Study

Partial replacement of cement for waste aggregates in concrete coastal and marine infrastructure: a foundation for ecological enhancement?

  • Published source details McManus R.S., Archibald N., Comber S., Knights A.M., Thompson R.C. & Firth L.B. (2018) Partial replacement of cement for waste aggregates in concrete coastal and marine infrastructure: a foundation for ecological enhancement?. Ecological Engineering, 120, 655-667.

Actions

This study is summarised as evidence for the following.

Action Category

Use environmentally-sensitive material on subtidal artificial structures

Action Link
Biodiversity of Marine Artificial Structures
  1. Use environmentally-sensitive material on subtidal artificial structures

    A replicated, randomized, controlled study in 2016 in a marina in the Plym estuary, UK (McManus et al. 2018) found that replacing standard Portland-cement with Ground Granulated Blast-Furnace Slag (GGBS), Pulverized Fly Ash (PFA), or a mix of both, in concrete settlement plates did not affect the diatom species richness or abundance on plates, or the non-native macroalgae and non-mobile invertebrate species richness or community composition, but had mixed effects on the native species richness and community composition, depending on the cement used. Over four weeks, diatom species richness and live cover was similar on GGBS-concrete (2 species/plate; 19% cover), PFA-concrete (2/plate; 12%), mixed-concrete (2/plate; 20%) and standard-concrete (2/plate; 12%) settlement plates. After seven weeks, native macroalgae and non-mobile invertebrate community composition differed on different materials (data reported as statistical model results), but it was not clear which materials differed. Native species richness was similar on PFA-concrete (8 species/plate) and standard-concrete (9/plate), but lower on GGBS-concrete (8/plate) and mixed-concrete (7/plate) than standard-concrete. Non-native community composition and species richness was similar on all materials (1–2 species/plate). Settlement plates (20 × 20 mm) were moulded with recycled cement (GGBS, PFA, or a mix of both) or standard Portland-cement. Eighty of each were suspended vertically, randomly arranged, beneath floating pontoons at 0.5 m depth in June 2016. Diatoms on plates were counted using a scanning electron microscope over four weeks, and macroalgae and invertebrates in the laboratory after seven weeks.

    (Summarised by: Ally Evans)

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 18

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust