Research and Development

Cerib Research and Development initiatives are aligned with the principles of both immediate support for precast concrete product manufacturers, through short-term studies, and anticipation of future requirements through medium and long-term research into construction solutions and the associated resources. Some of this work involves inventorying the state of the art, both in France and internationally, and is supported in this by our internal intelligence endeavours.

Cerib Research and Development is divided into 5 fields:
sustainable development
fire and fire-safety engineering (FSE)
concrete technology
structural design
standardization and certification

 

Topics

Research programmes conducted as part of doctoral studies illustrate the long-term commitment to research that involves public-sector bodies such as universities, laboratories, etc., and private-sector bodies (the precast concrete products industry in particular).

The 2016 programme consists of 64 Research and Development studies, 22 of which are new, and are divided into 5 topics.

Sustainable development (green concretes, durability, energy efficiency, environment) – 19 studies; 7 are new

– Concrete recycling – National RECYBETON project and national research agency (ANR) ECOREB project
– Development of precast concrete products based on agro-sourced by-products
– Optimized of the hardening of concretes made with binary and ternary blended cements
– Solutions for accelerating the hardening of binders based on blast-furnace slab: optimization and durability (new study)
– National PerfDub project – Performance-based approach to the durability of concrete structures – ANR MODEVIE project – Modelling ot the ageing of concrete structures
– Interoperability of electronic tags cast into precast concrete products
– Chemical attack – Complement to guidelines for choosing exposure classes
– Protecting buildings against termite infestation – Solutions of the precast concrete products industry (new study)
– Effect of the protection crawl spaces provide with respect to the risk of reinforcement corrosion in coastal zones (new study)
– Adjustment of concrete cover in accordance with the durability performance of concretes (new study)
– Evolution of the hygrothermal performance of building floors/walls
– Heavy partitions and upper floors in housing
– Performance of concrete solutions in thermal-performance calculation software
– Improving the representativity of calculation of the thermal performance of floors (new study)
– Program for calculating the environmental impact of precast concrete building framing
– Contribution of precast concrete products to the environmental performance of buildings
– Creation and updating of EPDs for the precast concrete industry (new study)
– Contribution of blockwork to the environmental performance of houses (new study)

Etudes et Recherches du Cerib - Développement durable

 

Concrete technology – 6 studies; 1 is new

– Acoustic vibration of concrete
– Optimization of mix design of semi-dry concrete for block-making
– Optimization of certain characteristics of masonry units
– Facilitating use of very-high-performance concretes in precasting
– Permanent wall forms: properties resulting from core concretes
– Intensely black concrete slab (new study)

Etudes et Recherches du Cerib - Technologie du béton

Fire / FSE – 10 studies; 2 are new

– Consideration of continuity in the fire design of floors using floor plates
– Fire-break performance of smoke-exhaust and ventilation ducts
– Travelling Fires: Relevance of this fire models for large compartments
– Fire resistance of tall non-loadbearing masonry walls
– Determining fire design scenarios for different building types (new study)
– Fire performance of masonry walls
– Method for taking account of membrane effect in floors
– Fire propagation on insulated sandwich-panel façades
– Parametering of a digital model for assessing the fire performance of non-loadbearing solid panels
– FSE study : effect of aggregate on fire behaviour (new study)

Etudes et Recherches du Cerib - Feu & ISI

 

Standardization – Certification – Quality Management – 6 studies; 3 are new

– Cracking of floorplate joints – Identification of first-order parameters for preventing disorders
– Recommendations for preventing internal sulphate attack – Test programme
– Determining the performance of drainage channels, bearing potential normative changes in mind
– Slip resistance of walking surfaces and stairs (new study)
– Non-destructive measurement methods (new study)
– Drafting of standard NF DTU 23.5 (Block and beam floor systems) (new study)

Etudes et Recherches du Cerib - Essai de glissance

 

Structural design – 23 studies; 9 are new

– Acoustic performance and durability of noise barriers
– Low-frequency acoustic performance of concrete walls/floors
– Acoustic performance of concrete stairs
– Effects of taking account of transverse vehicle impact in Eurocode-based design of bridge superstructures with pretensioned precast beams
– Damping factor for dynamic analysis in Eurocode based design of railway bridges with pretensioned precast beams
– Protocol for measurement of transfer length in prestressed elements
– Evaluation of the shear resistance of floor systems with lattice joists
– Shear resistance of hollow-core slabs with topping
– Acoustic performance of floor systems using floor plates
– Effect of lattice-girder stiffeners on deformation of floors (new study)
– Acoustic performances of concrete blocks (new study)
– Database of the mechanical characteristics of concrete blockwork (new study)
– Design of floor systems subject to mechanical action due to thermal gradients (new study)
– Characterization of lifting eyes in precast beams (new study)
– Performance of coatings on concrete-block masonry
– Mechanical characterization of unfinished (no concrete core) walls made with permanent forms
– Best-practice guidelines for masonry walls using concrete blocks
– Measurement and characterization of the thermal performance of masonry
– Verification of block and beam floor systems under seismic loading
– Soil-retaining function of permanent wall forms for temporary works (new study)
– Study of punching shear in floorplate floor systems (new study)
– Justifications for using a visco-elastic material in pinned joints in seismic zones (new study)
– Clarification of standard NF EN 1992-1-1 with respect to precast concrete products (new study)

