High-performance UHPC extrusion molding sound barrier stand column and preparation method thereof

Abstract

The invention belongs to the field of sound insulation materials, and particularly relates to a high-performance UHPC extrusion molding sound barrier stand column and a preparation method thereof.The high-performance UHPC extrusion molding sound barrier stand column comprises a stand column body prepared from cement, mineral powder, silica fume, fly ash microspheres, natural silica sand and / or quartz powder, plastic steel fibers, rubber powder, calcium hydroxide, calcium formate, sodium gluconate and an efficient water reducing agent; the stand column body is mixed through a planetary high-speed mixer and then extruded and formed through a vacuum high-pressure double-shaft extruder, and after forming, standing, high-temperature steam curing, steel bar planting and high-temperature and high-pressure steam curing treatment are conducted again. The sound barrier stand column has higher-strength compression resistance, fracture resistance, tensile resistance and impact resistance, can effectively bear external breaking pressure, and has the advantages of being long in service life and high in safety.

Description

Technical Field

[0001] The invention belongs to the field of sound insulation materials, and specifically relates to a high-performance UHPC extrusion-molded sound barrier column and a preparation method thereof. Background Art

[0002] With the rapid development of road traffic, the improvement of construction and the use of low-carbon, green and environmentally friendly new building materials advocated by the country, most of the H-shaped soil columns of sound barrier columns and traditional fences in the past use H-shaped steel and ordinary concrete columns. Most of the H-shaped steel columns need to be hot-dip galvanized and sprayed for rust prevention in the later stage. The process is complicated and will cause environmental pollution, which is not low-carbon and environmentally friendly. The existing sound barrier columns and fence columns are mostly cast with reinforced concrete, and some are UHPC ultra-high performance concrete columns. The production cost of conventional UHPC concrete columns is high, almost the same as the cost of steel columns. The weight of the column is 30% lighter than that of the traditional concrete column, but it is still relatively bulky, with poor installation convenience and high transportation cost. The casting molding process has many honeycomb surfaces, many pores, poor appearance, and needs to repair the surface in the later stage before spraying. It greatly increases the production cost and production cycle. The casting molding finishing effect is single and cannot achieve the "landscape" effect. The above defects are worth solving. Summary of the invention

[0003] The present invention aims to solve the above-mentioned technical problems and provide a high-performance UHPC extruded sound barrier column with higher strength in compression, flexure, tension and impact resistance.

[0004] The technical solution of the present invention is:

[0005] A high-performance UHPC extrusion-molded sound barrier column comprises a column body made of the following raw materials: cement, mineral powder, microsilica powder, fly ash microbeads, natural silica sand and / or quartz powder, plastic steel fiber, rubber powder, calcium hydroxide, calcium formate, sodium gluconate and high-efficiency water reducing agent; the column body is mixed by a planetary high-speed mixer, and then extruded by a vacuum high-pressure twin-shaft extruder. After molding, it undergoes static curing, high-temperature steam curing, reinforcement planting and high-temperature and high-pressure steam curing again.

[0006] Furthermore, the weight ratio of the components is cement: mineral powder: microsilica powder: fly ash microbeads: natural silica sand and / or quartz powder: plastic steel fiber: rubber powder: calcium hydroxide: calcium formate: sodium gluconate: high-efficiency water reducer = 1: (0.15-0.25): (0.05-0.1): (0.1-0.15): (1.5-2.0): (2.5-3.0): (0.02-0.05): (0.02-0.04): (0.01-0.03): (0.005-0.01): (0.01-0.02).

[0007] Preferably, the cement is 52.5 grade ordinary Portland cement.

[0008] Preferably, the mineral powder is S95 grade mineral powder.

[0009] Preferably, the microsilica powder is fully encrypted microsilica powder.

[0010] Preferably, the mesh size of the natural silica sand is 10-20 mesh, 40-60 mesh or 80-100 mesh; and the plastic-steel fiber is polypropylene coarse fiber.

[0011] Preferably, the high-efficiency water reducer is a polycarboxylic acid high-efficiency powder water reducer.

