CN105372148A - Method for testing water-retention rate of cellulose ether for dry-mixed mortar - Google Patents
Method for testing water-retention rate of cellulose ether for dry-mixed mortar Download PDFInfo
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 97
- 229920003086 cellulose ether Polymers 0.000 title claims abstract description 84
- 206010016807 Fluid retention Diseases 0.000 title abstract description 73
- 238000012360 testing method Methods 0.000 title abstract description 34
- 238000000034 method Methods 0.000 title abstract description 33
- 239000000203 mixture Substances 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 238000010998 test method Methods 0.000 claims description 29
- DQYBDCGIPTYXML-UHFFFAOYSA-N ethoxyethane;hydrate Chemical compound O.CCOCC DQYBDCGIPTYXML-UHFFFAOYSA-N 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000035622 drinking Effects 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 2
- 230000036962 time dependent Effects 0.000 abstract 3
- 238000009472 formulation Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 10
- 238000003756 stirring Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 239000004567 concrete Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 208000028804 PERCHING syndrome Diseases 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000010421 standard material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 235000012206 bottled water Nutrition 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 101150107144 hemC gene Proteins 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- 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
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for testing water-retention rate of cellulose ether for dry-mixed mortar, which is less in use of experiment equipment and convenient in operation, whereby being capable of obtaining more testing temperature and time-dependent behavior, being more truly simulating actual application environment, being more close to the site conditions, and being further capable of more systematacially judging high temperature water retention time-dependent behavior difference of cellulose ethers. Because experimental data is relatively easy to obtain, the method for testing the water-retention rate of the cellulose ether for the dry-mixed mortar can judge the water retention time-dependent behavior difference of different cellulose ethers in different mixing amounts and different environments in the round, and can play the guide and reference roles for selection and mixing amounts of the cellulose ethers in a formulation design.
Description
Technical field
The present invention relates to a kind of dry-mixed mortar cellulose ether water retention method of testing.
Background technology
In dry-mixed mortar, cellulose ether is absolutely necessary one of adjuvant.After adding cellulose ether in dry-mixed mortar, the sand-cement slurry after mix can be made to have very high water-retaining property and good increasing sticks effect, make sand-cement slurry keep enough moisture content in the longer time.In mix and work progress, water serves the effect of lubricant and solvent between inorganic component, and therefore thin layer mortar just can carry out combing, and motar just can pave with trowel.Simultaneously in work progress, mortar increases due to water-retaining property after adding cellulose ether, the body of wall of easy water suction or Ceramic Tiles do not need to prewet, significantly improve workability and application property, the promotion hydrated cementitious of mortar simultaneously, effectively improve the cohesive strength of mortar product.
The construction temperature when water-retaining property of cellulose ether and mortar use has much relations.In the materials application of reality; mortar often can be constructed under the condition of high temperature (higher than 35 DEG C); the base material of now constructing as the temperature of various body of wall self also higher (particularly summer direct sunlight body of wall; temperature even can reach 60 DEG C-70 DEG C), as there being the situations such as carrying out exterior wall putty, plaster in Exposure to Sunlight situation, tiling construction operation summer.Due to the double influence of weather and base material, the decline of the water retention of mortar is made to cause dehydration too fast and affect the aquation of cement, and then the intensity of mortar is reduced, application property and splitting resistance are all affected simultaneously, thus will take into full account cellulose ether water retention property at high temperature in this case.
Existing producer or user, to the evaluation of cellulose ether water retention property in mortar, are mainly judged by the water retention under test normal temperature condition.Basic employing two kinds of methods, i.e. 6.12 water retention method of testings (vacuum takes out leakage method) in standard JG/T2190-2013 at present; And 7 water retention tests (filter paper method) in JGJ/T70-2009.
