CN212964305U - Split type mortar test mold capable of being connected in inserting mode - Google Patents

Abstract

The utility model relates to a split type mortar test mold capable of being connected in an inserting way, which is used for manufacturing a mortar test piece and is characterized in that the split type mortar test mold comprises a lower mold and an upper mold, and the upper mold and the lower mold are connected in an inserting way; the lower die is a cube with an opening, and the upper die is a frame body with an upper opening and a lower opening; wherein, the length and the width of the inner surfaces of the upper die and the lower die are the same. The utility model discloses examination mould and method not only simple to use, convenient and high-efficient, safe and reliable to effectively solved because of the phenomenon that test piece preparation counter pressure intensity influences, played certain effect to the preparation that improves the test piece and the control of site operation quality.

Description

Split type mortar test mold capable of being connected in inserting mode

Technical Field

The utility model belongs to the building engineering field relates to a mortar test piece preparation for the compressive strength of experimental mortar, especially a split type mortar examination mould that can connect to peg graft.

Background

The compressive strength of the mortar is a key index for judging the on-site construction quality, and the quality of the manufactured test piece directly affects the detection result to a certain extent, for example, whether the size of the manufactured test piece meets the standard or not and whether the compactness of the whole test piece is consistent or not are judged, so that whether the strength detection data of the whole test piece is standard or not is ensured, and the like.

In the preparation process of a mortar test piece in DL/T5150-2017 "hydraulic concrete test procedure" currently used in the industry, a cube 21 with an upper opening is adopted in a test mold 2, and an outwardly extending edge 22 is arranged at the opening of the cube, as shown in fig. 7; the preparation process of the concrete mortar test piece comprises the following steps: after a thin layer of mineral oil is coated on the inner wall of the test mold 2, mortar is added from the opening and is higher than the opening of the test mold, the mortar in the test mold is inserted and tamped without stopping manual work in the process, and the mortar is added at any time when the mortar sinks to be lower than the opening of the test mold in the inserting and tamping process; waiting for 1-2h, after the surface moisture of the mortar at the opening of the test mold is slightly dry, leveling a scraper with the outer edge 22 of the test mold to scrape off the redundant mortar, and troweling the surface of the test piece; standing for 24-48 hours in an environment of 20 +/-5 degrees to solidify the mortar sample; and finally, removing the test mold to obtain a test piece.

In actual operation, the test piece obtained by adopting the test die 2 and the test piece manufacturing method has the following problems: firstly, a mortar sample is loaded into a test mould, thicker particles of the mortar can be precipitated downwards during production, more water can be generated at the upper part of the test mould, the overall density of the produced test piece is inconsistent, and the density of the upper part of the test piece is smaller than that of the lower part of the test piece, so that the overall strength of the test piece is lower, and the compression strength detection result of the mortar is finally influenced. Secondly, although mortar is always inserted and tamped in the manufacturing process, the deviation of different operators still occurs, so that the density uniformity of the manufactured test piece is poor, and the compressive strength of the test piece is also affected. Thirdly, in the manufacturing process of the test piece, the test piece needs to be manually and continuously inserted and tamped, and after 1-2 hours, the test piece needs to be manually scraped off again and the surface of the mortar is leveled, so that special personnel are needed and labor is consumed; in addition, in the actual manufacturing process, the operator forgets to trowel the mortar surface after 1-2 hours, so that the test piece fails to be manufactured.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model discloses change the thinking of preparation test piece completely, provide a new split type mortar examination mould that can insert the connection, it can dismantle through increasing a certain height and connect on the lower mould (the lower membrane is the same with original examination mould internal surface size), form the new examination mould that exceeds the requirement of test piece height size and bear the weight of mortar, make it avoid subsequent manual operation through the mode of mortar gravity self-settling, use manpower sparingly; meanwhile, the standard test piece with uniform density is obtained by removing the part with lower sand content on the upper part of the solidified pre-test piece, so that the consistency of the internal density of the standard test piece for the experiment is ensured, the actual compressive strength of the standard test piece can be reflected more truly, and the accuracy of the compressive strength detection of the mortar is ensured.

