CN106092766A - A kind of assay method of low water-cement ratio strength of cement mortar - Google Patents
A kind of assay method of low water-cement ratio strength of cement mortar Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention discloses the assay method of a kind of low water-cement ratio strength of cement mortar, it comprises the following steps: S1. glue sand stirs；S2. glue sand molding；S3. maintenance；S4. strength detection.The present invention establishes a kind of cement strength testing method of low water-cement ratio, and for characterizing the cement mechanical property of cement, this assay and concrete have good dependency.For cement user, preferably can set up reliable functional relationship between strength of cement and concrete strength, and then set up the intensity mathematical model of mix Design；For cement plant, cement intensity performance in concrete can be effectively improved, it is to avoid only obtain an intensity data come to the surface.
Description
Technical field
The present invention relates to technical field of cement production, be specifically related to the mensuration side of a kind of low water-cement ratio strength of cement mortar
Method.
Background technology
Strength of cement mortar is one of most important quality index of common portland cement, determine that strength of cement grade and
The foundation of strength grade of concrete, obtained official standard CB/T17671-1999 " Test method for strength of hydraulic cement mortar (ISO method) "
Method.The method has continued to use the national standard of Germany, the history of existing more than 100 year.In past centenary history, the party
Method preferably reflects the mechanical property of cement, has good dependency with concrete strength.But recent decades, due to diminishing
Commonly using of agent, high efficiency water reducing agent and high-performance water reducing agent, the process show obvious defect: 1. with admixture water reducer
Concrete compares, and the ratio of mud of the method is higher；2. water reducer is not filled during inspection, the Hydration of cement and hydrated product
Pattern has significant difference with the concrete of admixture water reducer.
The extensively application of high efficiency water reducing agent is an important key character of modern concrete.Due to making of high efficiency water reducing agent
With so that the ratio of mud of modern concrete is greatly lowered, and as the basic foundation of mix Design, continues to use a century
Bolomey's formula, the suitability becomes worse and worse.In other words, relevant between current strength of cement mortar and concrete strength
Property becomes worse and worse.Main reason is that, water-binder ratio reduces and uses high efficiency water reducing agent, the aquation of the cement of change
Course and hydrated product pattern.Strength of cement mortar is the main source of concrete strength, is also by concrete strength simultaneously
The Main Basis of design, is one of most important cement performance index.Due to strength of cement mortar and concrete strength dependency
Reduction, cause current mix Design, almost without reliable mathematical model, and the most by virtue of experience,
Become a significant short slab of mix Design, concrete Quality Control.
Root according to data, currently mainly has following several middle predicting of Cement Strength method mainly to have: 1, two-dimensional parameter method；2、
Cement paste cylinder method in Lei Shi folder；3, boiling process；4,1.5h autoclave curing promotees hard method；5, resistivity method；6, High-temperature Liquefaction
Water regimen；7, conventional sense quickly estimates method；8, truncated cone-shaped concrete paste specimen method；9, the clean slurry processes of high temperature；10,55 DEG C damp and hot
Method of curing.Good dependency is not all had between assay and the concrete strength of said method.In addition, " cement is strong
Degree method for quickly detecting " JC/T738-2004 there is problems simultaneously: 1, in different cement product, the cement water of different labels
Change process is different with strength development rule, uses same predictor formula, there is the situation that prediction deviation is bigger；2, the intensity returned
Predictor formula correlation coefficient requires low, it was predicted that bigger error.
Summary of the invention
It is an object of the invention to overcome the shortcoming of prior art, it is provided that the mensuration of a kind of low water-cement ratio strength of cement mortar
Method, the method adds water reducer when checking strength of cement mortar.
