CN104345075A - Method and device for measuring initial setting time and final setting time of cement - Google Patents
Method and device for measuring initial setting time and final setting time of cement Download PDFInfo
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- CN104345075A CN104345075A CN201410592964.XA CN201410592964A CN104345075A CN 104345075 A CN104345075 A CN 104345075A CN 201410592964 A CN201410592964 A CN 201410592964A CN 104345075 A CN104345075 A CN 104345075A
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Abstract
The invention discloses a method and a device for measuring the initial setting time and the final setting time of cement, and relates to the technical field of building materials. The technical problem of influence on the cement engineering quality due to low accuracy of the initial setting time and final setting time measurement in the prior art is solved. The method and the device have the main technical scheme that the device for measuring the initial setting time and the final setting time of the cement comprises a resistivity measuring device and a first data processing device, wherein the resistivity measuring device is used for measuring the smallest resistivity value in the cement hydration process and the cement hydration time corresponding to the smallest resistivity value, and the first data processing device is connected with the resistivity measuring device and is used for obtaining the initial setting time and the final setting time of the cement according to the value measured by the resistivity measuring device. The method and the device are mainly used for precisely measuring the initial setting time and the final setting time of the cement.
Description
Technical field
The present invention relates to building material technical field, particularly relate to a kind of method and apparatus measuring jelling time and final setting time.
Background technology
Cement setting time is the important technology index of cement, and cement setting time comprises presetting period and final setting time, the presetting period be from cement plus water mix to grout lose time of plasticity; Final setting time be from cement plus water mix to grout lose plasticity completely and there is time of hardness.If the setting time of cement is inappropriate, then can affect the permanance of the intensity of cement and packing, the workability (mobility, plasticity, Yi Mixing) of cement, application property, cement volume stability and cement, thus cause important impact to construction, speed of application and construction quality.Therefore, Accurate Determining goes out presetting period of cement and final setting time to ensureing that the construction quality of cement is significant.
Prior art mainly adopts Vicat apparatus method to measure the setting time of cement.Utilize Vicat apparatus method to measure the main working specification of cement setting time as follows, loaded by cement paste in the round mould of Vicat apparatus, vibration several strikes off, and concrete paste specimen maintenance in moisture curing box is tested to carrying out first time during 30min after adding water; During test, test point contacts with clean slurry face, loosens suddenly after tighten the screws, test point Vertical Free sinks to clean slurry, observes total indicator reading when test point stops sinking, when test point is sink to apart from base plate 3-5mm, being cement and reaching initial set state, is that cement reaches final set state when test point sinks to being no more than 0.5mm.
The setting time that inventor's discovery utilizes Vicat apparatus method to measure cement, at least there are the following problems: the first, and viewed from aforesaid operations code, the presetting period of Vicat apparatus method measurement has the error of 5min at least; Measure the error that final setting time has 15min at least, so the precision of Vicat apparatus method is lower.The second, measuring cement setting time due to Vicat apparatus method can because operating personnel, instrument be different and change to some extent, cause the stability of measurement result and repeatability poor.3rd, Vicat apparatus method measures cement setting time to be needed through stirring, and measure submergence depth, draw normal consistency water requirement, continue numerous and diverse step such as mechanical raking, maintenance, repetitive measurement, operation easier is larger.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of device measuring jelling time and final setting time, determines the setting time of cement with shirtsleeve operation exactly, thus guarantees the construction quality of cement.
For achieving the above object, the present invention mainly provides following technical scheme: a kind of device measuring jelling time and final setting time, comprising:
Instrument of Electrical Resistivity Measurement, for determining the minimum specific resistance value of cement in hydration process and the hydrated cementitious time corresponding with minimum specific resistance value;
First data processing equipment, is connected with described Instrument of Electrical Resistivity Measurement, for the minimum specific resistance value that determines according to described Instrument of Electrical Resistivity Measurement and the hydrated cementitious time corresponding with minimum specific resistance value, obtains presetting period and the final setting time of cement.
