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Although the bird's nest is beautiful, how to ensure the quality of such large-volume concrete?
Release time: 2018-06-23

Beijing Olympics Bird's Nest, Water Cube, CCTV New Building, UAE Dubai Building, White House ...

Contemporary architecture is getting more and more miracles, and the scale is getting larger and larger, and the application of mass concrete construction technology is becoming more and more common.

For mass buildings, have you ever worried about the impact of mass concrete quality on the building? How to formulate a feasible mass concrete construction plan and take effective measures to ensure the quality of mass concrete during the construction process?

For large-volume concrete, the American PDI company listed a new instrument for measuring and analyzing the temperature of large-volume concrete during construction and monitoring the quality of large-volume concrete, the TEMP! TEMP (Thermal Evaluation of Mass Pours) system, on September 10, 2015. The requirements of a temperature control plan and the ability to monitor the age of concrete are simpler and cheaper than traditional methods.

Let's see how TEMP monitors the mass of concrete.

Why monitor mass concrete?

First, what is mass concrete?

China's "Construction Code for Mass Concrete" GB50496-2009 stipulates that large-volume concrete with a minimum geometric dimension of concrete structure entities of not less than 1m may be expected to cause harmful cracks due to temperature changes and shrinkage caused by hydration of cementitious materials in concrete The resulting concrete is called bulk concrete.

Modern buildings often involve the construction of large volumes of concrete, such as high-rise building foundations, large equipment foundations, and water conservancy dams. Concrete usually generates heat during hydration (curing). The main characteristics of large-volume concrete are large volume, small surface coefficient, concentrated heat release from hydration of cement, and rapid internal temperature rise, which can easily lead to adverse temperature effects. When the large temperature difference between inside and outside of large-volume concrete causes temperature cracks in the concrete, it will affect the structural safety and normal use. Therefore, it is necessary to implement a temperature control plan for large-volume concrete, including measuring the temperature of the concrete during curing at different locations. The measured temperature must be kept within the allowable range to ensure the quality of the construction.

TEMP

TEMP test system includes: host, hot cable, data acquisition instrument and TEMP-S analysis software. Utilizing the heat release characteristics of the cement hardening process, TEMP can measure the temperature of different parts of the large volume concrete to evaluate the quality of the concrete.

The TEMP test temperature uses a thermal cable (patented). A digital temperature sensor (user-defined interval, such as 30cm) is installed on the thermal cable. The number and distance of sensors can be set according to user requirements. The heating cable is usually tied to a steel cage or steel bar in advance, so that it can be installed inside the concrete. There are several sensors on each cable, and the specific number varies depending on the specific engineering structure. The cable ends extend out of the concrete and are connected to a data acquisition box.

The TEMP data acquisition box is responsible for recording and storing the measured temperature parameters during the test. The acquisition box has a built-in rechargeable battery that can be used continuously for 28 days on a single charge. The temperature sensor itself has no battery. If the battery of a data acquisition box is exhausted, we can replace it with a fully charged acquisition box in just a few seconds. So, in theory, we can test or monitor the concrete for any length of time.

Import the data of the collection box to the host of TEMP, you can quickly view the test results. If you import the data to the computer, you can use TEMP-S software to quickly and intuitively generate customized reports.

TEMP-S software can output the tested temperature-time data in the form of curves and tables, and can display the maximum and minimum temperature, maximum temperature difference, etc. TEMP-S can calculate the curing degree of concrete based on the measured temperature, and help users estimate the concrete strength (based on the determined strength-aging degree relationship) according to the standard ASTM C1074-11 "Standard Practice for Estimating Concrete Strength by the Maturity Standard Practice for Evaluating Concrete Strength by Aging.

TEMP instruments are distributed by Inspection Instruments, Inc (a wholly-owned subsidiary of PDI), and are exclusively sold in China by European and American land companies.

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