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 2019-1-2 WO2018181779 (A1)

Molded article using hydraulic lime and method for producing same

(22) 29.03.2018 (43) 04.10.2018 (57) [Problem] To provide a molded article that uses hydraulic lime and a method for producing same. [Solution] A molded article having a flexural strength of at least...


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...

Issue 2017-5 US 2017/0073239 A1

Shape-controlled cement hydrate synthesis and self-assembly

(22) 06.05.2015 (43) 16.03.2017 (57) In some embodiments, the present disclosure pertains to methods of forming calcium-silicate-hydrate particles by mixing a calcium source with a silicate source. In...

Issue 2016-9 US 2016/0207834 A1

Binder comprising calcium sulfoaluminate cement and a magnesium compound

(22) 02.09.2014 (43) 21.07.2016 (57) The present invention relates to a binder comprising calcium sulfoaluminate (CSA) cement and a magnesium compound, to a method of enhancing strength development...

Issue 2017-4 WO 2017/017376 A1

Long-workability calcium aluminate cement with hardening ­promoted by a temperature increase, and related use

(22) 27.07.2016 (43) 02.02.2017 (57) The invention relates to a calcium aluminate cement containing a calcium aluminate with a first crystallized mineralogical phase of calcium dialuminate CA2,...