CN108918576A - A kind of test method detecting concrete product accumulation of salt in the surface soil degree - Google Patents
A kind of test method detecting concrete product accumulation of salt in the surface soil degree Download PDFInfo
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- CN108918576A CN108918576A CN201810460851.2A CN201810460851A CN108918576A CN 108918576 A CN108918576 A CN 108918576A CN 201810460851 A CN201810460851 A CN 201810460851A CN 108918576 A CN108918576 A CN 108918576A
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Abstract
The present invention relates to it is a kind of detect concrete product accumulation of salt in the surface soil degree test method, include the following steps, 1), test specimen production；Any suppression alkaline agent is not added wherein the 1st group is contrast specimen in shaping test piece grouping；2nd presses down alkaline agents to the different of addition according to the mass ratio of suppression alkaline agent and cement respectively to N group；2), natural curing in 7 days, 3), then above-mentioned grouping test specimen is respectively placed in absorb water in the sodium chloride solution that concentration is 1% and is saturated；4) it, takes high/low temperature circulation system to carry out accumulation of salt in the surface soil test, and records accumulation of salt in the surface soil situation；5), there is ideal accumulation of salt in the surface soil situation by 5~7 circulation surface of test piece in step 4), determines optimal suppression alkaline agent；6) verification test, is carried out.The present invention can effectively examine the experimental examination method of the pavement brick accumulation of salt in the surface soil, select reasonable accumulation of salt in the surface soil agent, and then improve pavement brick, the intensity of curb and density and help to improve product quality.
Description
Technical field
The invention belongs to detect concrete product accumulation of salt in the surface soil degree selected technology field, pavement brick is used for more particularly to one kind
With the test method of the detection concrete product accumulation of salt in the surface soil degree of curb.
Background technique
Concrete substrate material is the construction material being most widely used at present.However under certain external environmental condition,
Accumulation of salt in the surface soil phenomenon can occur for cement-based material outer surface.Accumulation of salt in the surface soil phenomenon is since cement-based material inside solable matter is in material
Caused by the deposition of surface, it is mainly shown as that " bloom " occurs in material surface.For some buildings for having external aesthetical requirement
Object, such as：Clear water bridge floor, exterior wall finish of building etc., the accumulation of salt in the surface soil ask that phenomenon can seriously affect the aesthetic properties of cement-based material.
The national standard of evaluation cement-based material alkali burnout resistance is mainly qualitative method at present：By detected materials surface
It is dried after drying or impregnate after washing away several times, accumulation of salt in the surface soil processing is carried out with the condition of alternation of wetting and drying in simulated environment, is then led to
It crosses to visually observe material surface or touch material surface and feels that the method for whether having powder to fall evaluates the alkali burnout resistance of the material
Energy.Such methods can not be accurate, quantitative evaluation cement-based material alkali burnout resistance.
The correct accumulation of salt in the surface soil method of inspection is to determine that rationally suppression alkali measure is crucial, and press down alkaline agent effect by experimental examination difference
The approach of fruit.It should meet the controllability of experimental enviroment condition and two primary conditions of repeatability of test result.Although
Also there is accumulation of salt in the surface soil method of inspection introduction in existing research, but primarily directed to mortar and concrete.We make reference to these methods into
Row experimental examination, but result all ends in failure, i.e., pavement brick and kerbstone cannot be allowed to occur according to these methods comparatively ideal
Accumulation of salt in the surface soil phenomenon.That is, these methods are not suitable for the accumulation of salt in the surface soil verifying of pavement brick and kerbstone.Special use must be researched and developed
In the accumulation of salt in the surface soil method of inspection of pavement brick and kerbstone.
Summary of the invention
The present invention is to solve technical problem present in well-known technique and providing a kind of can effectively examine the pavement brick accumulation of salt in the surface soil
Experimental examination method can quickly select reasonable accumulation of salt in the surface soil agent to be applied to the coagulations such as pavement brick, curb by this test method
In native product, and then improve the accumulation of salt in the surface soil performance that pavement brick, the intensity of curb and density help to improve product.
