JP2015210121A - Quality control method of pneumatically-applied mortar - Google Patents
Quality control method of pneumatically-applied mortar Download PDFInfo
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- JP2015210121A JP2015210121A JP2014090340A JP2014090340A JP2015210121A JP 2015210121 A JP2015210121 A JP 2015210121A JP 2014090340 A JP2014090340 A JP 2014090340A JP 2014090340 A JP2014090340 A JP 2014090340A JP 2015210121 A JP2015210121 A JP 2015210121A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 130
- 238000003908 quality control method Methods 0.000 title claims abstract description 37
- 238000005259 measurement Methods 0.000 claims abstract description 73
- 238000000034 method Methods 0.000 claims description 54
- 239000007921 spray Substances 0.000 claims description 11
- 238000005507 spraying Methods 0.000 abstract description 35
- 238000010276 construction Methods 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 238000004898 kneading Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 239000011344 liquid material Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 4
- 238000001739 density measurement Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012615 aggregate Substances 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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Abstract
Description
本発明は、乾式吹付け工法によって吹付けられてなる吹付けモルタルの品質管理を行う吹付けモルタルの品質管理方法に関する。 The present invention relates to a quality control method for sprayed mortar for performing quality control of sprayed mortar sprayed by a dry spraying method.
コンクリート構造物にモルタルを吹付けることによって、コンクリート構造物の補修や補強を行う方法が知られている。具体的には、セメントおよび骨材等の粉体材料と、水および液体混和剤等の液体材料とを、別々に調製した後、それらを吹付け対象となるコンクリート構造物の近傍までホース等で移送する。そして、粉体材料と液体材料とを吹付け用ノズル内で混合しつつ圧縮空気と共に噴射することで、コンクリート構造物にモルタルを吹付ける方法が知られている（乾式吹付け工法）。 A method of repairing or reinforcing a concrete structure by spraying mortar on the concrete structure is known. Specifically, powder materials such as cement and aggregate and liquid materials such as water and liquid admixture are prepared separately, and then they are hose to the vicinity of the concrete structure to be sprayed. Transport. And the method of spraying mortar on a concrete structure is known by spraying with compressed air, mixing powder material and liquid material within the nozzle for spraying (dry spraying method).
このような乾式吹付け工法によって吹付けられてなるモルタル（以下、吹付けモルタルとも記す）については、設計通りの圧縮強度が得られるか否かを確認することが品質管理として要求される。このような品質管理を行う方法としては、吹付けモルタルを硬化させた後、所定のサイズのサンプルを採取し（いわゆるコア抜きを行い）、斯かるサンプルに対して圧縮強度の試験を行うことで、吹付けモルタルが所定の圧縮強度を発現するか否かを確認する品質管理方法が知られている。 Regarding mortar (hereinafter, also referred to as spray mortar) sprayed by such a dry spraying method, it is required as quality control to confirm whether or not the compressive strength as designed can be obtained. As a method for performing such quality control, after the sprayed mortar is cured, a sample of a predetermined size is taken (so-called core removal is performed), and a compressive strength test is performed on the sample. A quality control method for confirming whether or not the sprayed mortar exhibits a predetermined compressive strength is known.
また、他の方法としては、所定サイズの枠体内にモルタルを吹付けて充填した後、枠体内でモルタルを硬化させることで所定サイズのサンプルを作製する。そして、該サンプルに対して圧縮強度の試験を行うことで、吹付けモルタルが所定の圧縮強度を発現するか否かを確認する品質管理方法が知られている（特許文献１参照）。 As another method, after a mortar is sprayed and filled in a frame of a predetermined size, the mortar is cured in the frame to prepare a sample of a predetermined size. And the quality control method which confirms whether a spraying mortar expresses predetermined | prescribed compressive strength by performing the test of compressive strength with respect to this sample is known (refer patent document 1).
