Deductive method of hardened concrete mixing ratio

A concrete and mix ratio technology, applied in the field of material engineering, can solve the problems of inapplicability, inability to obtain the proportion of coarse and fine aggregate in concrete, and complicated measurement process

Inactive Publication Date: 2010-12-08
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this method needs to detect the calcium oxide content of the cement in advance, which is not applicable to the existing engineering reinforced concrete structure, because the loss on ignition of the cement used cannot be known in advance
When this method is used to estimate the mix ratio of concrete using limestone coarse aggregate, the measurement error is often large, and the measurement process needs to be measured for calcium oxide content many times, which is complicated; the concrete is directly crushed and ball-milled. Most of the powder obtained is coarse and fine aggregate powder, which not only consumes a lot of energy in the determination process, but also affects the measurement accuracy of calcium oxide content; in addition, if the ratio between aggregates is unknown in advance (and the existing concrete that needs to estimate the mix ratio The ratio of coarse and fine aggregates is generally unknown), this method cannot obtain the proportion of coarse and fine aggregates in concrete, and it is difficult to obtain the mix ratio of hardened concrete

Method used

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  • Deductive method of hardened concrete mixing ratio
  • Deductive method of hardened concrete mixing ratio
  • Deductive method of hardened concrete mixing ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0048] Embodiments 1 to 5 of the present invention adopt the following method to estimate the mix ratio of hardened concrete:

[0049] A kind of estimation method of hardened concrete mix ratio, described estimation method step is as follows:

[0050] 1. Put the hardened concrete to be tested into water and soak for 48 hours, take out the hardened concrete and wipe the surface dry to form a dry hardened concrete block at the saturated surface, and the measured quality is the dry mass of the saturated surface of the hardened concrete as G 1 ; The dry hardened concrete block on the saturated surface is heated and dried for the first time at 100-110° C. for 48 hours to obtain a concrete block in an absolutely dry state. The measured quality is the mass of the hardened concrete after absolute drying, which is calculated as G 2 The obtained concrete block in an absolutely dry state was heated at 300°C for 3 hours, and the heated concrete block was taken out and rapidly cooled to ro...

Embodiment 1

[0081] Estimation of hardened concrete mix ratio after 56 days of molding

[0082] The cement used in the experiment is PO32.5 cement produced by Qianchao Cement Factory. The maximum particle size of the limestone coarse aggregate used is 40cm. The water is drinking tap water. The sand is medium (river) sand (its fineness modulus is 2.7). Concrete was prepared according to the mix ratio shown in Table 1, and the slump of the obtained concrete mixture was 50-100mm. There were 9 concrete samples in each group, and the size of the specimen was 100mm×100mm×100mm. The concrete specimen was prepared according to the current standard method. And standard curing (the molded specimens are cured naturally for 24 hours, then removed from the formwork, and then cured in water at room temperature for 28 days); the components of each group of concrete designed are:

[0083] A1: cement / stone (coarse aggregate) / sand (fine aggregate) / water=1.00 / 2.60 / 1.46 / 0.45

[0084] A2: cement / stone (coarse...

Embodiment 2

[0100] Estimation of the mix ratio of hardened concrete after 180 days of molding

[0101] The cement, coarse aggregate, sand, water, etc. used in the experiment are the same as the above-mentioned embodiment 1; the size, preparation and curing method of the test piece are all the same as the above-mentioned embodiment 1; the components of each group of concrete designed are the same as the above-mentioned embodiment 1; after 28 days After taking it out and storing it in the indoor environment for 152 days, use 3 of the above-mentioned remaining 6 samples of each group to carry out the mixing ratio estimation test according to the accompanying drawing 1 of the specification, and the remaining 3 samples will continue to be stored indoors for use.

[0102] Table 3 shows the mean values ​​of the measurement results and the calculation process of the three samples in each group after 180 days of molding.

[0103] Table 3 The mean value of the measurement results of each group of 3...

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Abstract

The invention relates to a deductive method of hardened concrete mixing ratio, comprising the following steps of: measuring the saturated surface dry mass of a concrete block, measuring the mass of the concrete block after drying; breaking the concrete into a plurality of small blocks, quickly cooling the small concrete blocks after heating, crushing the small concrete blocks for the first time, screening the crushed material, measuring the dry mass of the unscreened part; measuring the dry mass of the screened part; crushing the dry material of the screened part for the second time to form atest sample; weighing the dried test sample; weighing the powder mass after calcination and obtaining the ignition loss of the powder sample by calculation, weighing the dried test sample, adding hydrochloric acid into the sample, filtering the mixture after stirring, calcining the residue, weighing the powder mass after calcination, obtaining the mass of undissolved substances in the powder by calculation; and calculating the mixing ratio according to formula. The method has the advantages of short operation time, low energy consumption and high precision.

Description

(1) Technical field [0001] The invention relates to a method for estimating the mixing ratio of hardened concrete, which belongs to the field of material engineering. (2) Background technology [0002] In water conservancy and marine concrete engineering, the concrete mix ratio and its construction quality are one of the most important factors that determine the durability and service life of reinforced concrete structures. However, the mix ratio of some existing hardened concrete is often different from the designed mix ratio during the construction process. The estimation of the mix ratio of hardened concrete can be used as a reference for evaluating the permeability of hardened concrete. It is one of the means and also the method needed in the practice of engineering quality inspection. [0003] When evaluating the durability of concrete and predicting its life, it is usually necessary to carry out relevant simulation experiments on the existing concrete structure, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04G01N1/28G01N1/34G01N1/44G01N1/42G01N31/12
Inventor 张俊芝王建泽孔德玉周建民
Owner ZHEJIANG UNIV OF TECH
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