JP2008230882A - Fine aggregate for concrete or mortar, method for controlling alkali-aggregate reaction in concrete or mortar, method for controlling alkali-aggregate reaction of fine aggregate for concrete or mortar and granular blast furnace slag for mixing fine aggregate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a fine aggregate for concrete or mortar, by which an alkali-aggregate reaction can be controlled effectively, in which the fine aggregate, which is hardly used up to now and judged to be not harmless, can be used, by which a destruction problem of the environment due to collection of river sand or sea sand can be avoided and in which blast furnace slag to be produced as a by-product in large quantities when pig iron is manufactured can be used effectively. <P>SOLUTION: The fine aggregate for concrete or mortar contains the fine aggregate, which is judged to be not harmless when tested in the alkali-aggregate reaction according to the alkali-silica reactivity test methods (JIS A 1145 and JIS A 1146), and 5-40 wt.% granular blast furnace slag having ≤0.3 mm particle size. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fine aggregate for concrete or mortar that suppresses the risk of alkali-aggregate reaction when used in concrete or mortar, and in particular, to specific fine aggregates used for concrete or mortar. The present invention relates to a fine aggregate for concrete or mortar obtained by mixing a specific amount of blast furnace slag powder particles having a diameter.

  Concrete or mortar is a composite material made of a hardened cement containing aggregate such as crushed stone, but there is a problem that so-called alkali aggregate reaction occurs depending on the characteristics of the aggregate. This alkali-aggregate reaction means that the alkali (mainly alkali in cement) contained in the material constituting the concrete or mortar reacts with the highly reactive aggregate to cause abnormal expansion in the concrete or mortar. A phenomenon that occurs.

  As a method of avoiding the alkali aggregate reaction, conventionally, an aggregate that is determined to be “non-hazardous” with respect to the alkali aggregate reaction based on the alkali silica reactivity test method (JIS A 1145 and JIS A 1146) is not used. In other words, it is a principle to use only aggregates determined to be “innocuous”.

However, it is difficult to eliminate all aggregates that are determined to be “non-harmful” due to geological factors in Japan. When using aggregates that are inevitably determined to be “non-harmful”, The method described in Annex 2 of JIS A 5308, that is,
(1) Regulate the total amount of alkali in concrete,
(2) Use mixed cement that has the effect of suppressing the alkali-silica reaction,
Such a method is mainly adopted.

  On the other hand, methods for utilizing by-products generated in the material industry such as blast furnace slag as fine aggregates are being researched and developed. For example, Patent Document 1 discloses a blast furnace slag fine aggregate and a manufacturing method thereof. Patent Document 2 discloses concrete containing blast furnace slag fine aggregate and limestone crushed sand. Patent Document 3 discloses blast furnace slag fine aggregate-containing concrete using a specific dispersant for blast furnace slag fine aggregate.

JP 2005-219958 A JP 2000-302499 A JP 2001-322853 A

  As a method of avoiding the alkali aggregate reaction, river sand and sea sand are mainly used in the case of not using the aggregate determined to be “non-hazardous”, but recently these natural sands are used. There is a problem of resource depletion, environmental changes such as changes in topography due to the collection of river sand and sea sand, a decrease in the number of living organisms, and diffusion of turbidity. It is thought to occur.

In addition, there is a problem that the method of suppressing alkali-aggregate reaction using a mixed cement such as blast furnace cement or fly ash cement is not a versatile method in terms of strength development, durability, economy, and the like. Moreover, although it is widely known that the blast furnace slag fine powder suppresses expansion due to the alkali aggregate reaction, there is a problem similar to the case where blast furnace cement is used.
In any case, the above-described conventional technique is based on the technical idea of suppressing the alkali aggregate reaction from the cement side, and does not suppress the alkali aggregate reaction from the aggregate side. Also in the concrete containing the blast furnace slag fine aggregate disclosed in Patent Documents 1 to 3, no consideration is given to the alkali aggregate reaction suppression effect.

