JP2021172578A - Lightweight high-strength concrete - Google Patents

Abstract

To provide a lightweight high-strength concrete, and a method for producing the same.SOLUTION: In a lightweight high-strength concrete, a mixing ratio of materials, namely, (iron ore slag):(fly ash modified by D-arabinose acid calcium and D-arabinose acid glyceride):(nano ceramic fiber):(nano alumina):(basalt fiber):(high-efficiency water-reducing agent):(Portland cement):(sand):(crushed stone):(sodium carbonate):(sodium hydroxide):(water) is 1:0.05:0.04:0.01:0.05:0.005:1.5:2:3.5:0.04:0.05:0.5. A specific surface area of the iron ore slag is 600 to 750 m2/kg. The fly ash modified by D-arabinose acid calcium and D-arabinose acid glyceride is super-fine flay ash.SELECTED DRAWING: None

Description

The present invention belongs to the field of concrete technology, and specifically relates to high-strength light concrete.

With the rapid development of urban construction, the number of construction works is increasing day by day, and the quality and production cost of the works are the keys to the competition among construction companies. The quality of building materials directly determines the quality and cost of construction work. Among the building materials, concrete is the main raw material. Currently, river sand and sea sand are added to concrete, which consumes a large amount of resources, and river sand and sea sand are natural resources with limited reserves. Long-term mining leads to resource depletion and ecology. Break the balance of the system. In addition, mining river sand and sea sand significantly increases the cost of producing concrete per unit volume. In addition, sea sand contains chlorine-containing substances that are harmful to construction work, which reduce the durability and quality of construction work. Ordinary cement concrete has drawbacks such as poor deformability, low tensile strength, low ultimate elongation, poor toughness, and the gel after curing easily shrinks and cracks. As the strength increases, these drawbacks become more and more pronounced. The brittleness of ordinary cement concrete seriously impairs safety and durability, seriously limits the further application of cement concrete, and cannot cope with current energy-saving buildings.

Currently, CN103467014A discloses what is related to concrete, replaces most sand and stones with debris, fully exerts the effect of CTF concrete synergizer, increases the dispersibility of cement particles, and enhances the effect of water reducing agent. The problem of poor cohesiveness and water retention of fresh concrete due to poor particle size distribution of stone and sand, and easy separation was solved. However, since the above concrete is made by mixing debris and stone with cement, when the cement hardens rapidly, the debris disperses unevenly in the cement and easily causes cracks in the cement.

Chinese Patent Application Publication No. 1034670114

An object of the present invention is to provide high-strength light concrete in order to solve the above technical problems.

High-strength light concrete, the raw materials are iron slag, fly ash modified with D-calcium arabinoate and D-arabinonic acid glyceride, nanoceramic fiber, nanoalumina, genbuiwa fiber, high-performance water reducing agent, Includes Portland cement, sand, crushed stone, sodium carbonate, sodium hydroxide, and water.

The mixing ratio of the raw materials is as follows: fly ash modified with iron slag: calcium D-arabinate and D-arabinonic acid glyceride: nanoceramic fiber: nanoalumina: genbuiwa fiber: high-performance water reducing agent: Portland cement: sand. : Crushed stone: Sodium carbonate: Sodium hydroxide: Water = 1: 0.05 to 0.15: 0.04 to 0.12: 0.01 to 0.03: 0.05 to 0.3: 0.005 to It is 0.02: 1.5 to 3.5: 2 to 4: 3.5 to 6.5: 0.04 to 0.08: 0.05 to 0.15: 0.5 to 1.

The specific surface area of the iron slag is 600 to 750 m2 / kg.
The fly ash modified with calcium D-arabinose and D-arabinonic acid glyceride is ultrafine fly ash.

The fly ash modified with calcium D-arabinose and D-arabinose glyceride is prepared by the following steps.
Calcium D-arabinate: D-arabinonic acid glyceride: water was dissolved at a mixing ratio of 5: 3: 1 at 100 ° C., 200% fly ash by mass of calcium D-arabinate was added, and the mixture was stirred for 3 hours. It is then centrifuged and placed in a 120 ° C. dryer to dry.

The method for producing high-strength light concrete includes step 1, step 2, and step 3.
In step 1, crushed stone, iron slag and sand are mixed at the above mixing ratio and stirred uniformly to obtain a mixture A.
Step 2, water, fly ash modified with Portland cement and D-arabinonic acid glyceride, high-performance water reducing agent, genbuiwa fiber, sodium carbonate, and sodium hydroxide are mixed in the above mixing ratio. And stir uniformly to obtain mixture B.
In step 3, the mixture A is put into the mixture B, and the nanoceramic fibers and nanoalumina are put in the mixture B with stirring, and the mixture is uniformly stirred to obtain the high-strength light concrete.

