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

Concrete setting time test method based on aggregate equal specific surface area substitution principle

A specific surface area and test method technology, applied in the direction of analyzing materials, flow characteristics, measuring devices, etc., can solve problems that affect the accuracy of setting time, unevenness of mortar, difficulty in screening out mortar, etc., to ensure test accuracy, The repeatability test deviation is small, and the effect of reducing the test deviation

Active Publication Date: 2017-03-08
云南建投绿色高性能混凝土股份有限公司
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is not only time-consuming and laborious in the test operation, especially for concrete with a small slump, it is difficult to sieve the mortar from the mixture; moreover, the inhomogeneity of the sieved mortar affects the accuracy of the determination of the setting time

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
  • Concrete setting time test method based on aggregate equal specific surface area substitution principle
  • Concrete setting time test method based on aggregate equal specific surface area substitution principle
  • Concrete setting time test method based on aggregate equal specific surface area substitution principle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Select the C30 underwater super retarded concrete production formula of a production mixing station of our company. According to the concrete quality per cubic meter, 1034kg of gravel, 719kg of mixed sand mixed with mountain sand and machine-made sand at a ratio of 1:4, 277kg of cement, and Class II pulverized coal 92kg of ash, 92kg of S75 slag powder, 185kg of water, 9.7kg of naphthalene-based water reducer, and 1.32kg of sodium gluconate. Follow the steps below to determine the setting time of concrete:

[0040] (1) Gradation of concrete sand and gravel particles actually used in the test project and calculation of the specific surface area SS of the sand and gravel g and SS s ,Methods as below:

[0041] ①Measure the sieve residue on each sieve of concrete sand and gravel according to JGJ 52 of "Sand and Stone Quality and Inspection Method Standard for Ordinary Concrete", accurate to 0.1%;

[0042] The screening test results of gravel and mixed sand used in the C30...

Embodiment 2

[0073] Select C10, C20 and C40 underwater ultra-retarded concrete production formulas from three production mixing stations of our company, and follow the steps of this method to measure the setting time of concrete. The determined mortar mix ratio is shown in Table 3, and the setting time test results are shown in Table 4.

[0074] Table 2 concrete mix ratio

[0075]

[0076] Table 3 Mortar mix ratio calculated and determined by using aggregate equal specific surface area substitution principle

[0077]

[0078] Table 4 coagulation time test results

[0079]

[0080] By adopting the method of the present invention to carry out the example verification of the production formula of C10, C20 and C40 underwater super-retarded concrete produced by our company, the test result of the method of the present invention is compared with the test result of the national standard method, and the deviation of the setting time of the two is less than 5 %, good consistency.

[008...

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
Login to View More

Abstract

A concrete setting time testing method based on a principle of aggregate equal specific surface area substitution. The method comprises the following steps: 1) testing the grain composition of the concrete sandstone actually used in engineering and calculating the specific surface area SSs of sand and the specific surface area SSg of stone; 2) converting the weight of the stone into the weight of sand Ms according to the principle of equal specific surface area substitution, and calculating the total weight of sand Ms; 3) calculating the mortar mix ratio; and 4) mixing the mortar according to a mortar mixing method in the Standard for test method of basic properties of construction mortar JGJ / T70, and testing the setting time of mortar by a penetration-obstruction method according to the Standard for test method of performance on ordinary fresh concrete GB / T 50080. The method of the invention effectively solves the problem of inhomogeneity and time and labor consumption of mortar sieved from concrete mixture according to the national standard, improves work efficiency and ensures the consistency of mortar aggregate specific surface area and concrete aggregate specific surface area; and test result of the setting time by the method has a deviation of 5% from the national standard method, and has good consistency.

Description

technical field [0001] The invention relates to the technical field of concrete preparation. Background technique [0002] Concrete needs an appropriate setting time during construction, and the initial setting time is an important index to characterize the performance development of poured concrete. For example, in the process of integral layered continuous pouring or push-type continuous pouring of mass concrete, the second layer of concrete should be poured before the initial setting of the front layer of concrete; The pipe drilling rig is used for drilling and cutting. The piles are generally arranged in the form of a plain pile and a reinforced pile. The concrete of the plain pile is super-retarded concrete. It is required that the construction of the reinforced pile must be completed before the initial setting of the plain pile concrete. Therefore, it is of great significance to accurately determine the setting time of fresh concrete to control the quality of concrete...

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): G01N11/10
Inventor 李章建李世华梁丽敏李翔马敏超赵彦王剑非王晓燕林培仁田帅王模弼何云陈华民曹蓉曹宝李海
Owner 云南建投绿色高性能混凝土股份有限公司
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