  On the other hand, the particle size distribution defined in the JIS standard for fine aggregate is 0.15 to 5 mm. As for the particle size of cement such as Portland cement, blast furnace cement, fly ash cement and the like, 0.09 mm residue is 1.0% or less, and 0.032 mm residue is about 15 to 20%. Moreover, even if the blast furnace slag fine powder is used for the suppression of the alkali aggregate reaction as described above, for example, the grain size of the Blaine 4000 grade blast furnace slag fine powder is 1.09% or less in the balance of 0.09 mm, The remaining 0.032 mm is about 5%. Therefore, when these are used as materials or concrete or mortar, 0.032 to 0.09 mm particles are insufficient, and there is a problem that the fresh properties of concrete or mortar are not good.

The present invention has been made from the viewpoint of suppressing alkali-aggregate reaction from the aggregate side in view of the actual state of the background art described above, and can effectively suppress alkali-aggregate reaction. Blast furnaces that can be used with aggregates that have been determined to be "non-hazardous" in the alkaline aggregate reaction that has been made possible, avoid problems due to the collection of river sand and sea sand, and produce a large amount of byproduct during pig iron production Concrete or mortar fine aggregate for effective use of slag, alkali aggregate reaction suppression method for concrete or mortar, alkali aggregate reaction suppression method for concrete or mortar fine aggregate, and blast furnace slag powder for mixing fine aggregate The object is to provide granules.
Another object of the present invention is to supplement the 0.032 to 0.09 mm particles that are incidental to the concrete or mortar to improve the fresh properties of the concrete or mortar.

As a result of intensive studies to achieve the above-mentioned object, the present inventors have found that a blast furnace slag powder having a specific particle size has an excellent alkaline aggregate reaction inhibitory effect and completed the present invention. I let you. That is, the present invention
[1] Fine aggregate for concrete or mortar, characterized in that it contains 5 to 40% by weight of blast furnace slag powder particles having a particle size of 0.3 mm or less, and the remainder is fine aggregate usually used for concrete or mortar. .
[2] The fine blast furnace slag granular material and the remaining fine aggregate are determined to be non-hazardous with respect to the alkali aggregate reaction based on the alkali silica reactivity test method (JIS A 1145 and JIS A 1146). The fine aggregate for concrete or mortar according to the above [1], comprising an aggregate.
[3] A method of suppressing alkali aggregate reaction of concrete or mortar, characterized by using the concrete or fine aggregate for mortar according to any one of [1] to [2]. [4] Concrete or mortar fine aggregates that are determined to be non-hazardous with respect to alkali aggregate reaction based on alkali silica reactivity test methods (JIS A 1145 and JIS A 1146) are alkali aggregate reactions. A method for suppressing alkali aggregate reaction, wherein a fine aggregate containing a blast furnace slag powder for mixing fine aggregate is mixed into the fine aggregate to obtain a fine aggregate that suppresses alkali aggregate reaction. A method for suppressing alkali-aggregate reaction of concrete or mortar fine aggregate.
[5] The concrete or mortar according to [4], wherein the fine aggregate-mixed blast furnace slag powder contains 50% by weight or more of particles having a particle size of 0.3 mm or less. For suppressing alkali-aggregate reaction of fine aggregates.
[6] Along with fine blast furnace slag powder for mixing fine aggregates, fine aggregate that is judged harmless with respect to alkali aggregate reaction based on alkali silica reactivity test method (JIS A 1145 and JIS A 1146) is mixed. The method for suppressing alkali-aggregate reaction of fine aggregate for concrete or mortar according to the above [4] or [5].
[7] A blast furnace slag granule for mixing fine aggregates, which is used in the method for inhibiting alkali aggregate reaction of concrete or mortar fine aggregates according to any one of [4] to [6].

