Method for using waste concrete as active admixture in cement production

A technology for waste concrete and admixtures, applied in the field of active admixtures, can solve the problems of unsatisfactory psychological acceptability of economic performance and users, and achieve the effects of complete resource utilization, increased heat consumption, and simple process

Active Publication Date: 2013-11-20
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing methods are unsatisfactory in terms of economic performance of practical application and psychological acceptability of users. Therefore, there is an urgent need for a new economically feasible method to solve the problem of waste concrete utilization. An Economical Way to Expand the Supply Path of Cement Admixtures Problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The Φ3×47m dry-process rotary kiln production line of a certain factory, when it was in normal production, the (primary) clinker standard consistency was 22.4-25.1%, the initial setting time was 85min-138min, the average initial setting time was 117min, and the final setting time was 126min-183min. The final setting time is 158min. The 3-day average compressive strength is 28.1MPa, the average flexural strength is 3.1MPa, the 28-day average compressive strength is 54.6MPa, and the average flexural strength is 5.7MPa. The original admixture of the plant uses coal cinder, black shale and slag in a ratio of 1:1:1, and the gypsum uses natural dihydrate gypsum. The total amount of 32.5 grade cement admixture is 48%, the standard consistency of cement is 24.1-25.5%, the average initial setting time is 147min, the average final setting time is 215min, the average compressive strength of 3 days is 16.3MPa, the average flexural strength is 1.9MPa, 28 days The average compressiv...

Embodiment 2

[0030] A Φ4.3×64m dry-process rotary kiln production line in a factory, when it was in normal production, the (primary) clinker standard consistency was 22.8-24.9%, the initial setting time was 121min-173min, the average initial setting time was 154min, and the final setting time was 191min-233min , The average final setting time is 216min. The 3-day average compressive strength is 29.1MPa, the average flexural strength is 3.2MPa, the 28-day average compressive strength is 56.5MPa, and the average flexural strength is 5.5MPa. The original admixture of the plant is limestone, black shale and manganese slag in a ratio of 1:2:2, and the gypsum is desulfurized dihydrate gypsum. The amount of 32.5 grade cement admixture is 45%, the standard consistency of cement is 24.3-25.5%, the average initial setting time is 185min, the average final setting time is 243min, the average compressive strength of 3 days is 15.6MPa, the average flexural strength is 1.7MPa, the average 28-day The co...

Embodiment 3

[0033] A Φ3.5×50m dry-process rotary kiln production line in a factory, when it was in normal production, the (primary) clinker standard consistency was 22.4-24.3%, the initial setting time was 95min-139min, the average initial setting time was 117min, and the final setting time was 151min-183min , The average final setting time is 168min. The 3-day average compressive strength is 28.7MPa, the average flexural strength is 2.9MPa, the 28-day average compressive strength is 58.5MPa, and the average flexural strength is 5.7MPa. The original admixture of the plant uses fly ash, raw gangue and slag in a ratio of 1:1:1, and the gypsum uses natural dihydrate gypsum. The amount of 32.5 grade cement admixture is 45%, the standard consistency of cement is 24.2-25.3%, the average initial setting time is 157min, the average final setting time is 216min, the average compressive strength of 3 days is 17.5MPa, the average flexural strength is 1.9MPa, and the 28-day average The compressive s...

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Abstract

The invention relates to a method for using waste concrete as active admixture in cement production, which comprises steps as follows: waste concrete is crushed into a particle material with the particle size of at most 40mm; in a rotary kiln cement production process, high-temperature clinker is added to a section between a clinker cooling zone of the rotary kiln head and the blanking port, or a high-temperature space section with the clinker temperature of at least 550 DEG C in the grate cooler; waste heat of the high-temperature clinker is directly utilized to perform thermal activation treatment on the particle waste concrete, and the waste concrete subjected to clinker waste heat activation treatment is mixed in the clinker to be directly used as the active admixture in the clinker; and the waste concrete accounts for 1-30 wt% of the primary clinker fired in the rotary kiln. The invention is simple and easy to implement, has the advantages of no investment pressure and favorable economical efficiency, can be accepted by people, can solve the problems of shortage and cost of the admixture to some extent, is beneficial to inhibiting abundant utilization of inferior admixtures, especially raw shale, raw dirt, douke and the like, in the cement grinding, and lowers the probability of jerry-built projects.

Description

technical field [0001] The invention relates to a method of using waste concrete as an active admixture in cement production. Background technique [0002] Cement, as one of the largest building materials, usually adds a certain amount of admixtures in order to reduce its production cost or improve certain properties, that is, cement is usually made of clinker, admixtures, and gypsum through a clinker batching system. After grinding the mixture. The commonly used active admixture is water-quenched slag, followed by phosphorus slag, steel slag, coal slag, fly ash and other metallurgical waste. Depending on the type of cement and its strength grade, the amount of admixtures usually accounts for 5-50%. In order to reduce production costs, the amount of admixture used by some cement manufacturers is as high as 60-80%. Due to the huge demand for admixtures and the limited sources of active admixtures available, many companies have to use specially roasted gangue, burnt shale, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/42
CPCC04B7/246Y02P40/10
Inventor 尹小林尹无忌
Owner 长沙紫宸科技开发有限公司
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