WO2015011911A1 - セメント原料用高炉水砕スラグおよびその選別方法 - Google Patents

セメント原料用高炉水砕スラグおよびその選別方法 Download PDF

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WO2015011911A1
WO2015011911A1 PCT/JP2014/003829 JP2014003829W WO2015011911A1 WO 2015011911 A1 WO2015011911 A1 WO 2015011911A1 JP 2014003829 W JP2014003829 W JP 2014003829W WO 2015011911 A1 WO2015011911 A1 WO 2015011911A1
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blast furnace
cement
slag
granulated
mass
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PCT/JP2014/003829
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English (en)
French (fr)
Japanese (ja)
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博幸 當房
渡辺　圭児
桑山　道弘
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Ｊｆｅスチール株式会社
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Priority to KR1020157030353A priority Critical patent/KR20150133272A/ko
Priority to CN201480022750.7A priority patent/CN105143137B/zh
Priority to JP2015508915A priority patent/JP5967294B2/ja
Publication of WO2015011911A1 publication Critical patent/WO2015011911A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00215—Mortar or concrete mixtures defined by their oxide composition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Definitions

  • the present invention relates to a granulated blast furnace slag slag raw slag for a cement raw material for a high temperature region having an annual average temperature of 22 ° C or higher, and a method for selecting the same.
  • Blast furnace granulated slag is a by-product generated in the steel manufacturing process, and is mainly used as a cement raw material mainly composed of CaO, Al 2 O 3 , MgO, and SiO 2 .
  • Ground granulated blast furnace slag obtained by pulverizing blast furnace granulated slag is also used as a blending material for ordinary portland cement, especially blast furnace cement (portland).
  • blast furnace cement is a kind of blended cement obtained by mixing ordinary Portland cement and ground granulated blast furnace slag.
  • the content of ground granulated blast furnace slag is 40% by mass. The degree is common.
  • blast furnace cement ordinary Portland cement and blast furnace granulated slag fine powder, including those having a wide mixing ratio range, such as when the content of ground granulated blast furnace slag is 20% by mass, etc.
  • mixed cement with blast furnace granulated slag fine powder including those having a wide mixing ratio range, such as when the content of ground granulated blast furnace slag is 20% by mass, etc.
  • Cement is hydrated (hydration reaction) and hydrated product (hydration product) is generated to improve the strength, but if the hydration reaction is too fast, cement or other cement hardened (cement hardened body) There is a problem of causing cracks. This is because if the hydration reaction is too fast, the exotherm per unit time due to the hydration reaction increases and the temperature inside the concrete rises. In particular, concrete with a large volume has a small heat dissipation area (heat dissipation area), so the temperature rise inside the concrete becomes too large and cracks in the concrete become prominent.
  • heat dissipation area heat dissipation area
  • blast furnace cement is widely used instead of ordinary Portland cement for large concrete structures.
  • Blast furnace cement is cement produced by mixing finely ground blast furnace granulated slag with Portland cement.
  • Blast furnace cement contains a large amount of ground granulated blast furnace slag having latent hydraulic properties that develop hydraulic properties by alkali stimulation, and therefore has a hydration reaction compared to ordinary Portland cement. Slow and less heat generation. That is, the blast furnace cement is slower in strength than ordinary portland cement, and has a lower strength than ordinary portland cement at the beginning of the 3rd to 7th days of material age. Further, the activity at the age of 7 days is about 60 to 80%, and the calorific value per unit time is small.
  • the strength of the aging of 28 days is almost the same as that of ordinary Portland cement, and the long-term strength of blast furnace cement may exceed that of ordinary Portland. Therefore, cracking of a large concrete structure can be effectively suppressed by using blast furnace cement.
  • the activity of blast furnace cement is an index of the compressive strength of mortar samples using blast furnace cement, based on the compressive strength of mortar samples using ordinary Portland cement with the same mass ratio as blast furnace cement. Is.