しかしながら、上記のような方法では、実際にモルタルを吹付けて所定の材齢まで養生して硬化させ、その後、圧縮強度の試験を行う必要があるため、品質管理の結果を得るまでに長時間を要すると共に、繁雑な作業が必要となる。 However, in the method as described above, it is necessary to actually spray and cure the mortar until it reaches a predetermined age, and then to perform a compressive strength test. Therefore, it takes a long time to obtain a quality control result. And complicated work is required.
そこで、本発明は、吹付け工法によって吹付けられてなる吹付けモルタルの品質管理を施工現場において迅速かつ容易に行うことができる吹付けモルタルの品質管理方法を提供することを課題とする。 Then, this invention makes it a subject to provide the quality control method of the spraying mortar which can perform the quality control of the spraying mortar sprayed by the spraying method quickly and easily in a construction site.
本発明に係る吹付けモルタルの品質管理方法は、乾式吹付け工法によって吹付けられた吹付けモルタルの品質管理を行う吹付けモルタルの品質管理方法であって、所定の圧縮強度を発現する基準モルタルの水分率および密度を測定する基準測定工程と、前記吹付けモルタルの水分率および密度を測定する実測工程と、該実測工程での測定結果と基準測定工程の測定結果とを対比する対比工程とを備えることを特徴とする。 The quality control method for sprayed mortar according to the present invention is a quality control method for sprayed mortar that performs quality control of sprayed mortar sprayed by a dry spraying method, and is a reference mortar that expresses a predetermined compressive strength A standard measurement process for measuring the moisture content and density of the spray, an actual measurement process for measuring the moisture content and density of the sprayed mortar, and a comparison process for comparing the measurement result in the actual measurement process with the measurement result in the standard measurement process It is characterized by providing.
斯かる構成によれば、基準測定工程および実測工程で測定されるモルタルの水分率および密度は、モルタルを硬化させて得られる硬化体の圧縮強度を測定するよりも、迅速かつ容易に測定することが可能である。 According to such a configuration, the moisture content and density of the mortar measured in the reference measurement step and the actual measurement step can be measured more quickly and easily than measuring the compressive strength of the cured product obtained by curing the mortar. Is possible.
そして、基準測定工程を行うことで、所定の圧縮強度を発現する基準モルタルの水分率および密度が把握される。つまり、圧縮強度に対応する水分率および密度が把握される。これにより、実測工程での水分率および密度の測定結果を基準測定工程での水分率および密度の測定結果と対比することで（対比工程）、実測工程で測定対象となる吹付けモルタルの圧縮強度が基準モルタルの圧縮強度を発現するか否かを確認することができる。これにより、吹付けモルタルが所定の圧縮強度を発現するか否かの品質管理を施工現場において容易かつ迅速に行うことができる。 And the moisture content and density of the reference | standard mortar which expresses predetermined | prescribed compressive strength are grasped | ascertained by performing a reference | standard measurement process. That is, the moisture content and density corresponding to the compressive strength are grasped. By comparing the moisture content and density measurement results in the actual measurement process with the moisture content and density measurement results in the standard measurement process (contrast process), the compressive strength of the sprayed mortar to be measured in the actual measurement process It can be confirmed whether or not expresses the compressive strength of the reference mortar. Thereby, quality control of whether or not the sprayed mortar exhibits a predetermined compressive strength can be easily and quickly performed at the construction site.
以上のように、本発明によれば、吹付け工法によって吹付けられてなる吹付けモルタルの品質管理を施工現場において迅速かつ容易に行うことができる。 As described above, according to the present invention, the quality control of the sprayed mortar that is sprayed by the spraying method can be quickly and easily performed at the construction site.
以下、本発明の実施形態について説明する。 Hereinafter, embodiments of the present invention will be described.
