CN1737496A

CN1737496A - Method for measure effective pore diameter of greening concrete

Info

Publication number: CN1737496A
Application number: CN 200510017116
Authority: CN
Inventors: 董建伟; 娄军海; 白国庆; 王宪国; 王晖; 张丽梅
Original assignee: JILIN ACADEMY OF WATER RESOURCES
Current assignee: JILIN ACADEMY OF WATER RESOURCES
Priority date: 2005-09-08
Filing date: 2005-09-08
Publication date: 2006-02-22

Abstract

This invention discloses one test method of greening concrete effect hole radium which comprises the following steps: using certain quantity and radium standard to evenly spread on the test parts; after vibrating for a while, detecting the standard sand ability of passing the part by the percentage of the weight of standard sand on the total sand; then detecting the planting and growing ability of the concrete to extend and multiply of the plant to strengthen the adherent force of the plate surface.

Description

The detection method of green concrete effective aperture

Technical field

The invention discloses the detection method of a kind of green concrete effective aperture, refer to a kind of especially being fit to the plant root growth requirement in the green concrete and connecting the detection method in the maximum equivalent aperture of hole again mutually.

Background technology

As everyone knows, green concrete is a kind of concrete that can grow grass, be to transform material by nutrition of filling special plant and saline alkali in the non-fine concrete of certain particle diameter aggregate to make, when foreign study is made green concrete, with the concrete pore rate is 20～30% as weighing the index that can plant grow, and this method also copied mechanically by domestic a lot of units; Yet actual showing, when aggregate size hour, porosity and aggregate size are more or less the same when big, but plant germination on the green concrete, growing state is bad, therefore simple plant growth property with porosity measurement green concrete is unscientific, for example, the brick porosity reaches more than 30%, but can not grow grass on brick,, therefore, green concrete should have the hole that can be fit to plant root growth, should have mutual connectivity between these holes, stretch and procreation, help soil chemistry conditional equilibrium in the hole so that plant root whisker can wriggle, be convenient to filling compound nutritional material, can strengthen the adhesive ability of vegetable layer simultaneously; So the present invention proposes the notion of green concrete effective aperture, it is defined as: can be fit to the plant root growth requirement in the green concrete, and connect the maximum of hole mutually can several apertures; Can plant possess one of leading indicator of growth conditions on the effective aperture measurement green concrete, but the method that does not have detection up to now, for application units are had regulations to abide by, suddenly treat the detection method of a kind of green concrete of demand effective aperture when weighing the growth of green concrete.

Summary of the invention

The object of the present invention is to provide the detection method of a kind of green concrete effective aperture, fill up the blank of green concrete effective aperture detection method, and can effectively guarantee the requirement of soil chemistry condition in plant root growth requirement and the hole and the requirement of compaction material.

Technical scheme of the present invention is to be to ensure under the prerequisite of protection safety according to green concrete, its structure should possess the growth property of plant, the operation of sowing, for the plant growth structure goes out necessary growing space, these spaces can hold necessary plant nutrient stuff, and can make root system of plant procreation growth; Simultaneously since on the green concrete growth of plant limit by growth period, germination percentage and various growth conditions, also be necessary for reseed, multiple cropping provides the necessary working condition; Our experiments show that, green concrete should have the hole that can be fit to plant root growth, should have mutual connectivity between these holes, so that can wriggling, stretches and procreation plant root whisker, can strengthen simultaneously the adhesive ability of vegetable layer, propose the effective aperture notion of green concrete for this reason, and be defined as in the green concrete and can be fit to the plant root growth requirement, and the maximum that connects hole mutually can several apertures, as the quality of evaluation green concrete growth property; Its basic detection method is: use some, the normal sand of certain particle diameter is spread in uniform in green concrete test specimen surface, behind the vibration certain hour, account for the percent of total amount according to normal sand by test specimen, come criterion sand to run through the ability of test specimen, but and then the root system of plant energy for growth of measurement green concrete, when the percent that accounts for total weight by test specimen sand grains weight on average surpasses 60%, can think that the effective aperture of this group test specimen is qualified, when the percent that accounts for total weight by test specimen sand grains weight on average less than 60% the time, think that promptly the effective aperture of this group test specimen is defective;

