Self-constriction test device for steel slag cement mortar

Abstract

The utility model provides a steel slag cement mortar self-constriction test mold, which relates to the technical field of cement-based material self-constriction detection, and comprises a base, a test container, a measuring mechanism, a leveling plate and a dial indicator, the measuring mechanism and the test container are positioned above the base, and the measuring mechanism comprises support rods at two ends, two sides and above a test piece; a measuring mechanism is arranged on the movable table, a dial indicator is arranged on the supporting rod in the transverse direction, leveling plates are connected to the lower portion of the movable table through connecting columns, and the leveling plates are arranged at the two ends, the two sides and the upper portion of the testing container. And when various shrinkage dimension elements of the cement-based test block are measured, the reliability of a measurement result can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to building material measuring equipment field, concretely relates to a steel slag cement mortar self shrinkage test device. BACKGROUND

[0002] Shrinkage and cracking of cement-based materials has been a major challenge faced by the construction industry. Since cement generates volume shrinkage during the chemical reaction process, shrinkage of cement products is inevitable. The increase of cement fineness and the use of super-fine mineral admixtures will increase the self-shrinkage and dry shrinkage of building materials such as concrete and mortar, and shrinkage usually leads to the generation of cracks. These cracks have a significant impact on the durability of the structure, because they allow the penetration of aggressive media in the environment into the interior of the structure, resulting in various erosion problems such as carbonation, thereby significantly reducing the durability of the structure.

[0003] The existing method for measuring the volume change of mortar test blocks can only test the change in one direction of the mortar, and the overall volume change of the entire mortar cannot be tested, which is not accurate for judging the overall volume stability of the mortar. And part of the device needs to be taken out after the test piece is solidified, and part of the mold cannot be disassembled, and the mortar is difficult to take off from the test equipment after solidification, which will generate a lot of subsequent work for demolding and cleaning in the later period, resulting in limitations in use. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of steel slag cement mortar self shrinkage test device, to overcome the above-mentioned existing method for measuring the volume change of mortar test block can only detect the deformation in single direction, and cannot comprehensively and accurately reflect the change state of the volume of entire test piece, there is limitation, and then lead to the inaccurate evaluation of the overall volume stability of mortar and the inconvenient experimental operation technical problem.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme,

[0006] A kind of steel slag cement mortar self shrinkage test device, including a test mold, four side walls and upper of test mold are provided with leveling plate, and the upper of leveling plate is fixed with micrometer.

[0007] The bottom of test mold is provided with buckle, and test mold is fixed in the recess on the base by buckle.

[0008] The bottom of test mold is provided with buckle, and test mold is fixed in the recess on the base by buckle.

[0009] Four side walls of test mold are provided with positioning hole, and leveling plate is fixed in positioning hole.

[0010] The leveling plate above the test mold is suspended above the test mold.

[0011] A crossbar is arranged above the test mold, and the upper end of the leveling plate above the test mold is fixed on the crossbar.

[0012] A support rod is arranged outside each of the four side walls of the test mold, and the support rod is vertically fixed on the upper surface of the base.

[0013] The support rod corresponds to the position of the leveling plate on the four side walls of the test mold, and the leveling plate is fixedly connected with the support rod through the thin rod.

[0014] The micrometer above the test mold is fixed on the crossbar, and the probe of the micrometer extends to the center position of the leveling plate at the lower end of the crossbar.

[0015] The micrometer above the test mold is fixed on the crossbar, and the probe of the micrometer extends to the center position of the leveling plate at the lower end of the crossbar.

[0016] Compared with the prior art, the device has the following beneficial effects:

[0017] The test mold is fixed in the groove of the base through buckles, so that the test mold is stable during testing, movement or inclination is prevented, and the accuracy of the test result is improved.

[0018] Further, the leveling plate is fixed in the positioning hole of the test mold, so that the position of the leveling plate is fixed accurately, and measurement error caused by positional deviation is avoided.

[0019] Further, the arrangement of the leveling plate above the test mold allows the mortar test block in the test mold to deform freely, reduces the influence of external factors on the measurement result, and improves the measurement accuracy.

[0020] Further, the arrangement of the crossbar above the test mold improves the stability of the leveling plate above the test mold, ensures that the leveling plate remains horizontal during testing, and improves the accuracy of the measurement.