According to the present invention described above, the alkali aggregate reaction of concrete or mortar can be effectively suppressed without considering the cement admixture due to the type of cement, blast furnace slag fine powder, etc. Aggregates that are determined to be “non-hazardous” in the alkali-aggregate reaction can be used, and blast furnace slag produced as a by-product during pig iron production can be used effectively as a resource.
More specifically, without using expensive cement or cement admixture, blast furnace slag powder particles having a particle size of 0.3 mm or less have conventionally been considered to be used as an alkali aggregate reaction. If mixed with aggregate, it can be used as a fine aggregate for concrete or mortar where alkali-aggregate reaction is unlikely to occur, so that inexpensive concrete or mortar can be produced. In particular, since shirasu sand, volcanic ash sand, volcanic rocks, and the like can be used as fine aggregates, useless waste can be converted into useful resources, and natural environment conservation costs and social costs can be reduced. Moreover, 0.032-0.09mm of 0.032-0.09mm which is insufficient in concrete or mortar by making it contain many 0.032-0.09mm particle | grains in the blast furnace slag granular material of 0.3 mm or less, and mixing it. Particles can be replenished, and the effect of improving the fresh properties of concrete or mortar can also be expected.

  Hereinafter, the above-described embodiment of the present invention will be described in detail.

  Blast furnace slag grains are produced by rapidly cooling slag produced as a by-product during extraction of metal from ore during pig iron production by means of air cooling or water cooling, and a glassy solid having a particle size of about 7 mm or less. It is slag. The blast furnace slag granule having a particle size of 0.3 mm or less according to the present invention is prepared by appropriately pulverizing and classifying the blast furnace slag granules.

  The fine aggregate for concrete or mortar according to the present invention contains 5 to 40% by weight of the above blast furnace slag powder, in particular, blast furnace slag powder having a particle size of 0.3 mm or less, and the rest is usually concrete. Or it is a fine aggregate used for mortar, and is not specifically limited. In addition, the particle size value of the lower limit of the blast furnace slag powder is not particularly limited, but it is preferable to include 0.032 to 0.09 mm powder, and the ratio of the powder of this particle size is 0.3 mm. It is preferable that it is about 30 to 60 weight% in the following blast furnace slag granular material. Thereby, the particle size distribution of the fine aggregate from the cement in the concrete or mortar becomes continuous, and the fresh property of the concrete or mortar is improved. The remainder is mainly blast furnace slag powder particles exceeding 0.09 mm and 0.3 mm or less.

  In the present invention, the amount of the blast furnace slag powder particles having a particle size of 0.3 mm or less is particularly defined because the presence of the blast furnace slag powder particles of this particle size in the fine aggregate is particularly alkaline bone. It is because it became clear by the test mentioned later that it was effective in suppression of a material reaction. Further, the blending amount of the blast furnace slag powder having this particle size is 5 to 40% by weight. If the amount is less than 5% by weight, the effect of suppressing the alkali aggregate reaction is not sufficient, and conversely 40% by weight. If the amount exceeds the above, the particle size distribution of the fine aggregate as a whole is remarkably shifted to the small diameter, and there is a problem in the fresh properties such as the fluidity of concrete or mortar using the fine aggregate as it is and the properties of the hardened body. This is because it occurs.

  Further, the fine aggregate for concrete or mortar according to the present invention includes a blast furnace slag fine particle having the above particle size and another fine aggregate, for example, other blast furnace slag fine aggregate having a different particle size, river sand, sea sand, It can contain natural fine aggregates such as land sand, artificial fine aggregates made by crushing rocks and cobblestones, regenerated fine aggregates obtained from waste concrete blocks, etc., especially alkali silica reactivity test method Fine aggregates (reactive fine aggregates) that are determined not to be harmless with respect to the alkali aggregate reaction based on (JIS A 1145 and JIS A 1146) can also be included. Even if reactive fine aggregate is included in the fine aggregate to be used, concrete or mortar alkali aggregate using the fine aggregate can be obtained by including the blast furnace slag powder particles having the predetermined particle size. This is because the reaction is suppressed. Thus, when a reactive fine aggregate is included in the fine aggregate to be used, the effects of the present invention are particularly prominent.

