Construction method of integral UHPC roof waterproof system

Abstract

The invention relates to the technical field of ultra-high performance concrete roof waterproofing, in particular to a construction method of an integral UHPC roof waterproofing system, UHPC with a certain thickness is poured on a spraying type waterproof film to form a UHPC waterproof layer, and the UHPC waterproof layer and the spraying type waterproof film are integrally bonded; the mortar leveling layer and the UHPC waterproof layer are bonded through the spraying type waterproof film to form an integral structure, and meanwhile the spraying type waterproof film and the UHPC waterproof layer form a double-waterproof system. The method has the advantages that (1) the spraying type waterproof film is completely bonded with the mortar leveling layer at the bottom and the UHPC waterproof layer at the upper part; (2) the spraying type waterproof film and the UHPC form an integral waterproof system to realize integral waterproofing; (3) the UHPC compressive strength (greater than or equal to 100 MPa) and the tensile strength (greater than or equal to 5 MPa) are high, and the risk of damage to the waterproof layer is greatly reduced; and (4) the UHPC has ultra-high durability, can ensure permanent integral water resistance, really realizes no maintenance in the service life of a building, and greatly reduces the maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of ultra-high performance concrete roof waterproofing technology, and in particular to a construction method for an integrated UHPC roof waterproofing system. Background Technology

[0002] A roof typically consists of a leveling and slope-forming layer, an insulation layer, a waterproofing layer, and a protective layer or surface layer. Waterproofing systems are categorized into two types: a positive waterproofing system where the waterproofing layer is above the insulation layer, and an inverted waterproofing system where the waterproofing layer is below the insulation layer. Insulation layers often use sheet-like materials such as rock wool boards, EPS polystyrene boards, and XPS extruded polystyrene boards, while the waterproofing layer is generally made of various types of rolled materials.

[0003] Currently, in conventional waterproofing systems, the waterproofing layer and the roof panel cannot be bonded together as a whole, resulting in a gap between the waterproofing layer and the structural layer where the waterproofing layer is easily damaged. Once the waterproofing layer is damaged, the insulation layer is prone to failure, and there is a risk of leakage. After leakage occurs, the leakage point and leakage path cannot be determined, making repair difficult and causing the overall waterproofing and insulation functions of the roof to fail.

[0004] In an inverted waterproofing system, the protective layer or surface layer above the insulation layer is also prone to damage, which can lead to water ingress and failure of the insulation layer. At the same time, if the waterproofing layer is damaged, the leakage point and leakage path will be difficult to determine and repair, resulting in the failure of the overall waterproofing and insulation functions of the roof.

[0005] Both the upright and inverted waterproofing systems mentioned above have the following main problems: (1) The service life of the waterproof layer is relatively short; (2) The waterproof layer and the structural layer cannot form a whole, and there is a water seepage layer, which leads to leakage and is difficult to repair; (3) If the waterproof layer has a problem, the insulation layer will also be affected by water ingress and water accumulation, resulting in the failure of thermal insulation. (4) The overall waterproofing and heat insulation effects are poor; (5) The waterproof or protective layer is prone to aging, has a short service life, and has high subsequent maintenance costs. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by providing a construction method for an integrated UHPC roof waterproofing system. This method constructs a dual waterproofing system consisting of a waterproof membrane and a UHPC waterproof layer, using the waterproof membrane as an adhesive layer to improve the connection performance between the waterproof layer and the substrate, thereby achieving overall waterproofing.

[0007] The objective of this invention is achieved through the following technical solutions: A construction method for an integrated UHPC roof waterproofing system, characterized in that the construction method includes the following steps: Cement mortar is applied to the base layer of the roof to create a leveling layer. A certain thickness of spray-on waterproof membrane is sprayed onto the mortar leveling layer, and the spray-on waterproof membrane forms an integral bond with the mortar leveling layer. The spray-on waterproof membrane is then covered and cured. After the sprayed waterproof membrane is cured, a certain thickness of UHPC is poured on the waterproof membrane to form a UHPC waterproof layer, and the UHPC waterproof layer is integrally bonded to the sprayed waterproof membrane. The spray-applied waterproof membrane bonds the mortar leveling layer and the UHPC waterproof layer to form an integral structure, and the spray-applied waterproof membrane and the UHPC waterproof layer constitute a dual waterproof system.

