JP2018172235A - 補修材料及び補修方法 - Google Patents
補修材料及び補修方法 Download PDFInfo
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- JP2018172235A JP2018172235A JP2017071416A JP2017071416A JP2018172235A JP 2018172235 A JP2018172235 A JP 2018172235A JP 2017071416 A JP2017071416 A JP 2017071416A JP 2017071416 A JP2017071416 A JP 2017071416A JP 2018172235 A JP2018172235 A JP 2018172235A
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- Prior art keywords
- repair material
- repair
- water
- cement
- calcium
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Abstract
Description
(2)嫌気性微生物として酵母のような胞子形成微生物を用いれば、補修材料の保存性が向上する。
(3)水溶性ポリマーはCaイオンのような陽イオンと反応して架橋する官能基(カルボキシル基、硫酸基など)を有するものであれば特に限定されないが、例えば、アルギン酸、アルギン酸エステル、ペクチン、ジェランガム、ポリ(メタ)アクリル酸、カルボキシメチルセルロース、カラギーナン及びこれらの塩からなる群より1種以上を選択することができる。
(4)補修材料中のカルシウム化合物の含有量を5質量%未満にすれば、使用前の補修材料のゲル化が防止されるので、一液化など取扱いが容易な上、微細なひび割れの深部にまで補修材料を供給することができる。
本発明の補修材料は、嫌気性微生物と水溶性ポリマーとを含むものであれば、その配合割合や他の添加剤など特に限定されない。
嫌気性微生物は、栄養源を直接又は間接的に代謝し、酸素不存在下で二酸化炭素を生成するものであれば特に限定されず、偏性(絶対)嫌気性微生物、通性嫌気性微生物、通性好気性微生物から1種以上を選択して用いることができるが、嫌気代謝効率を考慮すると偏性嫌気性微生物、通性嫌気性微生物が好ましく、取り扱いの簡易さからは通性嫌気性微生物が好ましい。
水溶性ポリマーは、カルシウムイオンとの反応によりゲル化する官能基(カルボキシル基、硫酸基など)を有する物質であれば特に限定されないが、具体的には、アルギン酸(アルギン酸塩、アルギン酸エステルも含む)、ポリ(メタ)アクリル酸、ペクチン、ジェランガム、カルボキシメチルセルロース、カラギーナン及びこれらの塩からなる群より選択される1種以上の水溶性ポリマーを用いることができる。ここで、塩とは、ナトリウムやカリウム等のアルカリ金属塩の他、アンモニウム塩をも含む概念ではあるが、より好ましくはナトリウムとカリウムから選択し、最も好ましくはナトリウム塩である。
本発明の補修材料は、上記嫌気性微生物と水溶性ポリマーに限定されず、他のポリマー(バインダー)、微生物栄養源(有機、無機)、着色剤、フィラー、pH緩衝剤、pH調整剤、老化防止剤、分散剤、界面活性剤など1種以上の添加剤を添加することができる。これらの中でも、最も好ましい添加剤は微生物栄養源である。
本発明の補修材料は、液状、固体(乾燥品)のいずれの形態でもよく、液状の場合は上記嫌気性微生物、水溶性ポリマー、栄養源などの添加剤を、媒質に溶解又は分散させて液状とする。媒質は水と有機溶媒のいずれも用いることができるが、好ましくは水を含有し、より好ましくは水を主成分(50質量%以上)とし、より好ましくは水で構成される。
本発明の補修材料は、コンクリート、モルタル等の多様なセメント系硬化物を利用したセメント系構造物の補修に使用することができる。以下に具体的に説明する。
先ず、補修材料が紛体の場合は媒質に溶解又は分散させて液状とする。補修材料が液状の場合はそのまま使用することもできるが、必要に応じて媒質(水)で希釈して粘度調整をしてから使用することもできる。希釈の有無に関わらず、本発明の補修材料は、水溶性ポリマーと嫌気性微生物とその他成分(特に栄養源)が同じ媒質に溶解又は分散した1液型(1成分型)としてから使用する。
