Drag each concrete-technology milestone to its year on the timeline.

Exercise and reference answers

End

1980

Start

1820

Events

1. Year

   1824

   Item

   Joseph Aspdin patents Portland cement

2. Year

   1920

   Item

   First attempts to modify concrete with polymers (PVA latex)

3. Year

   1948

   Item

   Schmidt rebound hammer developed

4. Year

   1952

   Item

   Guist et al. work on PVA-modified Portland mortar

5. Year

   1959

   Item

   First experimental polymer-concrete structure (USSR mine shafts)

6. Year

   1965

   Item

   PIC produced at Brookhaven National Laboratory

Explanation