本実施形態に係る吹付けモルタルの品質管理方法（以下、品質管理方法とも記す）は、乾式吹付け工法によって吹付けられた吹付けモルタルの品質管理を行うものである。斯かる品質管理方法は、所定の圧縮強度を発現する基準モルタルの水分率および密度を測定する基準測定工程と、前記吹付けモルタルの水分率および密度を測定する実測工程と、該実測工程での測定結果と基準測定工程での測定結果とを対比する対比工程とを備える。 The quality control method for sprayed mortar according to the present embodiment (hereinafter, also referred to as “quality control method”) performs quality control of sprayed mortar sprayed by a dry spraying method. Such a quality control method includes a standard measurement step for measuring the moisture content and density of a reference mortar that expresses a predetermined compressive strength, an actual measurement step for measuring the moisture content and density of the sprayed mortar, A comparison step for comparing the measurement result with the measurement result in the reference measurement step.
基準測定工程において、基準モルタルの水分率および密度を測定する方法としては、特に限定されるものではないが、以下の二つの方法が挙げられる。 In the reference measurement step, the method for measuring the moisture content and density of the reference mortar is not particularly limited, and includes the following two methods.
＜乾式吹付け工法による基準モルタル＞
一の方法としては、まず始めに、セメントおよび骨材等から構成される粉体材料と、水および液体混和剤等から構成される液体材料とを型枠内に吹付けることで基準モルタルを形成する。吹付け条件としては、実測工程で測定対象となる吹付けモルタルを形成する際と同一の吹付け条件（具体的には、吹付け圧や速度等が略同一となる条件）とすることが好ましい。
<Standard mortar by dry spray method>
As one method, first, a standard mortar is formed by spraying a powder material composed of cement and aggregates, etc., and a liquid material composed of water and a liquid admixture into a mold. To do. The spraying conditions are preferably set to the same spraying conditions (specifically, conditions under which the spraying pressure and speed are substantially the same) as in forming the spraying mortar to be measured in the actual measurement process. .
その後、型枠内の基準モルタルからサンプルを採取して重量を測定する。その後、電子レンジ等を用いて、サンプルの重量変化が無くなるまでサンプルを加熱し、加熱後のサンプルの重量を測定する。そして、加熱前のサンプルの重量に対する加熱前後のサンプルの重量差の割合を算出し、算出された割合を基準モルタルの水分率とする。また、上記のサンプルを採取した箇所から所定サイズのコア（具体的には、円柱状のコア）を採取し、重量を測定する。そして、コアのサイズおよび重量からコアの密度を算出し、算出された密度を基準モルタルの密度とする。 Thereafter, a sample is taken from the reference mortar in the mold and the weight is measured. Thereafter, using a microwave oven or the like, the sample is heated until there is no change in the weight of the sample, and the weight of the heated sample is measured. And the ratio of the weight difference of the sample before and behind a heating with respect to the weight of the sample before a heating is calculated, and let the calculated ratio be the moisture content of a reference | standard mortar. Further, a core of a predetermined size (specifically, a cylindrical core) is collected from the location where the sample is collected, and the weight is measured. Then, the density of the core is calculated from the size and weight of the core, and the calculated density is set as the density of the reference mortar.
なお、上記の方法による水分率および密度の測定に伴って、基準モルタルの圧縮強度をＪＩＳ Ａ １１０８に準拠して測定してもよい。具体的には、上記のように基準モルタルから採取したコアを所定の材齢まで養生して硬化体を形成する。そして、該硬化体の圧縮強度を測定し、測定結果を基準モルタルの圧縮強度とする。 In addition, you may measure the compressive strength of a reference | standard mortar based on JISA1108 with the measurement of the moisture content and density by said method. Specifically, the core collected from the reference mortar as described above is cured to a predetermined age to form a cured body. And the compressive strength of this hardening body is measured, and let a measurement result be the compressive strength of a reference | standard mortar.
