CN105372148B - A kind of dry-mixed mortar cellulose ether water retention test method - Google Patents
A kind of dry-mixed mortar cellulose ether water retention test method Download PDFInfo
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- CN105372148B CN105372148B CN201510681646.5A CN201510681646A CN105372148B CN 105372148 B CN105372148 B CN 105372148B CN 201510681646 A CN201510681646 A CN 201510681646A CN 105372148 B CN105372148 B CN 105372148B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- 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
Abstract
The invention discloses a kind of dry-mixed mortar cellulose ether water retention test methods, experimental facilities uses less, it is easy to operate, so as to obtain more test temperature and ongoing change, more really simulate the environment of practical application, closer to field condition, and then it is capable of the high-temp water-preserving rate ongoing change difference of more system judge cellulose ether.Since the acquisition of experimental data is relatively easy, so as to more comprehensively judge water retention ongoing change difference of the different cellulose ethers in different addition quantity, varying environment, more reasonably guidance, reference function can be played to the selection of cellulose ether, volume in formula designs.
Description
Technical field
The present invention relates to a kind of dry-mixed mortar cellulose ether water retention test methods.
Background technology
In dry-mixed mortar, cellulose ether is one of essential additive.When adding cellulose ether in dry-mixed mortar
Afterwards, it can make the cement mortar after mix that there is very high water-retaining property and good increasing stick effect so that cement mortar is longer
Time keeps enough moisture content.In mix and work progress, water plays the work of lubricant and solvent between inorganic component
With, therefore thin layer mortar can just be combed, plastering mortar can just be paved with trowel.Mortar in work progress simultaneously
Since water-retaining property increases after addition cellulose ether, hygroscopic wall or Ceramic Tiles need not prewet, while greatly change
It has been apt to the workability and application property, promotion hydrated cementitious of mortar, has effectively improved the adhesion strength of mortar product.
The water-retaining property of cellulose ether and mortar using when construction temperature have much relations.In the application of actual material,
Mortar is often constructed under conditions of high temperature (be higher than 35 DEG C), the temperature of for example various walls itself of the base material constructed at this time also compared with
It is high（The especially wall of summer direct sunlight, temperature is even up to 60 DEG C -70 DEG C）, there is the progress in the case of solarization such as summer
Situations such as exterior wall putty, plastering, tiling construction operation.Due to the double influence of weather and base material, make under the water retention of mortar
Drop causes dehydration too fast and influences the aquation of cement, and then makes the strength reduction of mortar, at the same application property and splitting resistance all by
To influence, thus the water retention property of cellulose ether at high temperature will be fully considered in this case.
The evaluation of existing producer or user to cellulose ether water retention property in mortar, mainly by test room temperature
Under the conditions of water retention judge.Use two methods substantially at present, i.e. 6.12 water retentions are surveyed in standard JG/T 2190-2013
Method for testing（Vacuum takes out leakage method）；And 7 water retention tests in JGJ/T 70-2009（Filter paper method）.
It is to be operating process complexity, artifical influence factor one of the shortcomings that recorded two methods in the above specification
Greatly.Second is that auxiliary material used is more, using many non-standard substances, the stability and accuracy of data can be seriously affected.Third, vacuum
It is to force the moisture content in suction mortar by using negative pressure and filter paper to take out leakage method, poor with the practical situations of dry-mixed mortar
It is different big.Fourth, due to being influenced by first three defect, all test conditions are all based in code test environment, temperature（23
±2）DEG C, relative humidity（50±5）% does not consider influence of the variation of ambient temperature to water retention in practical application.Fifth, two kinds of surveys
Method for testing does not all consider influence of the ongoing change to water retention.
Such as Chinese patent literature CN102645389A discloses a kind of detection of hydroxypropyl methyl cellulose water retention property
Method is the Typical Representative of filter paper method, it is seen that, there are the drawbacks described above of foregoing filter paper method.
