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Quantitative concrete workability testing device and method

A testing device, concrete technology, applied in the direction of measuring devices, flow characteristics, instruments, etc., can solve the problems of quantitative characterization and workability of testing methods, and achieve the effect of rapid and accurate measurement

Inactive Publication Date: 2016-10-12
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing testing methods cannot quantitatively characterize the workability, the present invention provides a testing device with scientific and reliable testing principle, simple operation, and the ability to quantitatively test the workability of concrete

Method used

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  • Quantitative concrete workability testing device and method
  • Quantitative concrete workability testing device and method
  • Quantitative concrete workability testing device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using Onoda PII52.5 cement, ISO standard sand, commercially available polycarboxylate superplasticizer The solid content is 20%, and the mortar is prepared according to the ratio shown in the table below, and the fluidity and workability are tested. In addition, hydroxypropyl methyl cellulose ether (HPMC) is used as a workability adjustment commonly used in the field of concrete technology The agent is applied in the mortar to adjust the workability of the mortar. Table 1 lists the fluidity and workability description of the corresponding proportion mortar.

[0033] Table 1 mortar ratio

[0034]

[0035]A mold with an inner diameter of 48 mm and a length of 350 mm is used for the workability test. The distance between the eccentric axis of the chuck and the horizontal axis is 6 mm, and the chuck is fixed at the center of the mold. The test steps are as follows:

[0036] (1) Put the empty mold into the chuck and make it vertical, loosen the mold to make it rotate ...

Embodiment 2

[0045] Use Onoda PII52.5 cement, 5-25mm continuous graded limestone gravel, medium sand with a fineness modulus of 2.6, first-class fly ash that meets the national standard, S95 finely ground slag powder, commercially available polycarboxylate Acid superplasticizer (solid content 20%), prepare ordinary C30 concrete pumping concrete. Pumping concrete with different workability was prepared by changing the amount of admixture and using workability modifier hydroxypropyl methylcellulose ether (HPMC). Concrete mix ratio and fresh performance are shown in the table below:

[0046] Table 3 Concrete mix ratio (kg)

[0047] cement

[0048] Table 4 Properties of Fresh Concrete

[0049]

[0050]

[0051] A mold with an inner diameter of 95mm and a length of 695mm is used for the concrete workability test. The distance between the eccentric axis of the chuck and the horizontal axis is 23mm, and the fixed position of the chuck is 10mm from the center of the mold. The ...

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Abstract

The invention discloses a concrete workability quantitative testing device and testing method. The test device of the present invention is composed of a bracket, a dial, a pointer, a chuck, and a detachable sealed cylinder mold, wherein a bearing seat is installed on the bracket, an eccentric shaft is arranged on the chuck, and the dial is fixed on the bracket; The eccentric shaft and the support form a rotational connection through bearings, the pointer is fixedly connected to the eccentric shaft of the chuck, the detachable sealed cylinder mold is fixed by fastening bolts on the chuck, and the detachable sealed cylinder mold is connected to the eccentric shaft of the chuck. The chuck and the pointer rotate synchronously. The test device and test method of the invention can realize fast and accurate measurement of the workability of fresh concrete, thereby guiding the construction of pumped concrete, and the invention can also be used for evaluating the influence of admixtures on the workability of concrete.

Description

technical field [0001] The invention relates to a test device and a test method, in particular to a quantitative test device and a test method for the workability of concrete. Background technique [0002] Pumping construction has become a widely used technique in concrete construction. It has the characteristics of fast construction speed, good quality, labor saving and convenient construction, so it is widely used in construction projects. The workability of fresh concrete is an important technical index related to the construction efficiency of pumped concrete, including three technical performances of fluidity, cohesion and water retention. Fluidity refers to the ability of fresh concrete to flow and fill the formwork evenly and densely under the action of its own weight or mechanical vibration. Fluidity reflects the consistency of the mixture. If the concrete mixture is too dry and thick, the fluidity will be poor and it will be difficult to vibrate compactly; if the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
CPCG01N11/00
Inventor 张建纲黄振杨勇冉千平曹攀攀毛永琳
Owner JIANGSU SOBUTE NEW MATERIALS
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