The present invention is adopted the technical scheme that solve technical problem present in well-known technique：
A kind of test method detecting concrete product accumulation of salt in the surface soil degree, it is characterised in that：Include the following steps,
1), test specimen makes；Height of specimen 6cm, wherein surface layer thickness 1cm, base thickness 5cm, when molding, only add in surface layer
Press down alkaline agent, is not added in base；Shaping test piece is divided into 10 groups, and every group 3 pieces, the 1st group is contrast specimen), any suppression alkaline agent is not added；
2nd to the 10th group respectively according to the mass ratio of suppression alkaline agent and cement to the different suppression alkaline agents of addition；
2), natural curing, the natural curing indoors 7 days after the above-mentioned specimen molding being made；
3), after natural curing, then above-mentioned 10 groups of test specimens is respectively placed in the sodium chloride solution that concentration is 1% and are absorbed water
Saturation, then will inhale water saturated test specimen and is placed in the cabinet for being equipped with damp sand；
4) it, takes high/low temperature circulation system to carry out accumulation of salt in the surface soil test, and records accumulation of salt in the surface soil situation：Accumulation of salt in the surface soil test takes high/low temperature to follow
Ring system：High temperature section is 25~30 DEG C, and low-temperature range is 0~5 DEG C；24 hours are a circulation, and the high temperature period is 6 ± 1 small
When, the low temperature period is 18 ± 1 hours；Water saturated test specimen will be inhaled when experiment being initially positioned at low temperature environment makes its cooling, is formed molten
The hypersaturated state of liquid；Then being placed in hot environment again promotes moisture to evaporate, and then crystallizes and be precipitated；
5), there is ideal accumulation of salt in the surface soil situation by 5~7 circulation surface of test piece in step 4), and 9 kinds of record addition at this time is not
With the test specimen accumulation of salt in the surface soil degree of suppression alkaline agent；Optimal suppression alkaline agent is determined according to accumulation of salt in the surface soil degree；
6) verification test, is carried out, finally determines optimal suppression alkaline agent.
The present invention can also use following technical measures：
Shaping test piece is divided into 10 groups.
The test specimen uses the pavement brick of actual production.
The test specimen is suppressed by cylindrical type test specimen compacting tool set；Premix required for test specimen is suppressed is placed on examination
In the die cavity of part compacting tool set, then starts press machine and slowly press to ordinance load, test specimen compression moulding.
The invention has the advantages and positive effects that：Since the present invention uses above-mentioned test method, two kinds are at least formulated
The above test method, method one can choose optimal suppression alkaline agent, and method two is for verifying；During the test i.e. simultaneously
Using a variety of testing programs for inhibiting accumulation of salt in the surface soil measure, and by comparative test check test effect, by being carried out to test result
Analysis and summary, selects suitable accumulation of salt in the surface soil agent, so propose to can effectively solve kerbstone, pavement brick surface accumulation of salt in the surface soil problem, conscientiously
Feasible technical measures are later period control with raw material, concrete mix control, controlling of production process and maintenance control etc..
In conclusion can quickly select reasonable accumulation of salt in the surface soil agent to be applied to pavement brick, curb etc. using test the method
In concrete product, and then improve the accumulation of salt in the surface soil performance that pavement brick, the intensity of curb and density help to improve product.
Detailed description of the invention
Fig. 1 is surface accumulation of salt in the surface soil situation of the test specimen after cold compartment of refrigerator places a week；
Fig. 2 is that the accumulation of salt in the surface soil situation after storage 15 days is continued in test specimen stacking place in reservoir area in institute；
Fig. 3 is accumulation of salt in the surface soil situation of the test specimen after reservoir area stacking place continues storage 30 days；
Fig. 4 is the test result of the accumulation of salt in the surface soil method of inspection.