[0021] Further, the support rods are arranged around the test mold, and the crossbar is horizontally arranged on the two support rods and fixed, thereby providing an additional support structure for the test mold, further ensuring the stability of the leveling plate and the micrometer, and reducing external interference.

[0022] Further, the position of the support rod corresponds to the position of the leveling plate, the leveling plate is fixedly connected with the support rod through the thin rod, the stability of the leveling plate is further improved, the leveling plate does not move during testing, and the measurement accuracy of the device is improved.

[0023] Further, the micrometer gauges above the test mold and outside the four walls are arranged, so that the probes of the micrometer gauges above the test mold and outside the four walls accurately contact the center positions of the leveling plates, and the measurement accuracy and consistency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 : the whole structure schematic view of the utility model;

[0025] Fig. 2 : the front view structure schematic view of the utility model;

[0026] Fig. 3 : the top view structure schematic view of the utility model;

[0027] Fig. 4 : the side view structure schematic view of the utility model.

[0028] Label explanation: 1, base; 2, micrometer gauge; 3, positioning hole; 4, support rod; 5, leveling plate; 6, test mold; 7, buckle; 8, crossbar. DETAILED DESCRIPTION

[0029] In order to further understand the content of the utility model, the utility model is described in detail below in combination with the drawings and specific embodiments. It should be understood that the embodiments are only explained and not limited.

[0030] The described embodiments are only part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0031] Referring to Figs. 1 to 4 The utility model provides a kind of steel slag cement mortar self-shrinkage test mold, comprising: base 1, micrometer gauge 2, support rod 4, base 1 is rectangular structure, support rod 4 is vertically fixed on the four edges of base 1, crossbar 8 is transversely fixed on the two support rods 4 of base 1 long side;Base 1 is equipped with the recess capable of accommodating mortar test piece and buckle 7, test mold 6 is placed in the recess on base 1, and is fixed with buckle 7;Four sides of test mold are provided with positioning hole 3, leveling plate 5 is fixed in the four positioning holes 3 of test mold 6;Micrometer gauge 2 is fixed at one end of thin rod, the other end of thin rod is fixed on support rod 4, the probe of micrometer gauge 2 is fixed at the center position of leveling plate 5 on the four sides of test mold 6 by support rod 4, test mold 6 is further provided with a leveling plate 5 above, the leveling plate 5 above test mold 6 is directly on the crossbar 8 above test mold 6, and the probe is directly fixed on the leveling plate.

[0032] The utility model provides a kind of mixed slag cement mortar self-shrinkage test device, the position of leveling plate 5 is directly adjusted suitable when test piece pouring, test piece and leveling plate 5 are poured into an organic whole, two thin rods on leveling plate 5 are removed after mortar hardening, when reaching required age, reading shrinkage value can complete test.In this test process, mortar test piece is not needed to be moved, it is easy to operate and high in accuracy, and early shrinkage and long-term shrinkage can be measured.The specific implementation steps of mixed slag cement mortar self-shrinkage test device are as follows:

[0033] Step one: prepare mortar raw materials, test mould 6 (size is 40mm×40mm×160mm), leveling plate 5, thin rod, dial gauge 2, support rod 4, crossbar 8 and base 1.

[0034] Step two: the temperature of pre-cultivation room is set to 20±5 DEG C;The temperature of standard cultivation room is set to 20±2 DEG C, and relative humidity is kept at 95% or more;The temperature of shrinkage room is set to 20±2 DEG C, and relative humidity is controlled at 60±5%.

[0035] Step three: base 1 is placed on a stable workbench, and the base 1 in the embodiment is a rectangular base, a layer of rubber pad is laid on the base 1 to reduce the influence of external vibration on the experiment.Support rod 4 is installed on the base 1, to ensure that it is perpendicular to the surface of the base, and two support rods 4 are fixed to the outer ends of the four edges of the base 1 by screws or welding;A crossbar 8 is installed on the two support rods 4 on the two long edges of the base 1, and the crossbar 8 is adjusted to an appropriate height, and then the connection between the crossbar 8 and the support rod 4 is fastened with screws;Dial gauge 2 is installed on the four support rods 4 and the crossbar 8 respectively, so that the probe of the dial gauge 2 can contact the center position of the leveling plate 5, the position of the leveling plate 5 is adjusted and fixed, and the four sides of the test mould 6 are provided with positioning holes 3, the diameter of the positioning holes 3 around the test mould 6 is 20mm, the leveling plate 5 is fixed in the positioning hole 3 on the test mould 6, and the leveling plate 5 is fixed on the support rod 4 by two thin rods.It should be noted that each leveling plate 5 is in a horizontal state.