  • blast furnace granulated slag used as a cement raw material has been conventionally required to have a certain basicity or higher for cement quality control.
  • Slag basicity [(CaO + Al 2 O 3 + MgO) / SiO 2 ] (hereinafter simply referred to as “basicity” or “JIS basicity”) defined in the industry standard (JIS) is used as an index.
  • CaO, Al 2 O 3 , MgO, and SiO 2 are the contents (mass%) of the respective oxides in the blast furnace granulated slag.
  • Patent Document 1 blast furnace granulated slag being produced at a water granulation equipment is sampled, and CaO, Al 2 O 3 , MgO, and SiO 2 are quantitatively analyzed to obtain basicity. Based on this, a technology for determining the quality rank of granulated blast furnace slag has been proposed.
  • Patent Document 2 discloses a base for blast furnace slag powder (a mixture of granulated blast furnace slag and blast furnace slag as a starting material or a rock wall or a rock wool waste slag) used as a raw material for low heat slag cement. A technique for adjusting the degree to 1.4 to 1.8 has been proposed.
  • the activity index is used as an index for measuring the quality of blast furnace granulated slag as a blast furnace cement raw material, and the hydration characteristics and strength development characteristics of blast furnace granulated slag can be evaluated by the activity index.
  • the activity index is 1: 1 (50%: 50% (mass% ratio)) of ground granulated blast furnace slag and regular Portland cement obtained by pulverizing ground granulated blast furnace slag with a specific surface area.
  • the strength A (N / mm 2 ) of the blast furnace cement blended (mixed) and the strength B (N / mm 2 ) of ordinary Portland cement were measured by a mortar test, and calculated by the following formula based on the measured values. It is what is done.
  • the test in Japan for measuring the activity index is conducted under a temperature condition of 20 ° C. for both cement kneading and curing as specified in JIS A 6206. Also, in the strength test of blast furnace cement and ordinary Portland cement, the bending strength and compressive strength are measured after kneading and curing at 20 ° C. From the viewpoint of suppressing cracks in large concrete structures, the activity of blast furnace cement is usually about 60 to 80% at the age of 3-7 days, and the activity at the age of 28 is about 90 to 110%. It is preferable to do.
  • the activity index is closely related to the basicity of blast furnace granulated slag, and the higher the basicity of blast furnace granulated slag, the higher the activity index. Therefore, conventionally, when selecting blast furnace granulated slag for blast furnace cement raw material using basicity as an index, a correlation between basicity and activity index is obtained in advance, and a numerical range of basicity serving as an index is set.
  • the activity index of granulated blast furnace slag pulverized to a specific surface area was measured for blast furnace granulated slag having various chemical compositions, and the basicity and activity of blast furnace granulated slag were measured. Find the correlation with the index.
  • a numerical range that serves as a standard for basicity of blast furnace granulated slag for obtaining a desired activity index that is, blast furnace granulated slag suitable for a raw material of blast furnace cement, is determined based on the above correlation.
  • the blast furnace granulated slag which satisfies the standard of basicity determined in this way is selected as a blast furnace granulated slag for blast furnace cement.
  • Patent Document 3 proposes a technique for evaluating the quality of blast furnace slag using an index different from the basicity. This technique is based on the knowledge that MnO and TiO 2 in blast furnace slag greatly affect the activity index, and is an index ((CaO + Al 2) considering the contents of MnO and TiO 2 in addition to conventional basicity. O 3 + MgO) / SiO 2 ⁇ 0.13 ⁇ TiO 2 ⁇ 1.0 ⁇ MnO) is used to evaluate the quality of blast furnace slag.
  • blast furnace granulated slag having a low hydration reaction rate and a low hydration exothermic rate in utilizing the low exothermic property that is an advantage of blast furnace cement Is preferably used as a raw material.
