UNIVERSITY OF KASSEL

Raising the quality of calcium silicate units with simultaneous reduction of production costs using Statistical Design of Experiments (DoE)

Fundamental investigations were carried out to optimise the production process for calcium silicate units with the aim of saving costs and energy. The statistical design of experiments (DoE) approach was employed because of the large number of possible variations, and a mathematical model was set up. This model can be used to predict the brick compressive strength.

1 Introduction

Calcium silicate units are masonry blocks formed from burnt lime and silicate raw materials that are autoclaved in an atmosphere of high-pressure steam at approx. 200°C and 16 bar. The autoclaving process results in the formation of calcium silicate hydrate phases (CSH phases), which are responsible for the necessary compressive strength. The autoclaving process defines the setting reactions of the calcium silicate units and accelerates the formation of the CSH phases [1]. This process is a very energy- and cost-intensive factor for the manufacturing industry. Optimally...

Related articles:

Issue 12/2016 FORSCHUNGSVEREINIGUNG KALK-SAND E.V./TU CLAUSTHAL

Use of natural heavy mineral sands for increasing the gross dry density of calcium silicate units

1 Introduction Commercial-grade calcium silicate units are produced from lime, natural mineral aggregates and water in a process called hydrothermal curing. Also referred to as steam curing, the...

more
Issue 5/2019 FORSCHUNGSVEREINIGUNG KALK-SAND E.V.

Current research findings on calcium-silicate unit production technology

1 Introduction Calcium-silicate (CS) units are made from the starting materials sand, lime and water. The raw materials are proportioned by weight, intensively mixed together and fed into reactors on...

more
Issue 03/2024 WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Research on the correlation between autogenous shrinkage and compressive strength of mortar modified by styrene-butadiene rubber

1. Introduction Autogenous shrinkage is the self-deformation of cement-based materials independent of ambient temperature and humidity changes and external load conditions, and is the sum of...

more
Issue 3/2018 HEIDELBERGCEMENT AG

HeidelbergCement to sell its calcium silicate unit business

In in the middle of December 2017 HeidelbergCement announced that it has signed an agreement with H+H International A/S and its subsidiary H+H Deutschland GmbH to sell its German and Swiss calcium...

more
Issue 05/2011

EN 459 – the new European standard for building lime

1?Introduction Until 1995, the product “building lime” (Fig. 1) was subject in a number of European countries only to national regulations. National technical rules concerning this product were then...

more