Publications de Karen Scrivener

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The long-term expansion of calcium aluminate cement and calcium sulfoaluminate cement in the presence of added gypsum has been studied for samples cured under water. Progressively higher amounts of gypsum were added to the CAC or CSA and it was found that ...

X-ray powder diffraction (XRD) was used to characterize and quantify nano-crystalline C-S-H in hydrated tricalcium silicate (C3S), Portland cement, and siliceous fly ash blended cement using Rietveld analysis with partial or no known crystal structure (PON ...

In this study, the C-A-S-H composition, morphology and density are characterized for Limestone Calcined Clay Cement (LC3-50) blends containing clays with various kaolinite contents. Significant incorporation of aluminium is observed for LC3-50 blends compa ...

The kinetics of hydration of cementitious materials is sensitive to the mixing procedure. High shear mixing conditions lead to an increase in the kinetics of hydration at early age compared to low shearing conditions such as hand mixing. In this study the ...

n limestone calcined clay cements (LC3), more hemicarboaluminate and monocarboaluminate is observed, as compared to other blended cements, from the reaction of metakaolin with limestone. In this study, it is shown that the formation of these carboaluminate ...

In this work, the uniaxial creep in compression during the first days of hydration is studied experimentally on cement pastes with w/c of 0.50. to order to assess the effect of the evolving microstructure on creep, the so-called equivalent systems are empl ...

High-performance concrete is sensitive to early-age cracking, mainly due to its rapidly-developing autogenous shrinkage. Autogenous shrinkage and internal relative humidity (RH) decrease are direct consequences of the emptying of capillary pores due to cem ...

Hydration of C(3)A-gypsum systems with different gypsum additions was investigated in terms of the phase assemblage, kinetics and microstructural development. The second stage of the reaction, which begins after the depletion of gypsum, was of particular i ...

This article presents a new model for the main hydration peaks of tricalcium silicate and alite on the assumption that C-S-H nucleates and grows as needles. The model relies only on directly observable quantities and reproduces the transition from the acce ...

A fundamental research on cementitious materials at a Nanocem consortium comprising 21 academic and 11 industrial partners from 11 European countries is discussed. The research programme of the network consists of three core projects which includes hydrate ...

X-ray powder diffraction allows direct measurement of the phase content in cement. More recently, whole pattern approaches such as the Rietveld method show an improvement in both within (repeatability) and between laboratory (reproducibility) precision. Th ...

The high solution to solid ratio normally used for the measurement of chloride binding isotherms, leads to a leaching of ions and a decrease of pH. To make binding test more representative of on-site conditions, we investigated the influence of the increas ...

It was recently proposed that the induction period observed during the hydration of tricalcium silicate could be explained by the build-up of ions in solution. Due to the importance of defects in this mechanism, this work describes the effect of different ...

The usage of industrial by-products and natural resources has already been acknowledged as a viable option for lowering the CO2 emissions in cement production. The utilization of locally available materials as supplementary cementitious material (SCM) pres ...

Rietveld quantitative phase analysis has become a widespread tool for the characterization of Portland cement, both for research and production control purposes. One of the major remaining points of debate is whether Portland cements contain amorphous cont ...

Karen Scrivener

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Expansion mechanisms in calcium aluminate and sulfoaluminate systems with calcium sulfate

Quantification of nano-crystalline C-S-H in hydrated tricalcium silicate, Portland cement and fly ash cement using PONKCS method

Investigation of C-A-S-H composition, morphology and density in Limestone Calcined Clay Cement (LC3)

Effect of mixing on the early hydration of alite and OPC systems

The reaction between metakaolin and limestone and its effect in porosity refinement and mechanical properties

Basic creep of cement paste at early age - the role of cement hydration

Prediction of self-desiccation in low water-to-cement ratio pastes based on pore structure evolution

Hydration of C(3)A-gypsum systems

Influence of the gypsum amount on the hydration of tricalcium aluminate in C3A-gypsum and in alite-C3A-gypsum systems

The needle model: A new model for the main hydration peak of alite

An algorithm to compute damage from load in composites

Reply to the discussion by E. Gartner of the paper "Dissolution theory applied to the induction period in alite hydration"

Nano-scale research on cementitious materials

Micro-scale chemical speciation of highly heterogeneous cementitious materials using synchrotron-based X-ray absorption spectroscopy

The impact of calcite impurities in clays containing kaolinite on their reactivity in cement after calcination (vol 53, 44, 2020)

Application of the Rietveld method to the analysis of anhydrous cement

Influence of pH on the chloride binding capacity of Limestone Calcined Clay Cements (LC3)

Impact of Annealing on the Early Hydration of Tricalcium Silicate

Screening Regionally Available Natural Resources Andwaste Streams as Potential Supplementary Cementitious Material

The existence of amorphous phase in Portland cements: Physical factors affecting Rietveld quantitative phase analysis