[0036] Step four: mix cement, sand and other raw materials according to the standard ratio to make mortar;Pour the mixed mortar into the test mould 6 with leveling plate 5 placed in it, and adjust the position relationship between the leveling plate 5 and the mould to make them closely fit but not affect the flow of mortar;Use a vibration table or other methods to remove air bubbles and ensure that the mortar uniformly fills the entire mould space;Cure in the pre-cultivation room for about 24 hours until the mortar is preliminarily hardened.

[0037] Step five: when the mortar reaches a certain strength, the thin rod connecting the leveling plate 5 and the support rod 4 is removed carefully; the test mold 6 with the test piece is transferred to the curing chamber for curing to the specified time; after reaching the required age, the test device is transferred to the shrinkage chamber for formal measurement; the data displayed by the dial gauge 2 at this time is recorded as the initial reading; the above steps are repeated to record the data changes at different time points within a certain period of time.

[0038] Through the above steps, we can effectively use the mortar shrinkage test frame provided by the utility model to accurately determine the volume change of the mortar material under different conditions, thereby providing a scientific basis for the selection of building materials.

[0039] In the utility model, the entire test process can be completed directly in the test mold, and the test mold is detachable, so that cleaning the test mold after completing the test is more convenient.

[0040] Finally, the method of the utility model is only a preferred embodiment, and is not used to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

[0041] The above embodiments are only used to illustrate the technical solutions of the utility model and not to limit them. Although the utility model has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the specific embodiments of the utility model can still be modified or replaced equivalently without departing from the spirit and scope of the utility model. Any modification or equivalent replacement without departing from the spirit and scope of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A steel slag cement mortar self-shrinkage test device, characterized by, Including a test mold (6), four side walls and the top of test mold (6) are provided with leveling plate (5), the top of leveling plate (5) is fixed with micrometer (2).

2. The steel slag cement mortar self-shrinkage test device according to claim 1, characterized in that, The lower part of test mold (6) is provided with base (1), the upper surface of base (1) is provided with recess, test mold (6) is fixed in recess.

3. The steel slag cement mortar self-shrinkage test device according to claim 2, characterized in that, The bottom of test mold (6) is provided with buckle, test mold (6) is fixed in the recess on base (1) through buckle (7).

4. The steel slag cement mortar self-shrinkage test device according to claim 2, characterized in that, The four side walls of test mold (6) are provided with positioning hole (3), leveling plate (5) is fixed in positioning hole (3).

5. The steel slag cement mortar self-shrinkage test device according to claim 4, characterized in that, The upper part of test mold (6) is provided with one horizontal rod (8), the upper end of leveling plate (5) above test mold (6) is fixed on horizontal rod (8).

6. The steel slag cement mortar self-shrinkage test device according to claim 5, characterized in that, The outer side of four side walls of test mold (6) is provided with one support rod (4), support rod (4) is vertically fixed on the upper surface of base (1).

7. The steel slag cement mortar self-shrinkage test device according to claim 1, characterized in that, Support rod (4) corresponds to the position of leveling plate (5) on four side walls of test mold (6), leveling plate (5) is connected and fixed with support rod (4) through thin rod.

8. The self-shrinkage testing device for a steel slag cement mortar according to claim 7, characterized by, Micrometer (2) on the outer side of four side walls of test mold (6) is fixed on support rod (4), and the probe of micrometer (2) extends to the center position of leveling plate (5) through support rod (4) and is fixed.

9. The steel slag cement mortar self-shrinkage test device according to claim 8, characterized in that, Micrometer (2) above test mold (6) is fixed on horizontal rod (8), and the probe of micrometer (2) extends to the center position of leveling plate (5) at the lower end of horizontal rod (8) and is fixed.

10. The steel slag cement mortar self-shrinkage test device according to claim 9, characterized in that, ​

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