The purpose of the present invention is achieved through the following technical solutions: the mensuration side of a kind of low water-cement ratio strength of cement mortar
Method, it comprises the following steps:
S1. glue sand stirring: in being joined by normal sand in the sand storehouse of blender, be sequentially added into water, water reducer in agitated kettle
And cement, after stirring at low speed 30s, the normal sand in sand storehouse is uniformly added into, heightens rotating speed, high-speed stirred 30s, stop mixing 90s,
With rubber scraping, the glue sand on blade and pot wall is scraped in agitated kettle in first 15s, then high-speed stirred 60s；Wherein, institute
Stating cement, normal sand and water in quality mixture ratio is cement: normal sand: water is the ratio mixing of 1:3:0.38；
S2. glue sand molding: being shaped to test specimen with plain bumper or vibration table immediately after the stirring of glue sand, molding uses a size of
Three gang moulds of 40mm × 40mm × 160mm；
S3. maintenance: test specimen maintenance in constant-temp. and-moisture maintenance maintenance or water；
S4. strength detection: include that rupture strength measures and compressive strength determination.
Further, described cement is portland cement, Portland cement, portland slag cement, flyash-Si
Hydrochlorate water, composite Portland cement base or limestone portland cement.
Further, the volume of described water reducer is flow of cement mortar meter 180～200mm.
Further, the method for described constant-temp. and-moisture maintenance maintenance is: put into by test specimen in constant-temp. and-moisture maintenance, temperature
Degree is 19～21 DEG C, humidity >=90%, and the age of maintenance to regulation carries out the demoulding, demoulding test specimen and covers with wet cloth.Described age
Phase is 24h, and the demoulding time should be before strength detection in 20min；Described age ＞ 24h, the demoulding time is after molding 20～24h.
Further, in described water, the method for maintenance is: by the most horizontal or vertical for the test specimen water putting into 19～21 DEG C
Maintenance, takes out in 15min after the age of regulation before strength detection from water, and demoulding test specimen covers with wet cloth.
Further, described rupture strength is determined as: the side of demoulding test specimen is placed on testing machine and supports on cylinder, test specimen
Major axis is perpendicular to support cylinder, carries out rupture strength experiment according to anti-folding machine operational approach, by loading cylinder with 40～60N/s
Rate uniform ground load is loaded on prism opposite flank, until fractureing.
Further, described compressive strength determination is: the test specimen block carrying out rupture strength experiment is placed in forcing press
In resistance to compression fixture, carry out comprcssive strength experiment according to pressure operation method, in whole loading process with 2200～2600N/s speed
Rate continuous load is to destroying.
The invention have the advantages that the present invention establishes a kind of cement strength testing method of low water-cement ratio, for table
Levying the cement mechanical property of cement, this assay and concrete have good dependency.For cement user, Ke Yigeng
Between strength of cement and concrete strength, set up well reliable functional relationship, and then set up the strong of mix Design
Degree mathematical model；For cement plant, cement intensity performance in concrete can be effectively improved, it is to avoid only obtain a table
The intensity data in face.
Accompanying drawing explanation
Fig. 1 is the dependency graph of Different Water-Cement Ratio cement 3d comprcssive strength and C30 concrete 3d comprcssive strength；
Fig. 2 is the dependency graph of Different Water-Cement Ratio cement 28d comprcssive strength and C30 concrete 28d comprcssive strength；
Fig. 3 is the dependency graph of Different Water-Cement Ratio cement 90d comprcssive strength and C30 concrete 90d comprcssive strength.
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further described, and protection scope of the present invention is not limited to following institute
State.
