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

Super-fine sand blended fine aggregate for pump concrete

A technology for pumping concrete and ultra-fine sand, which is applied in the field of fine aggregates, can solve the problems of idle waste of ultra-fine sand resources and the inability of ultra-fine sand to be widely used, achieve significant economic and ecological benefits, reduce over-reliance and excessive The effect of mining and protecting the ecological environment

Inactive Publication Date: 2012-07-04
WUXI QIANGSHI CONCRETE
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the characteristics of ultra-fine sand concrete deviate from those of pumped concrete, so that ultra-fine sand cannot be widely used, so that the abundant ultra-fine sand resources are idle and wasted

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Super-fine sand blended fine aggregate for pump concrete
  • Super-fine sand blended fine aggregate for pump concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix 133 parts of ultra-fine sand, 5 parts of machine-made sand, and 149 parts of natural medium sand. The limestone content of the limestone machine-made sand is 6%, and the calcium carbonate content in the stone powder is 85%. The mixed fine aggregate was compared with the separate ultra-fine sand in terms of particle size distribution, mud content and porosity. The specific data are shown in Table 1.

[0015] Table 1

[0016]

[0017] As can be seen from Table 1, the fine aggregate of the present invention has improved the particle gradation and mud content of the individual extra-fine sand, so that the particle gradation of the fine aggregate is more in line with the requirements of pumped concrete, and at the same time the original mud content exceeds the standard. The mud content of ultra-fine sand complies with the relevant provisions of JGJ52-2006 "Standards for the Quality and Inspection Methods of Sand and Stone for Ordinary Concrete".

Embodiment 2

[0019] C30 pumped concrete was prepared using the fine aggregate of the present invention. The formula of C30 pumped concrete is: water: 167 kg / m 3 , cement (PO.42.5): 305 kg / m 3 , Fly ash (Class I): 50 kg / m 3 , sand: 777 kg / m 3 , gravel (5~31.5mm): 1037 kg / m 3 , admixture GL-2S: 5.33 kg / m 3 . Put each raw material component into a forced mixer according to the required parts by weight and stir for 180 seconds to obtain C30 pumped concrete.

[0020] The "sand" item in the above formula uses the fine aggregate of the present invention, separate ultra-fine sand and conventional concrete sand (ie, medium-coarse natural sand), and the performance comparison of the prepared C30 concrete is shown in Table 2. Show. Wherein the formula of the fine aggregate of the present invention is: 133 parts of extra fine sand, 5 parts of machine-made sand, 149 parts of sand in natural sand. The limestone content of the limestone machine-made sand is 6%, and the calcium carbonate content i...

Embodiment 3

[0025] C20 pumped concrete was prepared using the fine aggregate of the present invention. The formula of C20 pumped concrete is: water: 167 kg / m 3 , cement (PO.42.5): 238 kg / m 3 , Fly ash (Class I): 45 kg / m 3 , Sand: 896 kg / m 3 , gravel (5~31.5mm): 979 kg / m 3 , Admixture GL-2S: 3.68 kg / m 3 . Put each raw material component into a forced mixer according to the required parts by weight and stir for 180 seconds to obtain C20 pumped concrete.

[0026] For the "sand" item in the above formula, the fine aggregate of the present invention and conventional concrete sand (ie, medium-coarse natural sand) are used respectively, and the cost price comparison of the prepared C20 concrete is shown in Table 3. Wherein the formula of the fine aggregate of the present invention is: 192 parts of extra fine sand, 6 parts of machine-made sand, 135 parts of sand in natural sand. The limestone content of the limestone machine-made sand is 9%, and the calcium carbonate content in the stone p...

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

No PUM Login to View More

Abstract

The invention discloses a super-fine sand blended fine aggregate for pump concrete. The super-fine sand blended fine aggregate comprises the following raw material components in part by weight: 130 to 200 parts of super-fine sand, 3 to 8 parts of limbstone artificial sand and 130 to 150 parts of middle thick natural sand, wherein the limbstone content in the limbstone artifical sand is 5 to 10 percent; and the calcium carbonate content in limestone powder is not less than 85 percent. The pump concrete prepared by the fine aggregate has the advantages of high flowability, high peaceability, small number of structural slits, high pumpability and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a fine aggregate which is used for pumping concrete and uses ultra-fine sand as a raw material. Background technique [0002] my country is rich in ultra-fine sand resources, and there are a large number of ultra-fine sand resources in the Yangtze River Basin, Jialing River system, the middle and lower reaches of the Yellow River, the Pearl River Basin and Northwest China. The strength grade of concrete prepared with extra fine sand can generally reach C40. However, due to the characteristics of high mud content, large specific surface area, and poor particle gradation of ultra-fine sand, compared with medium-sand mixed concrete, the mixed concrete has large water consumption, poor fluidity, and the poured structure is prone to cracks, etc. feature. These shortcomings make ultra-fine sand only limited to dry hard concrete engineering structures. [0003] At present,...

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): C04B14/28
Inventor 周建强陈培标
Owner WUXI QIANGSHI CONCRETE
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