＜混練による基準モルタル＞
他の方法としては、上記の粉体材料と液体材料とを混練して基準モルタルを形成する。そして、該基準モルタルを内容量（容積）および重量が既知の型枠内に充填し、型枠と基準モルタルとの合計重量を測定する。得られた測定結果から型枠の重量を差し引いた重量（型枠内の基準モルタルの重量）と型枠の内容量（基準モルタルの体積）とから基準モルタルの密度を算出する。また、混練によって形成された基準モルタルからサンプルを採取して重量を測定する。その後、電子レンジ等を用いて、サンプルの重量変化が無くなるまでサンプルを加熱し、加熱後のサンプルの重量を測定する。そして、加熱前のサンプルの重量に対する加熱前後のサンプルの重量差の割合を算出し、算出された割合を基準モルタルの水分率とする。
<Standard mortar by kneading>
As another method, the above-mentioned powder material and liquid material are kneaded to form a reference mortar. Then, the reference mortar is filled into a mold having a known internal volume (volume) and weight, and the total weight of the mold and the reference mortar is measured. The density of the reference mortar is calculated from the weight obtained by subtracting the weight of the mold (the weight of the reference mortar in the mold) from the obtained measurement result and the content of the mold (the volume of the reference mortar). Further, a sample is taken from a reference mortar formed by kneading, and the weight is measured. Thereafter, using a microwave oven or the like, the sample is heated until there is no change in the weight of the sample, and the weight of the heated sample is measured. And the ratio of the weight difference of the sample before and behind a heating with respect to the weight of the sample before a heating is calculated, and let the calculated ratio be the moisture content of a reference | standard mortar.
なお、上記の方法による水分率および密度の測定に伴って、基準モルタルの圧縮強度をＪＩＳ Ａ １１０８に準拠する方法で測定してもよい。具体的には、上記の方法で形成した型枠内の基準モルタルから所定サイズのコアを採取し、該コアを所定の材齢まで養生して硬化体を形成する。そして、該硬化体の圧縮強度を測定し、測定結果を基準モルタルの圧縮強度とする。 Note that the compressive strength of the reference mortar may be measured by a method based on JIS A 1108, along with the measurement of the moisture content and density by the above method. Specifically, a core of a predetermined size is collected from the reference mortar in the mold formed by the above method, and the core is cured to a predetermined age to form a cured body. And the compressive strength of this hardening body is measured, and let a measurement result be the compressive strength of a reference | standard mortar.
実測工程では、乾式吹付け工法によりセメントを吹付ける現場において、セメントおよび骨材等から構成される粉体材料と、水および液体混和剤等から構成される液体材料とを内容量（容積）および重量が既知の型枠内に吹付けることで、吹付けモルタルを型枠内に採取する。採取された吹付けモルタルと型枠との合計重量を測定する。得られた測定結果から型枠の重量を差し引いた重量（型枠内の吹付けモルタルの重量）と型枠の内容量（吹付けモルタルの体積）とから吹付けモルタルの密度を算出する。また、型枠内の吹付けモルタルから採取したサンプルの重量を測定した後、電子レンジ等を用いて重量変化が無くなるまでサンプルを加熱する。そして、加熱前のサンプルの重量に対する加熱前後のサンプルの重量差の割合を算出し、算出された割合を吹付けモルタルの水分率とする。 In the actual measurement process, the powder material composed of cement and aggregates and the liquid material composed of water and liquid admixture, etc., in the site where cement is sprayed by the dry spray method, Spraying mortar is collected in a mold by spraying into a mold of known weight. The total weight of the collected sprayed mortar and the formwork is measured. The density of the sprayed mortar is calculated from the weight obtained by subtracting the weight of the mold (the weight of the sprayed mortar in the mold) from the obtained measurement result and the content of the mold (volume of the sprayed mortar). Further, after measuring the weight of the sample collected from the sprayed mortar in the mold, the sample is heated using a microwave oven or the like until there is no change in weight. And the ratio of the weight difference of the sample before and behind the heating with respect to the weight of the sample before a heating is calculated, and let the calculated ratio be the moisture content of spraying mortar.