The utility model provides a split type mortar test mold capable of being connected in an inserting way, which is used for manufacturing a mortar test piece, and comprises a lower mold and an upper mold, wherein the upper mold and the lower mold are connected in an inserting way; the lower die is a cube with an opening, and the upper die is a frame body with an upper opening and a lower opening; wherein, the length and the width of the inner surfaces of the upper die and the lower die are the same; and an air pump hole is formed in the bottom of the lower die.

In some preferred embodiments, the outer wall of the lower die opening is recessed inwards to form a boss, and the inner side wall of the upper die lower opening is recessed inwards to form a socket; the plug socket of the upper die is buckled on the lug boss of the lower die to be mutually plugged so as to fixedly connect the upper die and the lower die.

In some preferred embodiments, the dimensions of the inner surface of the lower die are: the length is 70.7mm, the width is 70.7mm, and the height is 70.7 mm; the size of the inner surface of the upper die is as follows: the length is 70.7mm and the width is 70.7 mm. In some preferred embodiments, the upper die has a height of 20 to 70 mm. In a more preferred embodiment, the upper die has a height of 30-60 mm. Or in a more preferred embodiment the upper moulds have a height of 40-50 mm.

In some preferred embodiments, the wall thickness of both the upper and lower dies is 6 mm; the outer wall of the lower die opening is inwards sunken, the sunken depth of the inner side wall of the upper die lower opening is 3mm, and the sunken height is 15 mm.

Advantageous effects

The utility model discloses a split type mortar examination mould of connecing plug-in connection's technological effect lies in: the error can be reduced, the mortar test piece can be manufactured, and the test piece with uniform density can be manufactured, so that the compressive strength of the mortar at the reaction position can be more accurately reflected; moreover, the method for manufacturing the test piece saves labor and improves efficiency. The utility model discloses examination mould and method not only simple to use, convenient and high-efficient, safe and reliable to effectively solved because of the phenomenon that test piece preparation counter pressure intensity influences, played certain effect to the preparation that improves the test piece and the control of site operation quality.

Drawings

FIG. 1 is a schematic view of the exploded structure of the detachable mortar testing mold capable of being connected by plugging of the present invention;

FIG. 2 is a schematic view of the upper die;

FIG. 3 is a schematic cross-sectional view of an upper die;

FIG. 4 is a schematic view of the lower die;

FIG. 5 is a schematic cross-sectional view of a lower die;

FIG. 6 is a schematic cross-sectional view of a lower die of another construction;

fig. 7 is a schematic structural view of a conventional test mold.

Reference numerals:

the split type mortar test mold 1 capable of being connected in an inserting mode comprises an upper mold 12, an upper mold inner side wall 121, an upper mold inner side wall recess 122, a plug socket 123, a lower mold 11, a lower mold outer side wall 111, a lower mold outer side wall recess 112, a boss 113, an air pump hole 114, an existing test mold 2, a cube 21 and an edge 22.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

As shown in fig. 1-6, the utility model discloses a split type mortar examination mould 1 that can connect by inserting, including lower mould 11 and last mould 12, wherein, go up mould 12 and lower mould 11 and be detachable connection, specifically, the two is the plug-in type connection. A boss 113 formed by inward recessing of the outer side wall 111 of the opening of the lower die 11, and a socket 123 formed by inward recessing of the inner side wall 121 of the lower opening of the upper die 12; when the integral test mold 1 is required to be connected and formed, the socket 123 of the upper mold 12 is buckled on the boss 113 of the lower mold 11 and is mutually inserted, so that the upper mold 12 and the lower mold 11 are fixedly connected. When the connection is not required, the upper mold 12 is vertically pulled upward from the lower mold 11, and the upper mold 12 and the lower mold 11 are separated by separating the inserting portions of the upper mold and the lower mold. The upper die 12 and the lower die 11 are made of plastic or iron plate which is not easy to deform.