The device of aforesaid mensuration jelling time and final setting time, described Instrument of Electrical Resistivity Measurement comprises:
Signal generation apparatus;
Primary coil, is connected with described signal generation apparatus, makes described primary coil produce alternating voltage by described signal generation apparatus;
Iron core, is equipped with described primary coil, for responding to the exchange current of described primary coil to produce alternating magnetic field;
Secondary coil placement portion, is equipped with described iron core, for settling the secondary coil of the ring-type be made up of cement sample to be measured, makes described secondary coil under action of alternating magnetic field, produce loop voltag V and circular current I;
Voltage measuring device, for measuring the loop voltag V in secondary coil;
Current-flow test set, for measuring the circular current I in secondary coil;
Timer, records the hydration time of cement sample to be measured;
Second data processing equipment, be connected with described voltage measuring device, current-flow test set and timer respectively, for calculating the resistivity of the cement sample to be measured of different hydration time, and then obtain the minimum specific resistance of cement sample to be measured in hydration process and the hydration time corresponding to minimum specific resistance.
The device of aforesaid mensuration jelling time and final setting time, described Instrument of Electrical Resistivity Measurement also comprises amplifier, described amplifier is connected with described signal generation apparatus and described primary coil respectively, amplifies for the signal described signal generation apparatus being sent to primary coil.
The device of aforesaid mensuration jelling time and final setting time, described first data processing equipment, the second data processing equipment are same data processing equipment.
The device of aforesaid mensuration jelling time and final setting time, described secondary coil placement portion is the housing of ring-type; The housing of described ring-type is sleeved on described iron core;
The housing of described ring-type is provided with upper cover, annular cement sample to be measured to be placed in the housing of described ring-type.
The device of aforesaid mensuration jelling time and final setting time, described first data processing equipment goes out the presetting period of cement according to following formulae discovery:
T
initial＝T
min+165.95×ρ
min-22.424；
Wherein: T
initialfor the presetting period of cement; T
minfor the hydration time of cement when minimum specific resistance; ρ
minfor cement minimum specific resistance;
Described first data processing equipment goes out the final setting time of cement according to following formulae discovery:
T
final＝T
min+174.24×ρ
min+31.315；
Wherein: T
finalfor the final setting time of cement, T
minfor setting time during lowest resistivity; ρ
minfor cement lowest resistivity.
Another object of the present invention is to provide a kind of method measuring jelling time and final setting time, comprises the steps:
Determine the minimum specific resistance value of cement sample to be measured in hydration process and the hydration time of cement sample to be measured when minimum specific resistance;
Presetting period and the final setting time of cement to be measured is obtained according to the minimum specific resistance value of cement sample, the cement sample to be measured hydration time when minimum specific resistance.
The method of aforesaid mensuration jelling time and final setting time, goes out the presetting period of cement according to following formulae discovery:
T
initial＝T
min+165.95×ρ
min-22.424；
Wherein: T
initialfor the presetting period of cement; T
minfor the hydration time of cement when minimum specific resistance; ρ
minfor cement minimum specific resistance.
The method of aforesaid mensuration jelling time and final setting time, goes out the final setting time of cement according to following formulae discovery:
T
final＝T
min+174.24×ρ
min+31.315；
Wherein: T
finalfor the final setting time of cement, T
minfor setting time during lowest resistivity; ρ
minfor cement lowest resistivity.
The method of aforesaid mensuration jelling time and final setting time, adopts the Instrument of Electrical Resistivity Measurement described in above-mentioned any one to determine the minimum specific resistance value of cement sample to be measured in hydration process and the hydration time of cement sample to be measured when minimum specific resistance.
The apparatus and method of the mensuration jelling time that the embodiment of the present invention proposes and final setting time, by constantly measuring the circular current of cement, loop voltag and hydration time in cement hydration process, obtain the resistivity of cement sample at different hydration time, obtain the minimum specific resistance value of cement sample in hydration process and the cement sample hydration time corresponding when resistivity is minimum further, thus obtain presetting period and the final setting time of cement.The mensuration jelling time that the embodiment of the present invention proposes and the device of final setting time only need take a morsel cement production systD annular cement sample while cement is built, and the annular cement sample made being placed in the secondary coil placement portion of the device of the embodiment of the present invention, the device of the embodiment of the present invention just can measure minimum presetting period and the final setting time of cement sample fast and accurately subsequently.Without the need to carrying out the loaded down with trivial details operation such as blanks and moulding and conserving, stirring to cement, the method for testing of the embodiment of the present invention does not change any characteristic of cement, and the result accuracy measured is high, and stability is stronger.