One of shortcoming of two kinds of methods described in above specification is that operating process is complicated, and artifical influence factor is large.Two is that auxiliary material used is many, uses a lot of non-standard material, can have a strong impact on stability and the accuracy of data.Three is vacuum leakage methods of taking out is by adopting negative pressure and filter paper to force to aspirate the moisture content in mortar, large with the practical situations difference of dry-mixed mortar.Four is that its all test condition is all based in code test environment, temperature (23 ± 2) DEG C, relative humidity (50 ± 5) %, does not consider that in practical application, variation of ambient temperature is on the impact of water retention due to the impact by first three defect.Five is that two kinds of method of testings all do not consider the impact of rheological parameters' change with time on water retention.
Such as Chinese patent literature CN102645389A discloses a kind of detection method of hydroxypropyl methylcellulose water retention property, is namely the Typical Representative of filter paper method, visible, and it exists the above-mentioned defect of foregoing filter paper method.
For another example Chinese patent literature CN103304183B, the test method adopted in its instructions specific embodiment is Nippon Standard JISA6904-1976, concrete grammar is that the cellulose ether given component being mixed with water-loss reducer joins in dry powder and mortar, the mortar be stirred adding water during test fills up Buchner funnel, then uses vacuum pump to force to carry out water retention test.Obvious whole test at least service test material Preparation equipment, mixing plant, Buchner funnel, bottle,suction, vacuum pumps etc., use equipment many, operate cumbersome, and adopt vacuum (negative pressure) to coordinate filter paper, large with the practical situations comparison in difference of dry-mixed mortar.
The water-retaining property of cellulose ether declines gradually along with the raising of temperature; when practice of construction; under dry-mixed mortar often can be in higher temperature; as outdoor temperature in summer can reach more than 35 DEG C; and also there is temperature in the north high, the more rugged surroundings that relative humidity is low, now cellulose ether water retention in such circumstances; namely lock the power of water function, the speed that in mortar, water evaporates runs off directly affects the application property of mortar, operable time and cohesive strength.In JG/T2190-2013, just assess high-temperature behavior by the gelling temp point of cellulose ether aqueous solution in 6.10 appendix C, obviously single data deficiencies is with its actual performance of full assessment.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of dry-mixed mortar cellulose ether water retention method of testing, to simplify water retention testing procedure and institute's use equipment, and reduce the impact of human factor.
The present invention is by the following technical solutions:
A kind of dry-mixed mortar cellulose ether water retention method of testing, comprises the following steps:
1) mixing of given component is placed on that temperature is 23 ± 2 DEG C, places under the standard environment of relative humidity 50 ± 5%, carry out status adjustment, form powder;
2) by described powder blunge, mix is formed;
3) get container at the bottom of multiple band, in 30s, fill described mix respectively, and in 15s, weigh the quality of testpieces; Wherein testpieces refers to the part that band end container is formed after filling mix;
4) testpieces is divided into many groups in 15s after making testpieces, one group is positioned over described standard environment, have at least two groups be positioned over respectively two with different temperatures demarcate and this different temperatures higher than in the environment of standard ambient temperature;
5) measure the quality of the testpieces that step 4) is grouped at interval of section preset time, obtain the quality of each testpieces under corresponding time point;
6) according to time point and the respective quality under time point, and the testpieces Mass Calculation in step 3) goes out the water retention under varying environment condition under different time points.
Above-mentioned dry-mixed mortar cellulose ether water retention method of testing, alternatively, step 4) Plays environment and higher than the environment of standard ambient temperature constructed by drying box.
Alternatively, in step 5), the Measuring Time of each testpieces quality is taken out from drying box and put into drying box and be no more than 30s.
Alternatively, except standard environment, the temperature that step 4) is demarcated at least also comprises 40 DEG C and 60 DEG C.
Alternatively, use reference cement as the binding material of dry-mixed mortar in given component.
Alternatively, adopt iso standard riddled sand in given component, sieve used is 1.0mm square hole screen.
Alternatively, the water in mix: powder=1:5.
Alternatively, water is drinking pure water, and water temperature is 23 ± 2 DEG C.
Alternatively, container at the bottom of described band 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, and wall thickness is not less than 1mm.
Alternatively, the given time interval is 20min.