In the present invention, fly ash modified with calcium D-arabinate and D-arabinonic acid glyceride is added to concrete, and the hydroxy between calcium D-arabinate and D-arabinonic acid glyceride is Si-O by intermolecular force. --- H-O-CH2 (CHOH) 3COO --- Al-O-Si bond and Si-O --- H-O-CH2 (CHOH) 3COOCH2 CHOHCH2OH --- O-Si-O-Al bond ( --- is an intermolecular force, for example, a weak bond such as a hydrogen bond or an ionic bond) is formed, and the glycerin-modified fly ash produced in the present invention changes the spatial structure of the fly ash from the inside of the fly ash. Fly ash, which increased the tensile strength of concrete by 200% and was modified with D-calcium arabinoate and D-arabinonic acid glyceride, was placed between nanoalumina and Portland cement, Si-O --- H-O-. CH2CH (O --- SiO32-) CHOHCHOHCOO --- Al3 + -O-Si ion bond is formed, and the fly ash modified by calcium D-arabinate and D-arabinonic acid glyceride is nanoalumina, sodium carbonate and water. Together with sodium oxide, it forms a composite activator and acts on iron slag with a specific surface area of 600 to 750 m2 / kg to sufficiently elute iron in the iron slag, and iron is combined with glycerin-modified fly ash and Portland cement. It acts on the formation of ionic bonds between, promotes the setting of Portland cement, and the modified fly ash can improve the water retention of concrete.
By adding nanoceramic fibers and nanoalumina to concrete, the thermal stress of concrete during cooling can be dispersed and the crack resistance of concrete can be improved.

Example 1 High-strength light concrete with a mixing ratio of raw materials: fly ash modified with iron slag: calcium D-arabinate and D-arabinonic acid glyceride: nanoceramic fiber: nanoalumina: genbuiwa fiber. : High-performance water reducing agent: Portland cement: Sand: Crushed stone: Sodium carbonate: Sodium hydroxide: Water = 1: 0.05: 0.04: 0.01: 0.05: 0.005: 1.5: 2 : 3.5: 0.04: 0.05: 0.5.
The specific surface area of the iron slag is 600 to 750 m2 / kg.
The fly ash modified with calcium D-arabinose and D-arabinonic acid glyceride is ultrafine fly ash.
The fly ash modified with calcium D-arabinose and D-arabinose glyceride is prepared by the following steps.
Calcium D-arabinate: D-arabinonic acid glyceride: water was dissolved at a mixing ratio of 5: 3: 1 at 100 ° C., 200% fly ash by mass of calcium D-arabinate was added, and the mixture was stirred for 3 hours. It is then centrifuged and placed in a 120 ° C. dryer to dry.
The method for producing high-strength light concrete includes step 1, step 2, and step 3.
In step 1, crushed stone, iron slag and sand are mixed at the above mixing ratio and stirred uniformly to obtain a mixture A.
Step 2, water, fly ash modified with Portland cement and D-arabinonic acid glyceride, high-performance water reducing agent, genbuiwa fiber, sodium carbonate, and sodium hydroxide are mixed in the above mixing ratio. And stir uniformly to obtain mixture B.
In step 3, the mixture A is put into the mixture B, and the nanoceramic fibers and nanoalumina are put in the mixture B with stirring, and the mixture is uniformly stirred to obtain the high-strength light concrete.

Example 2 The difference from Example 1 is that the mixing ratio of the raw materials in Example 2 is as follows: fly ash modified with iron slag: calcium D-arabinate and D-arabinonic acid glyceride: nanoceramic fiber: nanoalumina: Genbu rock fiber: High-performance water reducing agent: Portland cement: Sand: Crushed stone: Sodium carbonate: Sodium hydroxide: Water = 1: 0.10: 0.08: 0.02: 0.15: 0.01: 2.5 : 3: 5: 0.06: 0.10: 0.75.

Example 3 The difference from Example 1 is that the mixing ratio of the raw materials in Example 3 is as follows: fly ash modified with iron slag: calcium D-arabinate and D-arabinonic acid glyceride: nanoceramic fiber: nanoalumina: Genbu rock fiber: High-performance water reducing agent: Portland cement: Sand: Crushed stone: Sodium carbonate: Sodium hydroxide: Water = 1: 0.15: 0.12: 0.03: 0.3: 0.02: 3.5 : 4: 6.5: 0.08: 0.15: 1.

