A curing device suitable for testing the alkali activity of aggregates using the rapid mortar bar method.

Abstract

This utility model discloses a curing device suitable for testing the alkali reactivity of aggregates using the rapid mortar bar method. It comprises three parts: a cylinder cover, a curing cylinder, and a specimen rack. The inner wall of the curing cylinder is equipped with multiple support blocks, arranged in upper and lower layers, to support the specimen rack. Multiple locking buckles are arranged around the curing cylinder and fixedly sealed to the cylinder cover. The inner wall of the curing cylinder has graduation lines to indicate the solution filling range. The specimen rack is divided into upper and lower layers and connected to the multiple support blocks respectively. Circular holes are evenly distributed on the specimen rack to ensure uniform solution flow. This utility model has a novel design and is suitable for detecting the potential hazards of expansion caused by the reaction between alkali and reactive aggregates in cement.

Description

Technical Field

[0001] This utility model relates to the technical field of highway engineering testing and inspection, and in particular to a curing device suitable for testing the alkali activity of aggregates using the rapid mortar bar method. Background Technology

[0002] The alkali-reactivity evaluation of aggregates is an important durability indicator for aggregates used in concrete and mortar. When concrete contains alkali-reactive aggregates, humid air causes them to absorb carbon dioxide, resulting in a chemical reaction that increases the alkali content within the concrete. On the one hand, this loosens the cement bond, causing concrete cracking; on the other hand, the alkaline reaction of the alkali-reactive aggregates and their reaction with cement leads to an increase in the volume of calcium silicate, reducing concrete strength and thus affecting concrete durability.

[0003] The "Specifications for Testing Aggregates in Highway Engineering" (JTG 3432-2024) specifies various methods for testing the alkali reactivity of aggregates. Among them, the rapid mortar bar method is used to determine whether the expansion caused by the reaction between alkali in cement and reactive aggregates poses a potential hazard, and is particularly suitable for testing aggregates with slow reactions or expansion that only occurs in the later stages. However, this method does not specify clear requirements for the curing cylinder used in the test. Therefore, this patent designs a curing device for testing the alkali reactivity of aggregates using the rapid mortar bar method. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the problems existing in the curing device applicable to the rapid mortar bar method for testing the alkali activity of aggregates, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide a curing device suitable for testing the alkali activity of aggregates using the rapid mortar bar method. Its design is novel and can be used to detect whether the expansion caused by the reaction between alkali and reactive aggregates in cement has potential hazards.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a curing device suitable for testing the alkali activity of aggregates using the rapid mortar bar method, comprising three parts: a cylinder cover, a curing cylinder, and a specimen rack; the inner wall of the curing cylinder is provided with multiple support blocks, divided into upper and lower layers, for supporting the specimen rack; multiple latches are provided around the curing cylinder and are fixedly sealed with the cylinder cover; the curing cylinder has graduation lines on its inner wall to indicate the solution filling range; the specimen rack is divided into upper and lower layers and is respectively connected to multiple support blocks, and the specimen rack has evenly distributed circular holes to ensure uniform solution flow.

[0008] As a preferred embodiment of the curing device for testing the alkali activity of aggregates using the rapid mortar bar method described in this utility model, the cylinder cover, curing cylinder, and specimen rack are made of corrosion-resistant and high-temperature-resistant polypropylene (80℃).

[0009] As a preferred embodiment of the curing device for testing the alkali activity of aggregates using the rapid mortar bar method described in this utility model, the curing cylinder has an inner diameter of 100mm and a height of 450mm.

[0010] As a preferred embodiment of the curing device for testing the alkali activity of aggregates using the rapid mortar bar method described in this utility model, the specimen rack is provided with an opening for connection with the support block, and the diameter of both the upper and lower layers of the specimen rack is 98mm.

[0011] As a preferred embodiment of the curing device for testing the alkali activity of aggregates using the rapid mortar bar method described in this utility model, the upper layer of the specimen rack is provided with a square stabilizing hole with a side length of 30mm, which is used to fix the specimen, ensuring that the specimens are placed vertically, do not contact each other, and do not contact the cylinder wall.

[0012] As a preferred embodiment of the curing device for testing the alkali activity of aggregates using the rapid mortar bar method described in this utility model, the lower layer of the specimen rack is provided with an equilateral triangular support hole with a side length of 20mm to support the specimen, ensuring that the specimen can be placed stably and does not touch the probe. During the test, the specimen can be quickly and stably placed on the specimen rack and the required solution can be added for curing.

[0013] The beneficial effects of this utility model are: This device has a novel design and can quickly and stably place three specimens on the specimen rack, add the required solution for curing, and then conduct performance testing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a front structural schematic diagram of a curing device suitable for testing the alkali activity of aggregates using the rapid mortar bar method, as per this patent.

[0015] Figure 2 This is a schematic diagram of the upper layer of a curing device for testing the alkali activity of aggregates using the rapid mortar bar method, as described in this patent.