For another example Chinese patent literature CN103304183B, the test method employed in specification specific embodiment is day
This standard JISA6904-1976, specific method are that the component that will be given is mixed with the cellulose ether of water-retaining agent and is added to dry powder sand
In slurry, when experiment, will add the mortar that water is stirred to fill up Buchner funnel, and vacuum pump is then used to force to carry out water retention test.It is aobvious
So at least using experiment material Preparation equipment, mixing plant, Buchner funnel, bottle,suction, vacuum pump etc. uses equipment for entire test
More, operation is cumbersome, and uses vacuum（Negative pressure）Coordinate filter paper, the practical situations comparison in difference with dry-mixed mortar
Greatly.
The water-retaining property of cellulose ether is gradually reduced with the raising of temperature, and in practice of construction, dry-mixed mortar is frequent
It can be under higher temperature, as summer outdoor temperature can reach 35 DEG C or more, and there is also temperature height, relative humidity in the north
The power of low more adverse circumstances, the at this time water retention of cellulose ether in such circumstances, that is, water lock function, moisture content in mortar
The rate of drain evaporation directly affects the application property, operable time and adhesion strength of mortar.In JG/T 2190-2013
High-temperature behavior is assessed simply by the gelling temp of cellulose ether aqueous solution point, it is clear that single data are not in 6.10 appendix Cs
It is enough full assessment its actual performance.
Invention content
In view of this, the purpose of the present invention is to provide a kind of dry-mixed mortar cellulose ether water retention test method, with
Simplify water retention testing procedure and used equipment, and reduces the influence of human factor.
The present invention uses following technical scheme：
A kind of dry-mixed mortar cellulose ether water retention test method, includes the following steps：
1）Given component mixing is placed on temperature to be 23 ± 2 DEG C, place under the standard environment of relative humidity 50 ± 5%,
Status adjustment is carried out, powder is formed；
2）The powder is added into water mix, forms mix；
3）Multiple band bottoms container is taken, fills the mix in 30s respectively, and weighs the quality of testpieces in 15s；
Wherein testpieces refers to fills the part formed after mix with bottom container；
4）It is made after testpieces in 15s and is divided into testpieces multigroup, one group is positioned over the standard environment, at least two groups
Two demarcated with different temperatures and different temperatures are respectively placed in higher than in the environment of standard ambient temperature；
5）A step 4 is measured at interval of given time period）The quality for the testpieces being grouped obtains each testpieces and exists
Quality under corresponding time point；
6）According to time point and the corrresponding quality under time point and step 3）In testpieces Mass Calculation go out difference
Under environmental condition in different time points under water retention.
Above-mentioned dry-mixed mortar cellulose ether water retention test method, optionally, step 4）Get the bid quasi and higher than mark
The environment of quasi temperature is constructed by drying box.
Optionally, step 5）In the time of measuring of each testpieces quality is taken out from drying box to being put into drying box not
More than 30s.
Optionally, in addition to standard environment, step 4）The temperature demarcated at least further includes 40 DEG C and 60 DEG C.
Optionally, use reference cement as the binding material of dry-mixed mortar in given component.
Optionally, it is 1.0mm square hole screens that iso standard riddled sand, sieve used are used in given component.
Optionally, the water in mix：Powder=1:5.
Optionally, water is drinking pure water, and water temperature is 23 ± 2 DEG C.
Optionally, band bottom container is the cylinder barrel-like structure of stainless steel, and bucket inside dimension is φ 120mm ╳ 5mm,
And its base plate thickness is not less than 2mm, wall thickness is not less than 1mm.
Optionally, given time interval is 20min.
According to the present invention, test data can intuitively show different cellulose ethers, different addition quantity, non-equality of temperature very much
The water retention variation of cellulose ether when spending, regularity is stronger, and the stability of data is good, facilitates and judges cellulose ether not
With water retention when environment temperature, different cellulose ethers is best in the operable time and mortar to judge out mortar
Volume etc..
Description of the drawings
Fig. 1 is low-dosage dry-mixed mortar cellulose ether 0min construction effect figures in comparative example 1（Experimental field photo）.
Fig. 2 is construction effect figure after low-dosage dry-mixed mortar cellulose ether 20min in comparative example 1（Experimental field shines
Piece）.
Fig. 3 is low-dosage dry-mixed mortar cellulose ether high additive 0min construction effect figures in comparative example 1（Experimental field shines
Piece）.
Fig. 4 is construction effect figure after low-dosage dry-mixed mortar cellulose ether high additive 20min in comparative example 1（Experiment is existing
Field photo）.
