CN104535458B - The measuring method of a kind of coarse aggregate bulk density and clearance rate - Google Patents
The measuring method of a kind of coarse aggregate bulk density and clearance rate Download PDFInfo
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- CN104535458B CN104535458B CN201510011999.4A CN201510011999A CN104535458B CN 104535458 B CN104535458 B CN 104535458B CN 201510011999 A CN201510011999 A CN 201510011999A CN 104535458 B CN104535458 B CN 104535458B
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Abstract
The present invention discloses the measuring method of a kind of coarse aggregate bulk density and clearance rate, first sampling and capacity tube, measure the quality of capacity tube, coarse aggregate is loaded in capacity tube, operate according to the different states of required mensuration coarse aggregate, take the total mass of capacity tube and coarse aggregate, afterwards, by to capacity tube water filling, taking the total mass of capacity tube, coarse aggregate and water. Finally, according to tap density and the clearance rate of measured data and the formulae discovery coarse aggregate of derivation. The inventive method can improve coarse aggregate bulk density and the Stability and veracity of clearance rate mensuration, significant for the coarse aggregate clearance rate obtained under the state of cement concrete jolt ramming accurately and the coarse aggregate skeleton clearance rate under asphalt tamping state, and then whether differentiation stone mastic asphalt skeleton embedded squeezing structure is formed provide important help.
Description
Technical field
The invention belongs to road engineering technical field, it is specifically related to the measuring method of a kind of coarse aggregate bulk density and clearance rate, can be applicable to measure the tap density (comprising natural deposited dry density, tap density and stamped density) of coarse aggregate, the clearance rate under clearance rate and coarse aggregate skeleton tamping state under coarse aggregate jolt ramming state.
Background technology
Tap density refers to that material is filled in a certain container according to certain way, and the quality of unit volume measured after having filled, can be divided into natural deposited dry density, tap density, stamped density according to different filling modes. The stacking volume of material comprises the space between material internal hole and particle. Measuring tap density for the clearance rate calculating under different stacking states is an essential link.
Coarse aggregate is the main integral part of cement concrete, accounts for more than the 50% of volume of concrete, and concrete performance is had remarkably influenced by its mechanical property, physicochemical property and consumption. The skeleton embedded squeezing lock knot effect of coarse aggregate, it is possible to improve the performance of cement concrete. And the determination of clearance rate under cement concrete coarse aggregate jolt ramming state and stability, significant for the reasonable proportion of composing of the coarse aggregate conveniently calculating interlocking compact structure.
Stone mastic asphalt (SMA) gathers materials as skeleton taking gap grading, is the asphalt of binder with the bitumastic of modifying asphalt, fiber stabilizer, ore deposit powder composition. It is filled in the space of the stone stone embedded squeezing structure that coarse aggregate is formed by enough asphaltic binders and the bitumastic rubber cement with suitable stiffness to be formed. When carrying out SMA mixture proportioning and design, the most important judges whether coarse aggregate forms embedded squeezing structure exactly. Judge according to being to compare under tamping state coarse aggregate skeleton clearance rate VCAdrcWith the size of coarse aggregate skeleton clearance rate VCAmix in Ma Xieer standard specimen. The judgement whether accuracy of data determination will directly have influence on embedded squeezing structure and formed.
The measuring method that " highway engineering gather materials testing regulation JTGE42-2005 " T0309-2005 coarse aggregate bulk density and voidage provide in testing can produce bigger error. Measuring method in specification is for whether capacity tube fills up, and the standard provided is: " fills capacity tube and removes the particle protruding cylinder discharge surface, and insert depression space with suitable particle, make the volume of the slightly protruding part in surface and depression part roughly equal. " actually operating find this standard be difficult to differentiate, not easily unify.
Summary of the invention
It is an object of the present invention to provide the measuring method of a kind of coarse aggregate bulk density and clearance rate, it is the accuracy improving coarse aggregate bulk density and clearance rate mensuration, reduces the variability of parallel test data.
