A timber access mat having an electrical grounding feature includes an electrically conductive cover layer that is removably carried over the top of the body of the timber access mat. The electrically conductive cover layer can be formed from one or more sheets of expanded metal such as expanded steel. The layer is joined to a perimeter frame that includes offset connector tabs that allow mats to be positioned side-by-side. The connector tabs are paired with cable guides to protect the cable leads that connect the mats. The perimeter frame and conductive cover layer can be added to traditional timber access mats when electrical grounding is required and then removed and stored when not required.

Systems and methods for a ground water filtration system are described. The ground water filtration system includes paver blocks designed to facilitate liquid seepage between the paver blocks and to route the seepage to a preferred area. A filter may be utilized to remove undesired particulates in the seepage prior to routing. The ground water filtration system additionally provides at least one layer of stone to facilitate flow direction of the seepage. At least one geogrid fabric is also provided to further enhance ground water filtration.

An impact-absorbing assembly includes a covering layer being one or more of artificial turf, rubber mats, polymer mats, short pile carpeting, particulate infill, wood chips, and ground rubber chips. Also included is a layer of underlayment panels positioned beneath the covering layer. The panels have a panel section with a plurality of drain holes formed therethrough. A top surface of the panels is configured to support the covering layer. A bottom surface of the panels has a plurality of bottom projections that cooperate to define bottom channels suitable to permit water flow across the bottom surface, the bottom channels being in fluid communication with the panel drain holes. The bottom projections define a first spring rate characteristic that is part of a first stage and a second spring rate characteristic is part of a second stage, the first stage having a smaller volume of material than the second stage.

A heatable module for use in constructing a pathway for traffic comprises a base member having a perimeter edge. A top plate is securable to the base member in overlying relation to the top surface of the base member. An electrically powerable heater member retained by at least one of the base member and the top plate. To form a heatable pathway for traffic, the modules are placed in perimeter-edge-to-perimeter-edge relation one to the next.

A heatable pathway system for traffic comprises a first module having a first electrically powerable heater member and a second module having a second electrically powerable heater member. The first module and the second module are each installable in place to form a heatable pathway system for traffic. An electrical power controller circuit has a first power output connected in power supplying relation to the first electrically powered heater member and a second power output connected in power supplying relation to the second electrically powerable heater member. The electrical power controller circuit is operable to provide electrical power from the power outputs in a heating cycle that comprises a first heating sub-cycle and a second heating sub-cycle such that, during a heating cycle, a first one of the electrically powerable heater members is on and a second one of the electrically powerable heater members is off during the first heating sub-cycle, and the second electrically powerable heater member is on and the first electrically powerable heater members is off during the second heating sub-cycle.

A timber access mat having an electrical grounding feature includes an electrically conductive cover layer that is removably carried over the top of the body of the timber access mat. The electrically conductive cover layer can be formed from one or more sheets of expanded metal such as expanded steel. The layer is joined to a perimeter frame that includes offset connector tabs that allow mats to be positioned side-by-side. The connector tabs are paired with cable guides to protect the cable leads that connect the mats. The perimeter frame and conductive cover layer can be added to traditional timber access mats when electrical grounding is required and then removed and stored when not required.

A pavement slab includes a top surface, a bottom surface opposite the top surface, first and second longitudinal side surfaces, each of which extends from the top surface to the bottom surface, and first and second transverse side surfaces, each of which extends from the top surface to the bottom surface. At least one transverse tube is positioned intermediate the top surface and the bottom surface and extends from an inlet at the first longitudinal side surface to a second end intermediate the first and second longitudinal side surfaces. The at least one transverse tube is sized and shaped to convey a binder material. At least one vertical tube extends from each of the at least one transverse tube to the bottom surface. The at least one vertical tube is sized and shaped to convey the binder material.

An expansion joint design for supporting transfer loads. The system includes an elongated core and at least one longitudinal load-transfer member which are bonded together.

One inch paver tiles may now be set over a concrete pad for use by vehicular traffic. The method and dry concrete mix may be used to overlay concrete driveways. The paver tiles may be laid over a dry concrete mix comprising a latex polymer, Portland cement, sand and a hydration control agent. After laying the paver tiles in a field over the concrete mix in the dry state, a border of paver tiles or other material may be laid in a wet concrete mix prior to hydrating the field paver tiles. The dry concrete mix cures after hydration to form a strong layer adhering the paver tiles to the concrete pad for use by vehicular traffic.

A permeable paving system having a base layer and a paving layer, in which the base layer is made of a plurality of substantially hollow structural modules having a rigid bottom wall and a substantially parallel to a rigid top wall retained in a fixed space relationship from each other by a plurality of spacers, in which the structural module has a plurality of side walls extending between the perimeters of the top wall and the bottom wall, in which the top and bottom walls have apertures to allow movement of fluids into and out of the structural modules, and in which the top wall has a plurality of guide lines configured for alignment of paving material, and/or as a guide for cutting the structural module. Alternatively, instead of guide lines, there may be string line posts connectable to an element of the permeable paving system configured to extend above the top wall of said structural module and configured for establishing elevations of paving materials, and/or alignment of paving materials.