[0008] The maximum aggregate particle size of the cement mortar shall not exceed 2.5 mm, and its flatness height difference shall not exceed 3 mm.

[0009] When the sprayed waterproof membrane is measured to have a Shore A hardness tester value of 50-60, the UHPC waterproof layer is poured.

[0010] The base layer includes a reinforced concrete roof slab, a slope-finding and leveling layer, and an insulation layer, wherein the slope-finding and leveling layer is disposed on the reinforced concrete roof slab, and the insulation layer is disposed on the slope-finding and leveling layer.

[0011] The thickness of the sprayed waterproof membrane is not less than 3mm.

[0012] Before applying the spray-on waterproof membrane, the surface of the mortar leveling layer is moistened.

[0013] The advantages of this invention are: (1) The sprayed waterproof membrane is completely bonded to the bottom mortar leveling layer and the upper UHPC waterproof layer; (2) The spray-applied waterproof membrane and UHPC form an integrated waterproof system to achieve overall waterproofing; (3) UHPC has high compressive strength (≥100MPa) and tensile strength (≥5MPa), which greatly reduces the risk of damage to the waterproof layer; (4) UHPC has extremely high durability and can guarantee permanent overall waterproofing, truly achieving maintenance-free operation during the building's service life, greatly reducing maintenance costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0015] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art: like Figure 1 As shown in the figure, the markings represent: 1. Reinforced concrete roof slab, 2. Slope leveling layer, 3. Thermal insulation layer, 4. Mortar leveling layer, 5. Sprayed waterproof membrane, and 6. UHPC waterproof layer.

[0016] Example: Figure 1 As shown, the construction method of the integrated UHPC roof waterproofing system in this embodiment involves a base layer consisting of a reinforced concrete roof panel 1, a slope-leveling layer 2, and an insulation layer 3. The reinforced concrete roof panel 1 serves as the bottom layer, and the slope-leveling layer 2 is installed on it to ensure that the insulation layer 3 meets the design requirements for slope, flatness, etc. The insulation layer 3 is installed on the slope-leveling layer 2.

[0017] This embodiment includes the following construction methods: (1) Following conventional construction methods, the slope leveling layer 2 and the insulation layer 3 are constructed sequentially on the reinforced concrete roof 1.

[0018] (2) Cement mortar with a maximum aggregate particle size not exceeding 2.5 mm is used for leveling. The height difference of the mortar leveling layer 4 does not exceed 3 mm to ensure its bonding performance with the sprayed waterproof membrane 5. The mortar leveling layer 4 set on the insulation layer 3 is used to provide a flat base for the sprayed waterproof membrane 5.

[0019] (3) Spray a 3mm thick spray-on waterproof membrane 5 (such as MASTERSEAL 345) onto the mortar leveling layer 4, and cure the membrane for 4-6 hours. The spray-on waterproof membrane 5 is applied by spraying and has its own adhesive properties, and one side of it is completely bonded to the mortar leveling layer 4.

[0020] (4) After the sprayed waterproof membrane 5 is cured, a 20-25mm thick UHPC is poured on the waterproof membrane to form a UHPC waterproof layer 6. The UHPC waterproof layer 6 is set on the other side of the sprayed waterproof membrane 5, and it also forms a complete bond with the sprayed waterproof membrane 5. At this time, the sprayed waterproof membrane 5 in this embodiment not only plays a waterproof role, but also plays a role in bonding the base layer and the UHPC waterproof layer 6, ensuring that the base layer-waterproof membrane-UHPC form a complete waterproof system. Under the dual action of the sprayed waterproof membrane 5 and the UHPC waterproof layer 6, structural waterproofing is achieved. The ultra-high strength and ultra-high durability of the UHPC waterproof layer 6 ensure that the waterproof system itself has a strong protective ability, greatly improving the service life of the waterproof system, and effectively protecting the underlying insulation layer from damage.