The present invention is by the following technical solutions:
A measuring method for coarse aggregate bulk density and clearance rate, comprises the steps:
Step 1: according to the sampling of T0301-2005 coarse aggregate sampling system in " highway engineering gather materials testing regulation JTGE42-2005 ", dry or tile air-dry, be evenly divided into more than two parts, for parallel test;
Step 2: choose capacity tube according to coarse aggregate nominal maximum aggregate size, takes the quality m of capacity tube1;
Step 3: according to the coarse aggregate different states of required mensuration, fills capacity tube by sample and makes coarse aggregate surface overall higher than capacity tube mouth, take the total mass m of sample and capacity tube2;
Step 4: slowly water filling in capacity tube, until liquid level is roughly concordant with capacity tube mouth, standing for some time makes coarse aggregate open pores fully absorb water;
Step 5: again to water filling in capacity tube, makes liquid level just concordant with capacity tube mouth, takes the total mass m of capacity tube, sample and water3;
Step 6: outwelled by coarse aggregate, fills capacity tube with water, makes liquid level just concordant with capacity tube mouth, takes the total mass m of capacity tube and waterw;
Step 7: according to the testing data of above step, calculates tap density and the clearance rate of coarse aggregate:
The quality that coarse aggregate absorbs water
The clearance rate of cement concrete under coarse aggregate jolt ramming state
Clearance rate under coarse aggregate skeleton tamping state used for asphalt mixture
The tap density of coarse aggregate under natural packing state
The tap density of the cement concrete coarse aggregate that jolt ramming method measures
The tap density of the coarse aggregate used for asphalt mixture that tamping method measures
Wherein, ��aFor the apparent density of coarse aggregate, ��bFor the bulk density of coarse aggregate.
Further, drying described in step 1 is dry in the baking oven of 105 DEG C �� 5 DEG C.
Further, the time left standstill described in step 4 is 24h �� 1h.
The useful effect of the present invention:
Comparing with clearance rate measuring method with conventional tap density, the present invention has obvious advantage in the following aspects:
(1) for whether capacity tube fills up, it provides be more easy to the standard differentiated. Being stated as of former tentative specification: " fill capacity tube and remove the particle protruding cylinder discharge surface, and insert depression space with suitable particle, make the volume of the slightly protruding part in surface and depression part roughly equal. " actually operating discovery, this standard is difficult to define. Judging standard of the present invention is: " again to water filling in capacity tube, make liquid level just concordant with capacity tube mouth. " this standard is more prone to unified.
(2) the inventive method can obtain more stable testing data. The standard provided due to the inventive method is easy to differentiate more, and therefore the variability of parallel test is less, and the data obtained are also more stable.
The inventive method can improve coarse aggregate bulk density and the Stability and veracity of clearance rate mensuration, significant for the coarse aggregate clearance rate obtained under the state of cement concrete jolt ramming accurately and the coarse aggregate skeleton clearance rate under asphalt tamping state, and then whether differentiation stone mastic asphalt (SMA) skeleton embedded squeezing structure is formed provide important help.
Embodiment
Below in conjunction with embodiment the present invention done and further explain. The following example is only for illustration of the present invention, but is not used for limiting the practical range of the present invention.
A measuring method for coarse aggregate bulk density and clearance rate, comprises the steps:
Step 1: according to the sampling of T0301-2005 coarse aggregate sampling system in " highway engineering gather materials testing regulation JTGE42-2005 ", division, quality should meet test requirements document, the baking oven of 105 DEG C �� 5 DEG C is dried, can also be spread out on cleaning ground air-dry, evenly be divided into more than two parts after mixing thoroughly for subsequent use.
