The attapulgite clay refers to a natural non-metallic clay mineral with attapulgite as the main mineral component. The attapulgite is an aqueous magnesium-rich aluminosilicate mineral with a special fibrous crystal morphology, which has a unique Layer chain structure characteristics. The attapulgite clay has the unique properties of adsorption, thixotropy, colloid, filling, thermal stability and salt resistance, and is known as "the king of all soils".
In this experiment, the effect of high-viscosity attapulgite clay on the compressive strength, softening coefficient, pressure-shear bond strength and other properties of EPS particle insulation mortar was studied to improve the overall performance of thermal insulation mortar. The amount of fixed redispersible polymer powder VAE was used to change the content of high-viscosity attapulgite clay. The amount of high-viscosity attapulgite clay was designed according to the internal mixing method, followed by 0%, 2%, and 4% of the cementitious material. %, 6%, 8% and other qualities replace cement, and the effect of VAE and high-viscosity attapulgite compound on the performance of thermal insulation mortar was studied.
1 Raw materials and test methods 1.1 Raw materials Cement, Conch brand P*O42.5 cement produced by China Cement Plant; high-viscosity attapulgite clay, supplied by Jiangsu Nonmetal Mining Co., Ltd.; redispersible polymer powder, German Wacker Production of vinyl acetate/ethylene copolymer powder (VAE); high-efficiency water-reducing agent, produced by the Jiangsu Provincial Academy of Sciences Bote New Material Co., Ltd. naphthalene superplasticizer. EPS particle, broken EPS particle, bulk density 14.1kg/m3; water, tap water; fiber, polypropylene fiber, its length is 1.2 Test method EPS particle heat preservation mortar basic performance test EPS particle heat preservation mortar compressive strength, compression shear adhesive The knot strength and softening coefficient are in accordance with the method specified in JG 158-2004.
1.2.2 Linear Shrinkage Refer to the Basic Performance Test Method for Building Mortars (JGJ 70-90). The test specimens shall be covered with polyethylene film after forming.
3 Conclusion From the consideration of the softening coefficient of EPS particle insulation mortar, the suitable amount of high-viscosity attapulgite in thermal insulation mortar is 2%-6% of the cementitious material. When the amount of high-viscosity attapulgite in EPS particle insulation mortar is 2%å’„%. , Can improve the insulation adhesive mortar shear bond strength.
Considering the linear shrinkage rate of thermal insulation mortar, the content of high-viscosity attapulgite should not be greater than 2% of the mass of the cementitious material. High-viscosity attapulgite and VAE composite modified EPS particle insulation mortar, the softening coefficient and adhesive strength of thermal insulation mortar Improvements have been made to improve the water-resistance of the thermal insulation mortar and the bond strength of the substrate. The suitable amount of high-viscosity attapulgite in the EPS particle insulation mortar is 2% of the quality of the cementitious material. The composite modification of the thermal insulation mortar was obtained through experimental research. Agents - high-viscosity attapulgite and VAE compound modifiers improve the performance of insulation mortar and reduce costs.
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