,

[0054] 60 parts mineral powder,

[0055] 90 microbeads,

[0056] 60 parts of silica fume,

[0057] 490 parts of medium sand in Zone II,

[0058] 355 parts of 5-10mm gravel,

[0059] 800 parts of 10-20mm gravel,

[0060] 30 parts admixture,

[0061] 40 parts of fibers, the fibers comprising copper-coated steel fibers and carbon fibers in a mass ratio of 30:5;

[0062] 120 parts water;

[0063] 5 parts of densifier;

[0064] 15 parts of polycarboxylate water reducer;

[0065] 10 parts epoxy resin;

[0066] The admixture comprises N-n-butyl-N-methylethanolamine and triethanolamine dodecylbenzenesulfonate in a mass ratio of 1:0.6.

[0067] The method for preparing the ultra-high strength and toughness high performance concrete comprises the following steps:

[0068] A. Mix the medium sand in zone II, 5-10 mm crushed stone, 10-20 mm crushed stone, cement, silica fume, mineral powder, and microbeads at a rate of 48 r / min for 30 seconds to obtain premix a;

[0069] B. Weigh water, densifier, polycarboxylate water reducer and admixture according to the formula;

[0070] The weighed water was divided into two parts, one of which was added with a densifier and a polycarboxylate water-reducing agent, mixed and stirred at a rate of 48 r / min for 30 s, and then added to the premix a to obtain a premix b1;

[0071] Another portion of water was added with the admixture, mixed and stirred at a rate of 48 r / min for 30 s, and then added to the premix b1 to obtain premix b2;

[0072] C. Add the fiber to premix b2 and mix and stir at a rate of 48 r / min for 50 s to obtain premix c;

[0073] D. Add epoxy resin to premix c, mix and stir at a rate of 48 r / min for 30 s to obtain ultra-high strength and toughness high performance concrete.

[0074] After mixing, concrete was cast into 150mm*150mm*150mm standard compression test blocks, 150mm*150mm*550mm standard flexural test blocks, and 150mm*150mm*150mm standard tensile test blocks. After demolding, they were placed in a standard curing room for curing. Tests were carried out at the corresponding ages. The mechanical properties of the above examples and comparative examples were tested according to GB50081-2019. The results are as follows:

[0075]

[0076] Example 2

[0077] An ultra-high strength and toughness high performance concrete, the raw materials of which, calculated by weight, include:

[0078] 600 parts of cement,

[0079] 40 parts of mineral powder,

[0080] 110 parts micro beads,

[0081] 40 parts of silica fume,

[0082] 500 parts of medium sand in Zone II,

[0083] 340 parts of 5-10mm gravel,

[0084] 815 parts of 10-20mm gravel,

[0085] 20 parts admixture,

[0086] 50 parts of fibers, the fibers comprising copper-coated steel fibers and carbon fibers in a mass ratio of 25:10;

[0087] 110 parts water;

[0088] 6 parts of densifier;

[0089] 8 parts of polycarboxylate water reducer;

[0090] 25 parts epoxy resin;

[0091] The admixture comprises N-n-butyl-N-methylethanolamine and triethanolamine dodecylbenzenesulfonate in a mass ratio of 1:0.4.

[0092] The method for preparing the ultra-high strength and toughness high performance concrete comprises the following steps:

[0093] A. Mix the medium sand in zone II, 5-10 mm crushed stone, 10-20 mm crushed stone, cement, silica fume, mineral powder, and microbeads at a rate of 48 r / min for 30 seconds to obtain premix a;

[0094] B. Weigh water, densifier, polycarboxylate water reducer and admixture according to the formula;

[0095] The weighed water was divided into two parts, one of which was added with a densifier and a polycarboxylate water-reducing agent, mixed and stirred at a rate of 48 r / min for 30 s, and then added to the premix a to obtain a premix b1;

[0096] Another portion of water was added with the admixture, mixed and stirred at a rate of 48 r / min for 30 s, and then added to the premix b1 to obtain premix b2;

[0097] C. Add the fiber to premix b2 and mix and stir at a rate of 48 r / min for 50 s to obtain premix c;

[0098] D. Add epoxy resin to premix c, mix and stir at a rate of 48 r / min for 30 s to obtain ultra-high strength and toughness high performance concrete.