Comparative Example 1 The difference from Example 1 is that the mixing ratio of the raw materials in Comparative Example 1 is: iron slag: normal fly ash: high-performance water reducing agent: Portland cement: sand: crushed stone: sodium carbonate: sodium hydroxide. : Water = 1: 0.05: 0.005: 1.5: 2: 3.5: 0.04: 0.05: 0.5.
The usual fly ash is ultrafine fly ash.
The specific surface area of the iron slag is 600 to 750 m2 / kg.

Comparative Example 2 The difference from Example 1 is that the mixing ratio of the raw materials in Comparative Example 2 is: iron slag: unmodified fly ash: nanoceramic fiber: nanoalumina: genbuiwa fiber: high-performance water reducing agent: port. Land cement: Sand: Crushed stone: Sodium carbonate: Sodium hydroxide: Water = 1: 0.05: 0.04: 0.01: 0.05: 0.005: 1.5: 2: 3.5: 0. 04: 0.05: 0.5.
The specific surface area of the iron slag is 600 to 750 m2 / kg.
The unmodified fly ash is an ultrafine powder fly ash.

Comparative Example 3 High-strength light concrete with a mixing ratio of raw materials: iron slag: fly ash modified with calcium D-arabinate and D-arabinonic acid glyceride: nanoceramic fiber: nanoalumina: genbuiwa fiber. : High-performance water reducing agent: Portland cement: Sand: Crushed stone: Sodium carbonate: Sodium hydroxide: Water = 1.5: 0.02: 0.02: 0.04: 0.04: 0.003: 1.0 1: 3.0: 0.02: 0.02: 0.4.
The specific surface area of the iron slag is 600 to 750 m2 / kg.
The fly ash modified with calcium D-arabinose and D-arabinonic acid glyceride is ultrafine fly ash.
The fly ash modified with calcium D-arabinose and D-arabinose glyceride is prepared by the following steps.
Calcium D-arabinate: D-arabinonic acid glyceride: water was dissolved at a mixing ratio of 5: 3: 1 at 100 ° C., 200% fly ash by mass of calcium D-arabinate was added, and the mixture was stirred for 3 hours. It is then centrifuged and placed in a 120 ° C. dryer to dry.
The method for producing high-strength light concrete includes step 1, step 2, and step 3.
In step 1, crushed stone, aluminum slag, and sand are mixed at the above mixing ratio and stirred uniformly to obtain a mixture A.
Step 2, the above mixing ratio, water, Portland cement, fly ash modified with D-calcium arabinoate and D-arabinonic acid glyceride, high-performance water reducing agent, genbu rock fiber, sodium carbonate. And sodium hydroxide are mixed and stirred uniformly to obtain mixture B.
In step 3, the mixture A is put into the mixture B, and the nanoceramic fibers and nanoalumina are put in the mixture B with stirring, and the mixture is uniformly stirred to obtain the high-strength light concrete.

Mechanical property test The mechanical property test of the high-strength light concrete was carried out in accordance with "Light Aggregate Concrete Technical Procedure" JGJ51-90, and the concrete in Example 1 and Example 2 and Example 3 and Comparative Example 1 was used. , Make a plurality of cube test blocks with a side length of 150 mm, take them out after standard curing 28d, allow them to air dry, and perform high temperature tests at 25 ° C, 200 ° C, 500 ° C, and 800 ° C, respectively, and set the cubes at the target temperature for 3 hours. After constant temperature treatment, cool to room temperature. Two cube test blocks were placed at each target temperature, and after cooling, the crushing strength and bending strength of the cube test blocks were measured and shown in Table 1, and the number of cracks on the cube surface was recorded by observing with the naked eye, and Table 2 Shown in.

表１からわかるように、２００℃、５００℃、及び８００℃の高温試験の後、比較実施例１と比較実施例２における圧壊強度と折れ曲げ強度との下がる速度は実施例一より速く、また、実施例一は８００℃の高温試験の後、圧壊強度が３０．２Ｍｐａで、折れ曲げ強度が２．３Ｍｐａであり、即ち、コンクリートにＤ‐アラビノ酸カルシウムとＤ‐アラビノン酸グリセリドによって改質されたフライアッシュと、ナノセラミック繊維と、ナノアルミナとを添加することによって、前記高強度の軽質コンクリート全体の圧壊強度と折れ曲げ強度を向上させることができ、比較実施例三において、温度の上昇とともに、圧壊強度と折れ曲げ強度がいずれも素早く下がり、即ち、最適の混合範囲内に、前記高強度の軽質コンクリートの力学性能が一番良い。