Step 2: choose suitable capacity tube according to coarse aggregate nominal maximum aggregate size, the specification being applicable to the capacity tube that coarse aggregate bulk density measures requires such as table 1, and takes the quality m of capacity tube1��
The specification requirement of table 1 capacity tube
Step 3: by the difference of coarse aggregate state, can be divided into natural packing, tapped bulk, tamping to pile up three kinds of density. (1) for natural deposited dry density, play sample with tack spade, coarse aggregate is freely fallen in capacity tube, without the need to jolt ramming or tamping in process. (2) for tapped bulk density, the capacity tube filling sample is put on a vibration table, vibration 3min. (3) for tamping tap density, coarse aggregate is loaded capacity tube about 1/3 volume, with the even tamping of tamper 25 times, then repeat previous step. Namely coarse aggregate divides 3 times and loads capacity tube, each tamping 25 times. During three kinds of sedimentating density measurings, its common ground be all finally make sample fill capacity tube and coarse aggregate surface overall a little more than capacity tube mouth, and take sample and capacity tube total mass m2��
Step 4: slowly water filling in capacity tube, avoid producing bubble, until liquid level is roughly concordant with capacity tube mouth, ensure that water does not overflow, leave standstill 24h �� 1h (consistent with during mensuration coarse aggregate bulk density, it is intended that coarse aggregate open pores is fully absorbed water).
Step 5: again to water filling in capacity tube, makes liquid level just concordant with capacity tube mouth. Take the total mass m of capacity tube, sample and water3��
Step 6: outwelled by coarse aggregate, fills capacity tube with water, consistent with step 5, makes liquid level just concordant with capacity tube mouth, dries the moisture of drum outer wall, takes the total mass m of capacity tube and waterw��
Step 7: according to the testing data of above step, calculates tap density and the clearance rate of coarse aggregate.
(1) the water suction quality of coarse aggregate calculates by formula (1):
In formula: mInhaleThe quality (kg) that coarse aggregate absorbs water;
m1The quality (kg) of capacity tube;
m2The total mass (kg) of sample and capacity tube;
��aApparent density (the kg/m of coarse aggregate3);
��bBulk density (the kg/m of coarse aggregate3)��
(2) clearance rate of cement concrete under coarse aggregate jolt ramming state calculates by formula (2):
In formula: VCThe clearance rate of cement concrete under coarse aggregate jolt ramming state;
m1The quality (kg) of capacity tube;
m2(under jolt ramming state) sample and capacity tube total mass (kg);
m3The total mass (kg) of (under jolt ramming state) capacity tube, sample and water;
mwWhen filling capacity tube with water, the total mass (kg) of capacity tube and water.
(3) clearance rate under coarse aggregate skeleton tamping state used for asphalt mixture calculates by formula (3):
In formula: VCAdrcClearance rate under coarse aggregate skeleton tamping state used for asphalt mixture;
m1The quality (kg) of capacity tube;
m2The total mass (kg) of (under tamping state) sample and capacity tube;
m3The total mass (kg) of (under tamping state) capacity tube, sample and water;
mInhaleThe quality (kg) that coarse aggregate absorbs water;
mwWhen filling capacity tube with water, the total mass (kg) of capacity tube and water.
(4) calculating of tap density:
1. under natural packing state, the tap density of coarse aggregate presses formula (4) calculating:
In formula: ��NatureTap density (the kg/m of coarse aggregate under natural packing state3);
��bBulk density (the kg/m of coarse aggregate3);
m1The quality (kg) of capacity tube;
m2The total mass (kg) of (under natural packing state) sample and capacity tube;
m3The total mass (kg) of (under natural packing state) capacity tube, sample and water;
mInhaleThe quality (kg) that coarse aggregate absorbs water;
mwWhen filling capacity tube with water, the total mass (kg) of capacity tube and water.
The tap density of the cement concrete coarse aggregate that 2. jolt ramming method measures calculates by formula (5):
In formula: ��Jolt rammingTap density (the kg/m of the cement concrete coarse aggregate that jolt ramming method measures3);
��aApparent density (the kg/m of coarse aggregate3);
m1The quality (kg) of capacity tube;
m2(under jolt ramming state) sample and capacity tube total mass (kg);
m3The total mass (kg) of (under jolt ramming state) capacity tube, sample and water;
mwWhen filling capacity tube with water, the total mass (kg) of capacity tube and water.