Etudes et Recherches du Cerib - Dimensionnement des structures

 

Competitive intelligence – 1 new study

– Circular economy: Issues and opportunities for the precast concrete industry (new study)

 

BIM Building (Building Information Modelling) technology is also a part of the programme, with the objective of building a database of precast concrete products and systems which can subsequently be shared.

AFAQ ISO 9001 Etudes et Recherches du Cerib

Design normal weight shuttering blocks masonry

03/13/2017
réf. 387.E
By Lionel Monfront, Matthieu Scalliet, Nader Lachiheb

Design normal weight shuttering blocks masonry In July 2012, an amendment to the DTU 20.1 (French standards for execution of Masonry) was publish…

Keywords: block masonry, design, Eurocode, horizontal loading, shuttering block, vertical loading

Thermal gradients in uninsulated top floor

03/13/2017
réf. 399.E
By Alkistis Plessis-Moutafidou, Caroline Morin, Iuliana Stoian, Julien Parc

Thermal gradients in uninsulated top floor Concrete top floors can be subjected to high temperature gradients due to sunshine. This applies to un…


Modular precast concrete products for surface runoff infiltration structures

02/01/2017
réf. 353.E-v2
By Jennifer Faleyeux

Modular precast concrete products for surface runoff infiltration structures: technical specifications Facing the lack of specific recommendations on…

Keywords: Concrete pavers, infiltration, Permeability, Permeable pavement, Porous pavers, Surface runoff

Concrete block environmental product declaration

01/01/2017
réf. 365.E-v2

Concrete block environmental product declaration - In compliance with the French standard NF EN 15804+A1 and its national addition NF EN 15804/CN Thi…

Keywords: Concrete block, Environmental product declaration, Sustainability

Circular economy – Project crossed valorisation of industrial by-products

12/01/2016
réf. 364.E
By Marjorie Petitpain

Circular economy - Project crossed valorisation of industrial by-products In order to reduce waste at the root and develop recycling and waste repurp…

Keywords: Biomass ashes, Circular economy, Foundry fines, Industrial by-product, Paving product, Slag, valorisation

Durability of concrete products exposed to an aggressive environment for reinforcements

03/20/2016
réf. 347.E
By Jonathan Mai-Nhu, Patrick Rougeau

This study deals with the deterioration mechanisms of concrete linked to the reinforcement corrosion and the development of a predictive model of dura…

Keywords: armatures, carbonatation, Carbonation, Chloride penetration, Concrete product, corrosion, Cover thickness, durabilité, Durability, environnement agressif, Predictive model, produits en béton

Pedestrian accessibility in town : the French legislation, regulation and standardization

02/20/2016
réf. 271.E-V2
By Grégoire Wernert, Thibaut Le Doeuff

Everyone expects to go around town by himself easily. Since 2005, the French legislation, regulation ant standardization have improved in order to mak…

Keywords: Accessibility, Concrete product, Legislation, Public space, Regulation, Standardization, Street

Acceleration of the hardening of blast furnace slag based binders for precast concrete products

12/20/2015
réf. 354.E
By François Jacquemot

The reported study aims to propose industrially viable solutions in order to accelerate the hardening of ground granulated blast furnace slag in preca…

Keywords: Blast furnace slag, durabilité, Durability, Hardening

Reinforcement corrosion : interest of corrosion inhibitors and methodology for monitoring concrete structures

12/20/2015
réf. 276.E
By Jonathan Mai-Nhu

For most of the precast products, reinforcement corrosion is one of the main decisive phenomena for the lifetime of the structure. Delaying the appari…

Keywords: Chlorides, corrosion, durabilité, Durability, maintenance, Reinforcement, Sensor

Numerical analysis of structures with Block-and-beam floors and thermal breaks

12/16/2015
réf. 362.E
By Armand Leroux, Matthieu Scalliet

It can be necessary to model with finite elements the global buildings to justify their resistance to seismic loading. This report deals with the case…

Keywords: Block-and-beam floor, Modeling, Seismic loading, Thermal break