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CemGEMS web app tutorial

Version 0.7.0 beta

Accessing CemGEMS web app

CemGEMS web app is accessible anywhere, anytime, in any web browser (except Internet Explorer) by navigating to

Internet access is required to log in (log out) and to equilibrate recipes or simulate processes.


CemGEMS v.0.7.0 beta contains breaking changes, see changelog. To properly activate these changes and retain your previous recipes, after the upgrade (announced per e-mail to all registered users), please do the following: (i) if you have cloned and set up your own process definitions, make sure that you have all relevant information (hydration model parameters, span targets and intervals, time intervals) available as text or spreadsheet; (ii) log out (if you have not yet done so in this web browser); (iii) navigate to and reload the browser page; (iv) login again and continue working. No recipes must be fixed, just re-equilibrated. However, because of radical changes in process document format, all processes must be deleted, re-created (see tutorial pages) and re-computed. Before deleting and re-creating old processes, you can use the JSONeditor (the pencil icon located on the top level of the new Process Settings Table) to check the parameters and the time or span intervals in your old process definition. If you switch the JSONeditor from "Tree" to "Code" mode, you can even copy-paste the whole JSON document or parts of it into a text file, to use it later for adjusting the newly-created process. This can be especially useful for restoring processes that use mP&K and/or 5PL built-in models with parameters that you have modified. In case of problems, clean up the application memory in the browser as described in the troubleshooting page, and login again. Due to the continued development, the chance of breaking changes and partial loss of user data upon upgrades may persist until the final v.1.0.0 release.


The CemGEMS web app can compute isothermal and adiabatic heat effects of cement hydration. These calculation results are in part approximate and should be viewed as provisional only, until a sequence of testing, benchmarking and verification steps is completed in future releases.

Next steps: Getting started

Provide your feedback

Dear User! Your feedback is paramount for the developers to make CemGEMS web app truly useful, funny and pleasant to work with. To assist you, we provide a button with a dialog, as shown on this screen image:

Feedback form image

Clicking on "Compose email" button will open up your default email composer, where you can enter your text and attach screen images, or (better) put them onto your cloud drive and add the URL link to email that will go to admin

Last update: April 4, 2022