A road construction method utilizing high-ductility lightweight composite concrete

Abstract

This invention discloses a road construction method using high-ductility lightweight composite concrete, comprising the following steps: S1, bottom concrete construction; S2, concrete slab installation; S3, PVC pipe installation; S4, installation of A393 hot-dip galvanized steel wire mesh; S5, pouring of high-ductility lightweight composite concrete ECC. This invention provides a standardized construction method using high-ductility lightweight composite concrete ECC. Using this invention ensures the quality of the actual poured product. Furthermore, this invention utilizes precast concrete slabs to form a permanent lightweight concrete pouring mold, eliminating the need for large formwork / scaffolding, enabling simple and rapid construction, and reducing the use of heavy machinery.

Description

Specification 1 A Road Construction Method Utilizing High-Ductility Lightweight Composite Concrete Technical Field This invention relates to the field of building construction technology, specifically to a road construction method utilizing high-ductility lightweight composite concrete. Background Art The origin of lightweight cementitious materials can be traced back to the introduction of lightweight aggregates in the early 20th century. This material was widely used in the United States and Japan in the 1960s and 70s for road construction and backfilling projects, including embankments. With the introduction of pre-formed foam or expanded polystyrene (EPS) beads, this material was further developed. This material reduced density while maintaining sufficient strength. In the 1990s, the United States began to focus on adding pre-formed foam materials to lightweight concrete. The addition of pre-formed foam reduced the density of the material, improved its fluidity, and made it easier to backfill in complex terrain without compaction. At the same time, Japan also began to add EPS particles to lightweight concrete for backfilling projects, thus reducing the load on earthquake-prone areas. In recent years, my country has made great progress in foamed lightweight soil material technology, such as significantly improved foaming agent dilution ratio, foam stability, and material strength at the same density. Engineering cement-based composite material (ECC), also known as bendable concrete, is a new type of building material composed of cement, fine sand, admixtures, and short fibers (such as polyvinyl alcohol fibers). It possesses characteristics such as high ductility, controlled fine cracking, and self-healing ability, and is up to 40% lighter than conventional cement. Currently, there is a lack of standardized road construction methods utilizing high-ductility lightweight composite concrete (ECC). This invention addresses the shortcomings of existing technologies by providing a road construction method utilizing high-ductility lightweight composite concrete.To achieve the above objectives, the present invention adopts the following technical solution: A road construction method utilizing high-ductility lightweight composite concrete, comprising the following steps: S1. Bottom concrete construction: S1.1. First, complete the bottom foundation; S1.2. Conduct quality inspection on the bottom foundation to ensure it meets engineering requirements; S1.3. The surveyor marks the position of the curb line; S1.4. Erect wooden formwork along the curb line to form a mold for bottom concrete pouring, ensuring the wooden formwork is stably supported; S1.5. Pour concrete into the mold in layers: first pour a layer of concrete without fine aggregate, then pour a large concrete layer; S1.6. After the concrete has fully hardened, remove the wooden formwork, ensuring the curb is not damaged. If there are defects in the curb, they need to be repaired with mortar; S2. Concrete slab installation: S2.1. Check the concrete slab for damage and confirm that the dimensions are consistent with the drawings; S2.2. Conduct a trial lift to confirm stability and balance, then use a crane to slowly lift the concrete slab and, under the guidance of the supervisor, position it above the target installation point on the curb line; HK 30135841 A Instruction Manual 3 S2.3: Place the concrete slab vertically at the target installation point; S2.4: Support the concrete slab with supports to keep it upright; S2.5: Secure the concrete slab to the angle iron using stainless steel wire: pass the stainless steel wire through the pre-drilled holes in the concrete slab, then tightly wrap the wire around the angle iron to ensure a secure fixation; the angle iron is pre-fixed to the bottom large concrete layer or the non-aggregate concrete layer; S2.6: Use a level or laser level to check the verticality and alignment of the concrete slab; S2.7: Complete the installation of each concrete slab according to steps S2.1-2.6, and maintain consistent joint gaps between adjacent concrete slabs; S3: PVC pipe installation: S3.1: Pre-mark