  Examples of substances that may cause the alkali-silica reaction (alkali-aggregate reaction) include siliceous minerals (quartz, cristobalite, tridymite, opal), glass (volcanic glass), silicate minerals (mica, clay minerals), etc. However, fine aggregates containing these minerals, such as shirasu sand, volcanic ash sand, and crushed volcanic rocks, can be used as fine aggregates in the present invention. It is possible to cope with the problem of depletion of high-quality natural fine aggregates such as river sand and sea sand. In addition, recycled fine aggregate made by crushing waste concrete block is highly likely to cause an alkali-aggregate reaction, but the present invention is applied to such recycled fine aggregate to mix blast furnace slag powder particles. Therefore, the alkali aggregate reaction can be suppressed, which is effective for advanced utilization of recycled fine aggregates that will be generated in large quantities in the future.

  The blending amount of the blast furnace slag powder particles having a particle size of 0.3 mm or less in the fine aggregate is within the range of 5 to 40% by weight, and the arical of other fine aggregates into which the blast furnace slag powder particles are mixed. Preferably, the degree of aggregate reactivity is adjusted by preliminary investigation. As this adjustment method, for example, using other fine aggregates to be used, a test in accordance with “Aggregate Alkali Reactivity Test Method (Mortar Bar Method)” described in JIS A 1146, or a simpler acceleration Perform a test, predict whether other fine aggregates to be used are likely to cause an aliquot aggregate reaction, and based on this prediction result, determine the blending amount of blast furnace slag granules into the fine aggregate Good.

  Moreover, the adjustment of the particle size distribution of the concrete or mortar fine aggregate performed as necessary may employ various known methods. The fine aggregate used for the adjustment may be a blast furnace slag fine aggregate or Fine aggregates (harmless fine aggregates) determined to be harmless with respect to the alkali aggregate reaction based on the alkali silica reactivity test method (JIS A 1145 and JIS A 1146) are preferable. That is, for example, the particle size distribution of the fine aggregate after mixing a predetermined amount of a blast furnace slag powder having a particle size of 0.3 mm or less into the reactive fine aggregate to be used or the reactive fine aggregate obtained in advance is examined. The particle size distribution is designed based on the particle size distribution of the blast furnace slag powder and the blast furnace slag fine aggregate or harmless fine aggregate adjusted separately for the particle size range that does not conform to the JIS standard particle size distribution, for example. Add up to the amount you want to adjust.

  In addition, in order to obtain a concrete or mortar fine aggregate containing 5 to 40% by weight of blast furnace slag powder particles of 0.3 mm or less, 50% by weight or more of particles prepared in advance with a particle size of 0.3 mm or less is included. The blast furnace slag powder having a particle size of 0.3 mm or less is used as a reactive fine aggregate in which the blast furnace slag powder granular material (in the present invention, this is called “blast furnace slag powder granule for mixing fine aggregate”) is used. You may carry out by mixing predetermined amount so that a granule may be 5 to 40 weight%. If the fine blast furnace slag powder for mixing fine aggregates does not contain 50% by weight or more of 0.3 mm or less, it is difficult to put it into practical use as a fine aggregate mixed blast furnace slag powder. The remainder exceeds 0.3 mm and is 5 mm or less. Further, as described above, it is preferable that the blast furnace slag powder for mixing fine aggregates contains particles having a particle size of 0.032 to 0.09 mm. Furthermore, it is preferable from the practical aspect to keep the quality such as the particle size distribution of the blast furnace slag powder for mixing fine aggregates within a certain range.

