Effective material age estimation device, compressive strength estimation device, and program

Patent metadata

Field	Value
Publication number	US-2023258621-A1
Application number	US-202018003693-A
Country	US
Kind code	A1
Filing date	Oct 23, 2020
Priority date	Jun 30, 2020
Publication date	Aug 17, 2023
Grant date	—

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 γ T dependent on the temperature of cast concrete, a humidity term calculation unit 14 for calculating a humidity term γ 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 γ T , the humidity term, and a step time term Δt i . The humidity term γ RH is introduced, and the sum of the products is weighted using the term.

First claim

1 . A device for estimating an effective age of a material, comprising:
a temperature term calculation unit for calculating a temperature term dependent on a temperature of a cast concrete; a humidity term calculation unit for calculating a humidity term dependent on a relative humidity of the cast concrete; and an effective material age calculation unit for calculating an effective material age of the cast concrete by multiplying the temperature term, the humidity term, and a step time term.

2 . The device of claim 1 , further comprising a temperature/humidity sensor for measuring the temperature of the cast concrete and the relative humidity of the cast concrete.

3 . The device of claim 1 , further comprising a cast concrete detection sensor for detecting a present or absence of the cast concrete.

4 . The device of claim 1 , wherein:
a predetermined threshold of the relative humidity is set up to be less than 100% and greater than 0%; the humidity term reaches a positive maximum when the relative humidity is 100%; the humidity term decreases within a first range wherein the relative humidity is less than 100% and not less than the predetermined threshold; and the humidity term approaches asymptotically to 0% within a second range wherein the relative humidity is less than the predetermined threshold.

5 . The device of claim 4 , wherein the humidity term is set up to be zero within the second range.

6 . The device of claim 4 , wherein the predetermined threshold is set up to be a relative humidity from 80% to 95%.

7 . The device of claim 1 , wherein the effective material age calculation unit omits to sum the products of the temperature term, the humidity term, and the step time term when the relative humidity is less than the predetermined threshold.

8 . The device of claim 1 , wherein:
the temperature term dependent on the temperature of T° C. is calculated in accordance with (Formula 1):

γ
T

=

exp
⁡
(

1
⁢

3
.
6

⁢
5

-

4
⁢
0
⁢
0
⁢
0

2
⁢
7
⁢
3

+
T

)

;

the humidity term γ RH dependent on the relative humidity of RH % is calculated in accordance with (Formula 2):
γ RH =exp{−0.8484(100− RH )}

; and
the effective material age dependent on the step time term is calculated in accordance with (Formula 3):

t
e

=

∑
i

Δ
⁢

t
i

·

γ
T

·

γ

R
⁢
H

.

9 . A device for estimating a compressive strength, comprising:
the device of claim 1 for estimating the effective material age; a compressive strength calculation unit operable to calculate a compressive strength of the cast concrete based on the effective material age calculated by the effective material age calculation unit of the effective material age estimation device defined in claim 1 .

10 . The device of claim 9 , wherein:
the compressive strength is calculated in accordance with at least one of the following Formula 4 and Formula 5; Formula 4 dependent on the constant, the setting time, and the nominal strength of the cast concrete is:

f

C
⁢
t

=

exp
⁢

{

s
·

(

1
-

2
⁢
8

t
e

-

t
s

)

}

·

f

c
⁢
2
⁢
8

;

and
Formula 5 dependent on the constants of “a” and “b” is:
f Ct ={t e /( a+bt e )}· f c28

11 . A program for making a computer work as a device, wherein the device comprising:
a temperature term calculation unit for calculating a temperature term dependent on a temperature of a cast concrete; a humidity term calculation unit for calculating a humidity term dependent on a relative humidity of the cast concrete; and an effective material age calculation unit operable to sum a product of the temperature term, the humidity term, and a step time term to calculate an effective material age of the cast concrete.

12 . The program of claim 11 , wherein the device further comprising a compressive str

Assignees

• Univ Tokyo
• Just Will Co Ltd
• Beeinventor Ltd
• E Fuji Company Ltd

Inventors

• Noguchi Takafumi
• Sun Bochao
• Hayasaki Masahiro
• Nishijima Shigeyuki
• Yamamoto Hideyuki

Classifications

• G01N33/383 Primary

  Concrete or cement · CPC title

• G01N33/38 Primary

  Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass · CPC title