Determination method for restrained expansion rate and expansion rate of expansive concrete from plasticity to hardening

A technology that expands concrete and restricts expansion. It is applied in the field of concrete detection. It can solve the problems that the hydration characteristics of the expansion agent cannot be fully reflected, the expansion rate of the expansion agent cannot be evaluated, and the crack resistance of concrete cannot be well reflected. It achieves high work efficiency, The effect of eliminating restrictive effects and good crack resistance

Inactive Publication Date: 2015-05-13
武汉三源特种建材有限责任公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the expansion agent detection method is relatively simple, that is, the expansion rate of the demolition test after the mortar strength reaches 10±2MPa and the expansion rate of the concrete strength after the formwork removal test reaches 3-5MPa. Its role is more biased towards the homogeneity of the expansion agent. It can better reflect the anti-crack performance of the expansion agent on the concrete, and it is impossible to evaluate the expansion rate of the expansion agent before the formwork is removed
Nowadays, the expansion rate after demoulding is often used to measure the quality of the expansion agent, which cannot fully reflect the hydration characteristics of the expansion agent.

Method used

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  • Determination method for restrained expansion rate and expansion rate of expansive concrete from plasticity to hardening
  • Determination method for restrained expansion rate and expansion rate of expansive concrete from plasticity to hardening
  • Determination method for restrained expansion rate and expansion rate of expansive concrete from plasticity to hardening

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Embodiment 1

[0029] Embodiment 1, is a basic example. A method for determining the limiting expansion rate and expansion rate of expansive concrete from plasticity to hardening, such as figure 1 shown, including the following steps:

[0030] A. Blending expansion agent: the expansion agent is 20-50Kg / m 3 The dosage is mixed into the concrete with the strength grade of C20-C50, and stirred evenly;

[0031] B. Measurement: Put the mixture in step A into the plastic limited expansion tester, and cover with a wet rag to start detection. The detection frequency during data collection is to collect a data every 2-5 minutes; 2-5 hours after the concrete is formed Inside, take out the thin plates 9 on both sides of the plastic limited expansion rate tester, eliminate the friction between the two sides of the concrete and the mold 4, and obtain the limited expansion rate from plasticity to hardening by automatically reading the displacement change;

[0032] C. Data processing: the limited expa...

Embodiment 2

[0040] Embodiment 2, is a preferred embodiment. In the method for determining the expansion rate and expansion rate of expansive concrete from plasticity to hardening, the data collection starts when the concrete is molded for molding and ends when the concrete hardens. Expansion rate. The dosage of expansion agent is 35kg / m 3 . The concrete strength grade is C35. The detection frequency is collected once every 2 minutes. Within 4 hours after the concrete is formed, take out the thin plates 9 on both sides of the plastic limited expansion rate tester, eliminate the friction between the two sides of the concrete and the mold 4, and obtain the limited expansion rate from plasticity to hardening by automatically reading the displacement change.

Embodiment 3

[0041] Embodiment 3, is another preferred embodiment. In this example, the mixed expansion agent is two commercially available expansion agents (expansion agent 1 and expansion agent 2), the amount of which is 35kg / m 3, the concrete strength grade is C35, and the concrete mix ratio is shown in Table 1. The addition method is to mix with the cementitious material, expansion agent, coarse and fine aggregate first, and then add water and water reducing agent. The mixing time is 150 seconds, and the concrete slump is controlled at 190±20mm. After the mixing is completed, put the concrete mixed with the expansion agent into the mold 4, vibrate and form it, cover it with a wet rag, connect the sensor 6 and the digital acquisition instrument 1 to start detection, and collect a data every 2 minutes, about 4 hours without affecting the normality of the data Take out the thin plates 9 on both sides of the mold 4 in the case of collection, and the data processing time is calculated fr...

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Abstract

The invention relates to a determination method for restrained expansion rate and expansion rate of expansive concrete from plasticity to hardening. The determination method comprises the steps of mixing an expansive agent, determining and processing data. Special equipment for the determining and data processing is plasticity restrained expansion rate determinator which comprises a data acquisition device, a mould, an expansion rod, a sensor, a target and a sheet. The determination method provided by the invention has the advantages that the entire process of determining the expansive concrete from no expansion rate to the end of expansion reflects hydration characteristics of the expansive agent and a matching relation between the expansive agent and the strength development of the concrete, thus providing data support for the development of expansion agent products. A restrained expansion rate curve and an expansion rate curve of the expansive concrete from plasticity to hardening are completed through the special equipment of the plasticity restrained expansion rate determinator, the determination data is accurate and intuitive, and the working efficiency is high.

Description

technical field [0001] The invention relates to the limited expansion rate of concrete from plasticity to hardening and a method for measuring the expansion rate, which is the detection of the limited expansion rate of expansive concrete and belongs to the technical field of concrete detection. Background technique [0002] Concrete is a very important civil engineering material at present, and concrete has the inherent characteristics of shrinkage, and the phenomenon of cracking caused by shrinkage is not uncommon. Concrete expansion agent is an anti-crack and anti-seepage admixture widely used in China, which plays a positive role in improving the quality of concrete buildings. Therefore, a testing method for the expansion agent performance came into being. The limited expansion rate of concrete is an essential test method for the detection of expansion agents, and its measurement method directly affects the performance of the expansion agent. [0003] At present, the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38
Inventor 吴翠娥凡涛涛王力
Owner 武汉三源特种建材有限责任公司
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