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The method of pushing back the original mix ratio of hardened concrete at early age

A concrete and early-age technology, which is applied in the pushback field of the original mix ratio of concrete, can solve problems such as poor test accuracy

Inactive Publication Date: 2016-01-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the poor test accuracy of the existing pushback method for the original mix ratio of hardened concrete, and provides a pushback method for the original mix ratio of hardened concrete at an early age

Method used

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  • The method of pushing back the original mix ratio of hardened concrete at early age
  • The method of pushing back the original mix ratio of hardened concrete at early age
  • The method of pushing back the original mix ratio of hardened concrete at early age

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Experimental program
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specific Embodiment approach 1

[0019] Specific implementation mode one: the push-back method of the original mix ratio of early age hardened concrete in this implementation mode is carried out according to the following steps:

[0020] Step 1: Take a concrete test block to be tested, and measure the mass m of the concrete test block in the air under the water-absorbed and dry state 1 , and then soak the concrete test block in water for 24h, and measure the mass m 2 , and then dry the concrete test block at 100-105°C to constant weight, and measure the mass m 3 , to calculate the bulk density of concrete in the dry state where ρ 水 is the density of water;

[0021] Step 2: Take another concrete test block to be tested and break it into 30-50mm fragments and dry it to constant weight to obtain concrete fragments, and weigh the mass as M 0 The concrete fragments are packed into acid-resistant plastic containers and poured into a mass of M 0 Dilute hydrochloric acid solution A with 2 to 3 times the volume ...

specific Embodiment approach 2

[0027] Embodiment 2: This embodiment differs from Embodiment 1 in that the dilute hydrochloric acid solution A in step 2 is prepared by mixing 11.6 mol / L concentrated hydrochloric acid and water at a mass ratio of 1:3-6. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the acid-resistant plastic container described in Step 2 and Step 3 is a polyethylene plastic container. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for backcasting an original mixing ratio of early-age hardened concrete, relating to a method for backcasting an original mixing ratio of concrete and aiming to solve the problems of relatively poor test precision and relatively complex process existing in the traditional method for backcasting an original mixing ratio of hardened concrete. The method comprises the steps of calculating the volume density of concrete in an absolute dry condition; crushing a concrete test block, and adding a diluted hydrochloric acid solution to soak the crushed block to obtain a slurry matter; screening mixed slurry, flushing particulate matters on a square-opening sieve with water, and collecting slurry; calculating the mass of coal ash in the whole test block; calculating the content of chemical bound water of cement in the dry concrete; and calculating the dosage of coarse aggregates G, fine aggregates S, cement C, coal ash or any other pozzolanic materials FA in every cubic meter of concrete to be tested. The method is used for the field of building material detection.

Description

technical field [0001] The invention relates to a method for pushing back the original mix ratio of concrete. Background technique [0002] Concrete is one of the most widely used building materials at home and abroad, and its basic raw materials are cementitious materials, sand, stones and water. In actual engineering, due to factors such as unreasonable design of mix ratio, wrong weighing of raw materials, improper selection of material types, and frequent material suppliers deliberately cutting corners and other factors, the strength of many engineering concretes obviously fails to meet the design requirements during acceptance, and even some Safety accidents such as collapses occurred in construction projects. For such engineering cases, it is first necessary to determine the original mix ratio of the hardened concrete in the project, that is, the amount or proportion of the main raw materials in the concrete, in order to provide basic data for determining the accident ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04
Inventor 高小建刘春英叶焕
Owner HARBIN INST OF TECH
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