Measuring device and method for unconfined bearing capacity of freshly mixed mortar

Abstract

The invention relates to a measurement device for fresh mortar non-lateral-confinement bearing capacity. The measurement device comprises a frame body, a loading device and a vertical displacement measurement device which are arranged from bottom to top respectively, wherein the frame body comprises a base, as well as a screw rod and a plurality of nuts for mounting the loading device and the vertical displacement measurement device, the loading device comprises a loading barrel, a loading plate is arranged on the bottom surface of the loading barrel, a loading barrel upper cover is arranged at the top of the loading barrel, a test sample is arranged between the loading plate and the base, and the vertical displacement measurement device comprises a screw rod fixing cross beam, a dial gauge mounting beam and a dial gauge. The device can be used for utilizing the dead load of liquid to load, and can load continuously and eliminate load unevenness, and the measurement device is simple in structure and convenient in use, and can easily measure the bearing capacity and displacement change of fresh mortar in a corresponding loading direction.

Description

Technical field [0001] The invention belongs to the field of building materials performance testing devices, in particular to a device for measuring the unconfined bearing capacity of freshly mixed mortar slurry, and also to a corresponding measuring method. Background technique [0002] The bearing performance of freshly mixed mortar before curing is generally not concerned. However, with the refinement of the research on the characteristics of mortar, and the specialization of mortar application fields. For example, 3D printing mortar, because there is no template, the requirements for the workability of the mortar are no longer limited to fluidity, consistency, and setting time. The bearing capacity of the fresh mortar and the change in bearing capacity with hydration time also become a characterization of the printing performance of the mortar. Important characteristics, the unconfined bearing capacity of freshly mixed mortar began to be studied. [0003] At present, there is...

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Problems solved by technology

[0004] 1. The shape of the freshly mixed mortar is unstable, and a slight disturbance will also cause a change in shape, so it is not suitable to use the method of lifting the sample platform, and the method of lowering the loading device can reduce the disturbance;

[0005] 2. The surface of the freshly mixed mortar sample is not smooth enough, and the contact area between the loading plate and the sample is not fixed. After the sample is in place, the position adjustment of the loading device and the experimental process need to observe the contact between the loading plate and the sample at any time;

[0006] 3. The bearing capacity of freshly mixed mortar is small, but the deformation is large

Second, there is a large difference in the order of magnitude of the unconfined carrying capacity of the two

[0009] 1. It is impossible to measure the vertical deformation of the mortar after compression;

[0010] 2. When the weight is placed, it may be eccentric, causing uneven force on the mortar sample;

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