[0012] The method for preparing the high-performance UHPC extrusion-molded sound barrier column of the present invention comprises the following steps:

[0013] a) After weighing the raw materials according to the weight ratio, add them into a planetary high-speed mixer, add water and mix them at high speed;

[0014] b) cutting the mixed material into 5-15 cm cubic blocks through two kneading rows of kneading machines;

[0015] c) The material block is conveyed to the upper stage of the extruder through a belt and discharged into the lower stage of the extruder through screw downward pressure;

[0016] d) At the lower stage of the extruder, the material is extruded through a die under vacuum and high pressure to form a column body;

[0017] e) The formed column body is transported to the pallet for stacking via a conveyor belt, and then moved to a curing kiln for static curing and high-temperature steam curing;

[0018] f) After resting for 12-18 hours, the first stage of high temperature steam curing begins at 80°C for 8 hours;

[0019] g) After steaming, the boards are unloaded and packed by the stacker, and the reinforcing bar planting process is moved to the steel strand planting process, the steel strand is planted by the tensioning method, and the reinforcing bar planting holes are sealed with grouting material;

[0020] h) Finally, the column body is moved to an autoclave for high temperature and high pressure steam curing for 6 hours.

[0021] Furthermore, in step d), the mold adopts a double-row extrusion molding mold, which can extrude and mold two columns at the same time, and the longest extrusion production length can reach 5m; in step g), the grouting material is grouted by a spiral grouting machine process; in steps b) and c), the slump of the material after mixing and kneading is controlled at 10-15mm; in step e), a centrifuge is used instead of the traditional vibration method to facilitate the removal of bubbles, increase the density of the column body and the surface clear water concrete effect; in step d), the vacuum pressure is 0.8MPa and the extrusion pressure is 3.0MPa.

[0022] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] (1) The high-performance UHPC extrusion-molded (fence) sound barrier column of the present invention has higher strength in compression, flexural, tensile and impact resistance, and can effectively withstand external destructive pressure, so that the concrete column has a longer service life and high safety; the column is flat, smooth and has high color.

[0024] (2) The present invention does not require multiple sets of molds for casting and molding. One extrusion mold can produce 600 4-meter-long columns per day, which greatly shortens the production cycle of the columns. The weight is only one-third of that of traditional UHPC columns, which not only saves production costs but also greatly reduces transportation costs. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] A high-performance UHPC extrusion-molded sound barrier column comprises a column body made of the following raw materials: cement, mineral powder, microsilica powder, fly ash microbeads, natural silica sand, plastic steel fiber, rubber powder, calcium hydroxide, calcium formate, sodium gluconate and high-efficiency water reducer; the weight ratio of the components is cement: mineral powder: microsilica powder: fly ash microbeads: natural silica sand: plastic steel fiber: rubber powder: calcium hydroxide: calcium formate: sodium gluconate: high-efficiency water reducer = 1: 0.2: 0.08: 0.12: 1.8: 2.8: 0.03: 0.03: 0.02: 0.008: 0.01.

[0028] Among them, the cement is 52.5 grade ordinary Portland cement, the mineral powder is S95 grade mineral powder, the microsilica powder is fully encrypted microsilica powder, the mesh size of the natural silica sand is 80-100 mesh; the plastic steel fiber is polypropylene coarse fiber, and the high-efficiency water reducer is a polycarboxylic acid high-efficiency powder water reducer.

[0029] The method for preparing the high-performance UHPC extrusion-molded sound barrier column described in this embodiment comprises the following steps:

[0030] a) After weighing the raw materials according to the weight ratio, add them into a planetary high-speed mixer, add water and mix them at high speed;

[0031] b) cutting the mixed material into 5-15 cm cubic blocks through two kneading rows of kneading machines;

[0032] c) The material block is conveyed to the upper stage of the extruder through a belt and discharged into the lower stage of the extruder through screw downward pressure;

[0033] d) At the lower stage of the extruder, the material is extruded through a die under vacuum and high pressure to form a column body;

[0034] e) The formed column body is transported to the pallet for stacking via a conveyor belt, and then moved to a curing kiln for static curing and high-temperature steam curing;

[0035] f) After 16 hours of rest, the first stage of high temperature steam curing begins at 80°C for 8 hours;

[0036] g) After steaming, the boards are unloaded and packed by the stacker, and the reinforcing bar planting process is moved to the steel strand planting process, the steel strand is planted by the tensioning method, and the reinforcing bar planting holes are sealed with grouting material;

[0037] h) Finally, the column body is moved to an autoclave for high temperature and high pressure steam curing for 6 hours.

