Research For Construction Waste Recycling Powder Insulation Mortar

With the development of China’s urbanization process, urban produced a large number of construction waste. Construction waste inevitably produces a large amount of recycled fine powder in construction waste treatment process. If does not study the use of it, not only waste resources but also huge damage to the ecological environment.In this paper, the construction waste recycled fine powder used as admixture in thermal insulation mortar for construction waste recycled fine powder of high porosity, moisture content is low, rough surface, specific surface area is big, good bonding with cement, contains a small amount of active ingredient. It chooses powder polystyrene particles insulation mortar and foam insulation mortar for construction waste recycled fine powder applied research through comparison of different thermal insulation mortar.Construction waste recycled fine powder including waste brick powder and waste concrete. Each fine powder is continuous gradation particles respectively which is below0.3mm,0.15mm and0.075mm. Research on powder polystyrene particles insulation mortar and apparent density of foam slurry, cube compressive strength and softening coefficient, the influence of the coefficient of thermal conductivity by using different dosage to replace the ash calcium powder insulation mortar or cement gelled material preparation such as thermal insulation mortar.The test results show that the particles of polystyrene insulation mortar:Renewable powder with particle size, the dosage is higher, the compressive strength is smaller; With renewable content of different size powder, with the decrease of the particle size of the compressive strength has a tendency to increase. The compressive strength value most acuity0.2MPa. Softening coefficient were greater than0.5, or less thermal conductivity is0.060W/(m· K), In the powder polystyrene particles exterior insulation system materials.(JG_T158.2013) standards. Water-binder ratio of0.8, the quality of fine powder (kg):EPS size=1:7polystyrene particles insulation mortar have a better performance.Foam mortar experiment results show that the recycled fine powder dosage should not be more than40%; Regeneration of waste brick powder dosage significantly effects on dry density of foam slurry; In the same size, with the improvement of recycled powder dosage, Regeneration fine foam mortar compressive strength showed a decreasing trend, but there is still719KPa minimum strength, Softening coefficient show a increasing trend; Different size of recycled fine powder in a reasonable dosage range, Foam mortar have a better performance; Renewable powder foam slurry heat preservation performance is superior to the ordinary foam mortar, Cube compressive strength, softening coefficient can satisfy the request of GB/T20473.2006"building thermal insulation mortar. Construction waste regeneration with the mixed powder will also have a certain influence on foaming cement mortar pore structure, Recycled brick powder particle size under0.15mm and0.075mm, Content is20%, Recycled concrete powder dosage of three kinds of particle size under40%, Formation of foam mortar hole will be more evenly. Experimental data showed that dry apparent density are the main factors influencing the thermal conductivity of insulation mortar, according to Fourier heat conduction equation, combined with double the coefficient of thermal conductivity of composite plate principle, to establish the relationship between dry apparent density and thermal conductivity model. Verified by model, under the condition of the assumptions, there is a deviation model to predict, the reason of deviation is analyzed...