Abstract: Provided is an effective material age estimation device capable of appropriately taking relative humidity variation into consideration when estimating an effective material age. This effective material age estimation device comprises a temperature term calculation unit 13 for calculating a temperature term ?T dependent on the temperature of cast concrete, a humidity term calculation unit 14 for calculating a humidity term ?RH dependent on the relative humidity of the concrete, and an effective material age calculation unit 15 for calculating the effective material age of the concrete by summing products of the temperature term ?T, the humidity term, and a step time term ?ti. The humidity term ?RH is introduced, and the sum of the products is weighted using the term.

Abstract: A recyclable formwork adds a new function without destroying other functions of the recyclable formwork. The recyclable formwork includes a main unit including a contact surface contacting with cast concrete, a non-contact surface parallel and opposite to the contact surface, and a plurality of ribs projecting from the non-contact surface and reinforcing the main unit. A case is housed between the plurality of ribs and fixed on the non-contact surface. A circuit is stored in the case. A highest point of the case at the side of the non-contact surface is not higher than a highest point of upper ends of the plurality of ribs.

Abstract: A recyclable formwork can suitably detect temperature of concrete cast contacting with the formwork in a field without spoiling the other functions of the formwork. The recyclable formwork is provided with: a main unit (1) including a plurality of ribs (3) and (4); a case (7) being housed between the ribs (3) and (4), the case (7) being fixed on a non-contact surface (1a); and a circuit housed in the case (7). A through-hole (16) is opened at a position corresponding to where the case (7) is fixed, the through-hole (16) penetrating the main unit (1) from the non-contact surface (1a) to a contact surface (2). A sensor-housing case (17) is provided with a lower portion of the case (7), the sensor-housing case (17) being inserted into the through-hole (16), a bottom face of the sensor-housing case (17) facing concrete. And, a concrete temperature-detecting sensor (19) for detecting surface temperature of the concrete is housed in the sensor-housing case (17).

Abstract: A recyclable formwork can suitably detect temperature of concrete cast contacting with the formwork in a field without spoiling the other functions of the formwork. The recyclable formwork is provided with: a main unit (1) including a plurality of ribs (3) and (4); a case (7) being housed between the ribs (3) and (4), the case (7) being fixed on a non-contact surface (1a); and a circuit housed in the case (7). A through-hole (16) is opened at a position corresponding to where the case (7) is fixed, the through-hole (16) penetrating the main unit (1) from the non-contact surface (1a) to a contact surface (2). A sensor-housing case (17) is provided with a lower portion of the case (7), the sensor-housing case (17) being inserted into the through-hole (16), a bottom face of the sensor-housing case (17) facing concrete. And, a concrete temperature-detecting sensor (19) for detecting surface temperature of the concrete is housed in the sensor-housing case (17).

Abstract: There is disclosed to provide a recyclable formwork that can add the new function without spoiling the other functions of the recyclable formwork. The recyclable formwork includes: a main unit including a contact surface contacting with cast concrete, a non-contact surface being parallel and opposite to the contact surface, and a plurality of ribs outstanding from the non-contact surface to a side opposite to the non-contact surface and reinforcing the main unit; a case being housed between the plurality of ribs and being fixed on a side of the non-contact surface; and a circuit being stored in the case. A first highest point of the case at the side of the non-contact surface is not higher than a second highest point of upper ends of the plurality of the ribs.