Specific embodiment
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and cooperate attached drawing
Detailed description are as follows：
A kind of test method detecting concrete product accumulation of salt in the surface soil degree, includes the following steps,
1), test specimen makes；Height of specimen 6cm, wherein surface layer thickness 1cm, base thickness 5cm, when molding, only add in surface layer
Press down alkaline agent, is not added in base；Shaping test piece is divided into 10 groups, and every group 3 pieces, the 1st group is contrast specimen), any suppression alkaline agent is not added；
2nd to the 10th group respectively according to the mass ratio of suppression alkaline agent and cement to the different suppression alkaline agents of addition；
2), natural curing, the natural curing indoors 7 days after the above-mentioned specimen molding being made；
3), after natural curing, then above-mentioned 10 groups of test specimens is respectively placed in the sodium chloride solution that concentration is 1% and are absorbed water
Saturation, then will inhale water saturated test specimen and is placed in the cabinet for being equipped with damp sand；
4) it, takes high/low temperature circulation system to carry out accumulation of salt in the surface soil test, and records accumulation of salt in the surface soil situation：Accumulation of salt in the surface soil test takes high/low temperature to follow
Ring system：High temperature section is 25~30 DEG C, and low-temperature range is 0~5 DEG C；24 hours are a circulation, and the high temperature period is 6 ± 1 small
When, the low temperature period is 18 ± 1 hours；Water saturated test specimen will be inhaled when experiment being initially positioned at low temperature environment makes its cooling, is formed molten
The hypersaturated state of liquid；Then being placed in hot environment again promotes moisture to evaporate, and then crystallizes and be precipitated；
5), there is ideal accumulation of salt in the surface soil situation by 5~7 circulation surface of test piece in step 4), and 9 kinds of record addition at this time is not
With the test specimen accumulation of salt in the surface soil degree of suppression alkaline agent；Optimal suppression alkaline agent is determined according to accumulation of salt in the surface soil degree；
6), according to above-mentioned steps 1)~5) verification test is carried out, finally determine optimal suppression alkaline agent.
Shaping test piece is divided into 10 groups；
The test specimen uses the pavement brick of actual production.
The test specimen is suppressed by cylindrical type test specimen compacting tool set；Premix required for test specimen is suppressed is placed on examination
In the die cavity of part compacting tool set, then starts press machine and slowly press to ordinance load, test specimen compression moulding.
Embodiment has specifically carried out suppression alkali validity check using two kinds of methods of inspection in order to further illustrate book；
The acquisition experimental result of first method, specific practice are：
(1), 10 groups of forming cylinder body test specimen, every group 3 pieces, the 1st group is contrast specimen (blank group), and any suppression alkali is not added
Agent；2nd to the 10th group of different suppression alkaline agents corresponded respectively in table 7-1；It should be noted that test specimen will consider season when making
Section selects the raw material of test specimen compacting to be suitble to the proportion of Various Seasonal in summer or winter, and temperature is satisfied the need face brick, curb etc.
The influence of product is well known in the art；Therefore it needs to select different match ratios according to the difference in season；The present embodiment is selected
Winter match ratio, outdoor temperature are 15~28 DEG C；By weight, test specimen includes 400 parts of P.O.42.5 cement；S95 miberal powder 50
Part；950 parts of CHARACTERISTICS OF TAILINGS SAND；200 parts of powdered coal cinder；900 parts of iron ore clast, tap water 169；Water-cement ratio is 0.44；
(2), simulation practical pavement brick when specimen molding is divided into surface layer and base, and height of specimen 6cm, wherein surface layer is thick
1cm, base thickness 5cm only add suppression alkaline agent when molding in surface layer, are not added in base.The volume for pressing down alkaline agent presses manufacturer's recommended value
It selects, is shown in Table 7-1.
The volume of table 7-1 test specimen number and suppression alkaline agent is the mass ratio for pressing down alkaline agent and cement
(3), natural curing indoors 7 days after specimen molding；
(4), it then is saturated its water suction with the sodium chloride solution that concentration is 1%, then test specimen is placed in and is covered with damp sand
Plastic casing in, then entire plastic casing is placed in refrigerator (temperature is 5 DEG C), records and observe accumulation of salt in the surface soil situation.
5), situation of the test specimen after cold compartment of refrigerator places a week is as shown in Figure 1, accumulation of salt in the surface soil effect is less desirable.
Encounter rainfall cooling (late October), outdoor cold wind whiz whiz just during this period, minimum temperature is stacked in field in zero degree or so
Closely there is the accumulation of salt in the surface soil in one layer of ground many places in the kerbstone of stacking.Therefore it is general test specimen to be moved into outdoor kerbstone stacking field by refrigerator
The serious place of alkali, temperature, humidity and the wind of this position all easily make the kerbstone accumulation of salt in the surface soil, continue to observe and record accumulation of salt in the surface soil situation.