Accompanying drawing explanation
A kind of device measuring jelling time and final setting time that Fig. 1 provides for one embodiment of the invention;
A kind of device measuring jelling time and final setting time that Fig. 2 provides for another embodiment of the present invention;
The minimum specific resistance ρ that Fig. 3 provides for one embodiment of the invention
minwith presetting period T
initialwith hydration time T during minimum specific resistance
minthe relation of difference;
The minimum specific resistance ρ that Fig. 4 provides for one embodiment of the invention
minwith final setting time T
finalwith hydration time T during minimum specific resistance
minthe relation of difference;
The presetting period T that the method that Fig. 5 provides for one embodiment of the invention records
r-initialthe presetting period T recorded with Vicat apparatus method
v-initialcorrelativity figure;
Fig. 6 for one embodiment of the invention provide the final setting time T that records of method
r-finalthe final setting time T recorded with Vicat apparatus method
v-finalcorrelativity figure;
The hydrated cementitious change in resistance curve that two different devices that Fig. 7 provides for one embodiment of the invention record.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with preferred embodiment, to a kind of embodiment, feature and the effect thereof measuring the device and method of jelling time and final setting time proposed according to the present invention, be described in detail as follows.
Embodiment 1
As shown in Figure 1, present embodiments provide a kind of device measuring jelling time and final setting time, the device of this mensuration jelling time and final setting time comprises Instrument of Electrical Resistivity Measurement 1 and the first data processing equipment 2.Wherein, Instrument of Electrical Resistivity Measurement 1 for determine the minimum specific resistance value of cement in hydration process and cement resistor rate minimum time corresponding hydration time (the hydrated cementitious time corresponding to minimum specific resistance value).First data processing equipment 2 is connected with Instrument of Electrical Resistivity Measurement, for the numerical value measured according to described Instrument of Electrical Resistivity Measurement, obtains presetting period and the final setting time of cement.
The first data processing equipment 2 through type (1) in the present embodiment calculates the presetting period of cement:
T
initial=T
min+ 165.95 × ρ
min-22.424 formulas (1)
Wherein: T
initialfor the presetting period of cement; T
minhydration time during minimum specific resistance (cement in hydration process, hydration time corresponding when resistivity is minimum, below in like manner); ρ
minfor cement minimum specific resistance;
The first data processing equipment 2 in the present embodiment calculates the final setting time of cement according to formula (2):
T
final=T
min+ 174.24 × ρ
min+ 31.315 formulas (2)
Wherein: T
finalfor the final setting time of cement, T
minfor hydration time during minimum specific resistance; ρ
minfor cement lowest resistivity.
The first data processing equipment 2 in the present embodiment is preset with the calculation procedure software utilizing above-mentioned formulae discovery jelling time and final setting time.
The device that the present embodiment provides for measuring various different cement, as presetting period and the final setting time of nuclear power cement, Portland cement.
Embodiment 2
As shown in Figure 2, preferably, the Instrument of Electrical Resistivity Measurement 1 in the present embodiment comprises signal generation apparatus 11, primary coil 12, iron core 13, secondary coil placement portion 14, voltage measuring device 15, current-flow test set 16, timer 17 and the second data processing equipment 18.
Wherein, signal generation apparatus 11 is connected with primary coil 12, for sending signal to primary coil 12, produces alternating voltage to make primary coil 12.Iron core 13 and primary coil 12 are equipped with (preferably, primary coil 12 is sleeved on iron core 13), for the exchange current in inductive primary coil 12, to produce alternating magnetic field.Secondary coil placement portion 14 and iron core 13 are equipped with, and for settling the secondary coil be made up of ring-type cement sample to be measured, with under the effect of alternating magnetic field, form loop voltag V and circular current I in secondary coil.Voltage measuring device 15 is connected with secondary coil, for measuring the loop voltag V in secondary coil; Current-flow test set is connected with secondary coil, for measuring the circular current I in secondary coil.Timer 17 is for recording the hydration time of cement sample.Second data processing equipment 18 is connected with timer 17, voltage measuring device 15, current-flow test set 16 respectively, for constantly gathering the hydrated cementitious time that timer 17 records, the loop current value of the secondary coil that the secondary coil loop voltag value that voltage measuring device 15 measures, current-flow test set 16 measure, to obtain the change curve of the resistivity of cement sample to be measured in hydration process along with the time, and then obtain the minimum specific resistance value of cement sample in hydration process and the hydration time corresponding to minimum specific resistance.