[0021] (5) After the UHPC waterproof layer 6 is poured, spray the membrane for curing immediately, and remove the curing membrane when the UHPC waterproof layer 6 is initially set for finishing and smoothing, and then cover the membrane for curing in time.

[0022] (6) After the UHPC waterproof layer 6 has set for 4-5 hours, water should be injected under the membrane for 7 days for curing.

[0023] In this embodiment, the bonding strength between the sprayed waterproof membrane 5 and the substrate and the UHPC waterproof layer 6 is ≥1.0MPa, and the spraying thickness is not less than 3mm, ensuring the overall bonding and waterproofing effect.

[0024] In this embodiment, to further improve the adhesion between the base layer (mortar leveling layer), the waterproof membrane, and the UHPC layer, the following measures can be taken: Before applying the sprayed waterproof membrane 5, remove the loose dust and particles from the surface of the mortar leveling layer 4, and wet the surface of the mortar leveling layer 4 (it is best to fully wet the surface and remove any standing water).

[0025] Before constructing the UHPC waterproof layer 6, to ensure that the sprayed waterproof membrane 5 is fully cured and suitable for subsequent UHPC pouring, a Shore A hardness tester is used for measurement. When the measured value is between 50 and 60, the UHPC waterproof layer 6 can be poured, and the adhesion between the membrane and the UHPC waterproof layer 6 is optimal.

[0026] Before pouring the UHPC waterproof layer 6, remove any surface dust from the sprayed waterproof membrane 5 and ensure that its surface is dry.

[0027] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A construction method for an integrated UHPC roof waterproofing system, characterized in that: The construction method includes the following steps: Cement mortar is applied to the base layer of the roof to create a leveling layer. A certain thickness of spray-on waterproof membrane is sprayed onto the mortar leveling layer, and the spray-on waterproof membrane forms an integral bond with the mortar leveling layer. The spray-on waterproof membrane is then covered and cured. After the sprayed waterproof membrane is cured, a UHPC of a certain thickness is poured on the sprayed waterproof membrane to form a UHPC waterproof layer, and the UHPC waterproof layer is integrally bonded to the sprayed waterproof membrane. The spray-applied waterproof membrane bonds the mortar leveling layer and the UHPC waterproof layer to form an integral structure, and the spray-applied waterproof membrane and the UHPC waterproof layer constitute a dual waterproof system.

2. The construction method of the integrated UHPC roof waterproofing system according to claim 1, characterized in that: The maximum aggregate particle size of the cement mortar shall not exceed 2.5 mm, and its flatness height difference shall not exceed 3 mm.

3. The construction method of the integrated UHPC roof waterproofing system according to claim 1, characterized in that: When the sprayed waterproof membrane is measured to have a Shore A hardness tester value of 50-60, the UHPC waterproof layer is poured.

4. The construction method of the integrated UHPC roof waterproofing system according to claim 1, characterized in that: The base layer includes a reinforced concrete roof slab, a slope-finding and leveling layer, and an insulation layer, wherein the slope-finding and leveling layer is disposed on the reinforced concrete roof slab, and the insulation layer is disposed on the slope-finding and leveling layer.

5. The construction method of the integrated UHPC roof waterproofing system according to claim 1, characterized in that: The thickness of the sprayed waterproof membrane is not less than 3mm.

6. The construction method of the integrated UHPC roof waterproofing system according to claim 1, characterized in that: Before applying the spray-on waterproof membrane, the surface of the mortar leveling layer is moistened.

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