Sentence:  In the autumn there was a row at some <WSD>cement</WSD> works about the unskilled labour men. A union had just been started for them and all but a few joined. One of these blacklegs was laid for by a picket and knocked out of time. 
Meaning of the word marked with <WSD> tags:  A powdered substance produced by firing (calcining) calcium carbonate (limestone) and clay that develops strong cohesive properties when mixed with water. The main ingredient of concrete.