対比工程では、基準測定工程で測定された水分率および密度（以下、基準水分率および基準密度とも記す）と、実測工程で測定された水分率および密度（以下、実測水分率および実測密度とも記す）とを対比することで、実測工程で測定対象とした吹付けモルタル（即ち、施工現場で吹付けられた吹付けモルタル）の圧縮強度が、基準測定工程で測定対象とした基準モルタルの圧縮強度と同等であることを確認する。これにより、吹付けモルタルの圧縮強度に関する品質管理を行うことができる。 In the comparison process, the moisture content and density measured in the reference measurement process (hereinafter also referred to as reference moisture content and reference density) and the moisture content and density measured in the actual measurement process (hereinafter also referred to as measured moisture content and measured density). ), The compressive strength of the spray mortar measured in the actual measurement process (that is, spray mortar sprayed at the construction site) is the compressive strength of the reference mortar measured in the standard measurement process. Confirm that it is equivalent. Thereby, quality control regarding the compressive strength of spraying mortar can be performed.
例えば、圧縮強度が既知（具体的には、上記のような測定によって得られる圧縮強度又は配合情報等から推定される圧縮強度）の基準モルタルの基準水分率および基準密度と、実測水分率および実測密度とを対比し、実測水分率および実測密度とが基準水分率および基準密度と同等であることを確認することで、吹付けモルタルが基準モルタルと同等の圧縮強度を発現することが確認される。これにより、吹付けモルタルの圧縮強度に関する品質管理を行うことができる。 For example, the reference moisture content and density of the reference mortar with known compressive strength (specifically, the compressive strength obtained from the above measurement or the compression strength estimated from the blending information, etc.), the measured moisture content and the measured By comparing the density and confirming that the measured moisture content and the measured density are equivalent to the reference moisture content and the reference density, it is confirmed that the sprayed mortar exhibits a compressive strength equivalent to the reference mortar. . Thereby, quality control regarding the compressive strength of spraying mortar can be performed.
又は、基準測定工程において、水分率および密度が異なる複数の基準モルタルを形成し、各基準モルタルに対して、水分率および密度を測定し、対比工程においては、斯かる測定結果に基づく管理図を作成して実測工程の測定結果と対比することで、吹付けモルタルが所望する圧縮強度を発現するか否かを確認し、これにより、吹付けモルタルの圧縮強度に関する品質管理を行うこともできる。 Alternatively, in the reference measurement step, a plurality of reference mortars having different moisture contents and densities are formed, and the moisture content and density are measured for each reference mortar. In the comparison process, a control chart based on the measurement results is prepared. By creating and comparing with the measurement result of the actual measurement process, it is confirmed whether or not the spraying mortar exhibits the desired compressive strength, and thereby quality control regarding the compressive strength of the spraying mortar can be performed.
管理図の作成方法としては、特に限定されるものではないが、例えば、各基準モルタルの水分率の測定結果を所定の範囲で３つ又は４つのグループに分け、各水分率のグループ内で、各基準モルタルの密度の測定結果を所定の範囲で４つ又は５つのグループに分ける。そして、水分率の各グループの範囲を横軸、密度の各グループの範囲を縦軸に記載することで、水分率および密度で区画された複数領域を形成する。そして、各領域に属する基準モルタルの圧縮強度が全て所定値以上である領域を使用可能領域と規定し、他の領域を使用不可領域と規定することで、管理図を作成することができる。なお、管理図としては、特に限定されるものではなく、例えば、図１に示す下記実施例の管理図や、等高線を用いて各領域を画定した管理図等が挙げられる。そして、得られた管理図を用いて品質管理を行う際には、実測水分率および実測密度を管理図と対比し、実測水分率および実測密度が使用可能領域に属するか否かを確認することで、吹付けモルタルが所定値以上の圧縮強度を発現するか否かの品質管理を行うことができる。 The method of creating the control chart is not particularly limited. For example, the measurement result of the moisture content of each reference mortar is divided into three or four groups within a predetermined range, and within each moisture content group, The measurement results of the density of each reference mortar are divided into four or five groups within a predetermined range. Then, by describing the range of each group of moisture content on the horizontal axis and the range of each group of density on the vertical axis, a plurality of regions partitioned by the moisture content and density are formed. A control chart can be created by defining a region where the compression strength of the reference mortar belonging to each region is all equal to or greater than a predetermined value as a usable region and defining other regions as unusable regions. The control chart is not particularly limited, and examples thereof include a control chart of the following embodiment shown in FIG. 1 and a control chart in which each region is defined using contour lines. When quality control is performed using the control chart obtained, the measured moisture content and measured density should be compared with the control chart to check whether the measured moisture content and measured density belong to the usable area. Thus, quality control can be performed as to whether or not the sprayed mortar exhibits a compressive strength of a predetermined value or more.
