Study On Multi-row Perforated Concrete Wall Board With Built-in Sound Insulation Material

Clay brick wall,block wall,light weight slab and aerated concrete slab are used in many traditional building walls and space separation materials,which are gradually replaced by various new lightweight composite walls due to their defects of self-weight,wall thickness and low recycling rate.The multi-row hole concrete wallboard with built-in sound insulation material is a new type of lightweight cross-sectional sound insulation wall,which can be widely used in the built-in partition wall of assembled buildings,with low surface density,good sound insulation performance,low cost,simple and practical characteristics.In this paper,a wall model is established to carry out the acoustic transmission loss experiment and COMSOL Multiphysics simulation study on the new double-layer multi-row hole wall plate with cross section,and the influence degree of each parameter on the sound insulation effect is compared and analyzed.The main research and conclusions are as follows:(1)The tests on the basic properties of dry density,water absorption and compressive strength of the cube test block of wall foamed concrete were completed,the pouring of multi-row hole wall with built-in sound insulation material and the experiment of sound insulation chamber were completed.(2)The experiment of the wall panel sound insulation chamber shows that the sound insulation capacity of the multi-row hole wall with built-in sound insulation material is increased by nearly 20 dB compared with that of the dense wall,and the multi-row hole can reduce the wall surface density by nearly 20%when the sound insulation capacity of 3 dB is sacrificed.(3)The numerical simulation software COMSOL Multiphysics was used to establish the wall model of sound-solid Multiphysics field and set the corresponding experimental parameters to realize the numerical solution of sound-solid coupling.The effects of five different parameters,such as the radius of multi-row holes,the flow resistance of foamed concrete,the distance between multi-row holes and sound insulation layer,the thickness of sound insulation layer and ordinary concrete,on the acoustic transmission loss of wallboard were studied.(4)The simulation results show that the variation of hole radius leads to a small difference in the average sound insulation.The flow resistance of foamed concrete is one of the most important factors affecting the sound insulation capacity.(5)The sound transmission loss of the wall was not significantly affected by the change of the distance between the double-layer multi-row holes and the sound insulation layer.However,as the thickness of the built-in sound insulation layer increases,the sound insulation capacity of the wall panel will increase accordingly.Compared with foamed concrete,ordinary concrete is superior to foamed concrete in sound insulation performance in the low frequency segment due to the mass law,while the sound transmission loss in the high frequency segment is close to that in the high frequency segment.(6)Based on the parameters and analysis of the experiment and simulation,this kind of double-layer multi-row wall with a total thickness of120mm and a surface density of 86kg/m~2 can achieve sound insulation capacity of 62.0dB.The cross-sectional combination method is the sound insulation layer with a thickness of 15mm in the middle,and the two-side multi-row hole radius is 15mm and the foam concrete wallboard with a large flow resistance has the best sound insulation performance.