  • the conventional technology described above cannot select blast furnace granulated slag suitable for cement raw materials for high-temperature areas where the temperature is higher than that of Japan. Therefore, according to the prior art, although a blast furnace cement exhibiting desired characteristics (strength characteristics, low exothermic property) in Japan can be obtained, a blast furnace cement that necessarily exhibits desired characteristics in a country belonging to a high temperature region where the temperature is higher than Japan. Cannot be obtained.
  • the object of the present invention is to advantageously solve the above-mentioned problems of the prior art, and to provide a granulated blast furnace slag for cement raw material and a method for selecting the same for regions having a temperature higher than that of Japan.
  • blast furnace granulated slag for cement raw material suitable for use in a high temperature area where the annual average temperature is 22 ° C. or more, and the initial strength increase rate is not faster than that of normal Portland cement
  • the inventors of the present invention first examined the reason why conventional blast furnace granulated slag suitable for cement raw materials for high-temperature areas having an average annual temperature of 22 ° C. or higher cannot be selected. As a result, the prior art has found that the main reason is that the temperature at which the test for measuring the activity index is performed is not appropriate.
  • the activity index greatly depends on the temperature at which the mortar sample is kneaded and cured.
  • the hydration reaction of cement is known to be affected by temperature, and the hydration reaction proceeds faster as the temperature increases.
  • the test for measuring the activity index in Japan is carried out under the temperature condition of 20 ° C. for both cement kneading and curing as defined in JIS A 6206. Also, in the strength test of blast furnace cement and ordinary Portland cement, the bending strength and compressive strength are measured after kneading and curing at 20 ° C. In the prior art, the correlation between the chemical composition (or basicity) of the granulated blast furnace slag and the activity index is obtained based on the activity index obtained when the test temperature is 20 ° C. as described above. ing.
  • the inventors first kneaded and cured the sample at a temperature higher than 20 ° C. using a ground granulated blast furnace slag powder having a basicity of 1.86 as a raw material, and mixed cement (blast furnace The strength characteristics of the cement were investigated.
  • ordinary portland cement not mixed with ground granulated blast furnace slag was kneaded and cured at a temperature higher than 20 ° C., and the strength characteristics were investigated.
  • the basicity of 1.86 is a typical value included in the basicity range of ground granulated blast furnace slag widely used as a blast furnace cement raw material in Japan.
  • the strength of the blast furnace cement when the ground granulated blast furnace slag powder with a basicity of 1.86 is kneaded and cured at 20 ° C. is the substitution rate of the granulated blast furnace slag powder (mixing in the mixed cement).
  • it is usually 60 to 80% of normal Portland cement (same as normal Portland cement blended with blended cement, the same shall apply hereinafter) at 3 to 7 days of age, and ordinary Portland cement at 28 days of age. It is about 90 to 110% of the average, and it is about 100 to 120% of ordinary Portland cement when the material age is 91 days (all when the strength test is performed at 20 ° C.).
  • High initial strength means that the hydration reaction is fast and the calorific value is large, and that when used for concrete with a large volume, it means that the advantages of low exothermic property of granulated blast furnace slag cannot be utilized.
  • mixed cement made from high basicity blast furnace granulated slag which is considered suitable as a raw material for blast furnace cement in Japan, is kneaded and cured in areas with higher temperatures than Japan, such as Southeast Asia, Africa, and Latin America.
  • the hydration reaction proceeds rapidly because of the high temperature atmosphere, and the amount of heat generated by the reaction increases. As a result, the temperature inside the concrete becomes high and surface cracks are likely to occur.
  • the present inventors have further studied, when the chemical composition of blast furnace granulated slag and the mixed cement using each blast furnace granulated slag as a raw material is kneaded and cured at a high temperature of 22 ° C or higher The relationship between strength and activity index was investigated and examined. And the search method of the granulated blast furnace slag which can manufacture a low exothermic blast furnace cement in the high temperature area
  • the present invention has been completed based on the above findings, and the gist thereof is as follows.
  • the annual average temperature is 22 ° C. or higher, with the chemical composition satisfying the following formula (1) in which the content (mass%) of CaO, Al 2 O 3 , MgO, SiO 2 , TiO 2 and MnO is satisfied.