In a specific embodiment, the lower mold 11 is a cube having an opening with inner surface dimensions of 70.7mm in length, 70.7mm in width and 70.7mm in height. The upper die 12 is a frame body with an upper opening and a lower opening, and the length and the width of the inner surface of the upper die are the same as those of the inner surface of the lower die, that is, the size of the inner surface of the upper die is as follows: the length is 70.7mm and the width is 70.7 mm. The wall thickness of the upper die and the lower die is 4 mm; the depth of the inward recess 112 of the outer wall of the lower die opening and the depth of the inward recess 122 of the inner side wall of the upper die lower opening are both 2mm, and the height of the recesses 112 and 122 are both 15 mm. The setting of the height of the upper die 12 affects the strength of the finally formed test piece, and the setting is carried out by integrating the plugging height of the upper die and the lower die according to the sedimentation parameters of the test piece manufactured by the existing test die. In a specific embodiment, the height of the upper mold 12 is 20-70 mm. In a more preferred embodiment, the upper die has a height of 30-60 mm. Or in a more preferred embodiment the upper moulds are 40-50mm high.

In some embodiments, as shown in fig. 6, in order to more conveniently release the test piece from the lower mold, an air pump hole 114 is provided at the bottom of the lower mold 11. The air pump hole 114 penetrates the bottom wall of the lower mold 11. The air pump hole is used for being connected with an air pump, and pressure is added to a test piece in the lower die through the air pump and the air pump hole, so that the test piece is pushed out of the lower die by air pressure.

The method for manufacturing the mortar test piece by utilizing the split type mortar test mold capable of being connected in an inserting mode comprises the following steps:

(1) inserting the upper die on the lower die, namely buckling the socket of the upper die on the boss of the lower die to be inserted with each other so that the upper die and the lower die are fixedly connected to form an integral split type mortar testing die;

(2) collecting a sample of mortar;

(3) coating a thin layer of mineral oil on the inner surface of the integral split type mortar test mold;

(4) filling the mortar sample into the integral split type mortar test mold to enable the whole integral split type mortar test mold to be filled with the mortar sample;

(5) standing for 24-48 hours in an environment of 20 +/-5 degrees to solidify the mortar sample to form a pre-test piece;

(6) taking down the upper die from the lower die and the pre-test piece; the upper die is vertically pulled upwards from the lower die, the upper die plug socket is further vertically pulled upwards after being separated from the boss of the lower die until the upper die is completely separated from the lower die and the pre-test piece

(7) Horizontally cutting the pre-test piece along the opening of the lower die by using a cutting machine;

(8) and (4) demolding the residual test piece in the lower die to obtain a standard test piece with the size of 70.7mmX70.7mmX70.7mm for the test.

The utility model discloses in, when drawing of patterns to the test piece, invert the lower mould, strike the lower mould lateral wall gently, make the test piece slowly from the slippage in the lower mould.

In other embodiments, when the lower die is provided with the air pump hole, in the step (4), before the mortar sample is filled in the whole test die, a piece of paper is padded at the air pump hole, and then the mortar sample is filled in the air pump hole, so that the fixed substances in the mortar sample cannot be leaked out of the lower die, and the manufacture of a test piece is ensured; and in the step (8), when demoulding is carried out, the air pump is connected to the air pump hole, the air pressure is provided by the air pump to eject the residual test piece in the lower die out of the lower die, and demoulding is realized.

Example 1: the test piece to the preparation of current examination mould (figure 7) carries out the settlement test, confirms the utility model discloses the split type mortar examination mould that can connect by plugging's last mould height.

After a thin layer of mineral oil is coated in the test mold 2, mortar is added from the opening and is higher than the opening of the test mold, the mortar in the test mold is inserted and tamped without stopping manual work in the process, when the mortar sinks to be lower than the opening of the test mold in the inserting and tamping process, the mortar is added at any time until the mortar overflows out of the opening of the test mold and does not sink any more, a scraper is made to be flush with the outer edge 22 of the test mold to scrape off the redundant mortar, and the surface of a test piece is leveled; standing for 24-48 hours in an environment of 20 +/-5 degrees to solidify the mortar sample; and finally, removing the test mold to obtain a test piece. Three test pieces are made for each group, and the data is the average value of the three test pieces. And (3) curing the test pieces, measuring the height of each test piece by using a vernier caliper after curing is finished, and obtaining a settlement value as the difference value between the height and the height (namely 70.7mm) of the standard test piece.