  In this way, if the blast furnace slag granule for mixing fine aggregate with known quality such as particle size distribution is used, the reactive fine aggregate used can be changed to the fine aggregate for concrete or mortar of the present invention, or the JIS standard particle size distribution. It is easy to adjust the particle size so that Further, together with blast furnace slag powder particles, harmless fine aggregates judged to be harmless with respect to alkali aggregate reaction based on alkali silica reactivity test method (JIS A 1145 and JIS A 1146), for example, silica stone, limestone, etc. May be used to adjust the properties and particle size distribution of the reactive fine aggregate.

  Adjustment of concrete or mortar using the above-described concrete according to the present invention or fine aggregate for mortar can be performed in the same manner as general concrete and mortar. That is, slump, air amount, water cement ratio, fine aggregate ratio are set according to the purpose of use, and a predetermined amount of cement to satisfy the set values, blast furnace slag powder granules of 0.3 mm or less according to the present invention Is mixed with fine aggregates, coarse aggregates and water-reducing agents containing a predetermined amount, and if necessary, commonly used admixtures such as dispersants, fillers, antifoaming agents and the like are added, It can be produced by kneading what is added water so as to have a predetermined water cement ratio. The mixing method and kneading method are not particularly limited, and general methods can be used without any problem. Concrete or mortar after kneading can be filled into a mold, demolded and cured by a general manufacturing method to obtain a concrete or mortar structure, a secondary product, or the like.

  The concrete or mortar structure or secondary product using the concrete or mortar fine aggregate according to the present invention has an effect of alkali aggregate reaction due to the presence of the blast furnace slag powder having a predetermined particle size. In this respect, durability is maintained.

  The embodiments of the present invention, such as concrete or mortar fine aggregate, concrete or mortar alkali aggregate reaction suppression method, etc. have been described above, but the present invention is not limited to the embodiments described above. Rather, within the scope of the technical idea of the present invention described in the claims, concrete or mortar fine aggregate, concrete or mortar alkali aggregate reaction suppression method, concrete, Or it is natural that it can be set as the alkali aggregate reaction suppression method of the fine aggregate for mortar, and the blast furnace slag granular material for fine aggregate mixing.

Test example

Next, it describes about the test example (model test) which discovered this invention as reference.
Each test example was conducted in accordance with “Aggregate Alkali Reactivity Test Method (Mortar Bar Method)” described in JIS A1146.

−モルタルの配合−
・モルタルの配合は、重量比でセメント１，水０．５，細骨材２．２５とした。
・１回に練り混ぜるセメント，細骨材，水の量は、次のものとした。
水＋ＮａＯＨ水溶液 ： ３００ｍｌ
セメント ： ６００ｇ
細骨材（表乾） ： １３５０ｇ
・ＮａＯＨ水溶液の量は、セメントの全アルカリがＮａ₂ Ｏ換算で１．２％となるように計算して定めた。
−モルタルの練混ぜ，供試体の作成，養生，長さ変化の測定−
モルタルの練混ぜ、供試体の作成、養生、および長さ変化の測定は、ＪＩＳ Ａ １１４６に記載された「骨材のアルカリ反応性試験方法（モルタルバー法）」に準拠して行った。 -Materials used-
Reactive fine aggregate (land sand)
Quartzite Fine Aggregate Blast Furnace Slag Powder-Particle Size Adjustment-
Each of the above materials used was pulverized and sieved so as to have a particle size distribution shown in Table 1 to adjust the particle size. The particle size was usually determined as the particle size range of concrete or mortar fine aggregate.

-Mortar formulation-
-The mortar was blended in a weight ratio of cement 1, water 0.5, and fine aggregate 2.25.
・ The amount of cement, fine aggregate and water to be mixed at one time was as follows.
Water + NaOH aqueous solution: 300 ml
Cement: 600g
Fine aggregate (surface dry): 1350g
The amount of NaOH aqueous solution was determined by calculating so that the total alkali of the cement was 1.2% in terms of Na ₂ O.
-Mortar mixing, specimen preparation, curing, length change measurement-
Mixing of mortar, preparation of specimens, curing, and measurement of change in length were performed in accordance with “Aggregate Alkali Reactivity Test Method (Mortar Bar Method)” described in JIS A1146.

