NDLI: Performance of sewer pipe concrete mixtures with portland and calcium aluminate cements subject to mineral and biogenic acid attack

Content Provider	Springer Nature Link
Author	Alexander, M. G. Fourie, C.
Copyright Year	2010
Abstract	The paper reports on the performance of a series of sewer pipe concrete mixtures and cementitious lining mixtures in acid environments. Binder types based on ordinary portland cement (OPC) and calcium aluminate cement (CAC) were used, with both acid-soluble and acid-insoluble aggregates and various supplementary cementitious materials (SCM). One series of tests subjected the mixtures to pure mineral acid (hydrochloric acid, pH = 1), using a specially designed dynamic test rig. The other series of tests involved monitoring specimens placed in a live sewer under very aggressive conditions induced by acid-generating bacteria. Under mineral acid attack on concretes with conventional dolomite aggregates, OPC/silica fume concretes displayed best performance, attributed to their densified microstructure coupled with substantially improved ITZ. CAC concretes with dolomite aggregate did not perform any better than similar OPC specimens under these conditions, primarily because of their higher porosity. However, with concretes using synthetic alag$^{TM}$ aggregates in mineral acid testing, CAC/alag$^{TM}$ mixtures performed exceptionally well due to their homogeneous microstructure, inferred absence of an ITZ, and slower dissolution and finer size of alag$^{TM}$ aggregate particles. The dynamic acid test was able to reveal differences in physical and chemical interactions between constituents in concrete mixes. Under biogenic acid conditions in the sewer, CAC concretes clearly outperformed OPC concretes. This is ascribed to the ability of CAC to stifle the metabolism of the acid-generating bacteria, thereby reducing acid generation. Thus the effects of neutralisation capacity and stifling of bacterial activity need to be distinguished in designing concrete mixtures to provide good acid resistance. Relative rates of dissolution of binder and aggregates are also important in overall performance, with uniform rates preferable in order to avoid aggregate fallout.Cet article présente des séries d’essais visant à évaluer la résistance à la corrosion acide de différents bétons et mortiers de protection utilisés pour les tuyaux d’assainissement. Les types de liant sont du Ciment Portland (OPC) et du ciment d’aluminate de calcium (CAC), combinés à des granulats soit solubles dans l’acide soit insolubles, avec ou sans ajouts minéraux (SCM). Dans une première série de tests, les bétons sont soumis à un acide minéral pur (acide chlorydrique, pH = 1) à l’aide d’un montage dynamique spécialement conçu pour ce programme. Une deuxième série d’essais consiste à suivre des éprouvettes exposées dans un réseau d’égout en service, dans des conditions très sévères de corrosion biogénique induites par les bactéries produisant de l’acide. Soumises à la corrosion par l’acide minéral, les éprouvettes de béton OPC/fumée de silice avec des granulats dolomitiques ont montré la meilleure performance, probablement en raison d’une microstructure plus dense et d’une auréole de transition (ITZ) nettement améliorée. Les bétons de CAC avec granulats dolomitiques n’ont pas présenté une meilleure performance par rapport aux bétons de Portland dans cet essai, probablement en raison d’une plus grande porosité. A l’inverse, les bétons de CAC/granulats ALAG$^{TM}$ ont exceptionnellement bien résisté au test à l’acide minéral, en raison à l’homogénéité de la microstructure, de l’absence d’auréole de transition, d’une dissolution plus lente et de la taille réduite des particules de granulats ALAG$^{TM}$. Le test dynamique de résistance à la corrosion acide a permis de mettre en évidence les différences dans les interactions physiques et chimiques entre les constituants des bétons. Dans les conditions de corrosion acide d’origine biogénique en réseau d’assainissement, les bétons de CAC ont clairement mieux tenu que les bétons d’OPC. Cela est attribué à la capacité des CAC de freiner le métabolisme des bactéries produisant de l’acide, réduisant ainsi la production d’acide. En conséquence, les paramètres de capacité de neutralisation et de réduction de l’activité biologique doivent être distingués dans la conception d’une formule de bétons pour obtenir une bonne résistance à la corrosion acide. Les taux relatifs de dissolution du liant et des granulats sont aussi importants dans la performance globale, des taux similaires étant préférable pour éviter le déchaussement des granulats.
Starting Page	313
Ending Page	330
Page Count	18
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	44
Issue Number	1
e-ISSN	18716873
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-06-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Calcium aluminate cement Acid attack Acid resistance Concrete sewer pipes Performance Biogenic Alag$^{TM}$ aggregates Building Materials Civil Engineering Operating Procedures, Materials Treatment Theoretical and Applied Mechanics Materials Science Structural Mechanics
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Modelling of the sulfuric acid attack on different types of cementitious materials

Evaluation of Portland limestone cements for use in concrete construction

NMR relaxometry during internal curing of Portland cements by lightweight aggregates

Impact of rapid-hardening cements on mechanical properties of cement bitumen emulsion asphalt

Influence of the binder on the behaviour of mortars exposed to H$_{2}$S in sewer networks: a long-term durability study

Application of Fourier transform infrared spectroscopy to study concrete degradation induced by biogenic sulfuric acid

Bioreceptivity of Portland and calcium Sulphoaluminate cements in urban sewerage networks

Pore structure and permeability of hardened calcium aluminate cement pastes of low w/c ratio

Reduction of the cement content in mortars made with fine concrete aggregates

Performance of sewer pipe concrete mixtures with portland and calcium aluminate cements subject to mineral and biogenic acid attack

Similar Documents

Modelling of the sulfuric acid attack on different types of cementitious materials

Evaluation of Portland limestone cements for use in concrete construction

NMR relaxometry during internal curing of Portland cements by lightweight aggregates

Impact of rapid-hardening cements on mechanical properties of cement bitumen emulsion asphalt

Influence of the binder on the behaviour of mortars exposed to H$_{2}$S in sewer networks: a long-term durability study

Application of Fourier transform infrared spectroscopy to study concrete degradation induced by biogenic sulfuric acid

Bioreceptivity of Portland and calcium Sulphoaluminate cements in urban sewerage networks

Pore structure and permeability of hardened calcium aluminate cement pastes of low w/c ratio

Reduction of the cement content in mortars made with fine concrete aggregates

Performance of sewer pipe concrete mixtures with portland and calcium aluminate cements subject to mineral and biogenic acid attack