According to the present invention, the water retention change of cellulose ether when its test data can show different cellulose ether, different addition quantity, different temperatures very intuitively, its regularity is stronger, and the good stability of data, the water retention of convenient judge cellulose ether when varying environment temperature, thus pass judgment on out the operable time of mortar, and the optimum mix amount etc. of different cellulose ether in mortar.
Accompanying drawing explanation
Fig. 1 is low-dosage dry-mixed mortar cellulose ether 0min construction effect figure (experimental field photo) in comparative example 1.
Fig. 2 is construction effect figure (experimental field photo) after low-dosage dry-mixed mortar cellulose ether 20min in comparative example 1.
Fig. 3 is low-dosage dry-mixed mortar cellulose ether high additive 0min construction effect figure (experimental field photo) in comparative example 1.
Fig. 4 is construction effect figure (experimental field photo) after low-dosage dry-mixed mortar cellulose ether high additive 20min in comparative example 1.
Embodiment
According to the present invention, with environment temperature during more scientific construction simulation for basic ideas, thus to make experimental situation closer to field condition, show the water retention change of different cellulose ether when different addition quantity in mortar intuitively.
Standard environment of the present invention refers to temperature 23 ± 2 DEG C, relative humidity 50 ± 5%, and form the external environment condition of water retention test, all test operations all carry out under standard environment.Ying Zhi, external environment condition here do not relate to the restriction of the subenvironment in use equipment.
The regulation of building material industry standard JC477-2005 " sprayed concrete accelerating chemicals ", detects 17 kinds of concrete admixtures such as ordinary water-reducing agent WR, high efficiency water reducing agent HWR, high-performance water reducing agent HPWR, gas tracting subtractive agent AEWR, early strength agent Ac, retardant Re, air entraining agent AE, pumping admixture PA, water-proofing agent, swelling agent, accelerating chemicals, mineral additive and must use reference cement.Highway, railway, build in the industry standard such as work, harbor work and also specify, concrete admixture inspection need use reference cement.
Reference cement is defined in National Standard of the People's Republic of China GB8076-2008 " concrete admixture ", GB23439-2009 " cement expansive material ", GB/T18736-2002 " mineral admixture for high-strength high-performance concrete ", building material industry standard JC474-2008 " mortar, concrete waterproofer ", building material industry standard JC475-2004 " concrete antifreezer " widely.
Reference cement is by Portland clinker tricalcium silicate, dicalcium silicate, tricalcium aluminate, tetra calcium aluminoferrite, the portland cement that strength grade levigate after adding gypsum is greater than 42.5, not any composite material of admixture.
Description based on background technology is known: one of shortcoming of two kinds of methods described in specification is that operating process is complicated, and artifical influence factor is large.Two is that auxiliary material used is many, uses a lot of non-standard material, can have a strong impact on stability and the accuracy of data.Three is vacuum leakage methods of taking out is by adopting negative pressure and filter paper to force to aspirate the moisture content in mortar, large with the practical situations difference of dry-mixed mortar.Four is that its all test condition is all based in code test environment, temperature (23 ± 2) DEG C, relative humidity (50 ± 5) %, does not consider that in practical application, variation of ambient temperature is on the impact of water retention due to the impact by first three defect.Five is that two kinds of method of testings all do not consider the impact of rheological parameters' change with time on water retention.The present invention is illustrated based on this with given embodiment.
The present invention relates to dry-mixed mortar cellulose ether water retention method of testing, for its component, make an explanation with an embodiment, foreseeable, those skilled in the art may be used for the test of the dry-mixed mortar cellulose ether water retention of other components accordingly.
In one embodiment, key component comprises:
Reference cement 450 ± 2g
Iso standard riddled sand 1350 ± 5g
Cellulose ether 0.9-5.4g.
The dry-mixed mortar cellulose ether water retention method of testing of said components is comprised the following steps:
Step 1), is first undertaken said components that fully mixing is placed on that temperature is 23 ± 2 DEG C, places under the standard environment of relative humidity 50 ± 5%, carry out status adjustment, form powder.
The time of placing is with 48h(hour) be advisable, be beneficial to the abundant adjustment of state.
