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

A cement concrete water reducing agent suitable for machine-made sand

A technology of cement concrete and water reducer, which is applied in the field of cement concrete water reducer, which can solve the problems of large flow resistance and roughness of fresh concrete, and reduced service life and durability of cement concrete, so as to be suitable for long-term storage and reduce flow Resistance, effect of improving fluidity

Inactive Publication Date: 2018-03-30
UNIV OF JINAN
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shortage of natural sand resources, machine-made sand is generally used in construction engineering concrete to gradually replace natural sand or mixed sand. However, there are significant differences between machine-made sand and natural sand in terms of grain shape, gradation, surface texture, and stone powder content below 0.075 mm.
The rough surface characteristics of machine-made sand particles make the flow resistance of freshly mixed concrete large. To achieve the same fluidity, a large water-cement ratio is required, and the existence of fine stone powder will also absorb more water, which will eventually lead to an increase in the water consumption of machine-made sand concrete. Big
Therefore, the application of machine-made sand in concrete is strictly limited due to the fact that the particle shape, gradation, surface texture and the presence of stone powder have a great influence on the fluidity of concrete.
Due to the differences in the shape, gradation, surface texture and stone powder of the machine-made sand, the volume compatibility between concrete and the current commercially available water-reducing agents will inevitably occur, resulting in a decrease in the water-reducing rate of the water-reducing agent and shortening the service life of cement concrete. and reduced durability

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

Embodiment 1

[0012] A concrete water reducer suitable for machine-made sand, consisting of the following components in parts by weight: 60 parts of carboxylated styrene-butadiene rubber powder, 14 parts of fatty acid potassium soap, 10 parts of potato starch, and 18 parts of sodium hydroxide solution with a mass concentration of 15% parts, stir to mix evenly. The particle size of carboxylated styrene-butadiene rubber powder is 0.05μm~1.15μm, the bulk density is 400g / L~600g / L, and the minimum film-forming temperature is 0℃.

[0013] The mixing amount is 1.5% of the cement mass in the concrete to achieve the same slump (180mm), the water reducing efficiency is 25%, and the 28-day compressive strength is 40.5MPa.

Embodiment 2

[0015] A concrete water-reducing agent suitable for machine-made sand, consisting of the following components in parts by weight: 40 parts of carboxylated styrene-butadiene rubber powder, 10 parts of fatty acid potassium soap, 25 parts of cornstarch, and 40 parts of sodium hydroxide solution with a mass concentration of 10%. parts, stir to mix evenly. The particle size of carboxylated styrene-butadiene rubber powder is 0.05μm~1.15μm, the bulk density is 400g / L~600g / L, and the minimum film-forming temperature is 0℃.

[0016] The mixing amount is 1.5% of the cement mass in the concrete to achieve the same slump (180mm), the water reducing efficiency is 28%, and the 28-day compressive strength is 39.7MPa.

Embodiment 3

[0018] A concrete water reducer suitable for machine-made sand, which consists of the following components in parts by weight: 15 parts of carboxylated styrene-butadiene rubber powder, 20 parts of fatty acid potassium soap, 10 parts of corn starch, 20 parts of potato starch, and a mass concentration of 20% 10 parts of sodium hydroxide solution, stirred and mixed evenly. The particle size of carboxylated styrene-butadiene rubber powder is 0.05μm~1.15μm, the bulk density is 400g / L~600g / L, and the minimum film-forming temperature is 0℃.

[0019] The mixing amount is 1.5% of the cement mass in the concrete to achieve the same slump (180mm), the water reducing efficiency is 22%, and the 28-day compressive strength is 41.4MPa.

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
particle diameteraaaaaaaaaa
minimum film forming temperatureaaaaaaaaaa
compressive strengthaaaaaaaaaa
Login to View More

Abstract

Belonging to the technical field of environmental protection building materials, the invention in particular relates to a cement concrete water reducing agent suitable for machine-made sand. According to a technical scheme, the cement concrete water reducing agent suitable for machine-made sand is composed of the following components by weight: 8-60 parts of carboxylated styrene butadiene rubber powder, 5-20 parts of potassium aliphatate soap, 10-30 parts of starch, and 10-40 parts of a sodium hydroxide solution. The water reducing agent provided by the invention has very good volume compatibility with machine-made sand, can effectively ensure dispersion of the water reducing agent in concrete, has high water reducing rate and good fluidity, and can obviously improve the fluidity and workability of cement concrete for machine-made sand.

Description

technical field [0001] The invention belongs to the technical field of environmental protection building materials, and in particular relates to a cement concrete water reducer suitable for machine-made sand. technical background [0002] In recent years, high-performance concrete has played an important role in my country's engineering construction. With the rapid development of infrastructure, there has been a shortage of natural sand in many areas, and the supply of high-quality natural sand in the country has gradually decreased. Sand in major cities across the country The contradiction between supply and demand of stone is particularly prominent. Due to the shortage of natural sand resources, machine-made sand is generally used in construction engineering concrete to gradually replace natural sand or mixed sand. However, there are significant differences between machine-made sand and natural sand in terms of grain shape, gradation, surface texture, and stone powder conte...

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 Patents(China)
IPC IPC(8): C04B24/38C04B103/30C04B14/06
CPCC04B14/06C04B40/0039C04B2103/302C04B24/2676C04B24/085C04B24/38C04B22/062C04B28/00
Inventor 宫晨琛孙科科芦令超王守德赵丕琪程新
Owner UNIV OF JINAN
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