Specific implementation mode
Environment temperature when according to the present invention, using more scientific construction simulation is basic ideas, to so that experimental situation
It is intuitive to show water retention variation of the different cellulose ethers in different addition quantity in mortar closer to field condition.
Standard environment of the present invention refers to 23 ± 2 DEG C of temperature, and relative humidity 50 ± 5% constitutes the outer of water retention test
Portion's environment, all test operations all carry out under standard environment., it should be understood that external environment here is not related in used equipment
Subenvironment restriction.
Building material industry standard JC 477-2005《Gunite concrete accelerator》Regulation, detection ordinary water-reducing agent WR, height
Imitate water-reducing agent HWR, high-performance water reducing agent HPWR, gas tracting subtractive agent AEWR, early strength agent Ac, retarder Re, air entraining agent AE, pumping admixture
17 kinds of concrete admixtures such as PA, waterproofing agent, swelling agent, accelerator, mineral additive must use reference cement.Highway, iron
Road is built in the professional standards such as work, harbor work and is also provided, concrete admixture inspection need to use reference cement.
Reference cement is widely provided in National Standard of the People's Republic of China GB 8076-2008《Concrete admixture》、
GB 23439-2009《Cement expansive material》、GB /T 18736-2002《Mineral admixture for high-strength high-performance concrete》, build
Material professional standard JC 474-2008《Mortar, concrete waterproofer》, building material industry standard JC 475-2004《Concrete is antifreeze
Agent》In.
Reference cement is by Portland clinker tricalcium silicate, dicalcium silicate, tricalcium aluminate, and tetra calcium aluminoferrite adds stone
After cream it is levigate made of strength grade be more than 42.5 portland cement, be not spiked with any mixing material.
Known to description based on background technology：One of the shortcomings that recorded two methods it is to be operating process in specification
Complexity, artifical influence factor are big.Second is that auxiliary material used is more, using many non-standard substances, the stability of data can be seriously affected
With accuracy.Third, it is to force the moisture content in suction mortar by using negative pressure and filter paper that vacuum, which takes out leakage method, with dry-mixed sand
The practical situations difference of slurry is big.Fourth, due to being influenced by first three defect, all test conditions are all based on standard
In experimental enviroment, temperature（23±2）DEG C, relative humidity（50±5）% does not consider that variation of ambient temperature is to water conservation in practical application
The influence of rate.Fifth, two kinds of test methods all do not consider influence of the ongoing change to water retention.Based on this with given reality
It applies example and illustrates the present invention.
The present invention relates to dry-mixed mortar cellulose ether water retention test methods, and its component is made with one embodiment
Go out explanation, foreseeable, the dry-mixed mortar that those skilled in the art can be used for other components accordingly is retained with cellulose ether
The test of rate.
In one embodiment, key component includes：
450 ± 2 g of reference cement
1350 ± 5g of iso standard riddled sand
Cellulose ether 0.9-5.4g.
The dry-mixed mortar cellulose ether water retention test method of said components is included the following steps：
Step 1）, first said components be sufficiently mixed be placed on temperature be 23 ± 2 DEG C, relative humidity 50 ± 5%
It is placed under standard environment, carries out status adjustment, form powder.
The time of placement is with 48h（Hour）It is advisable, in favor of the abundant adjusting of state.
Step 2）, by step 1）Obtained powder adds water to mix and stir, by water：Powder=1：5 mode adds water, uses JJ-5 types
Glue sand agitator carries out mix, and duration of mixing is in 200s（Second）It is advisable, preferably 210s, it is uniform to be allowed to mix, forms mix.
1:The mix consistency that 5 gouache ratio obtains is proper, disclosure satisfy that the required viscosity of Construction State.To the greatest extent
Pipe cannot represent the consistency under all actual conditions, but pass through long-term comparison and screening, it is found that the gouache ratio is real to production
It tramples with good directive function.
Step 3）, the container at multiple band bottoms is taken, is integrally a kind of shape of ware, under conditions of meeting splendid attire mix,
With larger exposed area, there is bigger bonded area with air in other words.
Multiple containers are identical container（It is denoted as a batch）, it is identical in quality or essentially identical, select the appearance of same type
Device.Its quantity can configure same number container, or each temperature is set according to applied temperature number is tested
One group of several container is set, is averaged to obtain relatively more representational data.
