Our Technology

1. Overview

• In 2018, we constructed a reaction floor made of post-tension prestressed concrete (PC) in the Structural Experimentation Laboratory at our Technology Research Center. The concrete used in this reaction floor was next-generation fly ash cement, AFC®, newly developed by Taiheiyo Cement Corporation, and this was its first construction-related application in Japan.

• The design strength of the reaction floor is 36N/mm2, and, while a relatively high degree of strength and rapid hardening was required due to the introduction of prestress, because this is mass concrete, there was concern about negative effects caused by the extremely high heat of hydration; however, the workability was good, allowing for control of the heat of hydration and the production of absolutely no cracks.

 

 

2. Key Features

• Achieves setting times equivalent to regular cement due to increased initial strength

• Improved long-term strength stability and durability due to increased long-term pozzolanic reaction

• Stable air volume due to reduced ignition loss

 

 

3. Our Construction

• Fuji P.S Technology Research Center Structural Experimentation Laboratory Reaction Floor (2019.2)

 

 

4. Catalogs & Technical Report

• [Technical Report] Construction of Structural Experimentation Laboratory Reaction Floor Using Next-Generation Fly Ash Cement AFC®

• [Paper] Fumika NAKAMURA, Shimpei MAEHORI, Ryuichiro KUGA, Suguru TOKUMITSU: Construction of Mass Concrete Reaction Floor Using Next-Generation Fly Ash Cement, 20th Taiheiyo Cement Group Technical Presentation Conference, 2019.7

• [Paper] Shimpei MAEHORI, Youji OGAWA, Fumika NAKAMURA, Suguru TOKUMITSU: High-C3S Fly Ash Concrete Mixture Selection and In-Plant Quality Confirmation, Japan Society of Civil Engineers 74th Annual Meeting, V-106, 2019.8

• [Paper] Fumika NAKAMURA, Shimpei MAEHORI, Youji OGAWA, Suguru TOKUMITSU: Application of High-C3S Fly Ash Concrete to Mass Concrete, Japan Society of Civil Engineers 74th Annual Meeting, V-107, 2019.8

• [Report] Fumika NAKAMURA, Shimpei MAEHORI, Suguru TOKUMITSU: Application of High-C3S Fly Ash Concrete to Reaction Floor Mass Concrete, Proceedings of the 28th JPCI Symposium on Development in Prestressed Concrete, 2019.11

• [Taiheiyo Cement Information Journal] Suguru TOKUMITSU, Shimpei MAEHORI, Ryuichiro KUGA: CEM’s Construction of Structural Experimentation Laboratory Reaction Floor Using Next-Generation Fly Ash Cement AFC®, No.83, pp4-8, 2019.10