[0038] In step d) of this embodiment, the mold adopts a double-row extrusion molding mold, which can extrude and mold two columns at the same time, and the longest extrusion production length can reach 5m; in step g), the grouting material is grouted by a spiral grouting machine process; in steps b) and c), the slump of the material after mixing and kneading is controlled at 10-15mm; in step e), a centrifuge is used instead of the traditional vibration method to facilitate the removal of bubbles, increase the density of the column body and the surface clear water concrete effect; in step d), the vacuum pressure is 0.8MPa and the extrusion pressure is 3.0MPa.

[0039] Example 2

[0040] The only difference from Example 1 is that the weight ratio of the components is cement: mineral powder: microsilica powder: fly ash microbeads: natural silica sand: plastic steel fiber: rubber powder: calcium hydroxide: calcium formate: sodium gluconate: high-efficiency water reducer = 1:0.15:0.05:0.1:1.5:2.5:0.02:0.02:0.01:0.005:0.01.

[0041] Example 3

[0042] The only difference from Example 1 is that the weight ratio of the components is cement: mineral powder: microsilica powder: fly ash microbeads: natural silica sand: plastic steel fiber: rubber powder: calcium hydroxide: calcium formate: sodium gluconate: high-efficiency water reducer = 1: 0.25: 0.1: 0.15: 2.0: 3.0: 0.05: 0.04: 0.03: 0.01: 0.02.

[0043] In order to illustrate the technical effect of the present invention, the inventors set up the following comparative examples and comparative tests:

[0044] Comparative Example 1

[0045] The only difference from Example 1 is that the raw materials do not contain microsilica powder. Specifically as follows: A high-performance UHPC extrusion-molded sound barrier column includes a column body made of the following raw materials: cement, mineral powder, fly ash microbeads, natural silica sand, plastic steel fiber, rubber powder, calcium hydroxide, calcium formate, sodium gluconate and high-efficiency water reducer; the weight ratio of the components is cement: mineral powder: fly ash microbeads: natural silica sand: plastic steel fiber: rubber powder: calcium hydroxide: calcium formate: sodium gluconate: high-efficiency water reducer = 1: 0.2: 0.12: 1.8: 2.8: 0.03: 0.03: 0.02: 0.008: 0.01.

[0046] Comparative Example 2

[0047] The only difference from Example 1 is that the raw materials do not contain fly ash microbeads. Specifically as follows: A high-performance UHPC extrusion-molded sound barrier column includes a column body made of the following raw materials: cement, mineral powder, microsilica powder, natural silica sand, plastic steel fiber, rubber powder, calcium hydroxide, calcium formate, sodium gluconate and high-efficiency water reducer; the weight ratio of the components is cement: mineral powder: microsilica powder: natural silica sand: plastic steel fiber: rubber powder: calcium hydroxide: calcium formate: sodium gluconate: high-efficiency water reducer = 1: 0.2: 0.08: 1.8: 2.8: 0.03: 0.03: 0.02: 0.008: 0.01.

[0048] Comparative Example 3

[0049] The only difference from Example 1 is that the raw materials do not contain natural silica sand. Specifically: A high-performance UHPC extrusion-molded sound barrier column includes a column body made of the following raw materials: cement, mineral powder, microsilica powder, fly ash microbeads, plastic steel fiber, rubber powder, calcium hydroxide, calcium formate, sodium gluconate and high-efficiency water reducer; the weight ratio of the components is cement: mineral powder: microsilica powder: fly ash microbeads: plastic steel fiber: rubber powder: calcium hydroxide: calcium formate: sodium gluconate: high-efficiency water reducer = 1: 0.2: 0.08: 0.12: 2.8: 0.03: 0.03: 0.02: 0.008: 0.01.

