A kind of concrete admixture mainly composed of marble powder and reducing bleeding type and preparation method thereof

A marble and concrete technology, applied in the field of building materials, can solve the problem of inability to completely dispose of stone powder waste, and achieve the effects of good concrete homogeneity, reduced bleeding, and improved cohesion

Active Publication Date: 2021-11-23
FUJIAN KZJ NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the above methods, Nanan consumes about 700,000 tons of waste stone powder every year, but it is still unable to completely treat the waste stone powder

Method used

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  • A kind of concrete admixture mainly composed of marble powder and reducing bleeding type and preparation method thereof
  • A kind of concrete admixture mainly composed of marble powder and reducing bleeding type and preparation method thereof
  • A kind of concrete admixture mainly composed of marble powder and reducing bleeding type and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of grinding aid: 50.00g of triethanolamine, 50.00g of triethylenepropanolamine, 60.00g of molasses, urea solution (16.00g of urea, 84.00g of water), glycerin (2.00g of glycerin, 98.00g of water), drip Add it into 640.00g of water for reaction, raise the temperature to 50°C for reaction, and add it dropwise for 1 hour to obtain a grinding aid.

[0026] (2) Preparation of modified marble powder: Put 5000.00 g of waste marble powder and 1.00 g of grinding aid into a ball mill, grind for 20 minutes, and keep 60°C during the process to prepare modified marble powder.

[0027] (3) Preparation of powder polycarboxylate superplasticizer: Add 2.00 g of stabilizer anhydrous sodium acetate to 1000.00 g of polycarboxylate water reducer mother liquor, control the temperature at 100° C., and centrifugally dry to obtain powder polycarboxylate superplasticizer.

[0028] (4) Preparation of water-retaining agent: Mix 100.00 g of powder polycarboxylate superplasticizer, 20...

Embodiment 2

[0033] (1) Grinding aid preparation: N, N dimethylethanolamine 60.00g, diethanol monoisopropanolamine 40.00g, molasses 70.00g, urea solution (urea 20.00g, water 80.00g), glycerin (glycerin 2.50g , water 97.50g), added dropwise into 630.00g water to react, heated up to 45°C for reaction, and the dropwise addition time was 0.75h to obtain a grinding aid.

[0034] (2) Preparation of modified marble stone powder: Add 5000.00 g of waste marble stone powder and 1.20 g of grinding aid into a ball mill, grind for 25 minutes, and keep 60° C. during the process to prepare modified marble stone powder.

[0035] (3) Preparation of powder polycarboxylate superplasticizer: Add 1.50 g of stabilizer active anhydrous copper sulfate and 1.00 g of sodium sulfate to 1000.00 g of polycarboxylate water reducer mother liquor, control the temperature at 100 ° C, and centrifugally dry to obtain powder poly Carboxylic acid superplasticizer.

[0036] (4) Preparation of water-retaining agent: Mix 100.00...

Embodiment 3

[0041](1) Grinding aid preparation: 60.00g of N,N-dibenzylethanolamine, 20.00g of diethanolamine, 20.00g of diethanol monoisopropanolamine, 70.00g of molasses, urea solution (20.00g of urea, 80.00g of water) 1. Glycerin (3.50 g of glycerol, 96.50 g of water), was added dropwise into 630.00 g of water for reaction, and the temperature was raised to 45° C. for reaction, and the dropwise addition time was 1.5 h to obtain a grinding aid.

[0042] (2) Preparation of modified marble powder: Put 5000.00 g of waste marble powder and 1.50 g of grinding aid into a ball mill, grind for 25 minutes, and keep 60°C during the process to prepare modified marble powder.

[0043] (3) Preparation of powder polycarboxylate superplasticizer: Add 1.50 g of stabilizer potassium carbonate and 1.00 g of anhydrous sodium acetate to 1000.00 g of polycarboxylate water reducer mother liquor, control the temperature at 100 ° C, and centrifugally dry to obtain powder polycarboxylate Acid superplasticizer. ...

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Abstract

The invention relates to the field of building materials, in particular to a bleeding-reducing concrete admixture mainly composed of marble stone powder and a preparation method thereof, comprising the following components in parts by weight: 50-70 parts of modified marble stone powder, superfine powder 10-20 parts of coal ash, 10-20 parts of silica fume, and 1-5 parts of water-retaining agent. The preparation method is to add water-retaining agent and silica fume to the mixer at the same time and stir for 10-20 minutes, then add ultra-fine fly ash, Stir for 10-20 minutes, finally add modified marble stone powder and stir for 20-30 minutes, and mix uniformly to prepare the bleeding-reducing concrete admixture. The present invention introduces modified marble stone powder, superfine fly ash, and silica fume and optimizes them to increase the flow rate of concrete and improve pumping performance, and at the same time introduces water-retaining agent to improve the homogeneity of concrete, reduce bleeding of concrete and improve concrete Homogeneity, can be widely used in the construction of pumped concrete, medium and low grade concrete.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a bleeding-reducing concrete admixture mainly composed of marble stone powder and a preparation method thereof. Background technique [0002] In recent years, with the continuous improvement of modern construction technology, the continuous refresh of building heights, the increase of labor costs, and the vigorous promotion of prefabricated buildings, the pumping height of pumped concrete, the filling performance of self-compacting concrete, the anti-segregation performance and The production efficiency and apparent quality of precast concrete have put forward high requirements. [0003] Common admixtures such as fly ash and mineral powder can improve pumpability, filling performance and fluidity in concrete, but concrete is prone to segregation, bleeding, laitance, bubbling, apparent quality, etc. defect problem. In pumped concrete, especially high-grade concrete, the effect ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38
CPCC04B40/0039C04B14/285C04B24/122C04B18/18C04B24/126C04B24/02C04B24/04C04B24/16C04B2103/302C04B24/383C04B18/08C04B18/146C04B22/142C04B22/147C04B24/00C04B22/10C04B24/32
Inventor 邱岳涛尹键丽林添兴尹峻郭元强李英祥
Owner FUJIAN KZJ NEW MATERIALS CO LTD
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