The sedimentation values are given in table 1:

it can be obtained from the test that directly floating the surface of the test piece in the test mold without waiting for 1-2 hours results in unsatisfactory test piece size (mainly height), mainly because the test piece will settle. The settlement values of mortar test pieces with different proportions are different, wherein the maximum settlement value is 2.5mm, so that the height of the test piece in the lower die is required to be 2.5mm higher than that of the lower die at least when the height of the upper die is set. And setting the height of the upper die by the height of the upper die and the lower die which are connected and overlapped. The utility model discloses in, go up mould and lower mould and connect the height of connecing and be 15mm, consequently, go up the mould height and need be higher than 15mm plus 2.5 mm's height. Meanwhile, the height of the pre-test piece is determined by the height of the upper die, and the length of the cut test piece containing uneven density is also determined by the height of the upper die, so that the upper surface of the test piece left after cutting still has the condition of uneven density due to the fact that the height of the upper die is too small, and too much practical mortar sample can be obtained due to the fact that the height of the upper die is too large. Therefore, it is usually set to 20 to 70 mm. Preferably 50 mm.

Example 2: to current examination mould (figure 7) and the utility model discloses a test piece of the split type mortar examination mould (figure 1) preparation of connecing the plug-in connection carries out the intensity test respectively and verifies test piece compressive strength.

Four groups of test pieces with different mixing ratios are manufactured by the existing test die and the existing method for manufacturing the test pieces, and 6 test pieces are manufactured in each group.

Through the utility model discloses a but split type mortar examination mould of plug-in connection and the method that utilizes the split type mortar examination mould of plug-in connection preparation test piece make four groups of different batching of different ratio (the same with the ratio of current examination mould preparation test piece), and every group test piece preparation is 6.

Respectively carrying out compressive strength detection on the test pieces after the test pieces are maintained for 3 days (3 tests in each group) and 28 days (3 tests in each group), specifically, placing the test pieces right in the middle of a lower pressing plate of a testing machine, padding a steel base plate between the upper pressing plate and the lower pressing plate and the test pieces to align the centers of the test pieces and the pressing plate of the testing machine, starting the testing machine to uniformly press the test pieces; continuously and uniformly loading at the speed of 0.3-0.5 MPa/s, stopping adjusting the accelerator of the testing machine when the test piece begins to rapidly deform due to the approach of damage until the test piece is damaged, and recording the damage load.

The specific test piece strength test data are shown in table 2:

can find out by the upper table, the test piece of same ratio, the utility model discloses the intensity of the test piece of examination mould and method preparation is obviously higher than the intensity of current examination mould, consequently, the utility model discloses the actual compressive strength of mortar more can be reflected to the test piece of examination mould and method preparation.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims (5)

1. A split type mortar test mold capable of being connected in an inserting mode is used for manufacturing a mortar test piece and is characterized by comprising a lower mold and an upper mold, wherein the upper mold and the lower mold are connected in an inserting mode; the lower die is a cube with an opening, and the upper die is a frame body with an upper opening and a lower opening; wherein, the length and the width of the inner surfaces of the upper die and the lower die are the same; and an air pump hole is formed in the bottom of the lower die.

2. The split mortar test mold capable of being plugged and connected according to claim 1, wherein the outer wall of the opening of the lower mold is recessed inwards to form a boss, and the inner side wall of the opening of the upper mold is recessed inwards to form a plug socket; the plug socket of the upper die is buckled on the lug boss of the lower die to be mutually plugged so as to fixedly connect the upper die and the lower die.

3. The split mortar test mold capable of being plugged and connected according to claim 2, wherein the inner surface of the lower mold has the following dimensions: the length is 70.7mm, the width is 70.7mm, and the height is 70.7 mm; the size of the inner surface of the upper die is as follows: the length is 70.7mm and the width is 70.7 mm.

4. The split mortar test mold capable of being plugged and connected according to claim 3, wherein the height of the upper mold is 20-70 mm.

5. The split mortar test mold capable of being connected in an inserting manner according to claim 4, wherein the wall thickness of the upper mold and the wall thickness of the lower mold are both 6 mm; the outer wall of the lower die opening is inwards sunken, the sunken depth of the inner side wall of the upper die lower opening is 3mm, and the sunken height is 15 mm.

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