Container can select glass dish or stainless steel ware, quality to be easy to control, to ensure the consistency of quality.
Container is as previously described ware, is substantially a kind of short drum, it is preferable that bucket inside dimension is φ 120mm ╳ 5mm, and
Its base plate thickness is not less than 2mm, and wall thickness is not less than 1mm.That is, bucket interior diameter is 120mm, it is highly 5mm, forms ware.
When test, for each container mix is filled up with scraper in 30s, is tamped and with scraper from vessel port at scrape
It is flat（Without vibration）, testpieces is so made.
After testpieces makes, completion quality weighing that should be as fast as possible, preferably in 15s simultaneously with electronic balance weighing
Record.
Step 4）, according to environment temperature to be determined, a batch of container is divided into corresponding group number, it should be understood that
This group of number is to prepare in advance, prevents take up the time in experimentation.
Then, it is assumed that use three temperature spots, and testpieces is positioned in corresponding environment as early as possible.
Such as standard environment is respectively placed in 15S（Temperature（23±2）DEG C, relative humidity（50±5）%）, temperature has been set
It spends for the air dry oven of 40 DEG C, 60 DEG C（Open air blower）It is tested in three kinds of different environmental conditions, when whole operation
Between must not exceed 60s.
Using drying box ensureing the relative stability of constructed artificial environment, the steaming that wherein air blower is used to evaporate
Vapour is taken away.
And these three temperature spots have relatively good representativeness, such as summer surface temperature can reach 60 DEG C.
Different from both known test method, based on the test method of the present invention, setting is easy by air dry oven
Temperature, therefore, it is possible to be tested under different temperature conditions, without too big cost.
Step 5）, the quality of container and wet mortar is weighed and recorded at interval of 20min, records 6 time points respectively, altogether
120min。
In addition, more time point is conducive to make plot of water cut for example above-mentioned to stablize relatively, by non-experimental situation shadow
Sound is smaller, such as may result in it from taking-up in drying box every time and store the regular hour in testing external environment temperature to shadow
Ring the relative precision of experimental data.
In view of this, under conditions of meeting quality measurement time abundance relatively, reduced as far as possible to experiment process
Interference is taken out and weighs and be put into the time in baking oven preferably no more than 30s every time thus.
Quality under recording each testpieces at the time point as parameter using time point.
Step 6）, according to time point and the corrresponding quality under time point and step 3）In testpieces Mass Calculation
Water retention under going out under the conditions of varying environment in different time points.
Above-mentioned water retention calculation formula is：
X%={ 1-（m2- m3）/[（m2- m1）╳ 0.167] } × 100%
Wherein：m1For the quality of rustless steel container；
m2For before experiment when 0min wet mortar and rustless steel container quality；
M3 is the quality of wet mortar and rustless steel container after weighing each period；
0.167 in formula is the weight ratio shared by water in wet mortar.
Result of calculation takes the arithmetic mean of instantaneous value of test result twice, is accurate to 0.01%.
About said components, using the preparation method of iso standard riddled sand：By iso standard sand by 1.0mm square hole screens into
The coarse sand that grain size is more than 1.0mm is rejected in row screening, is taken 1.0mm fine sands below and is sufficiently mixed uniformly.
Above-mentioned experimental water is the drinking water of cleaning, preferable using pure water, and water temperature needs accurately control, and water temperature is wanted
Ask 23 ± 2 DEG C.
Above-mentioned electronic balance used requires class of accuracy to be not less than II grade, and minimum division value d is not more than 0.01g, maximum
Weighing value is not less than 2000g, to ensure the accuracy measured.
Above-mentioned air dry oven requires to can be automatically controled temperature, precision ± 1 DEG C.
The requirement of above-mentioned whipping process, weighs a certain amount of water and pours into and meet in agitated kettle as defined in GB/T 17671, then
Benchmark mortar or experiment mortar is added, agitated kettle is placed on the fixed position on fixed frame；Blender, stirring at low speed are started immediately
Stop to mix 90 s after 1 min, wipe the mortar being adhered on paddle and agitated kettle inner wall off with perching knife, perching knife hand operated mixing is used in combination
Three times, it is piled up among agitated kettle, then 1 min of stirring at low speed stops again.After shutdown, by agitated kettle from blender
On take down, mortar with perching knife stir 10 times, it is spare.