Wherein, the cement sample to be measured in the present embodiment is the cement-based material (the cement production systD annular cement that takes a morsel while cement is built sample) newly mixed, to ensure that test and aquation are synchronously carried out.
Preferably, the secondary coil placement portion in the present embodiment is the ring mould of a circle, for the secondary coil that splendid attire is made up of cement sample to be measured.Secondary coil placement portion in the present embodiment also can be the housing of ring-type; The housing of ring-type is sleeved on described iron core; The housing of ring-type is provided with upper cover, to be placed in the housing of ring-type by annular cement sample to be measured.
Preferably, the signal that the signal generation apparatus in the present embodiment sends makes primary coil 12 produce the voltage signal of alternation again after signal amplifier 19 amplifies.Such as, signal generator have issued a signal, after amplifier, signal strengthens, exchange current in primary coil is increased, thus makes to obtain alternating magnetic field and strengthen, and then the loop voltag that produces of secondary coil and circular current also can increase, thus reduce measurement difficulty, improve the accuracy of measurement result.
The second data processing equipment 18 in the present embodiment constantly gathers loop voltag V, the circular current I of measurement and the hydration time of cement sample, corresponding resistivity is calculated according to the value of loop voltag V and circular current I, obtain the increase along with the hydrated cementitious time, the change in resistance of cement sample.Data processor is preset in the second data processing equipment 18, avoid the possibility that follow-up numerous and diverse artificial calculating brings mistake, the resistivity value of tested sample can be observed at any time, and when resistivity value is minimum Timeliness coverage record, during use, the annular cement sample of same size size can be adopted, by the dimensional data of cement sample input data acquisition processing device, data acquisition processing device is according to the loop voltag V recorded and circular current I, and the data of input carry out computing, and operation result is presented on the display screen of data acquisition processing device, printing equipment can also be connected, directly print the cement sample Resistivity testing report of prescribed form, or print the resistivity curve figure of cement sample as shown in Figure 6.
Preferably, the first data processing equipment 2 in the present embodiment and the second data processing equipment 18 can adopt same data processing equipment, and this data processing equipment is in a computer integrated.
Preferably, can annular cement sample handler be set near secondary coil placement portion 14, measure for annular cement sample is loaded secondary coil placement portion 14, and move away from secondary coil placement portion 14 after having measured, with the mensuration making this plant automation carry out next cement sample.This annular cement sample handler can be a mechanical arm, takes and moves annular cement sample, completing handling.
The apparatus and method of the mensuration jelling time that the present embodiment proposes and final setting time, by constantly measuring the circular current of cement, loop voltag and hydration time in cement hydration process, obtain the resistivity of cement sample at different hydration time, obtain the minimum specific resistance value of cement sample in hydration process and the cement sample hydration time corresponding when resistivity is minimum further, thus obtain presetting period and the final setting time of cement.The mensuration jelling time that the embodiment of the present invention proposes and the device of final setting time only need take a morsel cement production systD annular cement sample while cement is built, and the annular cement sample made being placed in the secondary coil placement portion of the device of the embodiment of the present invention, the device of the embodiment of the present invention just can measure minimum presetting period and the final setting time of cement sample fast and accurately subsequently.Without the need to carrying out the loaded down with trivial details operation such as blanks and moulding and conserving, stirring to cement, the method for testing of the embodiment of the present invention does not change any characteristic of cement, and the result accuracy measured is high, and stability is stronger.
Embodiment 3
Present embodiments provide a kind of method measuring jelling time and final setting time, comprise the steps:
1) minimum specific resistance of cement sample to be measured in hydration process and the hydration time of cement sample to be measured when minimum specific resistance is determined;
2) presetting period and the final setting time of cement is obtained according to minimum specific resistance, the cement hydration time when minimum specific resistance.
Above-mentioned steps 1) and step 2) adopt the mensuration jelling time of embodiment 1 proposition and the device of final setting time to measure.
Particularly, cement sample to be measured is while cement is built, and take a morsel cement production systD; Cement sample to be measured for the ring-type made is placed on the secondary coil placement portion on the device measuring jelling time and final setting time.Unlocking testing device, signal generator sends signal makes primary coil produce the voltage signal of alternation; The voltage signal of alternation is formed alternating magnetic field by iron core induction; The secondary coil that cement sample is made produces induction to alternating magnetic field, forms loop voltag V and circular current I in the cement sample of ring-type; The loop voltag V of secondary coil when measuring different time continuously and circular current I, and calculate annular cement sample resistance value and the resistivity of different hydration time, draw the hydration time corresponding to minimum specific resistance value and minimum specific resistance.
