Design And Research On Mechanical Behavior Of Rock Wool Thermal Insulation Decorative Interated Board

With the wave of building energy efficiency sweeping the world,countries around the world are paying more and more attention to building energy efficiency,and external wall insulation is a key point in building energy efficiency.However,the most common ETICS has gradually exposed defects such as cracking,peeling of the insulation board and easy fire.The appearance of the integrated thermal insulation decoration board has solved the problem of the ETICS,but its fireproof behavior is poor.Based on the above background and engineering requirements,this thesis proposes an integrated thermal insulation decoration board using rock wool as the thermal insulation core material.The rock wool double-sided composite calcium silicate board forms a three-layer "sandwich board" structure,which ensures the bonding behavior of the integrated board while absorbing sound and fire.This thesis has carried out experimental research on the design and mechanical behaviors of rock wool thermal insulation decoration integrated board,including three aspects:rock wool thermal insulation decoration integrated board design and preparation,tensile bonding behavior and shear bonding behavior.The content is:(1)The choice of insulation core material and the design and preparation of rock wool insulation decoration integrated board.Carried out rigid foam polyurethane composite board(PU),extruded polystyrene foam board(XPS),rock wool(RW)compression,tensile,shear strength and other mechanical behavior tests.Preparing and testing the tensile strength of the designed rock wool thermal insulation decoration integrated board.ABAQUS software is used to simulate the heat transfer of the three thermal insulation systems without thermal insulation layer,sandwich thermal insulation system,and thermal insulation decoration integrated system.The mechanical test results show that the mechanical behavior s of PU,XPS and RW have obvious differences,and the influence of material density and fiber arrangement direction on the mechanical behavior s of the material cannot be ignored.The failure mode of the integrated board specimen is ideal,and the tensile strength meets the specification requirements.The heat transfer simulation temperature cloud chart clearly shows the temperature distribution in the envelope structure in a stable state:the temperature inside the wall without insulation layer is linearly distributed;the temperature distribution in the sandwich insulation system is uneven;the temperature distribution of the integrated insulation decoration system is uniform And the heat flux density is the smallest,and it has good thermal insulation performance.(2)Experimental study on tensile bonding behavior of rock wool thermal insulation decoration integrated board.The tensile bonding behavior tests were carried out on the integration of rock wool insulation decoration board with different core materials(PU,XPS,RW),different bonding layer thickness(2mm,4mm,6mm,8mm,10mm),different back sheet layer punching rate(0%,1.7%,3.4%,5.1%)and different interface characteristics(calcium silicate backing layer,interface agent.The test results show that the tensile bonding behaviors of the three integrated boards of PU,XPS,RW have obvious differences;the tensile bonding strength increases with the increase of the thickness of the bonding layer;after punching the calcium silicate backing layer,the tensile bonding behavior of the integrated board can be significantly improved,but the improvement of the tensile bonding strength by continuing to increase the punching rate is small;the rock wool integrated board that has undergone interface treatment has a material utilization rate of 93.64%and a safety reserve of 1.62 times,which can meet the requirements of thermal insulation,sound absorption and fire prevention while ensuring the tensile bonding strength.(3)Experimental study on the shear bonding behavior of rock wool thermal insulation decoration integrated board.The shear bonding behavior tests were carried out on the integration of rock wool insulation decoration board with different core materials(PU,XPS,RW),different bonding layer thicknesses(2mm,4mm,6mm,8mm,10mm),and different back sheet layer punching rates(0%,1.7%,3.4%,5.1%)And different panel sizes(6mm×6mm,6mm×8mm,6mm×9mm,6mm×10mm,6mm×12mm,8mm×6mm,9mm×6mm,10mm×6mm,12mm×6mm).The test results show that the rock wool integrated board has the highest shear bond strength;the shear bond strength increases with the thickness of the bonding layer;after punching the calcium silicate backing layer,the shear bonding performance of the integrated board can be significantly improved,but the improvement of the punching rate is very small;The shear bond strength decreases with the increase of the shear height,and increases with the increase of the shear width;there is a cubic function relationship between the shear bond strength and the ratio of the shear height and the shear width(aspect ratio),and the relationship between the aspect ratio and the thickness of the bonding layer is a binary quadratic function.