In a method for producing a concrete foundation for a wind power tower externally preloaded and made of precast concrete parts, a formwork for the concrete foundation is erected, core elements for producing passage openings in the concrete foundation for the loading elements are positioned and fixed on the formwork, and the concrete foundation is cast. A measurement reference system is established in order to position the core elements, at least one first positioning aid having an adapter device for a core element and having at least one reference segment is provided on the formwork. A corresponding concrete foundation is produced in accordance with the described method. A positioning device for orienting core elements in a concrete foundation comprises at least one first positioning aid, which has an adapter device for a core element and at least one reference segment for calibrating the first positioning aid.

Described is moisture-controlling insulation apparatus that allows water and moisture to move from the space between an interior and exterior wall of a building to a drainage system. The water moves along a series of interconnecting channels in the apparatus. The channels are configured such that water will not settle in the channels before reaching the drainage system.

A cementitious composite for in-situ hydration includes a structure layer having a first side and an opposing second side, a cementitious material disposed within the structure layer, a sealing layer disposed along and coupled to the first side of the structure layer, and a containment layer disposed along the opposing second side of the structure layer. The structure layer has an intersection at the sealing layer and the containment layer that is at least partially fiberless. The cementitious material includes a plurality of cementitious particles. The containment layer is configured to prevent the plurality of cementitious particles from migrating out of the structure layer.

A leakage monitoring system for geomembranes comprises a power supply unit having two supply electrodes made from a nonmetallic conductive material and respectively connected to a membrane top and a membrane bottom of a primary geomembrane; a plurality of monitoring sensor electrodes made from the nonmetallic conductive material, uniformly arranged below the primary geomembrane and used for acquiring potentials at corresponding positions below the primary geomembrane; a data acquisition unit used for acquiring potential data of each monitoring sensing electrode; and a control and analysis unit used for analyzing the potential data of each monitoring sensor electrode acquired by the data acquisition unit, determining an abnormal potential area below the primary geomembrane to determine a leakage position of the primary geomembrane and giving an alarm. The abnormal potential area below the geomembrane can be determined to determine the specific leakage position of the geomembrane and give the alarm.

Improved containment mats and systems of containment mats may include multiple adjoining mats with a top surface and a bottom surface. The multiple mats may provide a modular structural mat system that may be installed at a drill site, with multiple mats placed adjacent to each other with a lap joint connecting adjacent mats. A geotextile may be used to cover the lap joints and a coating applied to the geotextile. Such a system may provide containment of potential spills, a reliable working surface for drilling operations, and relatively fast and less expensive installation.

A barrier tape comprises a barrier section comprising one or more barrier layers and one or more adhesive layers adhered to a face of the barrier section. The barrier tape can be used to join together adjacent barrier sheets or to patch a breach in a barrier sheet to form a barrier assembly.

Drive-over berm systems that protect raised sections of protective containment liners from truck and heavy equipment damage are disclosed. A ramped outer berm abuts an elevated portion of the liner, which may be raised to a desired height by an insert positioned under the liner. A ramped inner berm may about the elevated portion of the liner, and a connector plate may be used to secure the outer and inner ramped berms together. The height of the raised portion of the liner is selected to provide the desired sump capacity of the containment area. The inner berm and/or outer berm may be provided in sections that can be connected end-to-end.

A device and method for keeping water away from a main concrete slab sitting on a concrete footing of a building include a joint covering an intersection of the external side surface of the foundation wall and the top surface of the footing. The joint can include a plurality of wedge blocks positioned adjacent the intersection providing an inclined surface for the water to flow away from the intersection, and typically one water resistant membrane ensuring the impermeability of the joint. Alternatively, the device and method include at least one through hole extending through the footing, and sloping downwardly from the internal side surface to the external side surface, and below the top surface of the footing, to drain water away from the area under the slab. A drain pipe may also be inserted into the hole.

A device and method for keeping water away from a main concrete slab sitting on a concrete footing of a building include a joint covering an intersection of the external side surface of the foundation wall and the top surface of the footing. The joint can include a plurality of wedge blocks positioned adjacent the intersection providing an inclined surface for the water to flow away from the intersection, and typically one water resistant membrane ensuring the impermeability of the joint. Alternatively, the device and method include at least one through hole extending through the footing, and sloping downwardly from the internal side surface to the external side surface, and below the top surface of the footing, to drain water away from the area under the slab. A drain pipe may also be inserted into the hole.

A system and method for selecting a proper fan for an air flow system for mitigating radon in a building. An air flow system includes a pipe connected to an access hole extending through the center of a slab and into the underlying soil. A test hole also extends through the slab. A variable speed test fan is installed in the pipe, and a manometer is installed to measure a static pressure value of the overall system. A chart or a computer program is configured to correlate a particular speed of the test fan and a particular static pressure value when the test fan creates an initial draw at the test hole with an identification of a proper fan. The proper fan has an operating speed which is closest to the particular speed. The proper fan is then installed in place of the test fan in the air flow system.