CN111141636A - Method for measuring content of aged mortar on surface of recycled coarse aggregate - Google Patents
Method for measuring content of aged mortar on surface of recycled coarse aggregate Download PDFInfo
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- CN111141636A CN111141636A CN202010034672.XA CN202010034672A CN111141636A CN 111141636 A CN111141636 A CN 111141636A CN 202010034672 A CN202010034672 A CN 202010034672A CN 111141636 A CN111141636 A CN 111141636A
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- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to a method for measuring the content of aged mortar on the surface of a regenerated coarse aggregate, which comprises the following steps: taking representative regenerated coarse aggregate, randomly extracting one part of the representative regenerated coarse aggregate, separating part of pure original natural coarse aggregate and surface aged mortar by cutting or hammering and other modes, respectively grinding the raw natural coarse aggregate and the surface aged mortar to certain fineness, drying the raw natural coarse aggregate and the surface aged mortar to constant weight, burning the raw natural coarse aggregate at high temperature, weighing the mass of the residue, repeating the method, measuring the mass of the residue after the high-temperature burning of the regenerated coarse aggregate, and calculating the content of the surface aged mortar of the regenerated coarse aggregate through a linear equation of two elements. The method can realize quantitative analysis of the surface aged sand well of the recycled aggregate, and has good guiding significance for researching the performance of the recycled coarse aggregate and the recycled concrete prepared by the recycled coarse aggregate.
Description
Technical Field
The invention relates to a method for measuring the content of aged mortar on the surface of a regenerated coarse aggregate.
Background
With the increasing of environment protection supervision and the exhaustion of natural sandstone aggregate resources, recycled aggregates gradually enter the market for preparing concrete. The recycled coarse aggregate has characteristics of high water absorption, large crushing value, poor firmness and the like due to the surface aged mortar, and generally, the performance thereof is worse and the adverse effect on concrete is larger as the content of the surface aged mortar is increased. Therefore, it is necessary to measure the content of the aged mortar on the surface of the recycled coarse aggregate by a certain means so as to guide the application of the recycled coarse aggregate.
Chinese patent CN 103335911 a discloses a method for determining the content of mortar on the surface of limestone recycled aggregate, but it is only suitable for determining the content of mortar on the surface of limestone recycled aggregate. The method for measuring the aged mortar content on the surface of the recycled coarse aggregate overcomes the defect that the method is only suitable for measuring the mortar content on the surface of the limestone recycled aggregate, and has wider application range.
Disclosure of Invention
The invention aims to provide a method for measuring the surface aging mortar content of a recycled coarse aggregate, which can realize the measurement of the surface aging mortar content in the recycled coarse aggregate, provide a basis for researching the influence of the surface aging mortar content of the recycled coarse aggregate on the performance of recycled concrete, and provide a guide for the application of the recycled coarse aggregate so as to ensure the engineering quality.
The invention provides a method for determining the content of aged mortar on the surface of a regenerated coarse aggregate, which comprises the following steps:
(1) taking representative concrete recycled coarse aggregate of not less than 24kg, drying to constant weight, cooling to room temperature, fully and uniformly stirring, and dividing into two parts by adopting a quartering method, wherein the two parts have equal mass, and each part has not less than 3 kg;
(2) randomly selecting one part of dried regenerated coarse aggregate obtained in the step (1), extracting one part of regenerated coarse aggregate, and obtaining pure original natural coarse aggregate and surface aged mortar in modes of cutting or hammering and the like, wherein the mass of each part is not less than 200 g;
(3) grinding the raw natural coarse aggregate obtained in the step (2) until the particles can completely pass through a 0.075mm square-hole sieve, and weighing the mass of the raw natural coarse aggregate as M1；
(4) The ground mass obtained in the step (3) is M1Burning the original natural coarse aggregate powder at 860 +/-40 ℃ for 20-30 min to obtain a residue;
(5) putting the residue obtained in the step (4) into a drying dish, cooling to room temperature, and weighing the mass M of the residue11；
(6) Respectively adopting the same methods of the steps (3) to (5) to the surface aging mortar obtained in the step (2) and the other part of the recycled coarse aggregate which is not subjected to the step (2) and is obtained in the step (1), wherein the mass of the surface aging mortar and the mass of the recycled coarse aggregate powder after grinding are respectively M2And M3The mass of the ignition residue is M22And M33；
(7) The following calculation is used:
ignition loss W of original natural coarse aggregate1=（M1﹣M11）÷M1×100%;
Surface aging mortar ignition loss W2=（M2﹣M22）÷M2×100%;
(8) Assuming the recycled coarse aggregate powder M3The mass of the original natural coarse aggregate and the surface aged mortar are respectively MGAnd MSThen, a linear equation of two can be obtained:
MG+MS= M3；
MG×W1+MS×W2=M3﹣M33；
(9) the recycled coarse aggregate M can be obtained by the step (8)3Quality of the middle surface aged mortar:
MS=（M1M2M33﹣M11M2M3）÷（M1M22﹣M11M2）；
(10) through the step (9), the content of the recycled coarse aggregate surface aged mortar can be obtained:
WS=MS÷M3=（M1M2M33﹣M11M2M3）÷（M1M22M3﹣M11M2M3）×100%。
in the invention, the primary coarse aggregate wrapped by the surface aging mortar in the representative concrete recycled coarse aggregate in the step (1) is pebbles, broken stones or a mixture of the pebbles and the broken stones.