  • Blast furnace granulated slag for cement raw materials for high temperature areas 1.17 ⁇ B M ⁇ 1.35 (1)
  • B M (CaO + Al 2 O 3 + MgO) / SiO 2 ⁇ 0.13 ⁇ TiO 2 —MnO (CaO, Al 2 O 3 , MgO, SiO 2 , TiO 2 and MnO are blast furnace water. It is content (mass%) of each oxide contained in crushed slag.
  • B M (CaO + Al 2 O 3 + MgO) / SiO 2 ⁇ 0.13 ⁇ TiO 2 —MnO (CaO, Al 2 O 3 , MgO, SiO 2 , TiO 2 and MnO are blast furnace water. It is content (mass%) of each oxide contained in crushed slag.
  • blast furnace granulated slag for a cement raw material of the present invention even in a region where the temperature is higher than that of Japan, it is possible to take advantage of the low hydration reaction rate and hydration exothermic rate of the blast furnace granulated slag. Therefore, according to the present invention, it is possible to obtain blast furnace cement, concrete, and the like having desired characteristics of low heat generation, low initial strength, and high long-term strength.
  • the method for selecting granulated blast furnace slag for cement raw material of the present invention it is used for blast furnace cement, blast furnace granulated slag fine powder, or mixed cement containing fine blast furnace slag fine powder for regions having a higher temperature than Japan. Blast furnace granulated slag can be obtained.
  • FIG. 1 is a diagram showing the strength test results of a mortar sample kneaded and cured at 27 ° C. for blast furnace cement (mixed cement) obtained by mixing granulated blast furnace slag powder (GGBFS) with ordinary Portland cement (OPC).
  • B M (CaO + Al 2 O 3 + MgO) / SiO 2 ⁇ 0.13 ⁇ TiO 2 —MnO).
  • the blast furnace granulated slag for cement raw material of the present invention is a blast furnace granulated slag for cement raw material for a high temperature region having an annual average temperature of 22 ° C. or more, and is CaO, Al 2 O 3 , MgO, SiO 2 , TiO 2 and MnO. It is essential that the content (mass%) of the material has a chemical composition satisfying the following formula (1).
  • B M (CaO + Al 2 O 3 + MgO) / SiO 2 ⁇ 0.13 ⁇ TiO 2 —MnO (CaO, Al 2 O 3 , MgO, SiO 2 , TiO 2 and MnO are blast furnace water. It is content (mass%) of each oxide contained in crushed slag.
  • blast furnace granulated slag having an appropriate chemical composition is selected according to the actual situation in a region having a high temperature to obtain a blast furnace granulated slag for a cement raw material for a high temperature region.
  • the strength of the mixed cement (normal blast furnace cement and blast furnace granulated slag fine powder mixed at a mass ratio of 80:20) when kneaded and cured at 27 ° C. is kneaded and cured at 27 ° C.
  • 80 to 100% of ordinary Portland cement at the initial strength of 7 days of age 90 to 105% of ordinary Portland cement at the strength of 28 days of age
  • 91 of age Blast furnace granulated slag is selected so as to obtain a mixed cement that is 100 to 110% of ordinary Portland cement in the long-term strength of the day, and this blast furnace granulated slag is used as a cement raw material granulated blast furnace slag for high temperature areas.
  • blast furnace granulated slag having such characteristics is used as a raw material, it has the desired characteristics of low heat generation, low initial strength, and high long-term strength in a high temperature region where the annual average temperature is 22 ° C. or higher.
  • Blast furnace cement is obtained.
  • the Blaine value of the granulated blast furnace granulated slag to be blended is selected in the range of about 3000 to 4500 cm 2 / g based on the specifications of the cement product manufacturer, as usual.
  • blast furnace cement in which ordinary Portland cement and ground granulated blast furnace slag powder are mixed at a mass ratio of 80:20 is mainly described, but the blast furnace granulated slag for cement raw material of the present invention is an object.