なお、乾式吹付け工法では、水分率が低い配合であっても、噴射による締め固めの作用によって密度が高い吹付けモルタルが形成される場合がある。また、乾式吹付け工法では、粉体材料および液体材料が空気と共に噴射されるため、密度の低い吹付けモルタルが形成される場合もある。しかしながら、混練による方法で基準モルタルを形成する場合、水分率が低い配合では、基準モルタルの流動性が失われ、水分率および密度を測定する際に型枠に密に充填することが困難となる。つまり、混練によって基準モルタルを形成する場合、吹付けモルタルの水分率および密度を再現できない場合があるため、管理図を作成する際の測定結果が制限され、精度の低い品質管理しか行えない。
そこで、混練によって基準モルタルを形成する場合には、基準モルタルをランマーで打撃するなどして基準モルタルを締め固めて密度を高めるように調節したり、気泡剤や消泡剤や減水剤等を用いて空気の含有量を調節して密度を調節したりすることで、通常の混練によっては得ることができない水分率および密度の基準モルタルを形成することができる。これにより、吹付けモルタルにおける広範囲の水分率および密度を再現することができるため、管理図の精度を向上させることができる。
In the dry spraying method, even when the moisture content is low, spraying mortar having a high density may be formed by the action of compaction by injection. In the dry spraying method, since the powder material and the liquid material are injected together with the air, a spray mortar having a low density may be formed. However, when the reference mortar is formed by the kneading method, the low hydration ratio loses the fluidity of the reference mortar, making it difficult to closely fill the mold when measuring the moisture content and density. . In other words, when the reference mortar is formed by kneading, the moisture content and density of the sprayed mortar may not be reproduced. Therefore, the measurement results when creating the control chart are limited, and only quality control with low accuracy can be performed.
Therefore, when forming the reference mortar by kneading, adjust the reference mortar to increase the density by compacting the reference mortar by hitting the reference mortar with a rammer, or use a foaming agent, antifoaming agent, water reducing agent, etc. By adjusting the air content and adjusting the density, it is possible to form a reference mortar with a moisture content and density that cannot be obtained by ordinary kneading. Thereby, since the moisture content and density of a wide range in spraying mortar can be reproduced, the precision of a control chart can be improved.
以上のように、本発明に係る吹付けモルタルの品質管理方法によれば、吹付け工法によって吹付けられてなる吹付けモルタルの品質管理を施工現場において迅速かつ容易に行うことができる。 As mentioned above, according to the quality control method of the spraying mortar which concerns on this invention, the quality control of the spraying mortar sprayed by the spraying method can be performed quickly and easily at a construction site.
即ち、基準測定工程および実測工程で測定されるモルタルの水分率および密度は、モルタルを硬化させて得られる硬化体の圧縮強度を測定するよりも、容易かつ迅速に測定することが可能である。 That is, the moisture content and density of the mortar measured in the reference measurement process and the actual measurement process can be measured more easily and more quickly than when the compressive strength of the cured product obtained by curing the mortar is measured.
そして、基準測定工程を行うことで、所定の圧縮強度を発現する基準モルタルの水分率および密度が把握される。つまり、圧縮強度に対応する水分率および密度が把握される。これにより、実測工程での水分率および密度の測定結果を基準測定工程での水分率および密度の測定結果と対比することで（対比工程）、実測工程で測定対象となる吹付けモルタルの圧縮強度が基準モルタルの圧縮強度を発現するか否かを確認することができる。これにより、吹付けモルタルが所定の圧縮強度を発現するか否かの品質管理を容易かつ迅速に行うことができる。 And the moisture content and density of the reference | standard mortar which expresses predetermined | prescribed compressive strength are grasped | ascertained by performing a reference | standard measurement process. That is, the moisture content and density corresponding to the compressive strength are grasped. By comparing the moisture content and density measurement results in the actual measurement process with the moisture content and density measurement results in the standard measurement process (contrast process), the compressive strength of the sprayed mortar to be measured in the actual measurement process It can be confirmed whether or not expresses the compression strength of the reference mortar. Thereby, quality control of whether or not the sprayed mortar exhibits a predetermined compressive strength can be easily and quickly performed.