[0099] After mixing, concrete was cast into 150mm*150mm*150mm standard compression test blocks, 150mm*150mm*550mm standard flexural test blocks, and 150mm*150mm*150mm standard tensile test blocks. After demolding, they were placed in a standard curing room for curing. Tests were carried out at the corresponding ages. The mechanical properties of the above examples and comparative examples were tested according to GB50081-2019. The results are as follows:

[0100]

[0101]

[0102] Example 3

[0103] An ultra-high strength and toughness high performance concrete, the raw materials of which, calculated by weight, include:

[0104] 550 parts of cement,

[0105] 50 parts of mineral powder,

[0106] 100 parts micro beads,

[0107] 50 parts of silica fume,

[0108] 495 parts of medium sand in Zone II,

[0109] 347 parts of 5-10mm gravel,

[0110] 809 parts of 10-20mm gravel,

[0111] 26 parts admixture,

[0112] 45 parts of fibers, the fibers comprising copper-coated steel fibers and carbon fibers in a mass ratio of 28:8;

[0113] 115 parts water;

[0114] 5.5 parts of densifier;

[0115] 10 parts of polycarboxylate water reducer;

[0116] 20 parts epoxy resin;

[0117] The admixture comprises N-n-butyl-N-methylethanolamine and triethanolamine dodecylbenzenesulfonate in a mass ratio of 1:0.5.

[0118] The method for preparing the ultra-high strength and toughness high performance concrete comprises the following steps:

[0119] A. Mix the medium sand in zone II, 5-10 mm crushed stone, 10-20 mm crushed stone, cement, silica fume, mineral powder, and microbeads at a rate of 48 r / min for 30 seconds to obtain premix a;

[0120] B. Weigh water, densifier, polycarboxylate water reducer and admixture according to the formula;

[0121] The weighed water was divided into two parts, one of which was added with a densifier and a polycarboxylate water-reducing agent, mixed and stirred at a rate of 48 r / min for 30 s, and then added to the premix a to obtain a premix b1;

[0122] Another portion of water was added with the admixture, mixed and stirred at a rate of 48 r / min for 30 s, and then added to the premix b1 to obtain premix b2;

[0123] C. Add the fiber to premix b2 and mix and stir at a rate of 48 r / min for 50 s to obtain premix c;

[0124] D. Add epoxy resin to premix c, mix and stir at a rate of 48 r / min for 30 s to obtain ultra-high strength and toughness high performance concrete.

[0125] After mixing, concrete was cast into 150mm*150mm*150mm standard compression test blocks, 150mm*150mm*550mm standard flexural test blocks, and 150mm*150mm*150mm standard tensile test blocks. After demolding, they were placed in a standard curing room for curing. Tests were carried out at the corresponding ages. The mechanical properties of the above examples and comparative examples were tested according to GB50081-2019. The results are as follows:

[0126]

[0127] Example 4

[0128] An ultra-high strength and toughness high performance concrete, the raw materials of which, calculated by weight, include:

[0129] 580 parts of cement,

[0130] 40 parts of mineral powder,

[0131] 100 parts micro beads,

[0132] 45 parts of silica fume,

[0133] 500 parts of medium sand in Zone II,

[0134] 350 parts of 5-10mm gravel,

[0135] 810 parts of 10-20mm gravel,

[0136] 25 parts admixture,

[0137] 40 parts of fibers, the fibers comprising copper-coated steel fibers and carbon fibers in a mass ratio of 30:10;

[0138] 110 parts water;

[0139] 6 parts of densifier;

[0140] 12 parts of polycarboxylate water reducer;

[0141] 15 parts epoxy resin;

[0142] The admixture comprises N-n-butyl-N-methylethanolamine and triethanolamine dodecylbenzenesulfonate in a mass ratio of 1:0.5.