Step 2), powder step 1) obtained adds water and mixes and stirs, by water: the mode of powder=1:5 adds water, and uses JJ-5 type glue sand agitator to carry out mix, and duration of mixing is in 200s(second) be advisable, preferred 210s, makes it mix even, forms mix.
The mix denseness that the gouache ratio of 1:5 obtains is proper, can meet the viscosity required for Construction State.Although the denseness under all actual conditions can not be represented, through long-term contrast and screening, find that this gouache ratio has good directive function to production practices.
Step 3), gets the container at the bottom of multiple band, and entirety is a kind of shape of ware, under the condition meeting splendid attire mix, has larger exposed area, has larger bonded area in other words with air.
Multiple container is identical container (being designated as a batch), identical in quality or substantially identical, selects the container of same type.Its quantity, according to testing the temperature number applied, can configure a same number container, also can arrange one group of several container for each temperature, averages to obtain relatively to have more representational data.
Container can select glass dish or stainless steel ware, and quality easily controls, thus the consistance of ensuring the quality of products.
Container is ware as previously mentioned, is a kind of short drum in essence, and preferably, 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, is highly 5mm, forms ware.
During test, for mix scraper fills up, tamps and use scraper to strike off (without the need to vibration) from vessel port by each container in 30s, so make testpieces.
After testpieces makes, difficulty action accomplishment that should be fast as far as possible weighs, preferably in 15s with electronic balance weighing and record.
Step 4), according to environment temperature to be determined, is divided into the container of a batch and organizes number accordingly, should be appreciated that this group number is for preparing in advance, does not occupy the time in experimentation.
Then, assuming that have employed three temperature spots, and as early as possible testpieces is positioned in corresponding environment.
Such as, be positioned over standard environment respectively in 15S
(temperature (23 ± 2) DEG C, relative humidity (50 ± 5) %), set temperature be test in the different environmental baseline of the air dry oven (opening fan blower) three kinds of 40 DEG C, 60 DEG C, the whole running time must not more than 60s.
Adopt drying box in order to ensure the relative stability of constructed artificial environment, wherein fan blower is used for the steam of evaporation to take away.
Such as, and these three temperature spots have reasonable representativeness, and summer, surface temperature can reach 60 DEG C.
Be different from both known method of testings, based on method of testing of the present invention, by the easy set temperature of air dry oven, therefore, it is possible to test under different temperature conditions, and do not need too large cost.
Step 5), weighs at interval of 20min and records the quality of container and wet mortar, recording 6 time points respectively, altogether 120min.
In addition, more time point is conducive to making such as aforesaid plot of water cut relatively stable, less by non-experiment environmental impact, such as each taking-up from drying box will cause it in experiment external environment temperature, deposit the regular hour thus affect the relative precision of experimental data.
In view of this, meeting under the relatively sufficient condition of quality measurement time, reduce the interference to experiment process as much as possible, take out for this reason at every turn weigh and the time of putting into baking oven preferably no more than 30s.
Take time point as the quality of each testpieces of parameter record under this time point.
Step 6), according to time point and the respective quality under time point, and the testpieces Mass Calculation in step 3) goes out the water retention under varying environment condition under different time points.
Above-mentioned water retention computing formula is:
X%=｛1-（m
2-m
3）/[（m
2-m
1）╳0.167]｝×100%
Wherein: m
1for the quality of rustless steel container;
M
2the quality of wet mortar and rustless steel container during for testing front 0min;
M3 is the quality of wet mortar and rustless steel container after weighing each time period;
In formula 0.167 is the weight ratio in wet mortar shared by water.
Result of calculation gets the arithmetic mean of twice test findings, is accurate to 0.01%.
About said components, adopt the preparation method of iso standard riddled sand: sieved by 1.0mm square hole screen by iso standard sand, reject the coarse sand of particle diameter more than 1.0mm, get the fine sand of below 1.0mm and fully mix.
Above-mentioned experimental water is clean potable water, uses pure water better, and water temperature needs accurately to control, and water temperature requires 23 ± 2 DEG C.
