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The application discloses a method for preparing a graphite / aluminum layered composite material by means of pulse current, and relates to the technical field of composite materials, in particular to a method for preparing a graphite / aluminum layered composite material by means of pulse current.The method comprises the following steps: pretreating an aluminum alloy to obtain an aluminum alloy piece; pretreating graphite to obtain a graphite piece; stacking the aluminum alloy piece, the graphite piece and the aluminum alloy piece in sequence to form a connecting assembly; placing the connecting assembly in the middle of electrodes of a pulse current diffusion connecting device; connecting the connecting assembly by applying pressure and pulse current under a protective atmosphere; and heating and cooling to room temperature to obtain a composite substrate.The method directly heats the connecting assembly by means of pulse current, can efficiently utilize energy, and maximally reduces energy loss; and by means of the field-induced effects of joule heat, electromigration and electric plasticity of the pulse current, element diffusion can be accelerated, and the process time required for bonding can be reduced, so that time cost is reduced.The application further discloses a composite substrate, which comprises two aluminum alloy pieces and one graphite piece.

The invention relates to a monitoring device (8) of a slipform paver for monitoring the compaction of concrete placed in a slipform of the slipform paver by at least one concrete compaction device (7) having a hydraulic motor (19) for driving an imbalance of the generated vibrations. Furthermore, the invention relates to a method for monitoring the compaction of concrete placed in a slipform of a slipform paver by means of at least one concrete compaction device having a hydraulic motor for driving a vibration-generating imbalance. The monitoring device (8) according to the invention and the method according to the invention are characterized in that the pressure in the hydraulic fluid system (11) is measured by at least one pressure sensor (25.1, 25.2, 25.3, 25.4) arranged in the hydraulic fluid system (11), which generates a pressure signal dependent on the pressure in the hydraulic fluid, and a conclusion of compaction of the concrete placed in the slip form is obtained based on analysis of the pressure signal.