[0143] The method for preparing the ultra-high strength and toughness high performance concrete comprises the following steps:

[0144] A. Mix the medium sand in zone II, 5-10 mm crushed stone, 10-20 mm crushed stone, cement, silica fume, mineral powder, and microbeads at a rate of 50 r / min for 40 seconds to obtain premix a;

[0145] B. Weigh water, densifier, polycarboxylate water reducer and admixture according to the formula;

[0146] The weighed water was divided into two parts, one of which was added with a densifier and a polycarboxylate water-reducing agent, mixed and stirred at a rate of 50 r / min for 30 s, and then added to the premix a to obtain a premix b1;

[0147] Another portion of water was added with the admixture, mixed and stirred at a rate of 40 r / min for 30 s, and then added to the premix b1 to obtain premix b2;

[0148] C. Add the fiber to premix b2 and mix and stir at a rate of 50 r / min for 50 s to obtain premix c;

[0149] D. Add epoxy resin to premix c, mix and stir at a rate of 50 r / min for 50 s to obtain ultra-high strength and toughness high performance concrete.

[0150] After mixing, concrete was cast into 150mm*150mm*150mm standard compression test blocks, 150mm*150mm*550mm standard flexural test blocks, and 150mm*150mm*150mm standard tensile test blocks. After demolding, they were placed in a standard curing room for curing. Tests were carried out at the corresponding ages. The mechanical properties of the above examples and comparative examples were tested according to GB50081-2019. The results are as follows:

[0151]

[0152] Example 5

[0153] An ultra-high strength and toughness high performance concrete, the raw materials of which, calculated by weight, include:

[0154] 500 parts of cement,

[0155] 40 parts of mineral powder,

[0156] 110 parts micro beads,

[0157] 60 parts of silica fume,

[0158] 490 parts of medium sand in Zone II,

[0159] 340 parts of 5-10mm gravel,

[0160] 810 parts of 10-20mm gravel,

[0161] 20 = parts of admixture,

[0162] 50 parts of fibers, the fibers comprising copper-coated steel fibers and carbon fibers in a mass ratio of 25:5;

[0163] 120 parts water;

[0164] 6 parts of densifier;

[0165] 9 parts of polycarboxylate water reducer;

[0166] 22 parts epoxy resin;

[0167] The admixture comprises N-n-butyl-N-methylethanolamine and triethanolamine dodecylbenzenesulfonate in a mass ratio of 1:0.4.

[0168] The method for preparing the ultra-high strength and toughness high performance concrete comprises the following steps:

[0169] A. Mix the medium sand in zone II, 5-10 mm crushed stone, 10-20 mm crushed stone, cement, silica fume, mineral powder, and microbeads at a rate of 40 r / min for 50 s to obtain premix a;

[0170] B. Weigh water, densifier, polycarboxylate water reducer and admixture according to the formula;

[0171] The weighed water was divided into two parts, one of which was added with a densifier and a polycarboxylate water-reducing agent, mixed and stirred at a rate of 55 r / min for 50 s, and then added to the premix a to obtain a premix b1;

[0172] Another portion of water was added to the admixture, mixed and stirred at a rate of 40 r / min for 50 s, and then added to the premix b1 to obtain premix b2;

[0173] C. Add the fiber to premix b2 and mix and stir at a rate of 55 r / min for 30 s to obtain premix c;

[0174] D. Add epoxy resin to premix c, mix and stir at a rate of 40 r / min for 50 s to obtain ultra-high strength and toughness high performance concrete.