[Test Examples 1 to 9]
In order to confirm the alkaline aggregate reaction inhibitory effect of the blast furnace slag granule, 100% by weight of the reactive fine aggregate as a fine aggregate, a part of the reactive fine aggregate (25, 50, 75, 100% by weight) was measured for the amount of expansion of each mortar produced for the fine aggregate in which quartzite fine aggregate or blast furnace slag powder was replaced.
Tables 2 and 3 list the proportions of fine aggregate in each test example. In the table, the first numerical value indicates the ratio of “reactive fine aggregate”, the central numerical value indicates the ratio of “silica fine aggregate”, and the final numerical value indicates the mixing ratio of “blast furnace slag granule”. .
Moreover, the measurement result of the expansion amount of the mortar which each used the fine aggregate of the mixture ratio shown in Table 2 in FIG. 1 is shown. Moreover, the measurement result of the expansion amount of the mortar which each used the fine aggregate of the mixture ratio shown in Table 3 in FIG. 2 is shown.

From FIG. 1, when a part of reactive fine aggregate is replaced with quartzite fine aggregate, which is harmless fine aggregate, 25% by weight and 50% by weight are replaced with quartzite fine aggregate. It can be seen that the amount of expansion per month is larger than when the reactive fine aggregate is 100% by weight. This is due to a pessimum phenomenon peculiar to the alkali aggregate reaction. Even when 75% by weight is replaced, it is 0.32% in 6 months, exceeding the 0.10% criterion for “no harm”.
On the other hand, it can be seen from FIG. 2 that in the case of the blast furnace slag granular material, the expansion amount surely decreases as the replacement ratio increases. When the amount is 50% by weight, the amount of expansion is halved. However, considering the pessimum phenomenon, it can be seen that the effect more than the dilution effect is exhibited. And when 75 weight% substitution is carried out and when a reactive fine aggregate is 0 weight%, it turns out that it hardly expands. From the above test results, it was found that the blast furnace slag powder was effective in suppressing expansion due to an alkali aggregate reaction more than a simple dilution effect.

[Test Examples 10 to 14]
In order to confirm which particle size of blast furnace slag granular material greatly contributes to the suppression of expansion by alkali-aggregate reaction, 50% by weight of reactive fine aggregate was replaced with quartzite fine aggregate. Further, the expansion amount of each mortar was measured for fine aggregates in which silica stone fine aggregates of various particle sizes were sequentially replaced with blast furnace slag powder granules.
Table 4 shows the proportions of fine aggregates in each test example.
Moreover, the measurement result of the expansion amount of the mortar which each used the fine aggregate of the mixture ratio shown in Table 4 in FIG. 3 is shown.

[Test Examples 10, 15 to 17, 7]
Similar to the above test, in order to confirm which particle size of the blast furnace slag powder particles greatly contributes to the suppression of the expansion by the alkali aggregate reaction, 50% by weight of the reactive fine aggregate is quartzite fine bone. Measure the amount of expansion of the mortar created for each of the fine aggregates that were replaced with the blast furnace slag powder in order from the ones with small particle size quartzite fine aggregates, based on the ones that were replaced with the aggregates. did.
Table 5 lists the proportions of fine aggregate in each test example.
Moreover, the measurement result of the expansion amount of the mortar which each used the fine aggregate of the mixture ratio shown in Table 5 in FIG. 4 is shown.

