KODAMA,inc.

Smart sensor formwork system

Background

Necessity of quality assurance for early age concrete
As the required performance of concrete structures increases, quality control for early age concrete becomes an extremely important factor in long-term durability. In reality, however, differences in surrounding environment and type of use of structures, and constructions' approaches make thoroughgoing quality control for early age concrete difficult, leaving things highlydependent on on-site assessment of circumstances.

Necessity for form materials of resource recycling and reducing waste
The forms currently used in concrete work are mostly plywood panels made of lumber in Southeast Asia, which are used only a few times before being discarded, leads to increased industrial waste and deforestation.

Smart sensor formwork system uses high-performance multifunction
sensors to both boost quality control and lower environmental impact.

System features

High-function mold with embedded multi-function sensor

  • Records concrete surface temperature and ambient temperature
  • Records times of concrete casting and demolding

Proprietary reader scans in data

  • Collects data wirelessly from a remote location
  • Automatically computes strength based on data collected
  • Determines surface temperature and strength of concrete on site

More durable, controllable, easy to install than plywood forms

  • Recording number of uses automatically
  • Recording form installed attitudes
  • Calculating CO2 reductions automatically
Concrete direct contact measurement system
Reading in data from the smart sensor

Usage example

Compatible with both metal and resin formwork

  • Building
    Building
  • Viaduct
    Viaduct
  • Tunnel (centering)
    Tunnel (centering)
  • Revetment
    Revetment

Estimating and color-mapping strength of concrete surface

Accurate concrete surface temperature measurements and curing time measurements now free concrete quality control from its past reliance on experience, and particularly such temperature management allows accurate decisions on demolding time. This approach helps to improve the long-term durability of concrete structures. Switching to plastic or metal forms with higher durability than plywood forms, contributes to more effective utilization of resources and energy saving.

Temperature records allow for improved strength control of structural concrete

Estimating strength

Strong presumption
Mold arrangement case of the operation

The cumulative temperature and temperature adjusted age* derived from the concrete surface temperature data permit the tracking, on site and in real time, of the strength development of concrete, etc. Plotting this strength data on the form layout drawing (Figure below) then provides a visual display of the concrete surface strength distribution. The result is immediate assessment of locations lacking strength or those that have reached the necessary strength. The data can be unified by a third-party organization for the issue of certificates of quality control.
ReferenceFCEB-FIP Model Code 1990

Distribution map showing estimated concrete surface strength by color

A word of the developper

Takafumi Noguchi
Department of Architecture, Graduate School of Engineering,
the University of Tokyo

Professor
Takafumi Noguchi
It was in the winter of 2010 that I started a project for advancing concrete quality control by focusing on forms with Kodama, a building materials trading company. The next summer, System Development Corporation joined. Development proceeded rapidly, allowing us to complete the first smart sensor form system in just one year. This was a result of the participants'enthusiasm. Their nimbleness also helped. To restore confidence in concrete structures and make construction over into an appealing industry, concrete work must secure transparency and adopt production systems that are both efficient and lean. I firmly believe that smart sensor form systems will constitute a major advance toward such goals. They also take into consideration resource recycling when used in combination with plastic or metal forms, which can be reused any number of times and are recyclable. These advantages should make them the new standard for forms.

A word of recommender

Toyoaki Miyagawa
Department of Civil Engineering,
Graduate School of Engineering, Kyoto University

Professor
Toyoaki Miyagawa
LSI technology as exemplified in IC and IC tags has been innovating over the past few years, and a more recent technological advance has been improved shock resistance for tablet computers. In the construction industry, quality control of concrete has been established by specimens for along time, but recently the quality control with higher performance has been strongly desired to meet specific purposes of concrete structures The proposed smart sensor form system, which enables higher-level and more sophisticated concrete quality control by incorporating the latest electronic technology into such generalpurpose parts as forms, suggests a new direction for concrete quality control and should be well received. I ardently hope that this project continues to add greater performance and wider functionality to smart sensor form systems, so that we can leave higher-quality concrete structures to succeeding generations.
the Ministry of Land, Infrastructure, Transport and Tourism NETIS -- registeredRegistration number QS-110040-VE