[0175] After mixing, concrete was cast into 150mm*150mm*150mm standard compression test blocks, 150mm*150mm*550mm standard flexural test blocks, and 150mm*150mm*150mm standard tensile test blocks. After demolding, they were placed in a standard curing room for curing. Tests were carried out at the corresponding ages. The mechanical properties of the above examples and comparative examples were tested according to GB50081-2019. The results are as follows:

[0176]

[0177] Comparative Example 1

[0178] An ultra-high strength and toughness high performance concrete, the raw materials of which, calculated by weight, include:

[0179] 550 parts of cement,

[0180] 50 parts of mineral powder,

[0181] 100 parts micro beads,

[0182] 50 parts of silica fume,

[0183] 495 parts of medium sand in Zone II,

[0184] 347 parts of 5-10mm gravel,

[0185] 809 parts of 10-20mm gravel,

[0186] 45 parts of fibers, the fibers comprising copper-coated steel fibers and carbon fibers in a mass ratio of 28:8;

[0187] 115 parts water;

[0188] 5.5 parts of densifier;

[0189] 10 parts of polycarboxylate water reducer;

[0190] 20 parts epoxy resin;

[0191] The method for preparing the ultra-high strength and toughness high performance concrete comprises the following steps:

[0192] A. Mix the medium sand in zone II, 5-10 mm crushed stone, 10-20 mm crushed stone, cement, silica fume, mineral powder, and microbeads at a rate of 48 r / min for 30 seconds to obtain premix a;

[0193] B. Weigh water, densifier and polycarboxylate water reducer according to the formula;

[0194] The weighed water was divided into two parts, one of which was added with a densifier and a polycarboxylate water-reducing agent, mixed and stirred at a rate of 48 r / min for 30 s, and then added to the premix a to obtain a premix b1;

[0195] C. Add the fiber to premix b1 and mix and stir at a rate of 48 r / min for 50 s to obtain premix c;

[0196] D. Add epoxy resin to premix c, mix and stir at a rate of 48 r / min for 30 s to obtain ultra-high strength and toughness high performance concrete.

[0197] After mixing, concrete was cast into 150mm*150mm*150mm standard compression test blocks, 150mm*150mm*550mm standard flexural test blocks, and 150mm*150mm*150mm standard tensile test blocks. After demolding, they were placed in a standard curing room for curing. Tests were carried out at the corresponding ages. The mechanical properties of the above examples and comparative examples were tested according to GB50081-2019. The results are as follows:

[0198]

[0199] Comparative Example 2

[0200] An ultra-high strength and toughness high performance concrete, the raw materials of which, calculated by weight, include:

[0201] 550 parts of cement,

[0202] 50 parts of mineral powder,

[0203] 100 parts micro beads,

[0204] 50 parts of silica fume,

[0205] 495 parts of medium sand in Zone II,

[0206] 347 parts of 5-10mm gravel,

[0207] 809 parts of 10-20mm gravel,

[0208] 26 parts of N-n-butyl-N-methylethanolamine,

[0209] 45 parts of fibers, the fibers comprising copper-coated steel fibers and carbon fibers in a mass ratio of 28:8;

[0210] 115 parts water;

[0211] 5.5 parts of densifier;

[0212] 10 parts of polycarboxylate water reducer;

[0213] 20 parts epoxy resin;

[0214] The method for preparing the ultra-high strength and toughness high performance concrete comprises the following steps:

[0215] A. Mix the medium sand in zone II, 5-10 mm crushed stone, 10-20 mm crushed stone, cement, silica fume, mineral powder, and microbeads at a rate of 48 r / min for 30 seconds to obtain premix a;

[0216] B. Weigh water, densifier, polycarboxylate water reducer and N-n-butyl-N-methylethanolamine according to the formula;

[0217] The weighed water was divided into two parts, one of which was added with a densifier and a polycarboxylate water-reducing agent, mixed and stirred at a rate of 48 r / min for 30 s, and then added to the premix a to obtain a premix b1;

[0218] Another portion of water was added with N-n-butyl-N-methylethanolamine, mixed and stirred at a rate of 48 r / min for 30 s, and then added to premix b1 to obtain premix b2;

[0219] C. Add the fiber to premix b2 and mix and stir at a rate of 48 r / min for 50 s to obtain premix c;

[0220] D. Add epoxy resin to premix c, mix and stir at a rate of 48 r / min for 30 s to obtain ultra-high strength and toughness high performance concrete.