The tap density of the coarse aggregate used for asphalt mixture that 3. tamping method measures calculates by formula (6):
In formula: ��TampingTap density (the kg/m of the coarse aggregate used for asphalt mixture that tamping method measures3);
��bBulk density (the kg/m of coarse aggregate3);
m1The quality (kg) of capacity tube;
m2The total mass (kg) of (under tamping state) sample and capacity tube;
m3The total mass (kg) of (under tamping state) capacity tube, sample and water;
mInhaleThe quality (kg) that coarse aggregate absorbs water;
mwWhen filling capacity tube with water, the total mass (kg) of capacity tube and water.
Embodiment 1
The measuring method of the present invention has obtained good verification experimental verification. Adopt coarse aggregate bulk density and coarse aggregate skeleton clearance rate that the method in current specifications and the inventive method determine under tamping state respectively.
The instrument that this embodiment needs and material comprise: (1) balance (sense amount is not more than the 0.1% of weighing); (2) 5L capacity tube; (3) tack spade; (4) baking oven (energy temperature control 105 DEG C �� 5 DEG C); (5) shaking table (frequency is 3000 times/min �� 200 time/min, and the amplitude under load is 0.35mm, and amplitude time unloaded is 0.5mm); (6) the tamper steel rod of round end (diameter 16mm, long 600mm, the one end be); (7) 1000mL beaker; (8) coarse aggregate adopts basalt.
Bulk density and the apparent density of coarse aggregate is measured according to the method in " JTGE42-2005 highway engineering gather materials testing regulation " T0308 testing regulation 05. Result is as shown in table 2.
The density that table 2 gathers materials and water-intake rate
| Bulk density g/cm3 | Apparent density g/cm3 | Water-intake rate |
| 2.775 | 2.867 | 0.0116 |
Wherein, water-intake rate is the difference of bulk density Reciprocals sums apparent density inverse.
Surveyed the tamping tap density of coarse aggregate by method for normalizing and clearance rate result as shown in table 3.
Table 3 method for normalizing is surveyed tamping tap density and the clearance rate of coarse aggregate
| Cylinder/g | Volume correction/g | Cylinder+coarse aggregate/g | Tap density g/cm3 | Clearance rate/% |
| 1430 | 6331 | 9913 | 1.731 | 37.62 |
| 1430 | 6331 | 10022 | 1.753 | 36.83 |
| 1430 | 6331 | 10150 | 1.779 | 35.89 |
Data from table 3 are it can be seen that three parallel tests, and the difference of tap density maxima and minima is 0.048, accounts for the 2.74% of mean density value. The difference of clearance rate maxima and minima is 1.73%, accounts for the 4.70% of clearance rate average.
Surveyed the tamping tap density of coarse aggregate by the method for the present invention and clearance rate result as shown in table 4.
Table 4 the inventive method is surveyed tamping tap density and the clearance rate of coarse aggregate
| m1/g | mw/g | m2/g | mInhale/g | m3/g | Clearance rate/% | Tap density g/cm3 |
| 1430 | 6331 | 10263 | 101.6 | 12255 | 38.57 | 1.705 |
| 1430 | 6331 | 10198 | 100.6 | 12174 | 38.27 | 1.713 |
| 1430 | 6331 | 10228 | 101.1 | 12210 | 38.38 | 1.710 |
Data from table 4 are it may be seen that three parallel tests, and the difference of tap density maxima and minima is 0.008, accounts for the 0.5% of mean density value. The difference of clearance rate maxima and minima is 0.3%, accounts for the 0.8% of clearance rate average. It may be seen that the method applied in the present invention has less data variation.