Embodiment 1: the assay method of a kind of low water-cement ratio strength of cement mortar, it comprises the following steps:
S1. glue sand stirring: in being joined by normal sand in the sand storehouse of blender, be sequentially added into water, water reducer in agitated kettle
And cement, after stirring at low speed 30s, the normal sand in sand storehouse is uniformly added into, heightens rotating speed, high-speed stirred 30s, stop mixing 90s,
With rubber scraping, the glue sand on blade and pot wall is scraped in agitated kettle in first 15s, then high-speed stirred 60s；Wherein, institute
Stating cement, normal sand and water in quality mixture ratio is cement: normal sand: water is the ratio mixing of 1:3:0.38；Described cement is
Portland cement；The volume of described water reducer is flow of cement mortar 180mm；
S2. glue sand molding: being shaped to test specimen with plain bumper immediately after the stirring of glue sand, molding uses a size of 40mm × 40mm
Three gang moulds of × 160mm；Sky die trial and die sleeve are fixed on plain bumper, with a suitable spoon directly from agitated kettle by glue
Sand divides the people's die trial of two layers of dress, and during dress ground floor, 300g glue sand is put in each groove Rio, with big broadcast feeder vertical rack on edge, die sleeve top
The bed of material is the most once broadcast flat by each die cavity, then jolt ramming 60 times；Reinstall second layer glue sand, broadcast flat with little broadcast feeder, then shake
Real 60 times, remove die sleeve；Die trial is taken off, with a metal ruler to approximate the angle frame of 90 ° on die trial mould top from plain bumper
One end, then slowly moves to the other end along die trial length direction with horizontal sawing action, once will exceed the glue of die trial part
Sand scrapes off, and floating will try surface in the case of almost horizontal with same ruler, marks or add brief note mark in die trial
Bright test specimen numbering and test specimen are relative to the position of plain bumper；
S3. maintenance: test specimen is in constant-temp. and-moisture maintenance maintenance；The method of described constant-temp. and-moisture maintenance maintenance is: will examination
Part is put in constant-temp. and-moisture maintenance, temperature be temperature be 19 DEG C, humidity is >=90%, maintenance to regulation age take off
Mould, demoulding test specimen cover with wet cloth, and described age is 24h, and the demoulding time should be before strength detection in 20min；Described age
＞ 24h, the demoulding time is after molding 20～24h；
S4. strength detection: include that rupture strength measures and compressive strength determination；
Described rupture strength is determined as: the side of demoulding test specimen is placed on testing machine and supports that on cylinder, test specimen major axis is vertical
In supporting cylinder, carry out rupture strength experiment according to anti-folding machine operational approach, by loading cylinder with the rate uniform of 40N/s ground
Load is loaded on prism opposite flank, until fractureing；
Described compressive strength determination is: the test specimen block carrying out rupture strength experiment is placed in the resistance to compression fixture of forcing press
In, carrying out comprcssive strength experiment according to pressure operation method, in whole loading process, the rate uniform loading with 2200N/s is the most broken
Bad.
Embodiment 2: the assay method of a kind of low water-cement ratio strength of cement mortar, it comprises the following steps:
S1. glue sand stirring: in being joined by normal sand in the sand storehouse of blender, be sequentially added into water, water reducer in agitated kettle
And cement, after stirring at low speed 30s, the normal sand in sand storehouse is uniformly added into, heightens rotating speed, high-speed stirred 30s, stop mixing 90s,
With rubber scraping, the glue sand on blade and pot wall is scraped in agitated kettle in first 15s, then high-speed stirred 60s；Wherein, institute
Stating cement, normal sand and water in quality mixture ratio is cement: normal sand: water is the ratio mixing of 1:3:0.38；Described cement is
Portland cement or limestone portland cement；The volume of described water reducer is flow of cement mortar 200mm；
S2. glue sand molding: being shaped to test specimen with vibration table immediately after the stirring of glue sand, molding uses a size of 40mm × 40mm
Three gang moulds of × 160mm；Die trial and lower funnel are clamped on the center of vibration table, by be stirred while stirring glue sand
All glue sand is uniformly charged in lower funnel, starts vibration table, and glue sand flows into die trial by funnel, and vibration 120s ± 5s stops
Car, vibrates complete, takes off die trial, scrapes off its glue sand exceeding die trial floating with scraping leveling ruler, then mark in die trial or
Indicate that test specimen is numbered with brief note；
S3. maintenance: test specimen is maintenance in water；In described water, the method for maintenance is: put into the most horizontal or vertical for test specimen
Maintenance in the water of 19 DEG C, takes out in 15min after the age of regulation before strength detection from water, and demoulding test specimen covers with wet cloth
Lid；
S4. strength detection: include that rupture strength measures and compressive strength determination；
Described rupture strength is determined as: the side of demoulding test specimen is placed on testing machine and supports that on cylinder, test specimen major axis is vertical
In supporting cylinder, carry out rupture strength experiment according to anti-folding machine operational approach, by loading cylinder with the rate uniform of 60N/s ground
Load is loaded on prism opposite flank, until fractureing；
Described compressive strength determination is: the test specimen block carrying out rupture strength experiment is placed in the resistance to compression fixture of forcing press
In, carrying out comprcssive strength experiment according to pressure operation method, in whole loading process, the rate uniform loading with 2600N/s is the most broken
Bad.
