| Today,with the demands of the buildings.the prefabricated buildings are widely used in all kinds of buildings.But because the prefabricated buildings need to be customized in the factory,it cannot guarantee a deadline,and price also exceed expectation,And it is impossible to from the rich and beautiful shape in the tradition castin-shape concrete structure.Decorative components made of GRC materials can have the decorative effect of tradition concrete structure,Which makes decorative components made of GRC materials yielding unusually brilliant results among the prefabricated buildings.After it gives the detailed introduction of lightweight concrete ang GRC materials in this paper,it researches the shrinkage performance of a new type of PLC-GRC composite wallboard.It is researched in relation to the shrinkage properties of a single material.And it pays more attention to research the shrinkage performance of two different materials,light concrete and GRC materials of their composite exterior wall panel.In this paper,the main research object is a single lightweight concrete outer wall panel,a single GRC outer wall panel,panel,and different thickness GRC decorative layer PLC-GRC composite wallboard(10mm.15mm)a composite wallboard PLC-GRC with different connection modes,such as flush joint,roughing and wire mesh.The results of shrinkage performance experiment show that:(1)Through the research and analysis of the shrinkage performance of the GRC decorative layer with different thickness on the new PLC composite wallboard,it can be seen that the composite outer wall panel with 15 mm thick GRC material decorative layer has the largest shrinkage strain decline on the surface and inside.The surface shrinkage strain of the composite exterior wall panel with 15 mm thick GRC material decorative layer is reduced by 58% compared with 10 mm thick GRC materials.The surface shrinkage strain of the composite exterior wall panel with 15 mm thick GRC material decorative layer is reduced by 0.7% with 10 mm thick GRC materials.By analyzing the shrinkage strain curve,it can be seen that the shrinkage strain curve of the composite wallboard of the 15 mmGRC decorative layer is relatively close to that of the GRC layer during free shrinkage.The comprehensive comparison shows that the shrinkage performance of the new PLC-GRC composite wallboard with 15 mm thick GRC decorative layer is better than the new PLC-GRC composite wallboard with 10 mm GRC decorative layer.(2)Through the research and an analysis of the shrinkage strain data of the composite outer wall panel with different connection modes,it can be known that compared with the pure GRC material,the reduction of surface shrinkage strain of the composite outer wall panel with roughing joint is 62%;the maximum reduction of internal shrinkage strain of the composite outer wall panel with wire mesh joint is 14% From the three sets of wall panel shrinkage strain data of different connection methods,it can be seen that when the interface is connected by flat connection and steel wire mesh,the shrinkage constraint on the GRC layer is relatively small compared to the rough surface connection,which can effectively improve the generation of cracks.Comparing the shrinkage strain curve,it can be seen that the curve of the strain of the flat joint with time is more suitable for the curve of the free contraction state,which fully shows that the flat joint is more effective than the steel mesh connection and the brushed connection.Improve the shrinkage performance of the composite wallboard.(3)The curve of shrinkage strain over time obtained by finite element software simulation is basically consistent with the curve of shrinkage strain over time obtained by experimental data analysis,and the average error value of the interior and GRC surface of lightweight concrete is less than 10% of the control Errol of the finite element software simulation and recording and finite element simulation results are reliable and can provide a reliable reference value.Figure [75] table [7] reference [63]... |
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