THE COMPOSITE MECHANISM AND THE ACID RESISTANCE OF POLYMER MODIFIED CALCIUM ALUMINATE CEMENT

ポリマーエマルションを混和したアルミナセメント硬化体の複合化機構と耐酸性

The deterioration of concrete used ordinary Portland cements caused by sulfate acid attack in sewer becomes a serious problem. Calcium aluminate cement is well known for superior sulfuric acid resistance. Also, polymer cement is often used as repairing material, it is necessary to explain the organization mechanism between calcium aluminate cement and polymer emulsion. This study discusses the organization of complex structure as repairing materials, and evaluates the resistance for sulfuric acid and hydrochloric acid. Polymer emulsions were blended in styrene, 2-ethyl hexyl acrylate and methacrylic acid, three emulsions were compounded. Adsorbed amounts and heats of hydration of fresh pastes were measured by top of cement (TOC) and conduction calorimeter respectively. Hardened cements which added emulsion 5mass％ were analyzed by x-ray diffraction (XRD) and electron probe micro analysis (EPMA) for C, Ca and Al. the fraction of mass change and deterioration depth of the hardened mortar immersed in 5mass％ sulfuric acid or hydrochloric acid were measured. When the emulsion with large adsorption to cement particle was used, the delay of hydration is very as large as the twice of no added sample. Such emulsion is not suitable to repairing material. On the other hand, when the emulsion with little adsorption to cement particle was used, the delay of hydration is little and the acid resistance improved. In this polymer cement, it is observed that emulsions were condensed between hydrates.下水道施設では硫酸によるコンクリートの劣化が問題となっている。耐硫酸性を有する補修材料としてアルミナセメントとポリマーエマルションの複合化機構について検討を行うとともに、硫酸と塩酸に対する耐久性の評価を行った。3種のポリマーエマルションを混和したところ、セメント粒子への吸着量が少ないエマルションを混和した場合に、水和の遅延が少なく、耐酸性が向上した。EPMAにより、このポリマーセメントでは、セメント粒子表面ではなく、水和生成物間にエマルションが濃縮していた。

• Record URL:
  • https://doi.org/10.14250/cement.67.333
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=THE+COMPOSITE+MECHANISM+AND+THE+ACID+RESISTANCE+OF+POLYMER+MODIFIED+CALCIUM+ALUMINATE+CEMENT&author=T.+SUGIYAMA&author=K.+TABARA&author=M.+MORIOKA&author=E.+SAKAI&publication_year=2013
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09163182
• Authors:
  • SUGIYAMA, Tomoaki
  • TABARA, Kazuto
  • MORIOKA, Minoru
  • SAKAI, Etsuo
• Publication Date: 2013

Language

• English
• Japanese

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 333-339
• Serial:
  • Cement Science and Concrete Technology
  • Volume: 67
  • Issue Number: 1
  • Publisher: Japan Cement Association
  • ISSN: 0916-3182
  • EISSN: 2187-3313
  • Serial URL: https://www.jstage.jst.go.jp/browse/cement/-char/en
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Adsorption; Aluminates; Calcium compounds; Concrete plastic composites; Hydrochloric acid; Polymer concrete; Sulfuric acid
• Uncontrolled Terms: Acid resistance; Calcium aluminate cement
• Subject Areas: Highways; Materials; I30: Materials;

Filing Info

• Accession Number: 01561964
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Apr 28 2015 3:08PM