The obvious accumulation of salt in the surface soil occurs for test specimen part test specimen after stacking field and placing two weeks, as shown in fig. 2, it can be seen that
Difference suppression alkaline agent accumulation of salt in the surface soil situation is not quite similar, and there is no the accumulation of salt in the surface soil for the test specimen of number 6,8 and 9, illustrate the mixed suppression alkali of test specimen
Agent has good inhibition accumulation of salt in the surface soil effect, they are respectively B101, hydrophober T80 and silane based powders SHP-50.Remaining 6 kinds effects
Fruit is poor, is not able to satisfy requirement, should eliminate.
In order to investigate the long-term effectiveness of various suppression alkaline agents, the original position for continuing test specimen to be placed on stacking place is observed
And record its accumulation of salt in the surface soil situation.Test specimen is stacking the accumulation of salt in the surface soil situation after storing one month in field fig. 3, it is shown that number
It still is able to inhibit the accumulation of salt in the surface soil well for No. 6, No. 8 and No. 9 test specimens, illustrates B101, hydrophober T80, silane based powders SHP-
50 3 kinds of suppression alkaline agents meet requirement.
In order to guarantee the reliability of experimental result, and verified by the method for inspection that above-mentioned section proposes, specific practice
For：
(1) 10 groups of forming cylinder body test specimen, every group 3 pieces, the 1st group is contrast specimen (blank group), and any suppression alkali is not added
Agent；2nd to the 10th group of different suppression alkaline agents corresponded respectively in table 7-1；
(2) simulation practical pavement brick when specimen molding is divided into surface layer and base, and height of specimen 6cm, wherein surface layer is thick
1cm, base thickness 5cm only add suppression alkaline agent when molding in surface layer, are not added in base；The volume for pressing down alkaline agent presses manufacturer's recommended value
It selects, is shown in Table 7-2.
(3) by test specimen natural curing after molding 15 days, preservative film then is wrapped in test specimen circumferential direction side, it is therefore an objective to contract
Small moisture disengagement area increases water evaporation rate；
(4) test specimen after film will be twined to be placed in the plastic casing of depth of water 2cm or so, be allowed to absorb water (tap water or well water) it is full
With；Then test specimen is moved in the plastic casing for being covered with damp sand (the sub- state of damp sand be subject to can not water breakthrough)；
(5) plastic casing is placed in refrigerator cold-storage room 8~12 hours, control temperature of refrigerating chamber is 0~5 DEG C；It then will modeling
Magazine is put in the interior that temperature is about 25 DEG C from refrigerator taking-up, utilizes electric fan (University Of Tianjin laboratory) and air-conditioning (Ai Er skill
Subject office) promote test specimen moisture to evaporate；
(6) " cooling processing+moisture evaporation " is a circulation, and controlling each circulation is 24 hours, observes test specimen table at any time
Face accumulation of salt in the surface soil situation.
Test specimen is subjected to accumulation of salt in the surface soil test according to the above method, observes and records accumulation of salt in the surface soil situation daily.Accumulation of salt in the surface soil photo is as schemed at 7 days
Shown in 4.As can be seen that number be 6,8 and 9 test specimen there is no the accumulation of salt in the surface soil, remaining group test specimen it is all different degrees of the accumulation of salt in the surface soil has occurred,
This is identical as the conclusion obtained by first method, also demonstrates the reliability of test result.
Water drip test, available from figure 4, the test specimen table of number 6,8 and 9 are carried out in the surface of test piece that number is 6,8 and 9
Face has formed one layer of effective hydrophobic membrane, and outside water can be prevented to enter test specimen, while can also block in concrete
Portion's ion transports the surface of pavement brick, to have the function that inhibit the accumulation of salt in the surface soil.
The present invention uses above-mentioned test method, at least formulates two or more test methods, method one can choose most ideal
Suppression alkaline agent, method two is for verifying；It is during the test while uses a variety of testing programs for inhibiting accumulation of salt in the surface soil measures, and
Suitable accumulation of salt in the surface soil agent, Jin Erti are selected by being analyzed and summarized to test result by comparative test check test effect
Can effectively solve out kerbstone, pavement brick surface accumulation of salt in the surface soil problem, practicable technical measures, be later period control with raw material,
Concrete mix control, controlling of production process and maintenance control etc..
