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Method for identifying fly ash leading to concrete and mortar defects

A technology for fly ash and concrete, which is applied in the direction of material analysis using radiation diffraction to achieve the effect of improving accuracy and simple process

Active Publication Date: 2015-07-01
TIANJIN BUILDING MATERIAL PROD QUALITY SUPERVISION & INSPECTION CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to solve the identification problem of fly ash that can lead to concrete and mortar defects, provide a feasible technical solution for relevant quality inspection agencies to monitor this, and prevent the occurrence of engineering quality problems arising therefrom

Method used

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  • Method for identifying fly ash leading to concrete and mortar defects
  • Method for identifying fly ash leading to concrete and mortar defects
  • Method for identifying fly ash leading to concrete and mortar defects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take the fly ash raw material from the ready-mixed concrete mixing plant.

[0023] Carry out phase analysis to fly ash sample on X-ray diffractometer, obtain the X-ray diffraction spectrum figure of this sample ( figure 2 ).

[0024] Two diffraction peaks of 28.4° and 47.3° appeared in the sample X-ray diffraction spectrum at the same time, it can be considered that the sample has the potential danger of causing concrete and mortar defects. Continue to use the gas measuring instrument to measure the gas volume (V) and gas generation duration (t) per unit mass of the sample in the NaOH alkaline solution with a pH of 13. The amount of NaOH alkaline solution is 500mL, and the fly ash is added The amount is 10g. During the whole process, the indoor ambient temperature, cooling water and interlayer water temperature were kept at 20°C. The obtained V and t are 1.20mL / g and 5h respectively, both of which exceed the critical value of 0.20mL / g and 2h. It is considered that t...

Embodiment 2

[0026] Take the fly ash raw material from the ready-mixed concrete mixing plant.

[0027] Carry out phase analysis to fly ash sample on X-ray diffractometer, obtain the X-ray diffraction spectrum figure of this sample ( image 3 ). No two diffraction peaks at 28.4° and 47.3° appear in the X-ray diffraction spectrum of the sample, and the sample is considered harmless. In the actual project, the concrete mixed with the fly ash has no defects, which proves the applicability of the method.

Embodiment 3

[0029] Take fly ash raw material from dry-mixed mortar plant.

[0030] Carry out phase analysis to fly ash sample on X-ray diffractometer, obtain the X-ray diffraction spectrum figure of this sample ( Figure 4). Two diffraction peaks of 28.4° and 47.3° appeared in the sample X-ray diffraction spectrum at the same time, it can be considered that the sample has the potential danger of causing concrete and mortar defects. Continue to use the gas measuring instrument to measure the gas volume (V) and gas generation duration (t) per unit mass of the sample in the NaOH alkaline solution with a pH of 13. The amount of NaOH alkaline solution is 400mL, and the fly ash is added The amount is 10g. During the whole process, the indoor ambient temperature, cooling water and interlayer water temperature were kept at 20°C. The obtained V and t were 0.13mL / g and 3h respectively, and V did not exceed the critical value of 0.20mL / g, so the sample was considered harmless. In the actual proj...

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Abstract

The invention relates to a method for identifying fly ash leading to concrete and mortar. The method comprises the following steps of: performing phase analysis on samples in an x-ray diffractometer to obtain the x-ray diffraction curves of the samples; checking if the samples have diffraction peaks at 28.4 DEG and 47.3 DEG at the same time according to the x-ray diffraction curves of the fly ash samples; for samples which have diffraction peaks at 28.4 DEG and 47.3 DEG at the same time, testing the volume of gas generated by unit mass of fly ash and the gas generation time; comparing data obtained through the test and actual on-site use condition of the fly ash in concreter and mortar to obtain an empirical value; and when the gas is generated continuously for 2 hours, and the volume of produced gas exceeds a supercritical value of 0.20mL / g, which means that produced gas cannot be discharged out before the concrete cures, determining the fly ash sample leads to concrete and mortar defects, or determining the sample is harmless. In actual projects, the method has obvious effect of preventing the project quality problem.

Description

technical field [0001] The invention relates to a building material detection technology, in particular to a method for identifying fly ash that causes defects in concrete and mortar. Background technique [0002] Fly ash is the powder collected in the flue gas of pulverized coal in power plants. Its use in concrete can improve the performance of concrete, reduce the cost of concrete, and save resources and energy. Fly ash needs to be tested by a professional quality inspection department before it is used, and it can be used only after passing the test. National and local standards and technical regulations have made detailed technical requirements for fly ash used in concrete and mortar. and test methods. The national standard "Fly Ash Used in Cement and Concrete" stipulates the technical requirements and test methods of fly ash used in concrete and mortar, including fineness, water demand ratio, loss on ignition, water content, sulfur trioxide , free calcium oxide, stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/20
Inventor 白锡庆张鹏宇刘彤刘风东徐一飞王素段
Owner TIANJIN BUILDING MATERIAL PROD QUALITY SUPERVISION & INSPECTION CENT
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