The invention has the beneficial effects that:
the method for determining the surface aging mortar content of the recycled coarse aggregate can determine the surface aging mortar content of the recycled coarse aggregate, provides a basis for researching the influence of the surface aging mortar content of the recycled coarse aggregate on the performance of recycled concrete, and also provides a guide for the application of the recycled coarse aggregate.
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The invention is further illustrated by the following figures and examples.
FIG. 1 is a flow chart of a method for determining the content of the aged mortar on the surface of the recycled coarse aggregate.
Detailed Description
The invention is further illustrated by the following figures and examples. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Example 1, the method for determining the content of the aged mortar on the surface of the recycled coarse aggregate comprises the following steps: taking a representative sample from recycled coarse aggregate prepared from a waste concrete sample, drying the sample in a drying oven at 105 +/-5 ℃ to constant weight, cooling to room temperature, fully and uniformly stirring, and taking two parts with approximately equal mass by adopting a quartering method; randomly selecting one part of recycled coarse aggregate dried to constant weight, extracting one part of particles, separating out part of pure crushed original natural coarse aggregate and surface aged mortar in a hammering mode, and then respectively grinding the separated original natural coarse aggregate, surface aged mortar and the other part of recycled coarse aggregate until the particles of the separated original natural coarse aggregate, surface aged mortar and the other part of recycled coarse aggregate can completely pass through a 0.075mm square-hole sieve to obtain 200.35g (M) of original natural coarse aggregate, surface aged mortar and recycled coarse aggregate powder respectively1）、200.21g（M2) And 3015.64g (M)3) Then placing in muffle furnace, respectively, igniting at 860 + -40 deg.C for 25min to obtain ignition residue, placing in drying dish, respectively, cooling to room temperature, and weighing 173.76g (M)11）、189.87g（M22) And 2663.21g (M)33) And then, the content of the regenerated coarse aggregate surface aged mortar is as follows: wS=（M1M2M33﹣M11M2M3）÷（M1M22M3﹣M11M2M3）×100% =（200.35×200.21×2663.21﹣173.76×200.21×3015.64）÷（200.35×189.87×3015.64﹣173.76×200.21×3015.64）×100%=21.36%。
Compared with the conventional method for measuring the surface aging mortar of the recycled coarse aggregate, the method disclosed by the invention is easier to operate and implement, is simple and convenient, has lower requirements on test equipment, can be realized in a conventional concrete laboratory, has more accurate measured data, overcomes the problem of narrow application range of the conventional method, and has higher universality and popularization value.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents.
