Abstract: A fastening tool. In the fastening tool, a top part guiding matching portion engages a top part guiding portion in a sliding fit; a pressing part guiding matching portion engages a pressing part guiding portion in a sliding fit; a lever hinged to a base part; a transmission part engages a transmission part guiding slot in a sliding fit; the transmission part is driven to slide by the pressing part, and the lever is driven to rotate by the transmission part, then the top part is driven to slide out, due to a reaction force acting on the pressing part by the transmission part and the friction between the pressing part and the base part, the pressing part remains to be self-locked by friction, which can constrain the pressing part and the top part is locked.

Abstract: The present application relates to the technical field of ecological environment remediation, and in particular to a breathable geosynthetic clay liner and a production process therefor. The breathable geosynthetic clay liner of the present application includes an upper breathable layer, a lower breathable layer, and a breathable and impermeable sand layer sandwiched between the upper breathable layer and the lower breathable layer; and the breathable and impermeable sand layer includes breathable and impermeable particles and expansive particles. The breathable geosynthetic clay liner of the present application is convenient to construct, high in production efficiency, and free of dust during a construction process.

Abstract: A composition used for high-strength impermeable concrete. The composition contains sand, stone, cement, water reducer, water and reinforced impermeable sand. The reinforced impermeable sand includes aeolian sand and binder covering the surface of the aeolian sand. The reinforced impermeable sand can fill the gap between the sand and the stone, and well combine various components in the composition, and suppress the seepage phenomenon of the molded concrete, thereby greatly improving the strength and impermeability of the concrete.

Abstract: An anti-penetration and gas permeable potting container and preparation method thereof are disclosed. The anti-penetration and gas permeable potting container is made by bonding aggregate particles with hydrophobic binder, and pores which allow gas molecules to penetrate and liquid water molecules not to penetrate are formed between adjacent aggregate particles. Further, a potting planting container applying said potting container is disclosed, wherein it includes a cultivating layer, and a base anti-penetration layer formed of waterproof and gas permeable particles which is provided between the potting container and the bottom of the cultivating layer. Pores which allow gas molecules to penetrate and liquid water molecules not to penetrate are formed between adjacent waterproof and gas permeable particles. Said pores are thoroughly distributed on the base anti-penetration layer. The container can prevent water from flowing from its bottom, and has gas permeable property.

Abstract: A composition used for high-strength impermeable concrete. The composition contains sand, stone, cement, water reducer, water and reinforced impermeable sand. The reinforced impermeable sand includes aeolian sand and binder covering the surface of the aeolian sand. The reinforced impermeable sand can fill the gap between the sand and the stone, and well combine various components in the composition, and suppress the seepage phenomenon of the molded concrete, thereby greatly improving the strength and impermeability of the concrete.