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Machine-made sand regulator for concrete

A sand conditioner and concrete technology, applied in the field of concrete processing, can solve the problems of uncontrollable gradation, inability to ensure long-term stability of slump, poor gradation, etc.

Active Publication Date: 2021-06-04
深圳市天祥新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, CN107555897 discloses a ready-mixed mortar containing three-stage sand blending, which is compounded from cement, artificial sand, ultra-fine sand, machine-made sand, water, admixture, water reducing agent and regulator. Based on the compounding mechanism of concrete admixtures, the invention proposes to use water reducer as the main agent, supplemented by regulators with good compatibility, so as to obtain suitable mortar working performance and improve the use effect of mortar. Good results have been achieved in terms of strength, cohesiveness and other working properties, which meet the requirements of the standard, and effectively solve the problem of uncontrollable gradation of raw materials such as ultra-fine sand in ready-mixed mortar. However, it cannot be guaranteed The slump is stable for a long time

Method used

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  • Machine-made sand regulator for concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Water reducers are made through the following steps:

[0040]Step A: Add phthalic anhydride and trishydroxymethylaminomethane into a four-necked flask, then add ethanol to dissolve it completely, then place the four-necked flask in an oil bath and heat to 85°C, and reflux for 10h, then Cool down to room temperature, transfer the solution to a container, place in an oven and dry under vacuum at 35°C to obtain intermediate product 1, wherein the ratio of phthalic anhydride, trishydroxymethylaminomethane and ethanol is 0.1mol: 0.1mol: 150mL;

[0041] Step B: Add the intermediate product 1 and 1,2-hexanediol obtained in step A into a four-necked flask, mix well, slowly add concentrated sulfuric acid, and heat the temperature of the reaction system to 65 ° C, under nitrogen protection After reacting under stirring for 3 hours, the intermediate product 2 was finally obtained, wherein the mass ratio of the intermediate product 1, 1,2-hexanediol, and concentrated sulfuric acid...

Embodiment 2

[0045] Water reducers are made through the following steps:

[0046] Compared with embodiment 1:

[0047] The preparation steps are the same, the difference is:

[0048] In step A, the consumption ratio of phthalic anhydride, trishydroxymethylaminomethane and ethanol is 0.1mol:0.12mol:200mL;

[0049] In step B, the mass ratio of intermediate product 1, 1,2-hexanediol and concentrated sulfuric acid is 250:70:2.5;

[0050] In step C, the addition mass ratio of prenol polyoxyethylene ether and epichlorohydrin is 120:5; Catalyst A is aluminum chloride; The molecular weight of prenol polyoxyethylene ether is 2400, and small monomer is Hydroxyethyl methacrylate phosphate;

[0051] The intermediate product 2 in step D, the reaction solution obtained in step C, ammonium persulfate and deionized water, solution A, and solution B are in a ratio of 10:60:0.05:80:90:45; solution A is acrylic acid, small single Solution B is a mixture of thioglycolic acid, ascorbic acid and deionized w...

Embodiment 3

[0053] Compared with embodiment 1:

[0054] The preparation steps are the same, the difference is:

[0055] In step A, the consumption ratio of phthalic anhydride, trishydroxymethylaminomethane and ethanol is 0.1mol:0.15mol:350mL;

[0056] In step B, the mass ratio of intermediate product 1, 1,2-hexanediol and concentrated sulfuric acid is 300:90:3;

[0057] In step C, the addition mass ratio of prenol polyoxyethylene ether and epichlorohydrin is 130:7; Catalyst A is ferric chloride; The molecular weight of prenol polyoxyethylene ether is 3600, small monomer It is a mixture of sodium methacrylate and hydroxyethyl methacrylate phosphate in a mass ratio of 1:1;

[0058] The intermediate product 2 in step D, the reaction solution obtained in step C, ammonium persulfate and deionized water, solution A, and solution B are in a ratio of 15:70:0.08:90:100:50; solution A is acrylic acid, small single Solution B is a mixture of thioglycolic acid, ascorbic acid and deionized water at...

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Abstract

The invention discloses a machine-made sand regulator for concrete. The machine-made sand regulator comprises the following raw materials in parts by weight: 2-5 parts of a water reducing agent, 1-3 parts of a dispersing agent, 2-5 parts of glycerol, 0.01-0.5 part of a defoaming agent, 0.01-0.05 part of an air entraining agent, 0.1-0.3 part of a retarder and 80-95 parts of deionized water. Synthetic hyperbranched ether reacts with isopentenol polyoxyethylene ether, acrylic acid and unsaturated phosphoric acid monoester monomer to form a hyperbranched carboxylic acid water reducer, and the unsaturated phosphoric acid monoester monomer is used for further modifying the carboxylic acid water reducer in the process. The water reducing agent obtained in the invention not only has the characteristics of a carboxylic acid water reducing agent, but also has the characteristics of a phosphate water reducing agent, and due to the hyperbranched structure of the molecular structure, cement particles can enter the space of the hyperbranched structure, so that the distribution of the cement particles is more stable, and the slump retentivity of concrete is improved.

Description

technical field [0001] The invention belongs to the technical field of concrete processing, and in particular relates to a machine-made sand conditioner for concrete. Background technique [0002] The amount of concrete used in my country is increasing, and natural sand resources are becoming more and more tense. With the continuous expansion of our country's infrastructure for many years, natural sand reserves have been continuously reduced after years of continuous mining. At the same time, in order to protect river embankments and dams and ecological balance, many sand fields have been rectified and shut down, and small sand fields have been eliminated. This has led to Natural sand resources are in further shortage, and natural sand is a local resource that cannot be regenerated in the short term, resulting in higher and higher prices. Driven by economic interests, random mining and digging in many places have caused serious environmental pollution problems. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42
CPCC04B40/0039C04B24/32C04B24/026C04B24/122C04B24/42C04B24/16C04B24/10C04B24/128
Inventor 张任红郭家铭庞永献张红
Owner 深圳市天祥新材料有限公司
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