Foundations of civil and environment al engineering

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ISBN/ISSN:

1642-9303

DOI:

Wydawnictwo:

Wydawnictwo Politechniki Poznańskiej

Rok wydania:

2006

Liczba stron:

424

XML:ISBN/ISSN:

ONIX MARC21

Bibliografia:

Praca zbiorowa. Foundations of civil and environment al engineering. Red. . : Wydawnictwo Politechniki Poznańskiej, 2006, 424 s. ISSN 1642-9303

Bibliografia refWorks:

RT Book, Whole

SR Electronic(1)

A1 Praca zbiorowa

T1 Foundations of civil and environment al engineering

PB Wydawnictwo Politechniki Poznańskiej

YR 2006

Bibliografia BibTex:

@Book{ 206426, author = "Praca zbiorowa", editor = "", title = "Foundations of civil and environment al engineering", publisher = "Wydawnictwo Politechniki Poznańskiej", year = "2006", address = "", issn = "1642-9303" }

Bibliografia endNote:

TY - BOOK

AU - Praca zbiorowa

ED -

TI - Foundations of civil and environment al engineering

PB - Wydawnictwo Politechniki Poznańskiej

CY -

PY - 2006

ER -

Netografia (standard APA):

Praca zbiorowa. Foundations of civil and environment al engineering [baza danych online] : Wydawnictwo Politechniki Poznańskiej, 2006 [dostęp: 25 08 2024]. Dostęp w Ibuk Libra: https://libra.ibuk.pl/reader/foundations-of-civil-and-environment-al-engineering-praca-zbiorowa-206426.

concrete, concrete structures, controlled permeability formwork, durability of concrete, properties of concrete surface

The durability of concrete structures is commonly considered in all domains of building activity. One of the promising methods for the durability improvement of con-crete surface is application of controlled permeability formwork (CPF). Nowadays, ...

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ISBN/ISSN:

1642-9303

DOI:

Wydawnictwo:

Wydawnictwo Politechniki Poznańskiej

Rok wydania:

2006

Liczba stron:

424

XML:ISBN/ISSN:

ONIX MARC21

Andrzej AJDUKIEWICZ On durability aspects of concrete members formed against permeable formwork7
Carlo CINQUINI, Matteo BRUGGI On the use of mixed finite elements in topology optimization17
Sélim DATOUSSAID, Guy GUERLEMENT, Thierry DESCAMPS Applications of evolutionary strategies to optimal design of mechanical systems35
Krzysztof DEMS, Jacek WIŚNIEWSKI Design of fibre layout in multilayer composite using hybrid algorithms53
Wojciech DORNOWSKI, Piotr PERZYNA Numerical investigation of localized fracture phenomena in inelastic solids79
József FARKAS, Károly JÁRMAI Distortions and decrease of load-carrying capacity of welded structures due to residual welding stresses117
Adam GLEMA Physical and numerical aspects of dispersion phenomenon in solids under impact loading127
Jan GRABACKI,Iwona JURCZAK-BROSZKO, On geometry of porous medium147
GREEN,Radoslaw L. MICHAŁOWSKI Shear band formation behind a retaining structures subjected to seismic excitation157
Michał GUMINIAK, Ryszard SYGULSKI Initial stability of Kirchhoff plates by the boundary element method using a modified formulation of a boundary condition 171- Tomasz JANKOWIAK, Janusz KLEPACZKO, Tomasz ŁODYGOWSKI Numerical modeling of wave propagation and interaction in bars187
Daniel LAMBLIN, Laurent VAN PARYS, Thierry DESCAMPS A simplified numerical approach of arches affected by horizontal spring displacements201
Tomasz LEWIŃSKI On the fundamental problem of opti mum design of anisotropic plates215
Zenon MRÓZ, Dariusz BOJCZUK Topological sensitivity derivative: application in optimal design and material science229
Udo NACKENHORST Computational methods for studies on the biomechanics of bones251
Pauli PEDERSEN, Niels L. PEDERSEN On modeling and optimal design of beambridge structures273
Anna STANKIEWICZ, Jerzy PAMIN Gradient-enhanced Cam-clay model in simulation of strain localization in soil293
Erwin STEIN, Franz Otto KOPP, Karin WIECHMANN, Gerhard WEBER Calculemus! New research results and functional models regarding Leibniz four function calculating machine and binary calculating machine319
Czesław SZYMCZAK The effect of nonlinear restraint on torsional buckling and post-buckling behaviour of a thin-walled column333
Zenon WASZCZYSZYN, Marek SŁOŃSKI Bayesian neutral networks for prediction of response spectra343
Marcin WIERSZYCKI, Witold KĄKOL, Tomasz ŁODYGOWSKI Fatigue algorithm for dental implant363
Janusz WOJTKOWIAK, Czesław OLEŚKOWICZ-POPIEL Investigations of butterfly control valve flow characteristics381
Peter WRIGGERS, Kishor CHAVAN Beam and shell elements for thin-walled aluminium structures397
Krzysztof ZIOPAJA, Zbigniew POZORSKI Damage detection and estimation using wevelet transform413

Ondurabilityaspectsofconcretemembersformedagainstpermeableformwork

3.TESTRESULTSOFCONCRETEPROPERTIESATSURFACE

Thereductionofw/cratioinskinlayerofconcreteresultsinmanybene-

fits.Allofthemareimportantfromthedurabilitypointofview.Recentinvesti-

gationsweredoneusingdifferentspecimens,andfirstofall–differentconcrete

mixtures.Inthemajorityofcases,theconcretegradesfromC20/25toC40/45

weretested,withbasicw/cratiointherangeof0,40to0,60.

Ingeneral,thefollowingimprovementsofconcretepropertiesatsurface

wereobtainedbymeansofusingCPFincomparisontoclassicimpermeable

formwok(accordingto[10]):

•increaseofcompressiveconcretestrengthmeasuredonthesurfacewith

sclerometerfrom25to40%,

•increaseoftensilestrengthatsurface(pull-offmethod)from40to60%,

•reductionofw/cratioatsurfacefrom30to50%,

•decreaseofporosityupto30%,intherangeofgreaterporesmainly,

•decreaseofthedepthofcarbonation(inthetestofacceleratedcarbonation

underCO2pressure)from70to100%,

•decreaseofchloridediffusioncoefficientfrom50to70%,

•decreaseofabrasioncoefficient(Böhme’smethod)from30to70%,

•resistancetofreezingandtowing(RILEMtest):twentyormoretimeslessthe

weightloss.

SomeselectedresultsforconcretemixturesdescribedinTable1arepre-

sentedinFig.3onthebasisofourowntests’resultsandpresentedbyBarnewold

[8].Allthesetestsweredoneinasimilarway.Thecorespecimensweretaken

fromwalls300mmthick,formedagainstCPFononeside,andagainstplywood

ontheother.Therefore,eachcylindricalspecimenhaddifferentsurfacesonboth

bases,butitsconcretewasexactlythesame(noeffectsofcastinginthevertical

position).

Table1.Concretemixturesusedindurabilitytests

Concreteclassdesigned

Cementtype

Cement,kg/m

Fly-ash(fa),kg/m

Plasticizer(dry),kg/m

Water,kg/m

Aggregate(total),kg/m

Ratiow/(c+fa)

Compressivemean

strengthfcm,28,MPa

CEMI

C20/25

1765

32,5

0,60

31,4

335

201

C30/37

CEMI

42,5R

1845

0,51

40,4

280

175

0,5

C35/45

CEMI

42,5R

1805

47,1

0,47

350

180

0,6

CEMIIIB

C30/37h

1870

32,5

0,50

40,7

340

170

0,3

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