Publications de Karen Scrivener

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Corrosion of metal reinforcement is the most important durability concern of concrete infrastructures. In this research, chloride transport in mortars prepared using ternary blends of OPC-calcined clay-limestone (LC3) as the cementitious materials is asses ...

Through a collaborative work established between CIDEM and the Laboratory of Construction Materials at EPFL, a new cementitious system based on a synergetic combination of calcined clay and limestone as Portland's clinker replacement was developed. The nov ...

This paper investigates the effect of KOH and NaOH on C-S-H structure and solubility. Both KOH and NaOH have a similar effect, they increase pH values and silicon concentrations, and decrease calcium concentrations. At higher alkali hydroxide concentration ...

The ingress of sulfate ions into cementitious materials leads to the formation of ettringite, gypsum and other phases. The increase in solid volume through the formation of these phases is often assumed to be the only reason for expansion. In this paper we ...

This paper reports a study of ternary blends composed of calcium aluminate cement, calcium sulfate hemihydrate and limestone. Compressive strength tests and hydration kinetics were studied as a function of limestone and calcium sulfate content. The phase e ...

In this paper, the replacement of high cost silica fume with calcined clay was investigated in UHPFRC mixes. The impact of two grades of calcined clay on the hydration and microstructural development of UHPFRC matrices was investigated, where 54% of the ce ...

This chapter tells the story of Portland cement, from its invention in the tured mineral product. The success story of Portland cement is rooted in the unique combination of the abundance of its raw materials, the reactivity of the high-temperature clinker ...

The main conclusions of an analysis of low-CO2, eco-efficient cement-based materials, carried out by a multi-stakeholder working group initiated by the United Nations Environment Program Sustainable Building and Climate Initiative (UNEP-SBCI) are presented ...

A chloride mini-migration method is proposed to estimate effective diffusion coefficients at the scale of the cement paste and to investigate mechanisms with complementary microstructure analyses on the same material. Blended-cement pastes with a wide rang ...

Deciphering the calcium silicate hydrate (C-S-H) surface is crucial for unraveling the mechanisms of cement hydration and property development. Experimental observations of C-S-H in cement systems suggest a surface termination which is fundamentally differ ...

This project explores the influence of different particle size distributions of limestone on the workability and early-age strength development of LC3 materials. To quantify, and subsequently optimize, the packing, the modified Andreasen and Andersen model ...

Knowledge of the compressive strength evolution of concrete is critical for activities such as stripping formwork, construction scheduling and pre-stressing operations. Although there are several procedures for predicting concrete compressive strength, rel ...

Although supplementary cementitious materials (SCMs) are now commonly accepted and widely used, consensus has not been reached for methods to test their chemical reactivity. A multitude of test methods exist but often fall short on one or more of the key f ...

This paper presents the importance of microstructural studies for understanding concrete durability. Three examples-sulfate attack; alkali silica reaction and bacteriogenic corrosion in sewers arc used to illustrate the pitfalls which can arise from conven ...

Hydrated Calcium Aluminate Cement (CAC) is known to have a complex microstructure involving different phase assemblages strongly dependant on the temperature. This work presents an experimental approach to study the microstructure of CAC pastes from the fi ...

A new modelling platform, called mu ic has been developed to model the microstructural evolution of hydrating cement paste. The platform uses the vector approach and can be used for modelling particulate reactions including the hydration of many different ...

The effect of limestone on the hydration and microstructural development of ultra high performance concrete (UHPC) with different levels of replacement (34%, 54% and 74% by volume) was investigated. Up to 54% replacement of cement by limestone the mixes sh ...

Aluminium uptake in calcium silicate hydrate (C-S-H) was studied at different Ca/Si ratios from 0.6 to 1.6 at 20 degrees C. Aluminium incorporation in C-S-H depends on the total amount of aluminium present in the sample. At low Al/Si ratio (

This paper investigates the applicability of nucleation and growth mechanisms to the hydration of alite. Various possible mechanisms of nucleation and growth were simulated using the recently-developed microstructural modelling platform mu ic. Comparison w ...

Supplementary cementitious materials (SCM) are known to reduce or even stop expansion due to alkali silica reaction (ASR) in concretes with reactive aggregates. Studies indicate that the main reason for this is the decrease in alkalinity of the pore soluti ...

Karen Scrivener

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Chloride Transport Behavior of LC3 Binders

Low Carbon Cement LC3 in Cuba: Ways to Achieve a Sustainable Growth of Cement Production in Emerging Economies

Effect of alkali hydroxide on calcium silicate hydrate (C-S-H)

On the relevance of volume increase for the length changes of mortar bars in sulfate solutions

Limestone reaction in calcium aluminate cement–calcium sulfate systems

Effect of replacement of silica fume with calcined clay on the hydration and microstructural development of eco-UHPFRC

The Rise of Portland Cements

Eco-efficient cements: Potential economically viable solutions for a low-CO2 cement-based materials industry

Unravelling chloride transport/microstructure relationships for blended-cement pastes with the mini-migration method

Atomic-Level and Surface Structure of Calcium Silicate Hydrate Nanofoils

The Effect of Limestone on the Performance of Ternary Blended Cement LC3: Limestone, Calcined Clays and Cement

Equivalency points: Predicting concrete compressive strength evolution in three days

Rapid, Robust, and Relevant (R3) Reactivity Test for Supplementary Cementitious Materials

Importance of microstructural understanding for durable and sustainable concrete

Influence of self heating and Li2SO4 addition on the microstructural development of calcium aluminate cement

μic: A new platform for modelling the hydration of cements

Effect of cement substitution by limestone on the hydration and microstructural development of ultra-high performance concrete (UHPC)

Influence of calcium to silica ratio on aluminium uptake in calcium silicate hydrate

Studying nucleation and growth kinetics of alite hydration using μic

Alkali fixation of C-S-H in blended cement pastes and its relation to alkali silica reaction