Detect step:

1, preparation normal sand:

Common building cleaned with sand and oven dry after, be that the standard sandstone of 4.75mm and 2.36mm filters out mean grain size less than 4.75mm with the aperture, the while, every 100g was one group, weighs with scale greater than the sand grains of 2.36mm;

2, test material preparation:

Make test specimen by certain water cement ratio (being water weight/cement weight), cement-aggregate ratio (cement weight/aggregate weight), test specimen is cylindrical, three every group; Test specimen maintenance under the standard curing condition is no less than 3 days, in temperature environment more than 20 ℃ air-dry 24 hours, reaches inside and outside absolutely dried condition;

3, test specimen is centered on sealing with cardboard, blended rubber band envelope is tight, and cardboard is higher than the test specimen surface, and to prevent normal sand from loss all around, influence detects effect;

4, test specimen is fixed on the sandstone screen cloth of aperture greater than 4.75mm;

5, get the normal sand portion (100g) of prescreening, evenly be sprinkling upon the test specimen surface;

6, will install screen cloth, take-up reel and the clamping of sieve lid of test specimen, be placed on the sieve shaker, and shake and sieved 5 minutes;

7, after the shutdown, sand grains in the take-up reel is carried out weighing, and calculating is by the percent of the shared total weight of weight (100g) of test specimen sand grains, so three test specimens are tested and calculated, average and be the effective aperture, when the percent that accounts for total weight by test specimen sand grains weight on average surpassed 60%, the effective aperture that is test specimen was qualified; When percent on average less than 60% the time, it is defective to be the test specimen effective aperture.

Can the invention has the advantages that: can the simple and direct green concrete that detects fast of method be fit to the plant root growth requirement, help soil chemistry conditional equilibrium in the hole, be convenient to filling compound nutritional material; Detect the green concrete effective aperture accurately, guarantee the growth property of green concrete.

Description of drawings:

Fig. 1 is a green concrete test specimen structural representation of the present invention;

Fig. 2 is the synoptic diagram of the invention process embodiment 1;

Fig. 3 is the synoptic diagram of the invention process embodiment 2;

Fig. 4 is the synoptic diagram of the invention process embodiment 3.

Embodiment:

As shown in Figure 1, be the test specimen structural representation of green concrete of the present invention.

To shown in the accompanying

drawing

4,1 is that test specimen, 2 is that take-up reel, 3 is that the sand grains, 4 that passes through is unsanctioned sand grains as accompanying drawing 2.

Embodiment 1:

Accompanying drawing 2 is the synoptic diagram that embodiment 1 is detected in green concrete of the present invention effective aperture.

It is as follows that it detects step:

1, preparation normal sand:

Common building cleaned with sand and oven dry after, be that the standard sandstone of 4.75mm and 2.36mm filters out mean grain size less than 4.75mm with the aperture, greater than the sand grains of 2.36mm, every 100g that weighs with scale is portion, three parts of components simultaneously;

2, test material preparation:

With mean grain size is that 19.0～26.5mm rubble is made test specimen, and selecting cement-aggregate ratio is 1: 8, water cement ratio 0.51, and test specimen is cylindrical, three every group; Test specimen maintenance 3 days under the standard curing condition in temperature environment more than 20 ℃ air-dry 24 hours, reaches inside and outside absolutely dried condition;

3, test specimen is centered on sealing with cardboard, any material of not filling of inside, blended rubber band envelope is tight, and cardboard is higher than test specimen surface 10mm, and to prevent normal sand from running off all around, influence detects effect;

6, screen cloth, take-up reel and the sieve lid that will install test specimen clamps, be placed on the top and hit on the formula runout instrument, sieve shake number of times 150 times/minute, bounce number of times 75 times/minute, vibrate 5 minutes;

7, after the shutdown, the sand grains 3 in the take-up reel 2 are carried out weighing, and calculate the percent by the shared total weight of weight (100g) of test specimen sand grains 3, so three test specimens are tested and calculated, averaging is the effective aperture, as shown in table 1.