Embodiment 3: the assay method of a kind of low water-cement ratio strength of cement mortar, it comprises the following steps:
S1. glue sand stirring: in being joined by normal sand in the sand storehouse of blender, be sequentially added into water, water reducer in agitated kettle
And cement, after stirring at low speed 30s, the normal sand in sand storehouse is uniformly added into, heightens rotating speed, high-speed stirred 30s, stop mixing 90s,
With rubber scraping, the glue sand on blade and pot wall is scraped in agitated kettle in first 15s, then high-speed stirred 60s；Wherein, institute
Stating cement, normal sand and water in quality mixture ratio is cement: normal sand: water is the ratio mixing of 1:3:0.38；Described cement is
Portland cement, Portland cement, portland slag cement, fly ash silicate water, composite Portland cement base or stone
Lime stone portland cement；The volume of described water reducer is flow of cement mortar 190mm；
S2. glue sand molding: being shaped to test specimen with vibration table immediately after the stirring of glue sand, molding uses a size of 40mm × 40mm
Three gang moulds of × 160mm；Die trial and lower funnel are clamped on the center of vibration table, by be stirred while stirring glue sand
All glue sand is uniformly charged in lower funnel, starts vibration table, and glue sand flows into die trial by funnel, and vibration 120s ± 5s stops
Car, vibrates complete, takes off die trial, scrapes off its glue sand exceeding die trial floating with scraping leveling ruler, then mark in die trial or
Indicate that test specimen is numbered with brief note；
S3. maintenance: test specimen is maintenance in water；In described water, the method for maintenance is: put into the most horizontal or vertical for test specimen
Maintenance in the water of 21 DEG C, takes out in 15min after the age of regulation before strength detection from water, and demoulding test specimen covers with wet cloth
Lid；
S4. strength detection: include that rupture strength measures and compressive strength determination；
Described rupture strength is determined as: the side of demoulding test specimen is placed on testing machine and supports that on cylinder, test specimen major axis is vertical
In supporting cylinder, carry out rupture strength experiment according to anti-folding machine operational approach, by loading cylinder with the rate uniform of 45N/s ground
Load is loaded on prism opposite flank, until fractureing；
Described compressive strength determination is: the test specimen block carrying out rupture strength experiment is placed in the resistance to compression fixture of forcing press
In, carrying out comprcssive strength experiment according to pressure operation method, in whole loading process, the rate uniform loading with 2300N/s is the most broken
Bad.