[0221] After mixing, concrete was cast into 150mm*150mm*150mm standard compression test blocks, 150mm*150mm*550mm standard flexural test blocks, and 150mm*150mm*150mm standard tensile test blocks. After demolding, they were placed in a standard curing room for curing. Tests were carried out at the corresponding ages. The mechanical properties of the above examples and comparative examples were tested according to GB50081-2019. The results are as follows:

[0222]

[0223] Comparative Example 3

[0224] An ultra-high strength and toughness high performance concrete, the raw materials of which, calculated by weight, include:

[0225] 550 parts of cement,

[0226] 50 parts of mineral powder,

[0227] 100 parts micro beads,

[0228] 50 parts of silica fume,

[0229] 495 parts of medium sand in Zone II,

[0230] 347 parts of 5-10mm gravel,

[0231] 809 parts of 10-20mm gravel,

[0232] 26 parts of triethanolamine dodecylbenzenesulfonate,

[0233] 45 parts of fibers, the fibers comprising copper-coated steel fibers and carbon fibers in a mass ratio of 28:8;

[0234] 115 parts water;

[0235] 5.5 parts of densifier;

[0236] 10 parts of polycarboxylate water reducer;

[0237] 20 parts epoxy resin;

[0238] The method for preparing the ultra-high strength and toughness high performance concrete comprises the following steps:

[0239] A. Mix the medium sand in zone II, 5-10 mm crushed stone, 10-20 mm crushed stone, cement, silica fume, mineral powder, and microbeads at a rate of 48 r / min for 30 seconds to obtain premix a;

[0240] B. Weigh water, densifier, polycarboxylate water reducer and triethanolamine dodecylbenzenesulfonate according to the formula;

[0241] The weighed water was divided into two parts, one of which was added with a densifier and a polycarboxylate water-reducing agent, mixed and stirred at a rate of 48 r / min for 30 s, and then added to the premix a to obtain a premix b1;

[0242] Another portion of water was added to triethanolamine dodecylbenzenesulfonate, mixed and stirred at a rate of 48 r / min for 30 s, and then added to premix b1 to obtain premix b2;

[0243] C. Add the fiber to premix b2 and mix and stir at a rate of 48 r / min for 50 s to obtain premix c;

[0244] D. Add epoxy resin to premix c, mix and stir at a rate of 48 r / min for 30 s to obtain ultra-high strength and toughness high performance concrete.

[0245] After mixing, concrete was cast into 150mm*150mm*150mm standard compression test blocks, 150mm*150mm*550mm standard flexural test blocks, and 150mm*150mm*150mm standard tensile test blocks. After demolding, they were placed in a standard curing room for curing. Tests were carried out at the corresponding ages. The mechanical properties of the above examples and comparative examples were tested according to GB50081-2019. The results are as follows:

[0246]

[0247] Comparative Example 4

[0248] An ultra-high strength and toughness high performance concrete, the raw materials of which, calculated by weight, include:

[0249] 550 parts of cement,

[0250] 50 parts of mineral powder,

[0251] 100 parts micro beads,

[0252] 50 parts of silica fume,

[0253] 495 parts of medium sand in Zone II,

[0254] 347 parts of 5-10mm gravel,

[0255] 809 parts of 10-20mm gravel,

[0256] 26 parts admixture,

[0257] 45 parts of fibers, the fibers comprising copper-coated steel fibers and carbon fibers in a mass ratio of 28:8;

[0258] 115 parts water;

[0259] 5.5 parts of densifier;

[0260] 10 parts of polycarboxylate water reducer;

[0261] The admixture comprises N-n-butyl-N-methylethanolamine and triethanolamine dodecylbenzenesulfonate in a mass ratio of 1:0.5.