As can be seen from Table 1, after the high temperature tests at 200 ° C., 500 ° C., and 800 ° C., the rate at which the crushing strength and the bending strength in Comparative Example 1 and Comparative Example 2 decrease is faster than that in Example 1 and also. In Example 1, after a high temperature test at 800 ° C., the crushing strength was 30.2 Mpa and the bending strength was 2.3 Mpa, that is, the concrete was modified with D-calcium arabinoate and D-arabinonic acid glyceride. By adding the fly ash, nanoceramic fiber, and nanoalumina, the crushing strength and bending strength of the entire high-strength light concrete can be improved. Both the crushing strength and the bending strength decrease quickly, that is, the mechanical performance of the high-strength light concrete is the best within the optimum mixing range.

表２からわかるように、２００℃と５００℃の高温で、実施例にはいずれも割れ目が生じなく、８００℃の高温で、実施例一だけ、一つの割れ目が生じ、対して比較実施例は２００℃で、多くの割れ目が生じ、割れ目の数が温度の上昇につれて倍増し、即ち、コンクリートにＤ‐アラビノ酸カルシウムとＤ‐アラビノン酸グリセリドによって改質されたフライアッシュと、ナノセラミック繊維とを添加することで、コンクリートの耐亀裂性を向上させることができる。

As can be seen from Table 2, at high temperatures of 200 ° C. and 500 ° C., no cracks were formed in any of the examples, and at a high temperature of 800 ° C., only one crack was generated in Example 1, whereas in the comparative example, there was no crack. At 200 ° C., many cracks occur and the number of cracks doubles as the temperature rises, ie concrete with fly ash modified with D-calcium arabinoate and D-arabinonic acid glyceride and nanoceramic fibers. By adding it, the crack resistance of concrete can be improved.

Those skilled in the art can make various changes according to the working method within the scope of the present invention.

Claims (6)

High-strength light concrete, the raw materials are iron slag, fly ash modified with D-calcium arabinoate and D-arabinonic acid glyceride, nanoceramic fiber, nanoalumina, genbuiwa fiber, high-performance water reducing agent, Includes Portland cement, sand, crushed stone, sodium carbonate, sodium hydroxide, and water,
High-strength light concrete characterized by this. The mixing ratio of the raw materials is as follows: fly ash modified with iron slag: calcium D-arabinate and D-arabinonic acid glyceride: nanoceramic fiber: nanoalumina: genbuiwa fiber: high-performance water reducing agent: Portland cement: sand. : Crushed stone: Sodium carbonate: Sodium hydroxide: Water = 1: 0.05 to 0.15: 0.04 to 0.12: 0.01 to 0.03: 0.05 to 0.3: 0.005 to 0.02: 1.5 to 3.5: 2 to 4: 3.5 to 6.5: 0.04 to 0.08: 0.05 to 0.15: 0.5 to 1.
The high-strength light concrete according to claim 1. The fly ash modified with calcium D-arabinose and D-arabinose glyceride is prepared by the following steps.
Calcium D-arabinate: D-arabinonic acid glyceride: water was dissolved at a mixing ratio of 5: 3: 1 at 100 ° C., 200% fly ash by mass of calcium D-arabinate was added, and the mixture was stirred for 3 hours. Later centrifuge and place in a 120 ° C. dryer to dry,
The high-strength light concrete according to claim 1. The specific surface area of the iron slag is 600 to 750 m2 / kg.
The high-strength light concrete according to claim 1. The fly ash modified with calcium D-arabinose and D-arabinonic acid glyceride is ultrafine fly ash.
The high-strength light concrete according to claim 1. The method for producing high-strength light concrete, which includes step 1, step 2, and step 3.
In step 1, crushed stone, iron slag and sand are mixed at the above mixing ratio and stirred uniformly to obtain a mixture A.
Step 2, water, fly ash modified with Portland cement and D-arabinonic acid glyceride, high-performance water reducing agent, genbuiwa fiber, sodium carbonate, and sodium hydroxide are mixed in the above mixing ratio. And stir uniformly to obtain mixture B,
In step 3, the mixture A is put into the mixture B, and the nanoceramic fiber and the nanoalumina are put in the mixture B with stirring, and the mixture is uniformly stirred to obtain the high-strength light concrete.
The method for producing high-strength light concrete according to claim 1 or 2, or 3, 3 or 4, or 5.