Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Concrete admixture prepared by using alkali paper making liquid waste

A technology for concrete admixture and papermaking waste liquid, which is applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of difficult waste water treatment, high impurity content, high cost, etc. The effect of reducing aggregation and improving frost resistance

Inactive Publication Date: 2010-03-03
ANHUI UNIVERSITY OF TECHNOLOGY
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pulp waste liquid produced by cooking caustic soda with rice straw or wheat straw in paper mills, commonly known as black liquor, has a high impurity content, and the waste water treatment is very difficult and costly
The reason is that this waste liquid contains about 8% alkali, and the cost of extracting this alkali is very high, so paper mills cannot bear it, and they all discharge this kind of black liquor directly without treatment, causing serious pollution to rivers

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0010] 2000 grams of alkaline pulp waste liquid containing 8% free alkali was added with 1208 grams of rosin, heated at 160° C. for 30 minutes, and the obtained product was dried to obtain a powder.

[0011] The concrete formulation is as follows:

[0012] Cement (label 32.5) dosage: 230kg / m 3

[0013] Water consumption: 147kg / m 3

[0014] Water cement ratio: 0.64

[0015] Sand rate: 28.4%

[0016] The amount of powdered admixture accounted for 0.016% of the total weight of solids

example 2

[0018] 2000 grams of alkaline pulp waste liquid containing 8% free alkali was added with 1208 grams of rosin, heated at 180° C. for 20 minutes, and the obtained product was dried to obtain a powder.

[0019] The concrete formulation is as follows:

[0020] Cement (label 32.5) dosage: 230kg / m 3

[0021] Water consumption: 147kg / m 3

[0022] Water cement ratio: 0.64

[0023] Sand rate: 28.4%

[0024] The amount of powdered admixture accounted for 0.018% of the total weight of solids

example 3

[0026] 2000 grams of alkaline pulp waste liquid containing 8% free alkali was added with 1208 grams of rosin, heated at 100° C. for 80 minutes, and the obtained product was dried to obtain a powder.

[0027] The concrete formulation is as follows:

[0028] Cement (label 32.5) dosage: 230kg / m 3

[0029] Water consumption: 147kg / m 3

[0030] Water cement ratio: 0.64

[0031] Sand rate: 28.4%

[0032] The amount of powdered admixture accounted for 0.015% of the total weight of solids

[0033] The performance that the admixture that adopts example 1 technique to obtain is mixed into concrete is as follows:

[0034] Entrained air volume: 4.8%

[0035] Water reduction rate: 11.3%

[0036] Slump: 6.5

[0037] Strength: 105kg / cm2 for 28 days 2

[0038] Frost resistance: greatly improved, after 50 freeze-thaw cycles, the strength loss is only 10.3%.

[0039] The performance that the admixture that adopts example 2 technology to obtain is mixed into concrete is as follows: ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
strengthaaaaaaaaaa
sand rateaaaaaaaaaa
Login to View More

Abstract

The invention relates to a concrete admixture for buildings. The concrete admixture is prepared by using alkali paper pulp liquid wastes as raw materials, adding rosins to react for 20-80min at 100-180 DEG C to obtain a product, and carrying out spray drying on the product to obtain a powder product. The product is applied to the concrete, reduces the water consumption and greatly improves the frost resistance of the concrete due to the air entrained property under the condition of ensuring the strength of the concrete. The invention can not only reduce the environmental pollution produced bypaper mills, but also provide inexpensive admixtures with excellent quality for the cement and concrete industries, thereby being a good strategy to protect environment and turn waste into wealth.

Description

Technical field: [0001] The invention belongs to the technical category of making concrete admixture, and specifically relates to a technology for making concrete admixture by using alkaline pulp waste liquid. Background technique: [0002] Concrete admixture is an important method and technology for concrete modification, and one of the indispensable components of modern concrete. Concrete admixture technology is a new technology that has developed rapidly in recent years. Adding a small amount of admixture can improve the working performance of fresh concrete and improve the physical and mechanical properties and durability of hardened concrete. At present, concrete admixtures are natural substances or artificial compound products, which are divided into four categories according to their functions: admixtures to improve the rheological properties of concrete mixing, including ordinary water reducers, high-efficiency water reducers and air-entraining agents, pumping agents...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B103/30
CPCC04B2103/601C04B2103/302C04B18/243C04B2103/304Y02W30/91C04B20/023
Inventor 闫勇郑翠红朱伟长俞海云
Owner ANHUI UNIVERSITY OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com