  • the blending of the mixed cement is not limited to this.
  • blast furnace granulated slag fine powder is blended in a mass ratio of 40-50% or more, the hydration reaction rate and hydration exothermic rate of blast furnace granulated slag fine powder are low, and the long-term strength is high. Becomes even more prominent.
  • the blending ratio of ordinary Portland cement and ground granulated blast furnace slag may be changed as appropriate according to the desired strength characteristics, and it does not hinder the use of other cement admixtures such as fly ash. If the blast furnace granulated slag for a cement raw material of the present invention is used, in any of these cases, the hydration reaction of the ground granulated blast furnace slag powder is prevented from excessively proceeding at an early stage due to a high temperature environment.
  • Blast furnace granulated slag contains CaO, Al 2 O 3 , MgO, and SiO 2 as main components.
  • the activity (strength characteristic) of the blast furnace cement is closely related to the basicity of the granulated blast furnace slag calculated by “(CaO + Al 2 O 3 + MgO) / SiO 2 ”.
  • blast furnace granulated slag contains MnO and TiO 2 derived from raw ores and auxiliary materials as inevitable impurities in addition to the above main components, and these impurities also have a great influence on the strength characteristics (activity) of blast furnace cement. give.
  • the contents of the impurities in the granulated blast furnace slag are usually MnO; about 0.2 to 0.6% by mass, TiO 2 ; about 0.5 to 0.8% by mass.
  • the activity (strength characteristics) of the blast furnace cement tends to decrease.
  • the index B M is less than 1.17, it is confirmed that the initial strength and long-term strength of the mixed cement may be significantly reduced even in regions where the annual average temperature is 22 ° C or higher, which is higher than Japan. It was done.
  • blast furnace cement having extremely low long-term strength is used for a concrete structure, there is a concern that the durability of the structure is lowered.
  • granulated blast furnace slag with an index B M of 1.20 or more and 1.30 or less is suitable.
  • the content of MnO is preferably 0.3% by mass or more and 0.8% by mass or less, and the content of TiO 2 is 0. It is preferable that it is 5 mass% or more and 2.0 mass% or less.
  • the granulated blast furnace slag normally contains MnO and TiO 2 derived from raw ores and auxiliary raw materials. These MnO and TiO 2 have a great effect of suppressing the hydration reaction of cement, that is, the effect of delaying the hydration reaction rate. Therefore, if blast furnace granulated slag with a high content of MnO or TiO 2 is used as a raw material for blast furnace cement, the initial strength of the blast furnace cement may be reduced in Japan. Reduced to 0.8 wt% or less; this reason, Japanese cement material for blast furnace slag is generally the content of MnO and TiO 2, respectively, MnO; 0.6 wt% or less, TiO 2 Has been.
  • the contents of MnO and TiO 2 are preferably MnO; 0.3% by mass or more, and TiO 2 ; 0.5% by mass or more, respectively.
  • MnO contents of MnO and TiO 2 in the granulated blast furnace slag
  • MnO contents of MnO and TiO 2 in the granulated blast furnace slag
  • TiO 2 more than 2.0% by mass.
  • the MnO content and the TiO 2 content of the granulated blast furnace slag are MnO: 0.3% by mass or more and 0.8% by mass or less, TiO 2 : 0.5% by mass or more.
  • the content is preferably 0% by mass or less.
  • MnO may be 1.0 mass% or less.
  • MnO: 0.4 mass% or more and 0.6 mass% or less, TiO 2 : 0.5 mass% or more and 1.2 mass% or less is intended to improve the long-term strength within the appropriate range of the initial strength. Is more preferable.
  • blast furnace granulated slag having a chemical composition satisfying the above formula (1) more preferably, in addition to satisfying the above formula (1), the MnO content is 0.3% by mass or more and 0.0.