[0050] Comparative Example 4

[0051] The only difference from Example 1 is that the raw materials do not contain rubber powder. Specifically: A high-performance UHPC extrusion-molded sound barrier column includes a column body made of the following raw materials: cement, mineral powder, microsilica powder, fly ash microbeads, natural silica sand, plastic steel fiber, calcium hydroxide, calcium formate, sodium gluconate and high-efficiency water reducer; the weight ratio of the components is cement: mineral powder: microsilica powder: fly ash microbeads: natural silica sand: plastic steel fiber: calcium hydroxide: calcium formate: sodium gluconate: high-efficiency water reducer = 1: 0.2: 0.08: 0.12: 1.8: 2.8: 0.03: 0.02: 0.008: 0.01.

[0052] Comparative Example 5

[0053] The only difference from Example 1 is that the raw materials do not contain plastic steel fiber. Specifically as follows: A high-performance UHPC extrusion-molded sound barrier column includes a column body made of the following raw materials: cement, mineral powder, microsilica powder, fly ash microbeads, natural silica sand, rubber powder, calcium hydroxide, calcium formate, sodium gluconate and high-efficiency water reducer; the weight ratio of the components is cement: mineral powder: microsilica powder: fly ash microbeads: natural silica sand: rubber powder: calcium hydroxide: calcium formate: sodium gluconate: high-efficiency water reducer = 1: 0.2: 0.08: 0.12: 1.8: 0.03: 0.03: 0.02: 0.008: 0.01.

[0054] The comparative data of various performance indicators of the sound barrier columns prepared in each embodiment and the sound barrier columns of the comparative example are shown in Table 1.

[0055] Table 1

[0056]

[0057]

[0058] in conclusion:

[0059] By comparing the various performance indicators (compressive strength, flexural strength, tensile strength) of the sound barrier columns prepared in Example 1, Example 2, Example 3 and Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, and Comparative Example 5, it can be clearly seen that:

[0060] The sound barrier columns of Example 1, Example 2 and Example 3 all show high performance in compressive strength, flexural strength and tensile strength, which is mainly due to the optimization of the raw material ratio, especially the reasonable combination of various high-performance materials such as cement, mineral powder, microsilica powder, fly ash beads, natural silica sand, plastic steel fiber, rubber powder, etc.

[0061] Comparative Example 1 does not contain microsilica powder, which results in a decrease in compressive strength, flexural strength and tensile strength, indicating that microsilica powder plays an important role in improving the overall mechanical properties of the sound barrier columns.

[0062] Comparative Example 2 does not contain fly ash microbeads, which also leads to a decrease in various performance indicators, indicating that fly ash microbeads are also indispensable for improving the mechanical properties of sound barrier columns.

[0063] Comparative Example 3 does not contain natural silica sand, and various performance indicators are significantly reduced, especially the flexural strength and tensile strength are more significantly reduced, indicating that natural silica sand has an important influence on the strength and toughness of the sound barrier columns.

[0064] Comparative Example 4 does not contain rubber powder. Although the compressive strength does not decrease much, the flexural strength and tensile strength decrease significantly, indicating that the rubber powder plays an important role in enhancing the toughness and flexural resistance of the sound barrier columns.

[0065] Comparative Example 5 does not contain plastic-steel fibers, resulting in a significant decrease in all performance indicators, especially the flexural strength and tensile strength, which are almost reduced to the minimum. This shows that plastic-steel fibers play a vital role in improving the overall mechanical properties and toughness of the sound barrier columns.

[0066] In summary, the high-performance UHPC extrusion-molded sound barrier column of the present invention significantly improves the compressive strength, flexural strength and tensile strength of the sound barrier column by optimizing the raw material ratio, especially including key components such as microsilica powder, fly ash beads, natural silica sand, plastic steel fiber and rubber powder, thereby making it have better mechanical properties and durability.