Table 1

Testing result %
Testing result %				1#	2#	3#	On average
20	16	17	17.67	1#	2#	3#	On average

It is 17.67% that the normal sand weight of this test set by test specimen accounts for the percentile mean value of former weight, and less than 60%, its effective aperture is defective.

Embodiment 2:

Accompanying drawing 3 is the synoptic diagram that embodiment 2 is detected in green concrete of the present invention effective aperture.

It is as follows that it detects step:

1, preparation normal sand:

2, test material preparation:

With mean grain size is that 26.5mm～31.5mm rubble is made test specimen, and cement-aggregate ratio is 1: 8, water cement ratio 0.51, and test specimen is shaped as cylindrical, three every group; Test specimen maintenance 3 days under the standard curing condition in temperature environment more than 20 ℃ air-dry 24 hours, reaches inside and outside absolutely dried condition;

7, after the shutdown, the sand grains 3 in the take-up reel 2 are carried out weighing, and calculate the percent by the shared total weight of weight (100g) of test specimen sand grains 3, so three test specimens are tested and calculated, averaging is the effective aperture, as shown in table 2.

Table 2

Testing result %
Testing result %				1#	2#	3#	On average
35	59	37	43.67	1#	2#	3#	On average

It is 43.67% that the normal sand weight of this test set by test specimen accounts for the percentile mean value of former weight, and less than 60%, its effective aperture is defective.

Embodiment 3:

Accompanying drawing 4 is the synoptic diagram that embodiment 3 is detected in green concrete of the present invention effective aperture.

It is as follows that it detects step:

1, preparation normal sand:

2, test material preparation:

With mean grain size is that 31.5mm～37.5mm rubble is made test specimen, and cement-aggregate ratio is 1: 8, water cement ratio 0.51, and test specimen is shaped as cylindrical, three every group; Test specimen maintenance 3 days under the standard curing condition in temperature environment more than 20 ℃ air-dry 24 hours, reaches inside and outside absolutely dried condition;

7, after the shutdown, the sand grains 3 in the take-up reel 2 are carried out weighing, and calculate the percent that accounts for total weight (100g) by the weight of test specimen sand grains 3, so three test specimens are tested and calculated, averaging is the effective aperture, as shown in table 3.

Table 3

Testing result %
Testing result %				1#	2#	3#	On average
86	67	80	77.67	1#	2#	3#	On average

It is 77.67% that the normal sand weight of this test set by test specimen accounts for the percentile mean value of former weight, and greater than 60%, its effective aperture is qualified.

Claims

1, the detection method of a kind of green concrete effective aperture, it is characterized in that: normal sand is spread in uniform in green concrete test specimen surface, to account for the percent of total weight by the normal sand weight of test specimen after the vibration, come criterion sand to run through the ability of test specimen, but and then weigh the root system of plant energy for growth of green concrete.

2, the detection method of a kind of green concrete according to claim 1 effective aperture, it is characterized in that: said detection step is as follows:

(1) preparation normal sand:

Common building cleaned with sand and oven dry after, be that the standard sandstone of 4.75mm and 2.36mm filters out mean grain size less than 4.75mm with the aperture, greater than the sand grains of 2.36mm, weigh with scale simultaneously, every 100g is a portion, per 3 parts is one group;

(2) test material preparation:

Make test specimen, three every group by certain water cement ratio (being water weight/cement weight), cement-aggregate ratio (cement weight/aggregate weight);

(3), with test specimen with cardboard around sealing, blended rubber band envelope is tight, cardboard is higher than the test specimen surface;

(4), test specimen is fixed on the sandstone screen cloth of aperture greater than 4.75mm;

(5), get the normal sand 100g portion of prescreening, evenly be sprinkling upon the test specimen surface;

(6), screen cloth, take-up reel and the sieve lid that will install test specimen clamp, and is placed on the sieve shaker, vibrates 5 minutes;

(7), shut down after, the sand grains in the take-up reel is carried out weighing, and calculates percent by the shared total weight of weight (100g) of test specimen sand grains, so one group three of test specimens are detected one by one and calculate, get the testing result that arithmetic mean is the effective aperture.