A Review of self compacting concrete

“Effect of extreme weather condition curing on self compacting concrete- A Review”

SONANI DHVANIKUMAR D.M.E. STRUCTURAL ENGINEERING

B.V.M. engineering college

DR. DARSHANA R. BHATTAssociate professor,

Department of structural engineering

BVM engineering college, VVN

PROF. NANAK J. PAMNANI Principal,

H.B.Patel polytechnic,Limbodara,

Lunawada, (dist. mahisagar)

A Review Paper on

Introduction

Need for study

Literature review

Salient features from literature review

Objectives of study

Content :

Introduction :

What is Self compacting concrete ? Self-compacting concrete (SCC), which

flows under its own weight and does not require

any external vibration for compaction, has

revolutionized concrete placement.

SCC, was first introduced in the late 1980’s

by Japanese researchers, is highly workable

concrete that can flow under its own weight

through restricted sections without segregation

and bleeding.

Curing of concrete is the process of maintaining the

proper moisture conditions to promote optimum cement

hydration immediately after placement.

Proper moisture conditions are critical because water is

necessary for the hydration of cementations materials.

Curing techniques and curing duration significantly affect

curing efficiency.

Curing :

In general, a newly placed concrete is compacted by vibrating

equipment to remove the entrapped air, thus making it dense and

homogeneous.

Compaction is the key for producing good concrete with optimum

strength and durability. While we use admixtures in concrete it helps in

elimination of internal segregation between solid particles.

Improper compaction on construction site.

Scarcity of available labor.

Need for study :

Insufficient curing at construction sites.

Lesser durability of concrete due to insufficient compaction and curing.

Complex shape of concrete structures and densely

arranged bars make it more difficult to use a vibrator.

Vibratory compaction is noisy and deleterious to the

health of construction workers, as well as an

annoyance to people in the neighbourhood.

In remote areas it is difficult to find skilled workers to

carry out the compacting work at construction sites

Literature Review :

EFNARC, UK, 2002.

The EFNARC Specification defines specific requirements for

the SCC materialits composition and its application.Workability test methods.

“Specification and Guidelines for Self-Compacting Concrete”

EFNARC given the Workability criteria for the fresh SCC.

Method unit

Typical range of values

Minimum Maximum

Slump flow Mm 650 800

T50CM Slump flow Sec 2 5

J-ring Mm 0 10

V-funnel Sec 6 12

L-box H2/h1 0.8 1.0

U-box h2 – h1 0 30

Fill-box % 90 100

“Specification and Guidelines for Self-Compacting Concrete”

N R Gaywala

D B Raijiwala

Journal of Engineering Research and Studies E-ISSN0976-7916

“SELF COMPACTING CONCRETE: A CONCRETE OF NEXTDECADE”

This paper presents the progress of the research on different harden properties of Self Compacting Concrete using the Ordinary Portland Cement and low-calcium fly ash.

The hardened properties like compressive strength, split tensile strength, flexural strength and are found in experimental work and are compared with M25 grade of concrete.

In this work an attempt is made to study the various properties of self compacting concrete when cement is replaced by different proportions of fly ash which can act as a pozzolana.

Its concluded that,

The maximum compressive strength, split tensile strength, flexural strength for self compacting concrete can be obtained by addition of 15% of fly ash in mix as compared to addition of 25%, 35%, 45% and 55% cement replacement by fly ash.

“SELF COMPACTING CONCRETE: A CONCRETE OF NEXT DECADE”

Michael Stegmaier

Otto-Graf-Journal 183 Vol. 16, 2005

“HEAT CURING OF SELF-COMPACTING CONCRETE (SCC)”

In these study, the compressive strength, the splitting tensile strength and the static Young’s modulus were determined and compared to reference concretes that had been stored for 3 days under standard conditions.

The viscosity-agent type shows analogously to the compressive strength a continuous decrease in splitting tensile strength with rising curing temperature and achieves at 80 °C only approx. 60 % of the splitting tensile strength of the standard storage.

For the splitting tensile strength, heat curing temperatures up to 60 °C can be regarded as uncritical. Beyond this temperature, strength losses compared to standard storage have to be reckoned with.

HEAT CURING OF SELF-COMPACTING CONCRETE (SCC)”

E.M. Mbadikea,

A.U. Elinwab

Nigerian Journal of Technology Vol. 30, No. 2, June 2011.

“EFFECT OF SALT WATER IN THE PRODUCTIONOF CONCRETE”

In this paper, the flexural strength was determined using a beam mould of 150×150×600mm in dimension. The total number of beams cast was ninety. forty five beams using salt water and forty five beams using fresh water.

He concluded that,

The strength development in the concrete produced increases with the increase in the hydration period.