The calculation formula of this water retention is based on the moisture content for ignoring mortar itself（Usually less than 1%）, only consider that mortar stirs
The water being added when mixing shows water retention by the surplus after calculating the volatilization and loss of different time sections water be added
Difference, this result is more easy-to-understand.
Data comparison
Different cellulose ethers under different addition quantity, test result is as follows for the percentage of water loss of different temperature points：
Sample 1：100000 viscosity HEMC.
Sample 2：80000 viscosity HPMC.
Sample 3：7.5 ten thousand viscosity HPMC.
Table 1：The water retention of leakage method and filter paper method test is taken out using vacuum
Remarks：1,0.12% cellulose ether additive amount as defined in leakage method and filter paper method is taken out for vacuum；
2, test result vacuum take out leakage law regulation be accurate to 1%, filter paper law regulation is accurate to 0.1%, in order to more preferably with this survey
Method for testing compares, and water retention test result is uniformly accurate to 0.01%.
As it can be seen from table 1 being limited by vacuum pumping leakage method and filter paper method itself characteristic of experiment, purpose is intended merely to obtain
A single numerical value is obtained, thus takes out leakage method and filter paper method dependent on vacuum not obtaining multiple time points guarantors in one experiment
Water rate data, that is, the water conservation rate score obtained can only be the water conservation rate score obtained according to standard operation, to actual production
Guidance deduced dependent on obtained water conservation rate score, without considering actual construction environment.Inventor thinks institute's table in table 1
The water retention shown lacks environment temperature and the ongoing change of water retention these key parameters, and effectively scene cannot be instructed to apply
Work.
Table 2：Ongoing change of the mortar in different temperature points water retention of cellulose ether is not mixed
Predictably according to table 2, when the temperature of the surroundings is low, mortar can have relatively good in a longer period of time
Water retention, such as when environment temperature is 23 DEG C, through when 120min still have relatively high water retention, batch scraped so as to meet
It is required that.However, when environment temperature is not normal temperature, such as when environment temperature is 40 DEG C, water retention when 20min is just
Less than 80%, thus, influenced by site operation environment, for example, filter paper method and vacuum filtration method code test because of it not
Consider site environment temperature and the situation of water retention ongoing change, thus effective construction guidance cannot be provided.
Table 2 is to disclose most points by ongoing change using the water retention test method of the present invention（Water retention-time and
Temperature）The necessity of sampling.From the point of view of table 2 shows never to mix the mortar water retention of cellulose ether, guarantor of the environment temperature to wet mortar
Water rate influences clearly.Water retention at 60 DEG C compares 40 DEG C preferably, is because being not added with fibre in ratio of water to material, mortar thus
When dimension element ether, the wet mortar after stirring has obviously bleeding through placing, in 60 DEG C of relatively high environment temperature, mortar
The water that the secreting of surface can plug the hole on surface to a certain degree by rapid evaporation to make mortar surface form hard shell,
The water evaporation inside mortar is caused to slow.
To which, table 2 shows to be not offered as that environment temperature is higher, the water retention of mortar will be poorer, thus conventional deduction
It can not effectively predict the water retention situation of mortar under actual working conditions.Experimental data recorded in the table 2 is it is found that temperature
The influence changed to water retention is not simple linear change.
Table 3- tables 5 with reference to table 2, and hereinafter illustrate the relationship of water retention and cellulose ether volume.
Table 3：The ongoing change of different temperature points water retention when different cellulose ether volumes are 0.05%
Table 2- tables 5 are the experimental data using water retention test method of the present invention, every 20 minutes data points, from table
It can understand and intuitively find out the operable time section of the mortar of different cellulose ether volumes, such as be with 80% water retention
Basic point, to, based on the present invention can more preferable simulation actual condition, accurately obtain mortar grasping at different temperatures
Make the time, so as to preferably instruct actual production.