  • the blast furnace granulated slag having a chemical composition of 8% by mass or less and a TiO 2 content of 0.5% by mass or more and 2.0% by mass or less it exhibits low exothermic property in a region of higher temperature than Japan, A blast furnace cement having a relatively low initial strength and a high long-term strength can be obtained. Therefore, by selecting blast furnace granulated slag having the above chemical composition, it is possible to select blast furnace granulated slag suitable for a cement raw material used in a high temperature area having an annual average temperature of 22 ° C. or higher.
  • ⁇ High temperature areas with an annual average temperature of 22 ° C or higher are in the range of 15 to 35 ° C in terms of the average monthly temperature on the whole of the earth, and concrete using mixed cement may be constructed in this temperature range.
  • the strength characteristics of the mixed cement when kneaded and cured at 27 ° C. have been described.
  • the temperature is 15 to 35 ° C. In the range, it is possible to realize the desired strength characteristics that the initial strength at the age of 7 days or less is equivalent or less, and the long-term strength at the age of 91 days or more is equivalent or better than ordinary Portland cement. Also in the above, good strength characteristics can be obtained in this temperature range.
  • Blast furnace granulated slag generated at every brewing from the blast furnace is collected and quality controlled by chemical components, and blast furnace granulated slag of various chemical components shown in Table 1 is pulverized in a mill of a fine powder manufacturing plant to produce blast furnace water
  • the activated blast furnace slag fine powder was measured as an activity index by mortar.
  • the collected blast furnace granulated slag was obtained under the following blast furnace operating conditions and granulated conditions.
  • Pig iron production 10000-11000ton / day
  • Slag ratio 290-300kg / molten iron-ton
  • Hot metal temperature 1480-1515 ° C
  • Water temperature during granulation treatment 60-80 ° C (Mass of water at the time of water granulation treatment) / (mass of slag); 10 to 25 Blast furnace granulated slag generated from 400 to 500 tons per brewery was managed separately for each brewery and transported to the blast furnace granulated slag fine powder manufacturing plant.
  • a vertical roller mill having a grinding capacity of 50 ton / Hr was used.
  • the target brane value of granulated blast furnace slag powder was 4200 ⁇ 100 cm 2 / g, and no gypsum was added.
  • the blast furnace granulated slag fine powder for activity index measurement was extract
  • FIG. 1 shows the relationship between age and compressive strength in a sample of kneaded and cured at 27 ° C. of mixed cement (test mortar) and ordinary Portland cement (reference mortar).
  • the mixed cement made from the granulated blast furnace slag of the comparative example whose index B M is 1.46 is stronger than ordinary Portland cement (OPC) until the age of 28 days, As a result, the strength is lower than that of ordinary Portland cement (OPC), and long-term strength improvement is not observed.
  • FIG. 2 shows the relationship between the index B M of blast furnace granulated slag and the activity index.
  • the activity index here is a mixture of test mortar prepared using mixed cement (blast furnace cement) obtained by mixing ordinary Portland cement and ground granulated blast furnace slag at a mass ratio of 80:20 at 27 ° C.
  • OPC ordinary Portland cement
  • the example of the present invention that is, the mixed cement made from granulated blast furnace slag having an index B M of 1.17 or more and 1.35 or less, has an activity index of about 100% or less at 7 days of age and 28 days of age. Although it is over 100% at the age of 91 days, it has higher strength than ordinary Portland cement (OPC) in the long term.
  • OPC ordinary Portland cement
  • the activity index at 7 days of age and 28 days of material is over 100%, and kneaded at 27 ° C.
  • the initial strength is excessively high.
  • the activity index is less than 100%, and when kneaded and cured at 27 ° C., the strength is lower than that of ordinary Portland cement (OPC) in the long term.
  • OPC ordinary Portland cement
  • the activity index at age 7 is less than 80%, and the activity index at age 28 is 90%.
  • the activity index of 91 days of age is significantly lower than 100%.