The use of salt water in concrete production will reduce the strength of concrete produced to approximately 8%.

“EFFECT OF SALT WATER IN THE PRODUCTION OF CONCRETE”

Md. Moinul Islam,

Md. Saiful Islam,

Md. Al-Amin

Md. Mydul Islam

Journal of Civil Engineering (IEB), 40 (1) (2012) 37-45

“Suitability of sea water on curing and compressivestrength of structural concrete”

it is economical to use sea water that is available near the construction site instead of plain water to be transported from other areas/sources.

But sea water contains large amounts of sea salts, which may have adverse effect on the properties of concrete.

So it is required to investigate the effect of sea salts on strength properties of different types of concrete while using sea water for casting and curing of concrete.

“Suitability of sea water on curing and compressive strength of structural concrete”

the ratio of compressive strength for 180 days and 7 days is equal to 1.87 for concrete made and cured with plain water

whereas this value is 1.83 for plain water mixed and sea water cured concrete.

variable studied and test conducted,

• Concrete specimens made with plain water and cured in sea water showed a loss in strength of around 6%.

Sea water affects the gain in strength of concrete when used for mixing and curing. It increases the early strength gaining but ultimately the strength decreases..

“Suitability of sea water on curing and compressive strength of structural concrete”

SCC is to be achieved by adjusting the water /powder ratio and super plasticizer dosage.

Longer curing time improves the hydration process resulting in higher compressive strength

For splitting tensile strength, heat curing temperatures up to 60 °C can be regarded as uncritical.

The splitting cylinder strength increases when increasing the super-plasticizer doses.

Concrete specimens made with plain water and cured in sea water showed a loss in strength of around 6%

SALIENT FEATURES:

Finalization of appropriate superplastisizer and its optimum dosage.

Development of mix design for medium strength SCC.

Effect of selected weather condition curing on mechanical properties (Compressive strength, tensile strength, flexural strength, moe ) on SCC.

Comparision between strength of various weather curing conditions ( hot curing , cold curing , salt curing ).

Study and identify effective method of extreme weather condition curing.

OBJECTIVES:

Akinsola Olufemi Emmanue, Fatokun Ajibola Oladipo, “Investigation of Salinity Effect on Compressive Strength of Reinforced Concrete”, Journal of Sustainable Development; Vol. 5, No. 6; 2012

ACI Committee 306, Cold-Weather Concreting, ACI 306R-88, Reapproved 1997, American Concrete Institute, Farmington Hills, Michigan, 1997, 23 pages.

Chapter 12 “Curing Concrete”, University of Memphis http://www.ce.memphis.edu/1101/notes/concrete/PCA_manual/Chap12.pdf

E.M. Mbadikea, A.U. Elinwab, “effect of salt water in the production of concrete”, Nigerian Journal of Technology, Vol. 30, No. 2. June 2011.

EFNARC, Specification and guidelines for self-compacting concrete. UK, 2002. pp.32, ISBN 0953973344.

Fareed ahmed memon, muhd fadhil nuruddin “effect of curing conditions on strength of fly ash-based self-compacting geopolymer concrete” , international journal of civil and environmental engineering 3:3 2011

Referances:

Tao, J., Yuan, Y., and Taerwe, L. (2010). ”Compressive Strength of Self-Compacting Concrete during High-Temperature Exposure.”J. Mater. Civ. Eng., 22(10), 1005–1011.

Michael Stegmaier, “heat curing of self-compacting concrete (SCC)” Otto-Graf-Journal 183 Vol. 16, 2005

Md. Moinul Islam, Md. Saiful Islam, Md. Al-Amin and Md. Mydul Islam, “Suitability of sea water on curing and compressive strength of structural concrete” , Journal of Civil Engineering (IEB), 40 (1) (2012) 37-45.

Mohammed Wael Abu Shaban, “Fresh and Hardened Properties of Ultra High Performance Self Compacting Concrete” The Islamic University Gaza Higher Education Deanship Faculty of Engineering Civil Engineering Department.

N R Gaywala, D B Raijiwala, “self-compacting concrete: a concrete of next decade”, Journal of Engineering Research and Studies, E-ISSN0976-7916.

Okamura H., Ozawa K., Mix Design for Self-Compacting Concrete, Concrete Library of Japanese Society of Civil Engineers, June 25, 1995, p. 107-120.

Rashida A Jhumarwala, P. S. Rao, T. N. Patel, “Experimental Investigation on Self-Compacting Geopolymer Concrete (SCGC)” indian journal of research.

Xiaolu Guo, Huisheng Shi, Warren A. Dick, “Compressive strength and microstructural characteristics of class C fly ash geopolymer”, Cement & Concrete Composites, 32 (2010), pp. 142-147.

THANK YOU…