Table 4：The ongoing change of different temperature points water retention when different cellulose ether volumes are 0.12%
Table 5：The ongoing change of different temperature points water retention when different cellulose ether volumes are 0.30%
By table 2-5 it is found that since operating process is relatively easy, used auxiliary material is few, and each group of experiment is required
Test period do not need to it is too long can obtain under the conditions of cellulose ether different addition quantity can application property, so as to more comprehensively
Judge water retention ongoing change difference of the different cellulose ethers in different addition quantity, varying environment.Thus, it is more advantageous to screening not
The optimum mix amount of cellulose ether under the conditions of synthermal.Scene can directly be looked into according to environment temperature and required operable time
Table determines required cellulose ether addition content, such as construction temperature is 23 DEG C, is even not spiked with cellulose ether, mortar is applied
Work is maintained to longer time.And when temperature is higher, such as at 60 DEG C, need to add more cellulose ether with
Ensure the operable time of mortar.
Consolidated statement 2- tables 5, it is seen that, test method according to the present invention can be in the design of mortar formula to cellulose ether
Selection, volume can play more reasonably guidance and reference function.
In addition, with operable time defined by moisture content, such as with moisture content 80% it is fundamental node, at the node,
Obtained moisture content is can be seen that by table 3-5 relatively to stablize.And for known two methods, although being all mark
Accurate test method, but it show that moisture content difference is bigger.
Comparative example：
Under practical outdoor high temperature environment, contrast test mixes the application property and adhesion strength of cellulose ether mortar, to judge
The water-retaining property of different addition quantity cellulose ether mortar, the test method to show according to the present invention can be used for judging cellulose ether and exist
Water retention when varying environment temperature, different cellulose ethers are most in the operable time and mortar to judge out mortar
Good volume.
Embodiment：
1, implement project：Application property and adhesion strength of the contrast test decorative mortar under outdoor high temperature environment.
2, implementation environment：Beijing late July in summer：Outdoor temperature：38 ± 2 DEG C, relative humidity：Less than 30%, wind speed≤3
m/s。
3, base material：Density is 18kg/m3Polystyrene（EPS）Cystosepiment.
4, test method：Application property is judged according to practice of construction scribble effect, and adhesion strength is according to JG 149-2003《It is swollen
Swollen exterior insulation system for polyphenyl plate thin plastering exterior wall》Middle 6.3.1 regulations carry out.
Comparative example 1：
Using 3 cellulose ether of sample, volume is respectively 0.12%（40 DEG C of experimental data in corresponding table 4）With 0.30%（It is right
Answer 40 DEG C in table 5 of experimental data）It is added in decorative mortar, then adds water mix, film is carried out on base material, passes through observation
The complexity of application property and apparent effect evaluate the practical water retention otherness of cellulose ether.
When can be seen that cellulose ether compared with low-dosage (0.12%) from Fig. 1 and Fig. 2, mortar has construction of good initial stage effect
Fruit, batch mortar surface flat smooth scraped, dry rear surface intensity are high.But the mortar mixed is after outdoor placement 20min（Table
Average water retention in 4 when 20min is 87.9%）, since cellulose ether volume is relatively low, and water retention is deteriorated under hot conditions,
Mortar is dry and astringent after causing mortar dehydration too fast, and application property becomes very poor.
From figs. 3 and 4 it can be seen that since guarantor of the cellulose ether in varying environment temperature can be judged based on the present invention
Water rate, and the optimum mix amount and operable time that correctly have rated different cellulose ethers in mortar can be selected with this condition
The optimum mix amount of cellulose ether and adaptable operable time, to what is compared, cellulose ether is compared with high additive (0.30%)
When, mortar has good initial stage construction effect, batch mortar surface flat smooth scraped, and dry rear surface intensity is high.And it mixes
The mortar got togather is after outdoor placement 20min, since cellulose ether volume is higher, has good construction hot environment
Property, to be conducive to filter out under this temperature condition can the construction time, and meet can the cellulose ether of construction time mix
The optimum mix amount of amount.Visibly, as can be seen from Table 5, when cellulose ether volume is higher, sample dehydrating speed can also reduce,
It cannot be easily caused that surface is dry and cracked, to batch mortar surface flat smooth scraped, can be used for effective Instructing manufacture.