以下、本発明の実施例について説明する。 Examples of the present invention will be described below.
＜実施例１＞
１．基準測定工程
使用材料が同一の複数の基準モルタル（３６個のサンプル）を上述の乾式吹付け工法によって形成した。そして、各基準モルタルに対して、上記の方法によって基準水分率および基準密度を測定した。また、各基準モルタルの圧縮強度を上記の方法で測定した。各基準モルタルの基準水分率、基準密度および圧縮強度は、下記表１に示す。
<Example 1>
1. Reference Measurement Step A plurality of reference mortars (36 samples) having the same material used were formed by the above-described dry spray method. And with respect to each reference mortar, the reference moisture content and the reference density were measured by the above method. Moreover, the compressive strength of each reference | standard mortar was measured by said method. The standard moisture content, standard density and compressive strength of each standard mortar are shown in Table 1 below.
２．対比工程
（１）管理図の作成
各基準モルタルの基準水分率および基準密度を、表２に示すように、所定の水分率の範囲で３つのグループに分ける。加えて、表３に示すように、各水分率のグループ内の測定結果を所定の密度の範囲で５つのグループに分ける。そして、各水分率のグループにおける各密度のグループに属するサンプルのうちで圧縮強度が４０Ｎ／ｍｍ２以上となるものの割合を算出する。そして、表３の結果から図１に示す管理図を作成した。なお、図１に示す管理図では、４０Ｎ／ｍｍ２以上となるものの割合が１００％となる領域を使用可能領域Ａとし、７５％以上１００％未満をＢとし，５０％以上７５％未満をＣとした。
2. Contrast process (1) Preparation of control chart As shown in Table 2, the reference moisture content and the reference density of each reference mortar are divided into three groups within a predetermined moisture content range. In addition, as shown in Table 3, the measurement results within each moisture percentage group are divided into five groups within a predetermined density range. Then, a ratio of samples having a compressive strength of 40 N / mm 2 or more among samples belonging to each density group in each moisture content group is calculated. And the control chart shown in FIG. 1 was created from the results of Table 3. In the control chart shown in FIG. 1, an area where the ratio of 40 N / mm 2 or more is 100% is used area A, 75% or more and less than 100% is B, and 50% or more and less than 75% is C. It was.
（２）対比
そして、実際に乾式吹付け工法によるモルタルの吹付けを行う現場で、上記の方法（実測工程）で採取し測定した吹付けモルタルの実測水分率および実測密度を、図１の管理図と対比した場合には、実測水分率および実測密度が使用可能領域Ａに属するか否かを確認する。実測水分率および実測密度が使用可能領域Ａに属する場合には、吹付けモルタルが４０Ｎ／ｍｍ２以上の圧縮強度を発現するものであり、他の領域に属する場合には、吹付けモルタルの発現する圧縮強度が４０Ｎ／ｍｍ２未満となる。
これにより、吹付けモルタルが所定の圧縮強度を示すものであるかの品質管理を行うことができる。
(2) Contrast And, at the site where mortar is actually sprayed by the dry spray method, the measured moisture content and measured density of the sprayed mortar collected and measured by the above method (actual measurement process) are managed as shown in FIG. When compared with the figure, it is confirmed whether or not the actually measured moisture content and the actually measured density belong to the usable area A. When the measured moisture content and measured density belong to the usable area A, the sprayed mortar expresses a compressive strength of 40 N / mm 2 or more, and when it belongs to another area, the sprayed mortar is expressed. Compressive strength to be less than 40 N / mm 2 .