The present embodiment measures the lasting resistivity of cement sample by the principle of similar transformer, and can not have an impact to the properties of cement sample, namely measurement accuracy is higher, simultaneously, structure is simple, and signal generation apparatus can adopt an alternating source to realize, and operates also easier.
According to the above-mentioned electricalresistivityρ recorded
minwith hydration time T during minimum specific resistance
minsubstitute into above-mentioned formula (1) and calculate jelling time T
initial.
According to the above-mentioned electricalresistivityρ recorded
minwith hydration time T during minimum specific resistance
minsubstitute into above-mentioned formula (2): calculate jelling time T
final.
The mensuration presetting period that the present embodiment provides and the method for final setting time are by measuring the minimum specific resistance of cement in hydration process and the hydration time corresponding with minimum specific resistance, and the presetting period of cement can be obtained by simple formulae discovery, easy and simple to handle, result good stability, reproducible, degree of accuracy is high, simultaneously, full machine operation can be realized, avoid the error that manual operation brings, the measurement of continuation, avoid the measuring error that measuring intervals of TIME brings, the continuous automatic measurement in unmanned situation can be realized, automaticity is high, adaptivity is good, convenient and time-saving.
Embodiment 4
The present embodiment is to cement lowest resistivity ρ
min, minimum specific resistance time hydration time T
min, presetting period T
initial, final setting time T
finalrelation carry out labor explanation.
In the art, be called " breaking-in period " time of cement self-watering to resistivity minimum value, in " breaking-in period ", various ion-solubility is in water, but generates a large amount of Ca (OH) except when just adding water
2outward, the Ca (OH) of slurry
2content almost constant within " breaking-in period ".Cement Research on The Rheology draws in the time of general 1 hour after adding the water, the plastic viscosity of cement slurry and limiting shearing stress are almost constant, and start after 1h to increase, i.e. time of experiencing 1 hour lucky " breaking-in period ", therefore " breaking-in period " can be regarded as the preproduction phase of condensation, will exert a decisive influence to rate of setting in the ion concentration in this stage institute " generation ", so, the time that " breaking-in period " terminate can be chosen, the time T that namely resistivity minimum value is corresponding
minas one of parameter measured.
As from the foregoing, the presetting period of cement can be regarded as and be made up of two parts, a hydration time T when part is minimum specific resistance
min, reflect the length of ion-solubility required time; Another part is lowest resistivity ρ
min, reflect the impact of ion concentration on setting time.
The relation of setting time is write as the form of formula (3):
T
setting＝T
min+f(ρ
min) (3)
In formula (3): T
settingfor the setting time of cement (comprises presetting period T
initialwith final setting time T
final).
Formula (3) is carried out conversion draw:
T
setting-T
min＝f(ρ
min) (4)
As can be seen from formula (4), according to T
setting-T
minand ρ
minrelation, function f (ρ can be tried to achieve
min).
The different manufacturers randomly drawed, different intensity grades nuclear power cement, when water cement ratio be 0.4, temperature measures its aquation resistivity minimum value ρ when being 20 DEG C
min, the corresponding time T of aquation resistivity minimum value
min, measure the presetting period T under its normal consistency by Vicat apparatus method simultaneously
v-initial, final setting time T
v-final, by ρ
minrespectively to T
v-initial-T
minand T
v-final-T
minbe figure, obtain lowest resistivity ρ as shown in Figure 3
minwith presetting period T
initialwith lowest resistivity time T
minthe relation of difference, and lowest resistivity ρ as shown in Figure 4
minwith final setting time T
finalwith lowest resistivity time T
minthe relation of difference.
From Fig. 3 and Fig. 4, ρ
minwith T
v-initial-T
min, T
v-final-T
minlinear, for the presetting period:
f(ρ
min)＝165.95×ρ
min-22.424 (5)
The computing formula in presetting period can be obtained:
T
initial＝T
min+165.95×ρ
min-22.424 (6)
For final setting time:
f(ρ
min)＝174.24×ρ
min+31.315 (7)
The computing formula of final setting time can be obtained:
T
final＝T
min+174.24×ρ
min+31.315 (8)
Embodiment 5
The measurement jelling time that the embodiment of the present invention provides and the presetting period that the apparatus and method of final setting time obtain and final setting time, the presetting period recorded with existing Vicat apparatus method and final setting time compare.