[0262] The method for preparing the ultra-high strength and toughness high performance concrete comprises the following steps:

[0263] A. Mix the medium sand in zone II, 5-10 mm crushed stone, 10-20 mm crushed stone, cement, silica fume, mineral powder, and microbeads at a rate of 48 r / min for 30 seconds to obtain premix a;

[0264] B. Weigh water, densifier, polycarboxylate water reducer and admixture according to the formula;

[0265] The weighed water was divided into two parts, one of which was added with a densifier and a polycarboxylate water-reducing agent, mixed and stirred at a rate of 48 r / min for 30 s, and then added to the premix a to obtain a premix b1;

[0266] Another portion of water was added with the admixture, mixed and stirred at a rate of 48 r / min for 30 s, and then added to the premix b1 to obtain premix b2;

[0267] C. Add the fiber to the premix b2, mix and stir at a rate of 48 r / min for 50 s to obtain ultra-high strength and toughness high performance concrete.

[0268] After mixing, concrete was cast into 150mm*150mm*150mm standard compression test blocks, 150mm*150mm*550mm standard flexural test blocks, and 150mm*150mm*150mm standard tensile test blocks. After demolding, they were placed in a standard curing room for curing. Tests were carried out at the corresponding ages. The mechanical properties of the above examples and comparative examples were tested according to GB50081-2019. The results are as follows:

[0269]

[0270] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ultra-high strength and toughness high performance concrete, characterized in that: Calculated by mass, the raw materials include: 500-600 parts of cement, 40-60 parts of mineral powder, 90-110 parts micro beads, 40-60 parts of silica fume, 490-500 parts of medium sand in zone II, 340-355 parts of 5-10mm gravel, 800-815 parts of 10-20mm gravel, 20-30 parts of admixture, 40-50 servings of fiber, 110-120 parts water; 5-6 parts of densifier; 8-15 parts of polycarboxylate water reducer; 10-25 parts of epoxy resin; The admixture comprises N-n-butyl-N-methylethanolamine and triethanolamine dodecylbenzenesulfonate in a mass ratio of 1:0.4-0.

6.

2. The ultra-high strength and toughness high performance concrete according to claim 1, characterized in that: The epoxy resin is E42 epoxy resin.

3. The ultra-high strength and toughness high performance concrete according to claim 1, characterized in that: The polycarboxylate water reducer is polycarboxylate TDHKI.

4. The ultra-high strength and toughness high performance concrete according to claim 1, characterized in that: The fibers include copper-plated steel fibers and carbon fibers in a mass ratio of 25-30:5-10.

5. The ultra-high strength and toughness high performance concrete according to claim 4, characterized in that: The carbon fiber is a small tow carbon fiber T700; the copper-plated steel fiber has a nominal diameter of 0.75 mm, an aspect ratio of 0.8, and a tensile strength of >1,000 MPa.

6. The ultra-high strength and toughness high performance concrete according to claim 1, characterized in that: The densifier is F-511B waterproof densifier.

7. The ultra-high strength and toughness high performance concrete according to claim 1, characterized in that: The cement is P•O52.5 grade silicate cement, and the mineral powder is S105 grade mineral powder.

8. The ultra-high strength and toughness high performance concrete according to claim 1, characterized in that: The 28d activity index of the microbeads is 115%, and the SiO2 content of the silica fume is 92%.

9. The method for preparing ultra-high strength and high performance concrete according to claim 1, wherein: The following steps are involved: A. Mix the medium sand in zone II, 5-10 mm crushed stone, 10-20 mm crushed stone, cement, silica fume, mineral powder and microbeads to obtain premix a; B. Weigh water, densifier, polycarboxylate water reducer and admixture according to the formula; Divide the weighed water into two parts, add a densifier and a polycarboxylate water-reducing agent to one part, mix and stir, and then add it to the premix a to obtain a premix b1; Another portion of water is added to the admixture, mixed and stirred, and then added to the premix b1 to obtain premix b2; C. Add the fiber to the premix b2, mix and stir to obtain a premix c; D. Add epoxy resin to premix c, mix and stir to obtain ultra-high strength and toughness high performance concrete.

10. The method for preparing ultra-high strength and high performance concrete according to claim 9, characterized in that: The stirring rate is 40-55 r / min, and the stirring time is 30-50 s.

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