the pipe routing; S3.2: Cut the PVC pipe to the required length; S3.3: Drill holes in the large-volume concrete layer or the non-aggregate concrete layer according to the designed pipe routing, and install the PVC pipe in the drilled holes, using gaskets or brackets to maintain the position and slope of the PVC pipe; S4: Install A393 Hot-dip galvanized steel wire mesh: Lay a layer of A393 hot-dip galvanized steel wire mesh on top of the concrete layer without fine aggregate; S5, Pouring of high-ductility lightweight composite concrete ECC: S5.1, Confirm that all concrete slabs are firmly fixed and stable, forming a mold for lightweight concrete pouring; S5.2, Clean the inside of each concrete slab and remove debris; S5.3, Mark the final elevation of the high-ductility lightweight composite concrete ECC; HK 30135841 A Instruction Manual 4 S5.4, Use a concrete hopper or concrete pump to pour the high-ductility lightweight composite concrete ECC into the mold for lightweight concrete pouring.Further, in step S4, if multiple A393 hot-dip galvanized steel wire meshes are spliced ​​together as a layer, the individual A393 hot-dip galvanized steel wire meshes are tied together after laying. Further, in step S5.4, if multiple compartments are poured sequentially, after completing the pouring of one compartment, it is left to stand for 24-36 hours for preliminary hardening before continuing to pour the next compartment, until all compartments reach the specified height. Further, the concrete slab is made of high-ductility lightweight composite concrete (ECC). The beneficial effects of this invention are: 1. This invention provides a standardized construction method using high-ductility lightweight composite concrete (ECC), which can guarantee the quality of the actual poured product; 2. This invention utilizes prefabricated concrete slabs to form a permanent lightweight concrete pouring mold, eliminating the need for large formwork / scaffolding, allowing for simple and rapid construction, and reducing the use of heavy machinery. Figure 1 is a schematic diagram of the road concrete structure according to an embodiment of this invention. The following detailed description of the invention, in conjunction with the accompanying drawings, will further illustrate the present invention. It should be noted that this embodiment is based on the technical solution and provides detailed implementation methods and specific operating procedures, but the scope of protection of the present invention is not limited to this embodiment. HK 30135841 A Specification 5 This embodiment provides a road construction method using high-ductility lightweight composite concrete, including the following steps: S1, Bottom Concrete Construction: S1.1, First, complete the bottom foundation. S1.2, Conduct quality inspection on the bottom foundation to ensure it meets engineering requirements. S1.3, The surveyor marks the position of the curb line. S1.4, Erect wooden formwork along the curb line to form a mold for bottom concrete pouring, ensuring the wooden formwork is stably supported. S1.5, Pour concrete into the mold in layers: As shown in Figure 1, first pour a 100mm layer of concrete without fine aggregate, then pour a large concrete layer 200mm. S1.6, After the concrete has fully hardened, remove the wooden formwork, ensuring the curb is not damaged. If the curb has defects, it needs to be repaired with mortar. S2. Concrete Slab Installation: S2.1. Inspect the concrete slab for damage and confirm that its dimensions match the drawings. S2.2. Conduct a trial lift to confirm stability and balance. Then, slowly lift the concrete slab using a crane and, under the guidance of a supervisor, position it above the target installation point on the curb line. S2.3. Place the concrete slab vertically on the target installation point. S2.4. Support the concrete slab with supports to keep it upright. S2.5. Secure the concrete slab to the angle iron using stainless steel wire: Pass the stainless steel wire through the pre-drilled holes in the concrete slab, then tightly wrap the wire around the angle iron to ensure a secure fixation. The angle iron is pre-fixed to the bottom large concrete layer or non-aggregate concrete layer (HK 30135841 A Instruction Manual 6 layers).S2.6 Use a level or laser level to check the verticality and alignment of the concrete slabs. S2.7 Complete the installation of each concrete slab according to steps S2.1-2.6, ensuring consistent joint gaps between adjacent slabs. S3 PVC Pipe Installation: S3.1 Pre-mark the pipe routing; S3.2 Cut the PVC pipes to the required length. S3.3 Drill holes in the large-volume concrete layer or the non-aggregate concrete layer according to the designed pipe routing, and install the PVC pipes in the holes, securing them with gaskets or brackets to maintain their position and slope. S4 Install A393 hot-dip galvanized steel wire mesh: Lay a layer of A393 hot-dip galvanized steel wire mesh on top of the non-aggregate concrete layer. If multiple A393 hot-dip