Fig. 5 is the presetting period T utilizing embodiment of the present invention assay method to record
r-initialthe presetting period T recorded with Vicat apparatus method
v-initialcorrelativity figure.Fig. 6 is the final setting time T utilizing embodiment of the present invention assay method
r-finalthe final setting time T recorded with Vicat apparatus method
v-finalcorrelativity figure.
As can be seen from Fig. 5 and Fig. 6, good relationship setting time that resistivity method and Vicat apparatus method record, the accuracy that this explanation resistivity method surveys setting time is fine.
Embodiment 6
Adopt Vicat apparatus method to three presetting periods and the final setting time of measuring cement to be measured respectively, first time, measuring position was in the scope apart from circle mould 10mm ~ 20mm; Second time measuring position is in the scope apart from circle mould 10mm; Measuring position was a bit in the scope apart from circle mould 10mm ~ 20mm, a bit in the scope apart from circle mould 10mm third time; Survey be normal consistency setting time under carry out, measurement result is as shown in table 1.
The setting time that table 1 Vicat apparatus method records at circle mould diverse location
As shown in Table 1: even if under same normal consistency, nuclear power cement setting time is surveyed by Vicat apparatus method, the position of circle mould is different, and the presetting period made maximum difference is 25 minutes (see sample F), and the maximum difference of final setting time reaches 1 hour (see sample F).
The setting time that the mensuration jelling time of table 2 embodiment of the present invention and the method for final setting time record
As shown in Table 2: it is very little that the mensuration jelling time of the embodiment of the present invention and the method for final setting time measure nuclear power cement setting time error, the survey nuclear power jelling time only error (see sample B and E) of 2 minutes, surveys final setting time only 5 minutes errors (see sample B).
From the present embodiment, the setting time that the mensuration jelling time of the embodiment of the present invention and the method for final setting time measure cement than Vicat apparatus method has higher degree of accuracy.
Embodiment 7
The repeatability of the presetting period that the present embodiment is measured the apparatus and method of mensuration jelling time provided by the invention and final setting time and final setting time is described.
The change in resistance curve of the same cement adopting the device of two different mensuration jelling times and final setting time to record under the same conditions as shown in Figure 7.As seen from Figure 7, the repeatability of the mensuration jelling time of the embodiment of the present invention and the method for final setting time is good, the result recorded can not change to some extent because of operating personnel, instrument difference, as long as condition is identical, resistivity--time curve almost can overlap, and the transfer ability of data recorded is strong.And Vicat apparatus method survey cement setting time repeats poor, the setting time recorded in different positions is different, and therefore the repeatability of electric-resistivity method is better than Vicat apparatus method.
Embodiment 8
Jelling time under Vicat apparatus method bioassay standard denseness water requirement and final setting time, die trial is needed to put into curing box during measurement, carry out first time mensuration after adding water 30 minutes, the time that test point is drowned into apart from base plate 4 ± 1mm is the presetting period, surveys once when closing on initial set every 5 minutes; To reverse after initial set die trial, change the final set special needle being provided with annular attachment, survey once every 15 minutes close to during final set, the time of test point being sunk to examination body≤0.5mm is final setting time.
In the mensuration jelling time that the embodiment of the present invention provides and the apparatus and method of final setting time, only need after cement and water mixing, carry out simple craft or mechanical raking 31, make annular cement sample, annular cement sample is put into secondary coil placement portion 32, and measurement mechanism just can be measured automatically, measures simple to operate, manual processing links is few, processing time is few, and step is far fewer than Vicat apparatus method, and the result repeatability obtained and accuracy also will be far superior to existing Vicat apparatus method.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. measure a device for jelling time and final setting time, it is characterized in that, comprising:
Instrument of Electrical Resistivity Measurement, for determining the minimum specific resistance value of cement in hydration process and the hydrated cementitious time corresponding with minimum specific resistance value;
First data processing equipment, is connected with described Instrument of Electrical Resistivity Measurement, for the minimum specific resistance value that determines according to described Instrument of Electrical Resistivity Measurement and the hydrated cementitious time corresponding with minimum specific resistance value, obtains presetting period and the final setting time of cement.