Embodiment 4: the assay method of a kind of low water-cement ratio strength of cement mortar, it comprises the following steps:
S1. glue sand stirring: in being joined by normal sand in the sand storehouse of blender, be sequentially added into water, water reducer in agitated kettle
And cement, after stirring at low speed 30s, the normal sand in sand storehouse is uniformly added into, heightens rotating speed, high-speed stirred 30s, stop mixing 90s,
With rubber scraping, the glue sand on blade and pot wall is scraped in agitated kettle in first 15s, then high-speed stirred 60s；Wherein, institute
Stating cement, normal sand and water in quality mixture ratio is cement: normal sand: water is the ratio mixing of 1:3:0.38；Described cement is
Portland cement, Portland cement, portland slag cement, fly ash silicate water, composite Portland cement base or stone
Lime stone portland cement；The volume of described water reducer is flow of cement mortar 195mm；
S2. glue sand molding: being shaped to test specimen with plain bumper immediately after the stirring of glue sand, molding uses a size of 40mm × 40mm
Three gang moulds of × 160mm；Sky die trial and die sleeve are fixed on plain bumper, with a suitable spoon directly from agitated kettle by glue
Sand divides the people's die trial of two layers of dress, and during dress ground floor, 300g glue sand is put in each groove Rio, with big broadcast feeder vertical rack on edge, die sleeve top
The bed of material is the most once broadcast flat by each die cavity, then jolt ramming 60 times；Reinstall second layer glue sand, broadcast flat with little broadcast feeder, then shake
Real 60 times, remove die sleeve；Die trial is taken off, with a metal ruler to approximate the angle frame of 90 ° on die trial mould top from plain bumper
One end, then slowly moves to the other end along die trial length direction with horizontal sawing action, once will exceed the glue of die trial part
Sand scrapes off, and floating will try surface in the case of almost horizontal with same ruler, marks or add brief note mark in die trial
Bright test specimen numbering and test specimen are relative to the position of plain bumper；
S3. maintenance: test specimen is in constant-temp. and-moisture maintenance maintenance；The method of described constant-temp. and-moisture maintenance maintenance is: will examination
Part is put in constant-temp. and-moisture maintenance, and temperature is 21 DEG C, and humidity is >=90%, and maintenance carries out the demoulding to the age of regulation, the most de-
Mould test specimen covers with wet cloth, and described age is 24h, and the demoulding time should be before strength detection in 20min；Described age ＞ 24h, de-
The mould time is after molding 20～24h；
S4. strength detection: include that rupture strength measures and compressive strength determination；
Described rupture strength is determined as: the side of demoulding test specimen is placed on testing machine and supports that on cylinder, test specimen major axis is vertical
In supporting cylinder, carry out rupture strength experiment according to anti-folding machine operational approach, by loading cylinder with the rate uniform of 55N/s ground
Load is loaded on prism opposite flank, until fractureing；
Described compressive strength determination is: the test specimen block carrying out rupture strength experiment is placed in the resistance to compression fixture of forcing press
In, carrying out comprcssive strength experiment according to pressure operation method, in whole loading process, the rate uniform loading with 2500N/s is the most broken
Bad.
Below by way of description of test beneficial effects of the present invention:
1. laboratory sample: as shown in table 1:
Table 1: laboratory sample
2. experimental technique, uses the inventive method to measure under Different Water-Cement Ratio, cement and C30 concrete 3d, 28d and 90d
Comprcssive strength and draw the relation of cement and C30 concrete 3d, 28d and 90d comprcssive strength.Experimental result is shown in Table 2, table 3, table 4,
Fig. 1, Fig. 2 and Fig. 3.
3. experimental result
From table 2, table 3 and table 4, when the ratio of mud is 0.38, cement is strong with the comprcssive strength of C30 concrete and anti-folding
Spend best.Fig. 1 is the dependency graph of Different Water-Cement Ratio cement 3d comprcssive strength and C30 concrete 3d comprcssive strength, and Fig. 1 shows,
All having certain dependency between 3d comprcssive strength and the concrete 3d comprcssive strength of O.5 and 0.38 ratio of mud, correlation coefficient is respectively
For: the dependency of 0.79,0.88,0.38 ratio of mud intensity is more preferable.Fig. 2 is that Different Water-Cement Ratio cement 28d comprcssive strength is mixed with C30
The dependency of solidifying soil 28d comprcssive strength.Fig. 2 shows, the 28d comprcssive strength of 0.38 ratio of mud and concrete 28d comprcssive strength it
Between have preferable dependency, correlation coefficient is 0.90；The 28d comprcssive strength of 0.5 ratio of mud and C30 concrete 28d comprcssive strength
Between dependency poor, correlation coefficient is 0.64.Fig. 3 Different Water-Cement Ratio cement 90d comprcssive strength and C30 concrete 90d resistance to compression
The dependency of intensity.Fig. 3 shows, has general level between 90d comprcssive strength and the concrete 90d comprcssive strength of 0.38 ratio of mud
Dependency, correlation coefficient is 0.77；Do not have relevant between the 90d comprcssive strength of 0.5 ratio of mud to concrete 90d comprcssive strength
Property, correlation coefficient is 0.02.
