Science & technology blog by CHRYSO
CASE STUDY: Optimization of clinker content in limestone-based cements - Ball Mill process

OBJECTIVE This case study is based on a real field trial to produce cement with lower carbon footprint optimazing clinker factor and SCM content. The 2 main objectives of the field trial were: From product side: to substitute Type 1 cement (CEM I) by Type 1L cement (CEM II/A-L) maintaining strength profile equal or better […]

Activation of slag blended cements by amines

Cements containing blast furnace slags such as CEM III cements are increasingly used in both precast and ready-mixed concrete to improve the environmental footprint. However, the replacement of clinker by slag at a content varying between 35 and 95 wt% leads to a significant slow-down of cement hydration and consequently to a loss of early […]

LuminTech®, coloured photoluminescent particles for decorative concrete

The introduction of luminescent pigments in materials in order to provide visibility in low light or zero brightness (night, shade, darkness, interior unlit due to an electric failure...) is sought. There are different types of luminescence depending on the excitement: bioluminescence with enzymatic excitation, thermoluminescence with thermal action… Photoluminescent particles have the property of absorbing […]

Improving VRM stability to achieve higher clinker factor reduction

In some specific process conditions (e.g. Vertical Roller Mills), the use of conventional high performance strength enhancers can lead to process limitations. These sides effects are often controlled by reducing the dosing rate of cement additive. However, this leads to a lack of grinding aid in cement to achieve all the benefits from the chemicals. […]

Overtaking cement grinding process limitations to reach full cement activation potential

The performance of conventional strength enhancers can be limited by different grinding process constraints. An example is given with a process design based on a combined high-pressure-roller-press with single chamber ball mill and 3rd generation separator. It is stressed a high process sensitivity with strength enhancers. This demonstrates the direct impact of too powerful strength […]

Activation of blended cement by amine additives

In order to reduce CO2 emissions coming from cement production, manufacturers are increasingly making use of supplementary cementitious materials (SCMs). However, the use of SCMs such as slag, fly ash or limestone usually leads to a decrease of cement strength performances, especially at early age. The addition of an efficient activator can allow to compensate this loss of performances. Different molecules and salts can […]

Thixotropy and Fill-Free® admixtures

Cement pastes are thixotropic; left at rest, their rheological constants —among which viscosity— increase over time. Under steady shear, cement paste viscosity decreases (which qualifies it as shear-thinning) but may take some time to reach a steady value (which qualifies it as thixotropic). Flow steadiness is highly useful in most concrete operations; as will be […]

Interaction between clays and polycarboxylate superplasticizers

The robustness of PolyCarboxylate Ether (PCE) superplasticizer performance is challenged by the variable amount of clay minerals in aggregates. It will be shown here how a swelling clay like Montmorillonite interacts with polymers, interfering with their ability to disperse cement particles thus influencing the rheological behavior of concrete. Here, the mechanisms governing this interaction will […]

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