Hiroharu Sasayama

Title: Hiroharu Sasayama: Innovator in Water-Swellable Materials

Introduction

Hiroharu Sasayama is a notable inventor based in Ageo, Japan. He has made significant contributions to the field of construction materials, particularly in the development of water-swellable caulking materials and waterstops. With a total of four patents to his name, Sasayama's innovations are aimed at enhancing the efficiency and effectiveness of construction joints in concrete.

Latest Patents

One of Sasayama's latest patents is a water-swellable caulking material designed for water-leakage prevention. This inventive material is composed of a rubbery polymer and a highly water-absorptive resin, making it particularly useful in caulking works for construction joints of concrete. Unlike conventional caulking materials, this innovative caulking material features a coating film that is impervious to neutral water but allows water permeability when in contact with alkaline water, such as that found in uncured concrete mixtures. This design prevents premature swelling when inadvertently exposed to water before application, while still enabling prompt expansion upon contact with alkaline mixtures.

Another significant patent is the waterstop, which is utilized to prevent water passage or leakage through construction joints in concrete. This waterstop is shaped like a continuous-length belt and is made from plastic or rubber. It includes a water-swellable rubbery layer that swells with water, effectively sealing the joint. The layer is temporarily protected by a coating film that dissolves in alkaline conditions, ensuring that the waterstop functions optimally when needed.

Career Highlights

Sasayama is associated with C.I. Kasei Company, Limited, where he continues to innovate in the field of construction materials. His work has been instrumental in advancing technologies that address common challenges in construction, particularly those related to water leakage and joint integrity.

Collaborations

Sasayama has collaborated with notable colleagues, including Yuji Ishihara and Shozo Otsugu. Their combined expertise has contributed to the successful development of innovative materials that enhance construction practices.

Conclusion

Hiroharu Sasayama's contributions to the field of water-swellable materials have made a significant impact on construction technology. His innovative patents reflect a commitment to improving the safety and durability of construction joints in concrete.