以上は、補修材料に嫌気性微生物を直接添加する場合について説明したが本発明はこれに限定されるものではない。例えば、嫌気性微生物をマイクロカプセルに封入してから補修材料に添加することもできる。
アルギン酸ナトリウム(関東化学株式会社製、鹿1級、カタログNo.37094−01)を蒸留水に添加し、スターラーを用いて30分間撹拌して溶解させ、アルギン酸ナトリウムを1.0質量%含む水溶液を得た。この水溶液1Lに、嫌気性微生物である乾燥酵母(秋田十条化成株式会社製の商品名「白新こだま酵母ドライ」)27.0g/Lと、栄養源であるグルコース0.3mol/Lとを添加して更に30分間攪拌して、実施例1の補修材料とした。
嫌気性微生物と栄養源を添加しない以外は、上記実施例1と同じ条件で比較例1の補修材料とした。これら実施例1、比較例1の補修材料を用いて下記試験を行った。
CEM III 42.5N(EN197−1:2000に基づき分類される高炉セメント)を用い、直径30mm、長さ50mm円柱状であって、その円柱外周側面の円柱中心軸を挟んで対向する位置にひび割れ誘導用ノッチが2本形成されたモルタル硬化物を製造し、円柱供試体とした。
実施例1の補修材料で補修した円柱供試体を透水試験の後、温度50℃の乾燥炉で24時間乾燥させた。乾燥後の円柱供試体にエポキシ樹脂を直接含浸させ、ひび割れ内に形成された補修材料のゲル被膜の変形、変質を防ぐための前処理を施した。更に、円柱供試体を、円柱軸線に沿って、ひび割れと直交する方向に乾式で切断した。
上記E−SEMに用いた円柱供試体からゲル被膜中の析出物を採取し、EDX分析にかけた結果を図4に示す。図4のチャートからCaとCとOの位置にピークが出願しており、微生物の代謝により、ゲル被膜内に炭酸カルシウムが析出することが確認できた。
Claims (5)
- セメント系構造物の補修材料であって、
嫌気性微生物と、
カルシウムイオンと架橋する官能基を有する水溶性ポリマーと、
を含有することを特徴とする補修材料。 - 前記嫌気性微生物は酵母を含む請求項1に記載の補修材料。
- 前記水溶性ポリマーは、アルギン酸、アルギン酸エステル、ペクチン、ジェランガム、ポリ(メタ)アクリル酸、カルボキシメチルセルロース、カラギーナン及びこれらの塩からなる群より選択される1種以上のポリマーからなる請求項1記載の補修材料。
- カルシウム化合物の含有量が5質量%未満である請求項1又は請求項2に記載の補修材料。
- 請求項1〜4のいずれか1項記載の補修材料を用いて、セメント系構造物を補修する補修方法。
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CN112707670A (zh) * | 2019-12-12 | 2021-04-27 | 科之杰新材料集团有限公司 | 一种交联型混凝土粘度调节剂及其制备方法 |
JP2021156023A (ja) * | 2020-03-27 | 2021-10-07 | 戸田建設株式会社 | コンクリートのひび割れ補修方法 |
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JP2017522256A (ja) * | 2014-07-17 | 2017-08-10 | テクニシュ ユニベルシテイト デルフトTechnische Universiteit Delft | セメント材料の製造方法 |
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JP2016525879A (ja) * | 2013-05-17 | 2016-09-01 | テクニシュ ユニベルシテイト デルフトTechnische Universiteit Delft | コンクリートのバイオ系修復方法 |
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CN112707670B (zh) * | 2019-12-12 | 2022-04-22 | 科之杰新材料集团有限公司 | 一种交联型混凝土粘度调节剂及其制备方法 |
JP2021156023A (ja) * | 2020-03-27 | 2021-10-07 | 戸田建設株式会社 | コンクリートのひび割れ補修方法 |
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