Above-mentioned electronic balance used requires that class of accuracy is not less than II grade, and minimum division value d is not more than 0.01g, and maximum capacity value is not less than 2000g, to ensure the accuracy of measuring.
Above-mentioned air dry oven requires automatically to control temperature, precision ± 1 DEG C.
Above-mentioned whipping process requirement, takes a certain amount of water and pours into and meet in agitated kettle that GB/T17671 specifies, add benchmark mortar or test mortar subsequently, agitated kettle is placed on the fixed position on fixed mount; Start stirring machine immediately, stop after stirring at low speed 1min to mix 90s, wipe the mortar sticked on paddle and agitated kettle inwall with perching knife off, and with perching knife hand operated mixing three times, be piled up in the middle of agitated kettle, and then stirring at low speed 1min stops.After shutdown, taken down by agitated kettle from stirring machine, mortar perching knife stirs 10 times, for subsequent use.
The computing formula of this water retention is based on the water percentage ignoring mortar self (being usually less than 1%), only consider the water yield that mortar adds when stirring, showed the difference of water retention by the surplus after calculating volatilization that different time sections institute adds water and loss, this result is more easy-to-understand.
data Comparison
Different cellulose ether under different addition quantity, the percentage of water loss test result of different temperature points is as follows:
Sample 1:10 ten thousand viscosity HEMC.
Sample 2:8 ten thousand viscosity HPMC.
Sample 3:7.5 ten thousand viscosity HPMC.
Table 1: employing vacuum takes out the water retention that leakage method and filter paper method are tested
Remarks: 1,0.12% take out the cellulose ether addition that leakage method and filter paper method specify for vacuum;
2, test findings vacuum is taken out Lou law regulation and is accurate to 1%, and filter paper method regulation is accurate to 0.1%, and in order to better and this method of testing contrast, water retention test result is unified is accurate to 0.01%.
As can be seen from Table 1, the restriction of leakage method and filter paper method self characteristic of experiment is taken out by vacuum, its object is just in order to obtain a single numerical value, thus depend on vacuum to take out leakage method and filter paper method cannot obtain multiple time point water retention data in once experiment, namely drawn water retention numerical value can only be the water retention numerical value drawn according to standard operation, it depends on drawn water retention numerical value to the guidance of actual production and deduces, and does not consider actual construction environment.Inventor thinks that water retention represented in table 1 lacks these key parameters of rheological parameters' change with time of environment temperature and water retention, and can not effectively construct by guide field.
Table 2: the rheological parameters' change with time of mortar at different temperature points water retention not mixing cellulose ether
According to table 2 predictably, when the temperature of the surroundings is low, mortar can have reasonable water retention within the longer time, such as, when environment temperature is 23 DEG C, through time 120min still have higher water retention, thus can meet and batch scrape requirement.But, when environment temperature is not standard temperature, such as, when environment temperature is 40 DEG C, water retention during 20min is just lower than 80%, thus, by the impact of site operation environment, the code test of such as filter paper method and vacuum filtration method does not have because of it situation considering site environment temperature and water retention rheological parameters' change with time, thus can not provide guidance of effectively constructing.
Table 2 uses water retention method of testing of the present invention, discloses by rheological parameters' change with time the necessity that most point (water retention-time and temperature) samples.Table 2 shows, never mixes the mortar water retention of cellulose ether, and environment temperature on the water retention impact of wet mortar clearly.Water retention 60 DEG C time compares 40 DEG C better, when being because not adding cellulose ether in ratio of water to material, mortar for this reason, wet mortar after stirring has obviously bleeding through placing, when comparatively high ambient temperature at 60 DEG C, mortar surface secrete the water can by rapid evaporation, thus make mortar surface form duricrust, to a certain degree plug the hole on surface, cause the water velocity of evaporation of mortar inside slack-off.
Thus table 2 shows, do not represent that environment temperature is higher, the water retention of mortar will be poorer, and thus conventional deduction can not predict the water retention situation of mortar under actual working conditions effectively.From the experimental data described in table 2, temperature variation is not simple linear change on the impact of water retention.