[0016] Figure 3 This is a schematic diagram of the lower layer of a curing device for testing the alkali activity of aggregates using the rapid mortar bar method, as described in this patent. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0020] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0021] Reference Figures 1-3A curing device suitable for testing the alkali activity of aggregates using the rapid mortar bar method is provided, comprising three parts: a cylinder cover 1, a curing cylinder 2, and a specimen rack 3; the inner wall of the curing cylinder 2 is provided with multiple support blocks 4, divided into upper and lower layers, for supporting the specimen rack 3; multiple latches are provided around the curing cylinder 2 and are fixedly sealed with the cylinder cover 1; the inner wall of the curing cylinder 2 is provided with graduation lines to indicate the solution filling range; the specimen rack 3 is divided into upper and lower layers and is respectively connected to multiple support blocks, and the specimen rack 3 has evenly distributed circular holes to ensure uniform solution flow.

[0022] The cylinder cover 1, the curing cylinder 2, and the specimen holder 3 are made of corrosion-resistant and high-temperature-resistant polypropylene (80℃).

[0023] Furthermore, the curing cylinder 2 has an inner diameter of 100mm and a height of 450mm. Specifically, the specimen rack 3 has 3 openings for connection with the support block 4, and the diameter of the upper and lower layers of the specimen rack 3 is 98mm.

[0024] The upper layer of the specimen rack 3 has three square stabilizing holes 5 with a side length of 30mm, which are used to fix the specimens, ensuring that the specimens are placed vertically, do not contact each other, and do not contact the cylinder wall. The lower layer of the specimen rack 3 has three equilateral triangular support holes 6 with a side length of 20mm, which are used to support the specimens, ensuring that the specimens can be placed stably and do not touch the probe. During the test, the three specimens can be quickly and stably placed on the specimen rack 3 and the required solution can be added for curing.

[0025] During use: 1. In accordance with the requirements of the "Specifications for Testing Aggregates in Highway Engineering" (JTG 3432-2024), mold specimens of 25.4mm×25.4mm×285mm and perform standard curing for 24h±2h. 2. Place the lower specimen rack 3 on the lower support block 4 of the curing cylinder through the opening; 3. After the specimen is demolded, quickly place the specimen on the lower specimen rack 3, being careful not to touch the probe, and let the probe pass through the equilateral triangular support hole of the lower specimen rack 3; 4. Use the square stabilizing hole 5 of the upper specimen holder 3 to pass through the end of the specimen and stand the specimen vertically on the holder; 5. Quickly add the solution as specified in the specifications (tap water at 20℃±2℃ or sodium hydroxide solution at 80℃±2℃) to the mark; 6. The total volume of the three specimens is 184mL × 3 = 552mL. The distance from the graduation mark to the bottom of the curing cylinder is 350mm, and the inner diameter of the curing cylinder is 100mm. Therefore, the volume from the graduation mark to the bottom of the curing cylinder is 50 × 50 × π × 350 × 0.001 = 2748.89mL. When the solution is filled to the graduation mark, the solution volume is 2748.89 - 552 = 2196.89mL. At this point, the solution volume (2196.89mL) : specimen volume (552mL) = 3.98, which meets the requirement of a standard curing solution volume to specimen volume ratio of (4 ± 0.5): 1.

[0026] 7. After the solution is added, place the curing cylinder in a constant temperature chamber or constant temperature water bath to maintain the solution temperature at 80℃±2℃.

[0027] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A curing device suitable for use in rapid mortar bar method testing of aggregate alkali reactivity, characterized in that, It consists of three parts: a cap (1), a curing cylinder (2), and a specimen rack (3); the inner wall of the curing cylinder (2) is provided with multiple support blocks (4), which are divided into upper and lower layers to support the specimen rack (3); multiple buckles are provided around the curing cylinder (2) and are fixed and sealed with the cap (1); the curing cylinder (2) has scale lines on its inner wall to indicate the solution filling range; the specimen rack (3) is divided into upper and lower layers and is connected to multiple support blocks respectively; the specimen rack (3) has evenly distributed circular holes to ensure uniform flow of solution.

2. The curing device for testing the alkali activity of aggregates using the rapid mortar bar method according to claim 1, characterized in that: The cap (1), curing cylinder (2) and specimen rack (3) are made of corrosion-resistant and high-temperature resistant polypropylene (80℃).

3. The curing device for testing the alkali activity of aggregates using the rapid mortar bar method according to claim 2, characterized in that: The curing cylinder (2) has an inner diameter of 100 mm and a height of 450 mm.

4. The curing device for testing the alkali activity of aggregates using the rapid mortar bar method according to claim 3, characterized in that: The specimen rack (3) has 3 openings for connection with the support block (4), and the diameter of the upper and lower layers of the specimen rack (3) is 98mm.

5. The curing device for testing the alkali activity of aggregates using the rapid mortar bar method according to claim 1, characterized in that: The upper layer of the specimen rack (3) is provided with three square stabilizing holes (5), each with a side length of 30mm, for fixing the specimens to ensure that the specimens are placed vertically, do not contact each other, and do not contact the cylinder wall.

6. The curing device for testing the alkali activity of aggregates using the rapid mortar bar method according to claim 5, characterized in that: The lower layer of the specimen rack (3) is provided with three equilateral triangular support holes (6) with a side length of 20mm, which are used to support the specimens, ensure that the specimens can be placed stably and do not touch the probe. During the test, the three specimens can be quickly and stably placed on the specimen rack (3) and the required solution can be added for curing.

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