A probe for aggregate alkali-silica reactivity testing

Abstract

The utility model is suitable for building material test and detection field provides a kind of for aggregate alkali-silica reaction activity test measuring head, it include: metal measuring nail, be provided with metal plate on the metal measuring nail, the distance between the arc-shaped end of metal plate and metal measuring nail is H, the utility model can prevent cement paste and fine sand grain to flow into the gap of measuring nail and end plate small hole in mortar plug ramming forming process, avoid hardened cement paste to stick between measuring nail and end plate hole, cause measuring nail to pull out, fall off from mortar stick when form removal, improve mortar stick test piece forming efficiency, and reduce the workload of cleaning measuring head and test mould.

Description

Technical Field

[0001] This utility model relates to the field of building material testing and inspection, specifically a probe for testing the alkali-silica reactivity of aggregates. Background Technology

[0002] Alkali-aggregate reaction refers to the chemical reaction between the alkali-reactive components in aggregates and the alkali in concrete (including externally introduced alkali). The reaction products absorb water and expand, ultimately leading to phenomena such as concrete expansion and cracking. Whether aggregates possess alkali reactivity is an important factor affecting concrete durability. Alkali-aggregate reactions are divided into two categories: alkali-carbonic acid reaction and alkali-silica reaction. Currently, methods for determining the alkali-silica reaction activity of aggregates include the petrographic method, the mortar bar method (including the rapid method), and the concrete prism method. The mortar bar method (including the rapid method) is the most widely used test method. The main steps for specimen molding using the mortar bar method (including the rapid method) in the standard "Construction Sand" (GB / T 14684-2011) are as follows: Mix sand, cement, and water of the specified gradation in the specified proportions, stir evenly to make mortar, and fill the mortar into two layers into a mold equipped with a probe. Each layer is tamped 40 times. After tamping, scrape off the excess mortar with a trowel, smooth the surface, and number the specimens.

[0003] A standard triple mold for mortar rods can form 3 (1 set) mortar rod specimens. The specifications of a single specimen are 25mm×25mm×280mm. There is an end plate on each side of the mold, and a small hole is opened in the middle of the end plate. Before the specimen is formed, the test nail is inserted into the small hole. During the mortar tamping process, cement slurry and fine sand particles will inevitably flow into the gap between the test nail and the small hole. When the specimen is demolded and the end plate is removed after curing for 24 hours, the cement has hardened and adhered between the test nail and the small hole, which can easily cause the test nails embedded in the mortar rod to be pulled out or fall off, increasing the difficulty of demolding the specimen and affecting the test efficiency. Moreover, cleaning the hardened cement slurry in the test nail and the small hole of the end plate is time-consuming and laborious.

[0004] Therefore, in view of the above situation, there is an urgent need to provide a probe for the alkali-silica reactivity test of aggregates to overcome the shortcomings in current practical applications. Utility Model Content

[0005] The purpose of this invention is to provide a probe for testing the alkali-silica reactivity of aggregates. During the mortar tamping and molding process, it can prevent cement slurry and fine sand particles from flowing into the gap between the probe and the small hole of the end plate, and avoid hardened cement slurry sticking between the probe and the hole of the end plate, which would cause the probe to be pulled out or fall off from the mortar rod during demolding. This improves the molding efficiency of mortar rod specimens and reduces the workload of cleaning the probe and the mold.

[0006] This invention is implemented as follows: a probe for testing the alkali-silica reactivity of aggregates includes: a metal probe, on which a metal plate is disposed, and the distance between the metal plate and the arc-shaped end of the metal probe is H.

[0007] As a further aspect of this utility model, the diameter of the metal probe is 6mm.

[0008] As a further aspect of this utility model, the length of the metal probe is 25mm.

[0009] As a further embodiment of this utility model: both the metal probe and the metal plate are made of the same stainless metal.

[0010] As a further embodiment of this utility model, the metal plate has a square structure.

[0011] As a further embodiment of this utility model, the metal plate has a size of 25×25mm.

[0012] As a further aspect of this utility model, the thickness of the metal plate is 0.5mm.

[0013] As a further embodiment of this utility model, H is 5-10mm.

[0014] As a further aspect of this utility model, the metal plate and the metal probe are rigidly connected.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] The diameter and length of the metal probe in the probe head are the same as those of the standard probe. The probe head is fully compatible with the existing standard mortar rod mold and can be used directly on the standard mortar rod mold. The metal plate on the probe head mainly serves as a barrier, preventing cement slurry and fine sand particles from entering the gap between the metal probe and the small hole in the end plate during mortar tamping. This avoids the cement slurry hardening and causing the metal probe to stick to the small hole, reducing the difficulty of demolding the mortar rod specimen and reducing the workload of cleaning the mold and probe head. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a side view of the structure of this utility model.