[0067] The above description is a detailed description of the preferred feasible embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modified changes completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A high-performance UHPC extrusion-molded sound barrier column, characterized by: It includes a column body made of the following raw materials: cement, mineral powder, microsilica powder, fly ash microbeads, natural silica sand and / or quartz powder, plastic steel fiber, rubber powder, calcium hydroxide, calcium formate, sodium gluconate and high-efficiency water reducing agent; the column body is mixed by a planetary high-speed mixer, and then extruded by a vacuum high-pressure twin-shaft extruder. After molding, it undergoes static curing, high-temperature steam curing, reinforcement planting and high-temperature and high-pressure steam curing again.

2. The high-performance UHPC extrusion-molded sound barrier column according to claim 1, characterized in that: The weight ratio of the components is cement: mineral powder: microsilica powder: fly ash microbeads: natural silica sand and / or quartz powder: plastic steel fiber: rubber powder: calcium hydroxide: calcium formate: sodium gluconate: high-efficiency water reducer = 1: (0.15-0.25): (0.05-0.1): (0.1-0.15): (1.5-2.0): (2.5-3.0): (0.02-0.05): (0.02-0.04): (0.01-0.03): (0.005-0.01): (0.01-0.02).

3. The high-performance UHPC extrusion-molded sound barrier column according to claim 1, characterized in that: The cement is 52.5 grade ordinary Portland cement.

4. The high-performance UHPC extrusion-molded sound barrier column according to claim 1, characterized in that: The mineral powder is S95 grade mineral powder.

5. The high-performance UHPC extrusion-molded sound barrier column according to claim 1, characterized in that: The microsilica powder is fully encrypted microsilica powder.

6. The high-performance UHPC extrusion-molded sound barrier column according to claim 1, characterized in that: The mesh number of the natural silica sand is 10-20 mesh, 40-60 mesh or 80-100 mesh; the plastic steel fiber is polypropylene coarse fiber.

7. The high-performance UHPC extrusion-molded sound barrier column according to claim 1, characterized in that: The high-efficiency water reducing agent is a polycarboxylic acid high-efficiency powder water reducing agent.

8. The method for preparing a high-performance UHPC extrusion-molded sound barrier column according to any one of claims 1 to 7, characterized in that: The steps include: a) After weighing the raw materials according to the weight ratio, add them into a planetary high-speed mixer, add water and mix them at high speed; b) cutting the mixed material into 5-15 cm cubic blocks through two kneading rows of a kneading machine; c) The material block is conveyed to the upper stage of the extruder through a belt and discharged into the lower stage of the extruder through screw downward pressure; d) At the lower stage of the extruder, the material is extruded through a die under vacuum and high pressure to form a column body; e) The formed column body is transported to the pallet for stacking via a conveyor belt, and then moved to a curing kiln for static curing and high-temperature steam curing; f) After resting for 12-18 hours, the first stage of high temperature steam curing begins at 80°C for 8 hours; g) After steaming, the boards are unloaded and packed by the stacker, and the reinforcing bar planting process is moved to the steel strand planting process, the steel strand is planted by the tensioning method, and the reinforcing bar planting holes are sealed with grouting material; h) Finally, the column body is moved to an autoclave for high temperature and high pressure steam curing for 6 hours.

9. The method for preparing a high-performance UHPC extrusion-molded sound barrier column according to claim 8, characterized in that: In step d), the mold adopts an extrusion molding double-row mold, which can extrude and mold two columns at the same time, and the longest extrusion production length can reach 5m; in step g), the grouting material is grouted by a spiral grouting machine process; in steps b) and c), the slump of the material after mixing and kneading is controlled at 10-15mm; in step e), a centrifuge is used instead of a traditional vibration method to facilitate the removal of bubbles, increase the density of the column body and the surface clear water concrete effect; in step d), the vacuum pressure is 0.8MPa and the extrusion pressure is 3.0MPa.

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