Dynamic test device and method for cement-based material deformation in thermal curing process

Abstract

The invention relates to a dynamic test device and method for cement-based material deformation in the thermal curing process, and belongs to the technical field of civil engineering material testing.The test device comprises a controllable water bath heating system, a design mold system, a deformation measurement system, an optimized data collection and analysis and processing program and the like. The test method comprises the steps that 1, the controllable water bath heating system is installed, and heating parameters are set; 2, the design mold system is installed, and to-be-tested cementis poured and vibrated in a mold; 3, the deformation measurement system is installed, a sensor is connected with the measurement system, and the sensor is calibrated; 4, data collection is conductedsimultaneously; 5, by means of the data analysis and processing program, the cement-based material deformation situation is analyzed in real time. Automatic collection and data analysis of deformationof cement-based materials under the early thermal curing condition are achieved, and the device and method can be suitable for parsing and presenting the cement-based material deformation rules in the thermal curing unsteady-state process.

Description

technical field [0001] The invention relates to a dynamic testing device and method for deformation of cement-based materials during thermal curing, and belongs to the technical field of civil engineering material testing. Background technique [0002] Under the background of my country's vigorous development of high-speed rail construction, the goal is to promote mold turnover and speed up construction progress, such as sleepers, track slabs, and prestressed simply supported box girders. The high-speed rail construction process has been greatly promoted by the high-quality and mass-scale production. However, despite the continuous improvement of the steam curing concrete mix design, the improvement of the selection of cementitious material compatibility, the continuous optimization of the steam curing system, and the addition of various high-performance admixtures, the fresh concrete after the steam curing process However, swelling and deformation still occurred, and therma...

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Problems solved by technology

[0003] At present, the research on the volume deformation of concrete mainly includes the drying shrinkage, self-shrinkage, chemical shrinkage of concrete at room temperature, and the first expansion and then shrinkage characteristics of concrete at a specific (high temperature) temperature, which are mainly realized by contact and non-contact methods. However, the objects of these studies are mainly the concrete after setting and hardening, and there are few special introductions to the testing devices and methods for the deformation characteristics of concrete during the steam curing process, that is, during the transition from normal temperature to high temperature.

A few scholars have studied the deformation characteristics of concrete during steam curing by setting up a magnetic support outside the steam curing box and lapping the dial gauge, but this cannot rule out the vibration and artificial readings caused by the AC relay switch of the steam curing box. At the same time, the rise of steam will also affect the reading of the dial gauge itself and may corrode the dial gauge. Therefore, the traditional contact test method to study the deformation characteristics of concrete during steam curing has obvious defects.

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