Table 2:P.O42.5 cement 0.5 ratio of mud intensity
Table 3:P.O42.5 cement 0.38 ratio of mud intensity
The C30 concrete strength of table 4:P.O42.5 cement configuration
Claims (7)
1. the assay method of a low water-cement ratio strength of cement mortar, it is characterised in that it comprises the following steps:
S1. glue sand stirring: in being joined by normal sand in the sand storehouse of blender, be sequentially added into water, water reducer and water in agitated kettle
Mud, is uniformly added into the normal sand in sand storehouse after stirring at low speed 30s, heightens rotating speed, high-speed stirred 30s, stop mixing 90s,
With rubber scraping, the glue sand on blade and pot wall is scraped in agitated kettle in one 15s, then high-speed stirred 60s；Wherein, described water
Mud, normal sand and water are cement in quality mixture ratio: normal sand: water is the ratio mixing of 1:3:0.38；
S2. glue sand molding: being shaped to test specimen with plain bumper or vibration table immediately after the stirring of glue sand, molding uses a size of 40mm
Three gang moulds of × 40mm × 160mm；
S3. maintenance: test specimen maintenance in constant-temp. and-moisture maintenance maintenance or water；
S4. strength detection: include that rupture strength measures and compressive strength determination.
The assay method of a kind of low water-cement ratio strength of cement mortar the most as claimed in claim 1, it is characterised in that described cement
For portland cement, Portland cement, portland slag cement, fly ash silicate water, composite Portland cement base or
Limestone portland cement.
The assay method of a kind of low water-cement ratio strength of cement mortar the most as claimed in claim 1, it is characterised in that described diminishing
The volume of agent is flow of cement mortar 180～200mm.
The assay method of a kind of low water-cement ratio strength of cement mortar the most as claimed in claim 1, it is characterised in that described constant temperature
The method of constant moisture culturing box maintenance is: put into by test specimen in constant-temp. and-moisture maintenance, and temperature is 19～21 DEG C, and humidity is >=90%,
Maintenance to the age specified carries out the demoulding, demoulding test specimen and covers with wet cloth, and described age is 24h, and the demoulding time should be in intensity
Before measuring in 20min；Described age ＞ 24h, the demoulding time is after molding 20～24h.
The assay method of a kind of low water-cement ratio strength of cement mortar the most as claimed in claim 1, it is characterised in that in described water
The method of maintenance is: by maintenance in the most horizontal or vertical for the test specimen water putting into 19～21 DEG C, in intensity after the age of regulation
Taking out from water in 15min before measuring, demoulding test specimen covers with wet cloth.
The assay method of a kind of low water-cement ratio strength of cement mortar the most as claimed in claim 1, it is characterised in that described anti-folding
Strength detection is: the side of demoulding test specimen being placed on testing machine and supports on cylinder, test specimen major axis is perpendicular to support cylinder, according to anti-
Folding machine operational approach carries out rupture strength experiment, by loading cylinder with 40～60N/s rate uniform load is loaded rib
On cylinder opposite flank, until fractureing.
The assay method of a kind of low water-cement ratio strength of cement mortar the most as claimed in claim 1, it is characterised in that described resistance to compression
Strength detection is: be placed in the resistance to compression fixture of forcing press by the test specimen block carrying out rupture strength experiment, according to pressure operation side
Method carries out comprcssive strength experiment, and in whole loading process, the rate uniform loading with 2200～2600N/s extremely destroys.
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| CN111829848A (en) * | 2020-07-22 | 2020-10-27 | 江苏建纬检测股份有限公司 | Plain bumper prepared from test piece for cement mortar strength detection and test piece preparation method |
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