Experimental Research On The Mechanical Properties Of Ceramsite Concrete Core Self-Insulation Wallboard

In modern architecture, with an increasing demand for building energy efficiency, architectural technology and architectural using function, it is required that wall, which constitutes a large proportion of architectural structure, should have functions for green environmental protection, thermal insulation,lightweight and high strength, small occupation area and economic rationality. But the traditional wall made of a single material already cannot meet the requirement for multiple functions, so a structural material with certain bearing capacity can be combined with a thermal insulation material to form a composite wallboard, to bring the advantages of each material into full play, to meet the requirements for both multiple functions and economic rationality.Ceramsite concrete core self-insulation wallboard is a composite wallboard consisting of a welded grid skeleton made of galvanized small-gauge wires, a thermal insulation interlayer made of extruded polystyrene, and a ceramsite concrete cover material placed on both sides. Such a board is characterized by energy conservation, light weight, high strength and thermal insulation, sound insulation, strong fire resistance, and good overall performance.This paper primarily researched the mechanical properties of ceramsite concrete core self-insulation wallboard under different structure types by experiment. It first researched the impact of cement quantity per unit volume, net duty of water, sand ratio, total aggregate volume, and water reducing agent dosage on the strength of ceramsite concrete by an orthogonal mix ratio test. The research result shows that the strength of ceramsite concrete increased with the increase of cement quantity per unit volume, but the increasing amplitude decreased and became less commercial after the quantity reached a certain value. An economical and rational range should be set between 335 kg/m3 and 345 kg/m3; when the net duty of water per unit volume increased, the water volume would enhance the strength of ceramsite concrete, and when the water consumption exceeded a certain range, the strength of ceramsite concrete would decrease. An economical and rational range should be set between 145 kg/m3 and 155 kg/m3; owing to the limited experimental group number and the interaction between various mixing amounts, the impact of sand ratio on the strength of ceramsite concrete didn't achieve the expected effect. It's suggested that mixing amount should be set between 35% and 37%; an increase in the total aggregate volume would reduce the strength of ceramsite concrete, and a rational range should be set between 1.1 m3 and 1.3 m3; the impact of the 5factors on the strength of ceramsite concrete in a decreasing order: water,water reducing agent, cement,sand ratio and total aggregate volume. Afterwards, 7 groups of test pieces were designed for the wallboard according to the difference in strength of surface ceramsite concrete, reinforcement ratio of steel wire mesh,bar-inserting form and hole ratio of core material. The experimental research indicates: an increase in the strength of ceramsite concrete and the reinforcement ratio of steel wire mesh could improve the ultimate bearing capacity of wallboard; compared with oblique bar inserting, straight bar inserting reduced the mechanical properties of the wallboard, but enhanced its global stiffness; opening holes in the core layer strengthened the interrelation between the three layers of materials, and improved the overall stability of the wallboard, but the bearing capacity of the wallboard was reduced due to uneven loading and a certain extent of stress concentration.Finally, this paper made a simplified calculation of the bearing capacity of the ceramsite concrete core self-insulation wallboard by means of a truss model based on Abaqus, and compared the test results,discovering that the results were basically the same, that the test pieces had certain emergency capacity in the condition of a certain reinforcement ratio, and that the failure mechanism of the test pieces was close to the theoretical calculation. The calculation result reached the required value after the model size was expanded to the actual engineering size, suggesting that it is feasible to design a test scheme the same as that in this paper and calculate the bearing capacity of such a wallboard by a simplified truss model.