[0020] Figure 3 This is a top view of the structure of this utility model.

[0021] In the attached diagram: 1-Metal probe, 2-Metal plate. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0026] Please see Figures 1-3 The present invention provides a probe for an alkali-silica reaction activity test of aggregate, comprising a metal probe 1 and a metal plate 2, wherein the metal probe 1 passes through the metal plate 2, and the metal plate 2 and the metal probe 1 are rigidly connected, and the distance between the arc-shaped ends of the metal plate 2 and the metal probe 1 is H, wherein H is 5-10mm;

[0027] The metal probe 1 has a diameter of 6mm and a length of 25mm;

[0028] Both the metal probe 1 and the metal plate 2 are made of the same stainless metal.

[0029] The metal plate 2 is a square plate with dimensions of 25×25mm and a thickness of 0.5mm;

[0030] In an embodiment of this utility model, the probe consists of two parts: a metal probe 1 and a metal plate 2. The specifications and dimensions of the metal probe 1 are the same as those of the existing standard probe, with a diameter of 6mm and a length of 25mm. A square metal plate 2 of 25mm×25mm is provided at a distance H from the arc-shaped end of the probe. The metal probe 1 passes through the metal plate 2, and there is a rigid connection between the metal probe 1 and the metal plate. The thickness of the metal plate is 0.5mm, and the size of H can be between 5mm and 10mm. The metal probe 1 and the metal plate 2 in this probe are made of the same stainless metal material, and 6 probes make up a set. The diameter and length of the metal probe 1 in the probe head are the same as those of the standard probe. The probe head is completely compatible with the existing standard mortar rod test mold and can be used directly on the standard mortar rod test mold. The metal plate 2 on the probe head mainly serves as a barrier, preventing cement slurry and fine sand particles from entering the gap between the metal probe 1 and the small hole of the end plate during mortar tamping. This avoids the cement slurry hardening and causing the metal probe 1 to stick to the small hole, reducing the difficulty of demolding the mortar rod test piece and reducing the workload of cleaning the test mold and probe head.

[0031] The objective of this utility model is achieved through the following measures:

[0032] Insert the metal probe 1 into the small hole in the end plate of the test mold, so that the metal plate 2 and the end plate of the test mold are in close contact. In this way, install the 6 probes into the standard triple test mold of the mortar rod that has been coated with release agent.

[0033] Prepare the mortar according to the relevant specifications, and pour the mortar into the test mold with the probe in two layers. Tamp each layer 40 times. After tamping, scrape off the excess mortar with a trowel, smooth the surface, and number it.

[0034] After the specimen is molded, it is immediately placed in the standard curing room with the mold on. After curing for (24±2) hours, it is demolded. After demolding, the flat end of the metal test nail 1 is embedded in the mortar rod, and the metal plate 2 will be tightly attached to the end of the mortar rod. After demolding, the specimen length is measured and cured in accordance with relevant specifications.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A probe for testing the alkali-silica reactivity of aggregates, comprising a metal probe nail 1, characterized in that, A metal plate 2 is provided on the metal probe 1, and the distance between the metal plate 2 and the arc-shaped end of the metal probe 1 is H.

2. The probe for testing the alkali-silica reactivity of aggregates according to claim 1, characterized in that, The diameter of the metal probe 1 is 6mm.

3. The probe for testing the alkali-silica reactivity of aggregates according to claim 2, characterized in that, The length of the metal probe 1 is 25mm.

4. The probe for testing the alkali-silica reactivity of aggregates according to claim 1, characterized in that, Both the metal probe 1 and the metal plate 2 are made of the same stainless metal.

5. The probe for testing the alkali-silica reactivity of aggregates according to claim 1, characterized in that, The metal plate 2 is a square metal plate.

6. The probe for testing the alkali-silica reactivity of aggregates according to claim 5, characterized in that, The metal plate 2 has a size of 25×25mm.

7. The probe for testing the alkali-silica reactivity of aggregates according to claim 6, characterized in that, The thickness of the metal plate 2 is 0.5 mm.

8. The probe for testing the alkali-silica reactivity of aggregates according to claim 1, characterized in that, The value of H is 5-10 mm.

9. The probe for testing the alkali-silica reactivity of aggregates according to claim 1, characterized in that, The metal plate 2 and the metal probe 1 are rigidly connected.

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