To sum up：
The water retention of leakage method and filter paper method test cellulose ether is taken out using vacuum it can be seen from upper table and upper legend,
Data point is less, difference unobvious, cannot effectively obtain influence of the cellulose ether volume to practice of construction.And two methods
Between comparativity it is poor, the volume of cellulose ether is to immobilize, and cellulose ether is in mortar when cannot reflect practical application comprehensively
In to water retention influence variation.The data tested through the invention can intuitively show different cellulose ethers, no very much
The water retention variation of cellulose ether when same volume, different temperatures, regularity is stronger, and data stability is good.For existing one
Kind of cellulose ether facilitate in different addition quantity judge water retention of the cellulose ether in varying environment temperature, mortar it is operable when
Between and in mortar different cellulose ethers the optimum mix amount etc..
Claims (9)
1. a kind of dry-mixed mortar cellulose ether water retention test method, which is characterized in that include the following steps：
1）Given component mixing is placed on temperature to be 23 ± 2 DEG C, place under the standard environment of relative humidity 50 ± 5%, is carried out
Status adjustment forms powder；
2）The powder is added into water mix, forms mix；
3）Multiple band bottoms container is taken, fills the mix in 30s respectively, and weighs the quality of testpieces in 15s；Wherein
Testpieces refers to fills the part formed after mix with bottom container；
4）It is made after testpieces in 15s and is divided into testpieces multigroup, one group is positioned over the standard environment, at least two groups of difference
Two demarcated with different temperatures and different temperatures are positioned over higher than in the environment of standard ambient temperature；
5）A step 4 is measured at interval of given time period）The quality for the testpieces being grouped obtains each testpieces corresponding
Quality under time point；
6）According to time point and the corrresponding quality under time point and step 3）In testpieces Mass Calculation go out varying environment
Under the conditions of in different time points under water retention；
In addition to standard environment, step 4）The temperature demarcated at least further includes 40 DEG C and 60 DEG C.
2. dry-mixed mortar according to claim 1 cellulose ether water retention test method, which is characterized in that step 4）In
Standard environment and higher than standard ambient temperature environment be drying box constructed by.
3. dry-mixed mortar according to claim 2 cellulose ether water retention test method, which is characterized in that step 5）In
To the time of measuring of each testpieces quality taken out from drying box to be put into drying box be no more than 30s.
4. according to any mortar cellulose ether water retention test methods of claim 1-3, which is characterized in that given
Use reference cement as the binding material of dry-mixed mortar in component.
5. mortar according to claim 4 cellulose ether water retention test method, which is characterized in that in given component
Using iso standard riddled sand, sieve used is 1.0mm square hole screens.
6. according to any mortar cellulose ether water retention test methods of claim 1-3, which is characterized in that mix
Water in material：Powder=1:5.
7. mortar according to claim 6 cellulose ether water retention test method, which is characterized in that water is pure to drink
Water purification, and water temperature is 23 ± 2 DEG C.
8. according to any mortar cellulose ether water retention test methods of claim 1-3, which is characterized in that described
With the cylinder barrel-like structure that bottom container is stainless steel, bucket inside dimension is φ 120mm ╳ 5mm, and its base plate thickness is not less than
2mm, wall thickness are not less than 1mm.
9. according to any mortar cellulose ether water retention test methods of claim 1-3, which is characterized in that given
Time be 20min.
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| CN106370825B (en) * | 2016-08-17 | 2019-05-24 | 成都市易建建筑材料有限公司 | The method of easily-testing water retention |
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| CN2556634Y (en) * | 2002-08-09 | 2003-06-18 | 中国建筑材料科学研究院 | Cement water retention rate detector |
| CN102645389A (en) * | 2012-03-08 | 2012-08-22 | 南通岩艺涂装科技有限公司 | Method for testing water-retaining property of hydroxypropyl methyl cellulose |
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| EP1740513A1 (en) * | 2004-04-27 | 2007-01-10 | Hercules Incorporated | Tile cement mortars using water retention agents |
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| CN102645389A (en) * | 2012-03-08 | 2012-08-22 | 南通岩艺涂装科技有限公司 | Method for testing water-retaining property of hydroxypropyl methyl cellulose |
| CN203587465U (en) * | 2013-09-05 | 2014-05-07 | 北京金隅砂浆有限公司 | Vacuum-filtration-type mortar water-retention rate testing device |
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