Claims (2)
1. A method for measuring the content of aged mortar on the surface of a regenerated coarse aggregate is characterized by comprising the following steps:
(1) taking representative concrete recycled coarse aggregate of not less than 24kg, drying to constant weight, cooling to room temperature, fully and uniformly stirring, and dividing into two parts by adopting a quartering method, wherein the two parts have equal mass, and each part has not less than 3 kg;
(2) randomly selecting one part of dried regenerated coarse aggregate obtained in the step (1), extracting one part of regenerated coarse aggregate, and obtaining pure original natural coarse aggregate and surface aged mortar in modes of cutting or hammering and the like, wherein the mass of each part is not less than 200 g;
(3) grinding the raw natural coarse aggregate obtained in the step (2) until the particles can completely pass through a 0.075mm square-hole sieve, and weighing the mass of the raw natural coarse aggregate as M1；
(4) The ground mass obtained in the step (3) is M1Burning the original natural coarse aggregate powder at 860 +/-40 ℃ for 20-30 min to obtain a residue;
(5) putting the residue obtained in the step (4) into a drying dish, cooling to room temperature, and weighing the mass M of the residue11；
(6) Respectively adopting the same methods of the steps (3) to (5) to the surface aging mortar obtained in the step (2) and the other part of the recycled coarse aggregate which is not subjected to the step (2) and is obtained in the step (1), wherein the mass of the surface aging mortar and the mass of the recycled coarse aggregate powder after grinding are respectively M2And M3The mass of the ignition residue is M22And M33；
(7) The following calculation is used:
ignition loss W of original natural coarse aggregate1=（M1﹣M11）÷M1×100%;
Surface aging mortar ignition loss W2=（M2﹣M22）÷M2×100%;
(8) Suppose to beThe recycled coarse aggregate powder M3The mass of the original natural coarse aggregate and the surface aged mortar are respectively MGAnd MSThen, a linear equation of two can be obtained:
MG+MS= M3；
MG×W1+MS×W2=M3﹣M33；
(9) the recycled coarse aggregate M can be obtained by the step (8)3Quality of the middle surface aged mortar:
MS=（M1M2M33﹣M11M2M3）÷（M1M22﹣M11M2）；
(10) through the step (9), the content of the recycled coarse aggregate surface aged mortar can be obtained:
WS=MS÷M3=（M1M2M33﹣M11M2M3）÷（M1M22M3﹣M11M2M3）×100%。
2. the method according to claim 1, wherein the primary coarse aggregate coated with the surface-aged mortar in the representative concrete recycled coarse aggregate of the step (1) is pebbles, crushed stones or a mixture of the pebbles and the crushed stones.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539499A (en) * | 2009-04-23 | 2009-09-23 | 浙江工业大学 | Deductive method of hardened concrete mixing ratio |
| CN103335911A (en) * | 2013-06-03 | 2013-10-02 | 广西大学 | Method for determining content of mortar of surfaces of limestone recycled aggregates |
| CN104634692A (en) * | 2014-09-17 | 2015-05-20 | 四川鑫统领建材科技有限公司 | Method for determining cement content of building mortar |
| KR20160069278A (en) * | 2014-12-08 | 2016-06-16 | 홍익대학교세종캠퍼스산학협력단 | Method for determining mortar content of recycled concrete aggregate sample |
| CN108489848A (en) * | 2018-05-30 | 2018-09-04 | 陕西省交通建设集团公司 | The rapid detection method of brick content in a kind of regenerated coarse aggregate |
-
2020
- 2020-01-14 CN CN202010034672.XA patent/CN111141636A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539499A (en) * | 2009-04-23 | 2009-09-23 | 浙江工业大学 | Deductive method of hardened concrete mixing ratio |
| CN103335911A (en) * | 2013-06-03 | 2013-10-02 | 广西大学 | Method for determining content of mortar of surfaces of limestone recycled aggregates |
| CN104634692A (en) * | 2014-09-17 | 2015-05-20 | 四川鑫统领建材科技有限公司 | Method for determining cement content of building mortar |
| KR20160069278A (en) * | 2014-12-08 | 2016-06-16 | 홍익대학교세종캠퍼스산학협력단 | Method for determining mortar content of recycled concrete aggregate sample |
| CN108489848A (en) * | 2018-05-30 | 2018-09-04 | 陕西省交通建设集团公司 | The rapid detection method of brick content in a kind of regenerated coarse aggregate |
Non-Patent Citations (1)
| Title |
|---|
| 李倩倩等: "再生粗骨料砂浆含量测定方法及骨料提升技术研究", 《硅酸盐通报》 * |
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Application publication date: 20200512 |