Sentence:  The objective of this study is to evaluate the impacts of vibration and consolidation of modern <WSD>slipform</WSD> pavers used in Wisconsin on the air-void structure and air content of portland cement concrete pavements. 
Meaning of the word marked with <WSD> tags:  A type of process for setting concrete which uses moveable forms that are moved and reused once the concrete is stiff enough  to retain its shape under its own weight.