Method and device for measuring concrete or mortar volume deformation

Abstract

The invention discloses a method and a device for measuring concrete or mortar volume deformation. The method comprises the following steps: pouring a mixture mixed by concrete or mortar into an open mold testing box according to engineering needs; wholly putting the open mold testing box filled with the concrete or mortar mixture into a heat insulation bottle; sealing the bottle opening of the heat insulation bottle by using a sealing cover provided with a graduated tube, a gas-guide tube and a thermometer; pouring liquid which is not dissolved with water into the heat insulation bottle through the graduated tube, so that the mold testing box is totally immersed by the liquid and the liquid is full of an inner cavity of the heat insulation bottle; and putting the whole heat insulation bottle into a constant temperature water area, so that the volume expansion or shrinkage deformation conditions of the concrete or mortar under heat insulation conditions can be accurately measured through the liquid level position conditions in the graduated tube. The method has the advantages of high measurement accuracy, simple structure, convenience in operation and the like.

Description

technical field [0001] The invention relates to a method and a device for measuring volume deformation of concrete or mortar, and belongs to the technical field of concrete deformation measurement. Background technique [0002] At present, with the rapid development of domestic economic construction, a large number of civil engineering projects have sprung up, and high-strength high-performance concrete and self-compacting concrete have been widely used. At the same time, the construction unit encountered many early cracking problems in concrete. For example, when the basement shear wall concrete was poured and the formwork was removed, regular penetrating cracks appeared. This phenomenon is especially obvious in high-strength concrete and self-compacting concrete. According to the shrinkage test in the current national standard "Standards for Test Methods of Long-term Performance and Durability of Ordinary Concrete" GBT 50082-2009, the long-term shrinkage method is to place...

AI Technical Summary

Problems solved by technology

Although this method can reflect the volume change of concrete more comprehensively, because the tested concrete is packed in a sealed sample bag, the water temperature change of the concrete and the corresponding change of its volume cannot be measured, and This measurement method reflects the volume change of the concrete through the change of the volume of the sample bag, because the sample bag and concrete are two different materials, and their volume changes are different at the same temperature. The difference in volume change will directly affect the measurement accuracy, and the volume of concrete will be constrained by the sample bag when it changes, and this constraint will affect the natural change of concrete; and after the concrete is loaded into the sample bag, it will When sealing the sample bag, it is difficult to ensure that there is no certain space between the concrete and the inner cavity of the sample bag, and the existence of this space will also affect the measurement accuracy

Therefore, this method not only has the problem of troublesome operation, but also its measurement accuracy is not ideal.

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