Below in conjunction with table 2, and the relation of water retention and cellulose ether volume illustrated by table 3-table 5 hereinafter.
Table 3: the rheological parameters' change with time of different temperature points water retention when different cellulose ether volume is 0.05%
Table 2-table 5 is the experimental datas adopting water retention method of testing of the present invention, every 20 minutes data points, can know from table and find out the operable time section of the mortar of different cellulose ether volume intuitively, such as with 80% water retention for fundamental point, thus, actual condition can be simulated better based on the present invention, draw mortar operable time at different temperatures accurately, thus actual production can be instructed better.
Table 4: the rheological parameters' change with time of different temperature points water retention when different cellulose ether volume is 0.12%
Table 5: the rheological parameters' change with time of different temperature points water retention when different cellulose ether volume is 0.30%
Known by table 2-5, because operating process is relatively simple, the auxiliary material used is few, each test period required for group experiment do not need oversize just can obtain under cellulose ether different addition quantity condition can application property, thus the water retention rheological parameters' change with time difference of different cellulose ether when different addition quantity, varying environment can be passed judgment on more comprehensively.Thus, the optimum mix amount screening cellulose ether under condition of different temperatures is more conducive to.On-the-spot environmentally temperature and required operable time table look-at can determine required cellulose ether addition content, such as construction temperature is 23 DEG C, even if not adding of fiber element ether, the application property of mortar still can keep the longer time.And when temperature is higher, such as 60 DEG C time, need to add more cellulose ether to ensure the operable time of mortar.
Consolidated statement 2-table 5, visible, can the selection of cellulose ether, volume can be played and more reasonably be instructed and reference function in mortar formula Design according to method of testing of the present invention.
In addition, the operable time limited with water percentage, such as with water percentage 80% for fundamental node, at this Nodes, by table 3-5 can find out, the water percentage drawn is relatively stable.And for known two kinds of methods, although be all the method for testing of standard, it show that water percentage difference is larger.
comparative example:
Under actual outdoor high temperature environment, contrast test mixes application property and the cohesive strength of cellulose ether mortar, judge the water-retaining property of different addition quantity cellulose ether mortar, in order to show to can be used for passing judgment on the water retention of cellulose ether when varying environment temperature according to method of testing of the present invention, thus pass judgment on out the operable time of mortar, and the optimum mix amount of different cellulose ether in mortar.
Embodiment:
1, project is implemented: the application property of contrast test decorative mortar under outdoor high temperature environment and cohesive strength.
2, implementation environment: Beijing late July in summer: outdoor temperature: 38 ± 2 DEG C, relative humidity: be less than 30%, wind speed≤3m/s.
3, base material: density is 18kg/m
3polystyrene (EPS) cystosepiment.
4, method of testing: application property is passed judgment on according to practice of construction scribble effect, cohesive strength is carried out according to 6.3.1 regulation in JG149-2003 " expansion joints bellows external thermal insulation system ".
Comparative example 1:
Adopt sample 3 cellulose ether, volume is respectively the experimental data of in the corresponding table 4 of 0.12%(40 DEG C) and 0.30%(correspondence table 5 in the experimental data of 40 DEG C) add in decorative mortar, then blunge, base material carries out film, is evaluated the actual water retention otherness of cellulose ether by the complexity and apparent effect of observing application property.
As can be seen from Fig. 1 and Fig. 2, cellulose ether comparatively low-dosage (0.12%) time, mortar has good initial stage construction effect, and the mortar surface flat smooth batch to scrape, dry rear surface intensity is high.But the mortar mixed is (the average water retention in table 4 during 20min is 87.9%) after outdoor placement 20min, because cellulose ether volume is lower, and under hot conditions, water retention is deteriorated, and cause the too fast rear mortar of mortar dehydration dry and astringent, application property becomes very poor.