In conclusion can quickly select reasonable accumulation of salt in the surface soil agent to be applied to pavement brick, curb etc. using test the method
In concrete product, and then improve the accumulation of salt in the surface soil performance that pavement brick, the intensity of curb and density help to improve product.
The above is only the preferred embodiments of the present invention, and is not intended to limit the present invention in any form,
Any simple modification made to the above embodiment according to the technical essence of the invention, equivalent variations and modification, belong to
In the range of technical solution of the present invention.
Claims (4)
1. a kind of test method for detecting concrete product accumulation of salt in the surface soil degree, it is characterised in that：Include the following steps,
1), test specimen makes；Height of specimen 6cm, wherein surface layer thickness 1cm, base thickness 5cm, when molding, only add suppression alkali in surface layer
Agent is not added in base；Shaping test piece is at least divided into 2 groups, and every group 3 pieces, wherein the 1st group is contrast specimen, any suppression alkaline agent is not added；
2nd presses down alkaline agents to the different of addition according to the mass ratio of suppression alkaline agent and cement respectively to N group；
2), natural curing, the natural curing indoors 7 days after the above-mentioned specimen molding being made；
3), after natural curing, test specimen is then respectively placed in the sodium chloride solution that concentration is 1% saturation that absorbs water, then will
Water saturated test specimen is inhaled to be placed in the cabinet for being equipped with damp sand；
4) it, takes high/low temperature circulation system to carry out accumulation of salt in the surface soil test, and records accumulation of salt in the surface soil situation：High/low temperature circulation system is taken in accumulation of salt in the surface soil test
Degree：High temperature section is 25~30 DEG C, and low-temperature range is 0~5 DEG C；24 hours are a circulation, and the high temperature period is 6 ± 1 hours, low
The warm period is 18 ± 1 hours；Water saturated test specimen will be inhaled when experiment being initially positioned at low temperature environment makes its cooling, forms the mistake of solution
Saturation state；Then being placed in hot environment again promotes moisture to evaporate, and then crystallizes and be precipitated；
5), there is ideal accumulation of salt in the surface soil situation by 5~7 circulation surface of test piece in step 4), the different suppression alkali of 9 kinds of record addition at this time
The test specimen accumulation of salt in the surface soil degree of agent；Optimal suppression alkaline agent is determined according to accumulation of salt in the surface soil degree；
6) verification test, is carried out, finally determines optimal suppression alkaline agent.
2. the test method of detection concrete product accumulation of salt in the surface soil degree according to claim 1, it is characterised in that：Shaping test piece
It is divided into 10 groups.
3. the test method of detection concrete product accumulation of salt in the surface soil degree according to claim 1, it is characterised in that：The test specimen
Using the pavement brick of actual production.
4. the test method of detection concrete product accumulation of salt in the surface soil degree according to claim 1, it is characterised in that：The test specimen
It is suppressed by cylindrical type test specimen compacting tool set；Premix required for test specimen is suppressed is placed on the die cavity of test specimen compacting tool set
In, then start press machine and slowly presses to ordinance load, test specimen compression moulding.
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Cited By (4)
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| CN111896484A (en) * | 2020-07-29 | 2020-11-06 | 华润水泥技术研发有限公司 | Quantitative characterization method for whiskering degree of cement-based material |
| CN112649322A (en) * | 2020-12-30 | 2021-04-13 | 宜兴摩根热陶瓷有限公司 | Test method for testing alkali return resistance of castable |
| CN113092743A (en) * | 2021-04-02 | 2021-07-09 | 中国建材检验认证集团北京天誉有限公司 | Cement product whiskering test equipment and whiskering degree detection method |
| CN118015005A (en) * | 2024-04-10 | 2024-05-10 | 合肥工业大学 | Machine vision-based whiskering detection method and portable detection device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111896484A (en) * | 2020-07-29 | 2020-11-06 | 华润水泥技术研发有限公司 | Quantitative characterization method for whiskering degree of cement-based material |
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| CN118015005A (en) * | 2024-04-10 | 2024-05-10 | 合肥工业大学 | Machine vision-based whiskering detection method and portable detection device |
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