A method for monitoring deformation and stress of cement-based materials during steam curing

Abstract

The invention relates to a device and method for monitoring the deformation and stress of cement-based materials during the steam curing process, belonging to the technical field of civil engineering material testing; including a water bath temperature control heating system, a steel ring restraint system, a swelling deformation testing system and a stress testing system; The water bath temperature control heating system is composed of a rectangular double-layer insulation box and a water temperature control system; the swelling and deformation testing system is composed of a laser displacement sensor and a displacement data acquisition instrument, and the laser displacement sensor is fixed on the bracket and directly above the specimen; The internal stress testing system is composed of a strain gauge and a strain data acquisition instrument. The strain gauge is pasted on the outer middle of the steel ring, and the strain gauge is connected to the strain acquisition system; The steel ring constrains the expanded steam-cured cement-based material. The internal stress of the concrete during the steam-curing process is calculated by testing the strain of the steel ring, and the vertical strain is obtained by testing the change of the vertical displacement.

Description

technical field [0001] The invention relates to a device and method for monitoring the deformation and stress of cement-based materials during steam curing, and belongs to the technical field of civil engineering material testing. Background technique [0002] Prefabricated components produced by steam curing technology have been widely used in my country's railway, construction and other industries. The steam curing process is usually divided into four stages, namely, static stop stage, heating stage, constant temperature stage and cooling stage, which has the characteristics of accelerating mold turnover efficiency, improving production efficiency and good economy. At present, the static stop stage is usually set to 3h in the steam culture system adopted. The freshly mixed concrete is still in a plastic state after a 3-hour static stop period, the concrete structure has not been fully established, and the structural strength is very low. Therefore, as the concrete in the...

AI Technical Summary

Problems solved by technology

However, the annular shrinkage test in the standard uses a steel inner ring to limit the shrinkage of concrete. This standard method is not applicable to cement-based materials that produce volume expansion (such as cement-based materials that will produce volume expansion during the steam curing heating stage).

Images