As can be seen from Fig. 3 and Fig. 4, owing to can pass judgment on the water retention of cellulose ether when varying environment temperature based on the present invention, and correctly have rated the optimum mix amount and the operable time of different cellulose ether in mortar, with this understanding, the optimum mix amount can selecting cellulose ether and the operable time adapted, thus contrasted, cellulose ether comparatively high additive (0.30%) time, mortar has good initial stage construction effect, criticize the mortar surface flat smooth scraped, dry rear surface intensity is high.And the mortar mixed is after outdoor placement 20min, because cellulose ether volume is higher, even if hot environment also has good application property, thus be conducive to filtering out under this temperature conditions can the engineering time, and meet can the optimum mix amount of cellulose ether volume of engineering time.Visibly, as can be seen from Table 5, when cellulose ether volume is higher, sample dehydrating speed also can reduce, and is not easy to cause surface dry and cracked, thus batch mortar surface flat smooth scraped, can be used for effective Instructing manufacture.
To sum up:
As can be seen from upper table and upper legend, adopt vacuum to take out leakage method and filter paper method and test the water retention of cellulose ether, its data point is less, and difference is not obvious, effectively can not draw the impact of cellulose ether volume on practice of construction.And between two kinds of methods, comparability is poor, and the volume of its cellulose ether immobilizes, when can not reflect practical application, cellulose ether changes the impact of water retention in mortar comprehensively.The water retention change of cellulose ether when the data of being tested by the present invention can show different cellulose ether, different addition quantity, different temperatures very intuitively, its regularity is comparatively strong, and data stability is good.For existing a kind of cellulose ether when different addition quantity convenient pass judgment on cellulose ether in varying environment temperature time water retention, mortar operable time and in mortar the optimum mix amount etc. of different cellulose ether.
Claims (10)
1. a dry-mixed mortar cellulose ether water retention method of testing, is characterized in that, comprise the following steps:
1) mixing of given component is placed on that temperature is 23 ± 2 DEG C, places under the standard environment of relative humidity 50 ± 5%, carry out status adjustment, form powder;
2) by described powder blunge, mix is formed;
3) get container at the bottom of multiple band, in 30s, fill described mix respectively, and in 15s, weigh the quality of testpieces; Wherein testpieces refers to the part that band end container is formed after filling mix;
4) testpieces is divided into many groups in 15s after making testpieces, one group is positioned over described standard environment, have at least two groups be positioned over respectively two with different temperatures demarcate and this different temperatures higher than in the environment of standard ambient temperature;
5) measure the quality of the testpieces that step 4) is grouped at interval of section preset time, obtain the quality of each testpieces under corresponding time point;
6) according to time point and the respective quality under time point, and the testpieces Mass Calculation in step 3) goes out the water retention under varying environment condition under different time points.
2. dry-mixed mortar cellulose ether water retention method of testing according to claim 1, is characterized in that, step 4) Plays environment and higher than the environment of standard ambient temperature constructed by drying box.
3. dry-mixed mortar cellulose ether water retention method of testing according to claim 2, is characterized in that, takes out put into drying box and be no more than 30s in step 5) to the Measuring Time of each testpieces quality from drying box.
4., according to the arbitrary described dry-mixed mortar cellulose ether water retention method of testing of claim 1-3, it is characterized in that, except standard environment, the temperature that step 4) is demarcated at least also comprises 40 DEG C and 60 DEG C.
5., according to the arbitrary described mortar cellulose ether water retention method of testing of claim 1-3, it is characterized in that, in given component, use reference cement as the binding material of dry-mixed mortar.
6. mortar cellulose ether water retention method of testing according to claim 5, it is characterized in that, adopt iso standard riddled sand in given component, sieve used is 1.0mm square hole screen.
7., according to the arbitrary described mortar cellulose ether water retention method of testing of claim 1-3, it is characterized in that, the water in mix: powder=1:5.
8. mortar cellulose ether water retention method of testing according to claim 7, it is characterized in that, water is drinking pure water, and water temperature is 23 ± 2 DEG C.
9. according to the arbitrary described mortar cellulose ether water retention method of testing of claim 1-3, it is characterized in that, container at the bottom of described band 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.
10., according to the arbitrary described mortar cellulose ether water retention method of testing of claim 1-3, it is characterized in that, the given time is 20min.
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