[Test Examples 14, 18 to 20, 7]
Similar to the above test, in order to confirm which particle size of the blast furnace slag powder particles greatly contributes to the suppression of the expansion by the alkali aggregate reaction, 50% by weight of the reactive fine aggregate is quartzite fine bone. Measure the amount of expansion of the mortar created for each of the fine aggregates that were replaced with the blast furnace slag powder in order from the ones with the finer quartzite fine aggregates. did.
Table 6 shows the proportion of fine aggregate in each test example.
Moreover, the measurement result of the expansion amount of the mortar which each used the fine aggregate of the mixture ratio shown in Table 6 in FIG. 5 is shown.

From FIG. 3, when 0.15 to 0.3 mm blast furnace slag granules are mixed, a remarkable effect of suppressing the alkali-aggregate reaction is recognized. It can be seen that there is almost no inhibitory effect on the alkali-aggregate reaction.
From FIG. 4, it can be seen that no matter how much blast furnace slag powder particles having a particle size range other than 0.15 to 0.3 mm are mixed, the effect of suppressing the alkali aggregate reaction is not improved.
FIG. 5 shows that the inhibitory effect of alkali-aggregate reaction increases as the blast furnace slag powder having a smaller particle size is mixed.
From the above test results, blast furnace slag granule of 0.3 mm or less has a remarkable effect of suppressing alkali-aggregate reaction, but almost no suppression of blast furnace slag fine aggregate with a particle size range exceeding 0.3 mm. It turns out that there is no effect. This is a very significant finding in using blast furnace slag grains for suppressing alkali-aggregate reaction.

It is the graph which showed the measurement result of the expansion amount of the mortar which each used the fine aggregate of the mixture ratio shown in Table 2. FIG. It is the graph which showed the measurement result of the expansion amount of the mortar which each used the fine aggregate of the mixture ratio shown in Table 3. FIG. It is the graph which showed the measurement result of the expansion amount of the mortar which each used the fine aggregate of the mixture ratio shown in Table 4. It is the graph which showed the measurement result of the expansion amount of the mortar which each used the fine aggregate of the mixture ratio shown in Table 5. It is the graph which showed the measurement result of the expansion amount of the mortar which each used the fine aggregate of the mixture ratio shown in Table 6. FIG.

Claims (7)

  A fine aggregate for concrete or mortar, characterized in that it contains 5 to 40% by weight of blast furnace slag powder particles having a particle size of 0.3 mm or less, and the rest is fine aggregate generally used for concrete or mortar.   Fine aggregate determined to be harmless with respect to the alkali aggregate reaction based on the alkali silica reactivity test method (JIS A 1145 and JIS A 1146) in the blast furnace slag granular material and the remaining fine aggregate. The fine aggregate for concrete or mortar according to claim 1, comprising:   A method for inhibiting alkali aggregate reaction of concrete or mortar, wherein the concrete or mortar fine aggregate according to any one of claims 1 to 2 is used.   Concrete or mortar fine aggregates that are determined to be non-hazardous with respect to alkali-aggregate reaction based on alkali silica reactivity test methods (JIS A 1145 and JIS A 1146) cause alkali-aggregate reaction A method for suppressing alkali-aggregate reaction that suppresses alkali-aggregate reaction by mixing blast furnace slag powder for mixing fine aggregate into the fine aggregate. , Method for suppressing alkali aggregate reaction of fine aggregate for concrete or mortar.   5. The fine aggregate for concrete or mortar according to claim 4, wherein the blast furnace slag powder for mixing fine aggregate contains 50 wt% or more of particles having a particle size of 0.3 mm or less. Of suppressing alkali-aggregate reaction. Together with the above-mentioned fine aggregate blast furnace slag powder, alkali silica reactivity test method (JIS
A fine aggregate determined to be harmless with respect to the alkali aggregate reaction based on A 1145 and JIS A 1146) is mixed, and the alkali bone of the fine aggregate for concrete or mortar according to claim 4 or 5 Material reaction suppression method.   A blast furnace slag powder for mixing fine aggregates, which is used in the method for suppressing alkali aggregate reaction of concrete or mortar fine aggregates according to any one of claims 4 to 6.

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