Thereby, quality control can be performed to determine whether the sprayed mortar exhibits a predetermined compressive strength.
＜実施例２＞
基準モルタルを作成する方法が混練による方法であること以外は、上記の実施例１と同様に管理図を作成し品質管理を行うことができる。
<Example 2>
Except that the method for creating the reference mortar is a method by kneading, a control chart can be created and quality control can be performed in the same manner as in the first embodiment.
混練による方法で基準モルタルを形成した場合の水分率および密度としては、下記表４に示す。測定例１〜１０は、混練による方法で形成した基準モルタルの測定結果であり、測定例１１〜１３は、発泡剤を用いたこと以外は測定例１〜１０と同様の配合で形成した基準モルタルの測定結果である。また、測定例１４〜１６は、測定例１〜１０と同様の配合で形成した基準モルタルをランマーで打撃して締め固めた後、測定を行った結果である。 The moisture content and density when the reference mortar is formed by the kneading method are shown in Table 4 below. Measurement Examples 1 to 10 are measurement results of reference mortar formed by a kneading method, and Measurement Examples 11 to 13 are reference mortars formed by the same composition as Measurement Examples 1 to 10 except that a foaming agent was used. It is a measurement result. In addition, Measurement Examples 14 to 16 are the results of measurement after striking and compacting a reference mortar formed with the same composition as Measurement Examples 1 to 10 with a rammer.
測定例５と測定例１１〜１３とを比較すると、水分率が同一であっても測定例１１〜１３の方が密度が低いことが認められる。つまり、基準モルタル中の空気の含有量を調節することで、水分率が同一であっても密度の異なる基準モルタルを形成することができる。また、測定例１〜３と測定例１４〜１６とを比較すると、水分率が同一であっても測定例１４〜１６の方が密度が高いことが認められる。つまり、基準モルタルを締め固めることで、水分率が同一であっても密度の異なる基準モルタルを形成することができる。
以上のように、基準モルタルの空気の含有量や締め固め度合いを調節することで、密度の異なる基準モルタルを形成することができるため、空気の含有量や締め固めによる調節を行わずに混練による方法で形成した基準モルタルを用いて管理図を作成する場合よりも、管理図の作成に用いる基準モルタルを増加させることができる。これにより、混練による方法で基準モルタルを形成した場合であっても、管理図の精度を向上させることができる。
When the measurement example 5 and the measurement examples 11 to 13 are compared, it is recognized that the measurement examples 11 to 13 have a lower density even if the moisture content is the same. That is, by adjusting the content of air in the reference mortar, reference mortars having different densities can be formed even if the moisture content is the same. Moreover, when the measurement examples 1 to 3 and the measurement examples 14 to 16 are compared, it is recognized that the measurement examples 14 to 16 have higher density even if the moisture content is the same. That is, by compacting the reference mortar, reference mortars having different densities can be formed even if the moisture content is the same.
As described above, by adjusting the air content and the degree of compaction of the reference mortar, it is possible to form a reference mortar having a different density. The reference mortar used for creating the control chart can be increased as compared with the case where the control chart is created using the reference mortar formed by the method. Thereby, even if it is a case where reference mortar is formed by the method by kneading | mixing, the precision of a control chart can be improved.
Claims (1)
所定の圧縮強度を発現する基準モルタルの水分率および密度を測定する基準測定工程と、前記吹付けモルタルの水分率および密度を測定する実測工程と、該実測工程での測定結果と基準測定工程の測定結果とを対比する対比工程とを備えることを特徴とする吹付けモルタルの品質管理方法。 A quality control method for sprayed mortar for performing quality control of sprayed mortar sprayed by a dry spray method,
A standard measurement step for measuring the moisture content and density of a reference mortar that expresses a predetermined compressive strength, an actual measurement step for measuring the moisture content and density of the sprayed mortar, a measurement result in the actual measurement step, and a reference measurement step A quality control method for sprayed mortar, comprising a comparison step for comparing measurement results.
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