Claims (3)
1. the measuring method of a coarse aggregate bulk density and clearance rate, it is characterised in that, comprise the steps:
Step 1: according to the sampling of T0301-2005 coarse aggregate sampling system in " highway engineering gather materials testing regulation JTGE42-2005 ", dry or tile air-dry, be evenly divided into more than two parts, for parallel test;
Step 2: choose capacity tube according to coarse aggregate nominal maximum aggregate size, takes the quality m of capacity tube1;
Step 3: according to the coarse aggregate different states of required mensuration, fills capacity tube by coarse aggregate and makes coarse aggregate surface overall higher than capacity tube mouth, take the total mass m of coarse aggregate and capacity tube2;
Step 4: slowly water filling in capacity tube, until liquid level is roughly concordant with capacity tube mouth, standing for some time makes coarse aggregate open pores fully absorb water;
Step 5: again to water filling in capacity tube, makes liquid level just concordant with capacity tube mouth, takes the total mass m of capacity tube, coarse aggregate and water3;
Step 6: outwelled by coarse aggregate, fills capacity tube with water, makes liquid level just concordant with capacity tube mouth, takes the total mass m of capacity tube and waterw;
Step 7: according to the testing data of above step, calculates tap density and the clearance rate of coarse aggregate:
The quality that coarse aggregate absorbs water
The clearance rate of cement concrete under coarse aggregate jolt ramming state
Clearance rate under coarse aggregate skeleton tamping state used for asphalt mixture
The tap density of coarse aggregate under natural packing state
The tap density of the cement concrete coarse aggregate that jolt ramming method measures
The tap density of the coarse aggregate used for asphalt mixture that tamping method measures
Wherein, ��aFor the apparent density of coarse aggregate, ��bFor the bulk density of coarse aggregate.
2. the measuring method of coarse aggregate bulk density according to claim 1 and clearance rate, it is characterised in that, drying described in step 1 is dry in the baking oven of 105 DEG C �� 5 DEG C.
3. the measuring method of coarse aggregate bulk density according to claim 1 and clearance rate, it is characterised in that, the time left standstill described in step 4 is 24h �� 1h.
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| CN105699274A (en) * | 2016-04-13 | 2016-06-22 | 青神鑫统领建材有限公司 | Coarse aggregate voidage testing device and method |
| CN106290062B (en) * | 2016-08-26 | 2019-01-08 | 江苏大学 | Powder bulk density detecting line sensor and detection method during a kind of screw feeding |
| CN106769649A (en) * | 2016-12-14 | 2017-05-31 | 河南理工大学 | A kind of assay method of wet type prose style free from parallelism bulk density and void ratio |
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| CN107192637A (en) * | 2017-06-30 | 2017-09-22 | 华南理工大学 | A kind of method for determining full recycled fine aggregate and the tightly packed optical sand percentage of stone |
| CN107607426A (en) * | 2017-08-07 | 2018-01-19 | 中国石油天然气集团公司 | The deposition rate and voidage assay method of a kind of cementing concrete mixture system |
| CN111831961B (en) * | 2020-07-30 | 2021-07-27 | 山东大学 | Cement dose estimation method and system for skeleton compact type cement stabilized macadam |
| CN115343201A (en) * | 2022-05-31 | 2022-11-15 | 山东大学 | Method for testing gap rate of roadbed filled with road arches by irrigation |
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| US20020117090A1 (en) * | 2001-02-20 | 2002-08-29 | Richard Ku | Super high strength concrete |
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| CN101614646A (en) * | 2009-01-13 | 2009-12-30 | 深圳市市政工程总公司 | The assay method of coarse aggregate clearance rate |
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Application publication date: 20150422 Assignee: Jiangsu Tiannuo Road Material Science & Technology Co., Ltd. Assignor: Southeast University Contract record no.: 2018320000119 Denomination of invention: Determination method for bulk density and clearance rate of coarse aggregates Granted publication date: 20160608 License type: Exclusive License Record date: 20180613 |
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Assignee: Jiangsu Tiannuo Road Material Science & Technology Co., Ltd. Assignor: Southeast University Contract record no.: 2018320000119 Date of cancellation: 20191107 |