  • blast furnace granulated slag with high basicity JIS basicity; 1.80 to 1.90, index B M ; 1.40 to 1.60
  • JIS basicity 1.80 to 1.90, index B M ; 1.40 to 1.60
  • the initial strength is higher and the initial heat generation rate is larger, so cracking is likely to occur and this causes a decrease in the long-term strength of the cement. Absent.
  • the index B M of the granulated blast furnace slag is too low, there is a problem that the initial strength of the cement becomes insufficient even if it is assumed to be used in a high temperature region. That is, it can be understood that blast furnace granulated slag for cement raw materials for regions with higher temperatures than Japan such as Southeast Asia has an appropriate range for the index B M that varies depending on the chemical composition.
  • each content is MnO; 0.8 mass% or less, TiO 2 ; If it is in the range of 2.0% by mass or less and the index B M is in the proper range, the decrease in the activity index is in the proper range, and the decrease in the initial strength of the cement may not be a problem. Understandable.
  • the long-term strength is improved when the content of MnO and TiO 2 is high and the index B M is in an appropriate range. Therefore, it can be understood that the evaluation by the index B M is also effective in the selection of granulated blast furnace slag for cement raw materials for high-temperature areas.
  • the chemical composition of granulated blast furnace slag was analyzed, the index B M was 1.17 to 1.35, the MnO content was 0.3 mass% to 0.8 mass%, TiO
  • blast furnace granulated slag having a chemical composition in which the content of 2 is 0.5% by mass or more and 2.0% by mass or less, cement for high-temperature regions having an average annual temperature of 22 ° C. or more like Southeast Asia It can be understood that the granulated blast furnace slag optimum for the raw material can be obtained.

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PCT/JP2014/003829 2013-07-25 2014-07-18 セメント原料用高炉水砕スラグおよびその選別方法 WO2015011911A1 (ja)

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KR1020157030353A KR20150133272A (ko) 2013-07-25 2014-07-18 시멘트 원료용 고로 수쇄 슬래그 및 그의 선별 방법
CN201480022750.7A CN105143137B (zh) 2013-07-25 2014-07-18 水泥原料用高炉水淬炉渣及其筛选方法
JP2015508915A JP5967294B2 (ja) 2013-07-25 2014-07-18 セメント原料用高炉水砕スラグおよびその選別方法

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JP2016003178A (ja) * 2014-06-20 2016-01-12 宇部興産株式会社 高炉スラグの選別方法及び高炉セメントの製造方法
JP2016180748A (ja) * 2015-03-23 2016-10-13 宇部興産株式会社 高炉スラグの選別方法及び高炉セメントの製造方法
JP2016216343A (ja) * 2015-05-18 2016-12-22 宇部興産株式会社 セメント組成物およびその製造方法
JP2017141135A (ja) * 2016-02-12 2017-08-17 宇部興産株式会社 セメント組成物およびその製造方法
CN108516772A (zh) * 2018-06-25 2018-09-11 深圳市振惠建混凝土有限公司 一种透水混凝土及其制备方法

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JP2008247715A (ja) * 2007-03-30 2008-10-16 Jfe Steel Kk セメント向け高炉水砕スラグの選別方法及びセメント組成物の製造方法

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Publication number Priority date Publication date Assignee Title
JP2016003178A (ja) * 2014-06-20 2016-01-12 宇部興産株式会社 高炉スラグの選別方法及び高炉セメントの製造方法
JP2016180748A (ja) * 2015-03-23 2016-10-13 宇部興産株式会社 高炉スラグの選別方法及び高炉セメントの製造方法
JP2016216343A (ja) * 2015-05-18 2016-12-22 宇部興産株式会社 セメント組成物およびその製造方法
JP2017141135A (ja) * 2016-02-12 2017-08-17 宇部興産株式会社 セメント組成物およびその製造方法
CN108516772A (zh) * 2018-06-25 2018-09-11 深圳市振惠建混凝土有限公司 一种透水混凝土及其制备方法
CN108516772B (zh) * 2018-06-25 2020-10-30 深圳市振惠建混凝土有限公司 一种透水混凝土及其制备方法

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