2. the device of mensuration jelling time according to claim 1 and final setting time, is characterized in that, described Instrument of Electrical Resistivity Measurement comprises:
Signal generation apparatus;
Primary coil, is connected with described signal generation apparatus, makes described primary coil produce alternating voltage by described signal generation apparatus;
Iron core, is equipped with described primary coil, for responding to the exchange current of described primary coil to produce alternating magnetic field;
Secondary coil placement portion, is equipped with described iron core, for settling the secondary coil of the ring-type be made up of cement sample to be measured, makes described secondary coil under action of alternating magnetic field, produce loop voltag V and circular current I;
Voltage measuring device, for measuring the loop voltag V in secondary coil;
Current-flow test set, for measuring the circular current I in secondary coil;
Timer, records the hydration time of cement sample to be measured;
Second data processing equipment, be connected with described voltage measuring device, current-flow test set and timer respectively, for calculating the resistivity of the cement sample to be measured of different hydration time, and then obtain the minimum specific resistance of cement sample to be measured in hydration process and the hydration time corresponding to minimum specific resistance.
3. the device of mensuration jelling time according to claim 2 and final setting time, it is characterized in that, described Instrument of Electrical Resistivity Measurement also comprises amplifier, described amplifier is connected with described signal generation apparatus and described primary coil respectively, amplifies for the signal described signal generation apparatus being sent to primary coil.
4. the device of mensuration jelling time according to claim 2 and final setting time, is characterized in that, described first data processing equipment, the second data processing equipment are same data processing equipment.
5. the device of mensuration jelling time according to claim 2 and final setting time, is characterized in that, described secondary coil placement portion is the housing of ring-type; The housing of described ring-type is sleeved on described iron core;
The housing of described ring-type is provided with upper cover, to be placed in the housing of described ring-type by annular cement sample to be measured.
6. the device of mensuration jelling time according to claim 1 and final setting time, is characterized in that, described first data processing equipment goes out the presetting period of cement according to following formulae discovery:
T
initial＝T
min+165.95×ρ
min-22.424；
Wherein: T
initialfor the presetting period of cement; T
minfor the hydration time of cement when minimum specific resistance; ρ
minfor cement minimum specific resistance;
Described first data processing equipment goes out the final setting time of cement according to following formulae discovery:
T
final＝T
min+174.24×ρ
min+31.315；
Wherein: T
finalfor the final setting time of cement, T
minfor setting time during lowest resistivity; ρ
minfor cement lowest resistivity.
7. measure a method for jelling time and final setting time, it is characterized in that, comprise the steps:
Determine the minimum specific resistance value of cement sample to be measured in hydration process and the hydration time of cement sample to be measured when minimum specific resistance;
Presetting period and the final setting time of cement to be measured is obtained according to the minimum specific resistance value of cement sample, the cement sample to be measured hydration time when minimum specific resistance.
8. the method for mensuration jelling time according to claim 7 and final setting time, is characterized in that, goes out the presetting period of cement according to following formulae discovery:
T
initial＝T
min+165.95×ρ
min-22.424；
Wherein: T
initialfor the presetting period of cement; T
minfor the hydration time of cement when minimum specific resistance; ρ
minfor cement minimum specific resistance.
9. the method for mensuration jelling time according to claim 7 and final setting time, is characterized in that, goes out the final setting time of cement according to following formulae discovery:
T
final＝T
min+174.24×ρ
min+31.315；
Wherein: T
finalfor the final setting time of cement, T
minfor setting time during lowest resistivity; ρ
minfor cement lowest resistivity.
10. the method for mensuration jelling time according to claim 7 and final setting time, it is characterized in that, adopt the Instrument of Electrical Resistivity Measurement described in any one of claim 1-6 to determine the minimum specific resistance value of cement sample to be measured in hydration process and the hydration time of cement sample to be measured when minimum specific resistance.
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| CN110361600A (en) * | 2019-07-03 | 2019-10-22 | 东南大学 | The measuring device and method of change in resistance in unsaturation concrete transmission process |
| CN110376251A (en) * | 2019-07-03 | 2019-10-25 | 东南大学 | Under stress in concrete transmission process change in resistance measuring device and method |
| CN110361600B (en) * | 2019-07-03 | 2021-09-07 | 东南大学 | Device and method for measuring resistivity change in unsaturated concrete transmission process |
| CN110749626A (en) * | 2019-10-29 | 2020-02-04 | 西南石油大学 | Device and method for measuring initial and final setting time of cement paste at high temperature and high pressure |
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