galvanized steel wire meshes are used, splice them together as one layer, and then tie them together after laying. S5. Pouring of High-Ductility Lightweight Composite Concrete ECC: S5.1. Confirm that all concrete slabs are firmly fixed and stable, forming the mold for lightweight concrete pouring. S5.2. Clean the inside of each concrete slab, removing debris. S5.3. Mark the final elevation of the high-ductility lightweight composite concrete ECC (preferably half the height of the concrete slab). S5.4. Use a concrete hopper or concrete pump to pour the high-ductility lightweight composite concrete ECC 300 into the mold for lightweight concrete pouring, as shown in Figure 1. If pouring is done in multiple compartments sequentially, allow each compartment to stand for 24-36 hours after pouring to allow for preliminary hardening, then continue pouring the next compartment until all compartments reach the specified height. In this embodiment, the concrete slabs are made of high-ductility lightweight composite concrete ECC. The road concrete structure obtained by pouring using the above method is shown in Figure 1. For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this invention.HK 30135841 A Claim 1 1. A road construction method using high-ductility lightweight composite concrete, characterized by comprising the following steps: S1. Bottom concrete construction: S1.1. First, complete the bottom foundation; S1.2. Conduct quality inspection on the bottom foundation to ensure that it meets the engineering requirements; S1.3. The surveyor marks the position of the curb line; S1.4. Erect wooden formwork along the curb line to form a mold for bottom concrete pouring, ensuring the wooden formwork is stably supported; S1.5. Pour concrete into the mold in layers: first pour a layer of concrete without fine aggregate, and then pour a large concrete layer; S1.6. After the concrete has fully hardened, remove the wooden formwork, ensuring that the curb is not damaged. If there are defects in the curb, they need to be repaired with mortar; S2. Concrete slab installation: S2.1. Check whether the concrete slab is damaged and confirm that the dimensions are consistent with the drawings; S2.2. Conduct a trial lift to confirm stability and balance, and then use a crane to slowly lift the concrete slab and position it above the target installation point on the curb line under the guidance of the supervisor; S2.3 Place the concrete slab vertically at the target installation point; S2.4 Support the concrete slab with supports to keep it upright; S2.5 Secure the concrete slab to the angle iron using stainless steel wire: pass the stainless steel wire through the pre-drilled holes in the concrete slab, then tightly wrap the stainless steel wire around the angle iron to ensure a secure fixation; the angle iron is pre-fixed to the bottom large concrete layer or the non-aggregate concrete layer (HK 30135841 A claim 2); S2.6 Check the verticality and alignment of the concrete slab using a level or laser level; S2.7 Complete the installation of each concrete slab according to steps S2.1-2.6, and keep the joint gaps between adjacent concrete slabs consistent; S3 PVC pipe installation: S3.1 Pre-mark the pipe route; S3.2 Cut the PVC pipe to the required length; S3.3 Drill holes in the large-volume concrete layer or the non-aggregate concrete layer according to the designed pipe route, and install the PVC pipe in the drilled holes, fixing it with gaskets or brackets to maintain the position and slope of the PVC pipe; S4. Install A393 hot-dip galvanized steel wire mesh: Lay a layer of A393 hot-dip galvanized steel wire mesh on top of the concrete layer without fine aggregate; S5. Pouring of high-ductility lightweight composite concrete (ECC): S5.1. Confirm that all concrete slabs are firmly fixed and stable, forming the mold for lightweight concrete pouring; S5.2. Clean the inside of each concrete slab, removing debris; S5.3. Mark the final elevation of the high-ductility lightweight composite concrete (ECC); S5.4. Use a concrete hopper or concrete pump to pour the high-ductility lightweight composite concrete (ECC) into the mold for lightweight concrete pouring.2. The method according to claim 1, characterized in that, in step S4, if multiple A393 hot-dip galvanized steel wire meshes are spliced ​​together as a layer, and after laying, each A393 hot-dip galvanized steel wire mesh is tied together. HK 30135841 A Claim 3 3. The method according to claim 1, characterized in that, in step S5.4, if multiple compartments are poured sequentially, after completing the pouring of one compartment, it is left to stand for 24-36 hours for preliminary hardening, and then the pouring of the next compartment continues until all compartments reach the specified height. 4. The method according to claim 1, characterized in that, the concrete slab is made of high-ductility lightweight composite concrete ECC. HK 30135841 A Specification Figure 1 Figure 1 HK 30135841 A.

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