Formwork Pressure of Self-Consolidating Concrete in Tall Wall Field Applications

2005 ◽  
Vol 1914 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Fernando Tejeda-Dominguez ◽  
David A. Lange ◽  
Matthew D. D'Ambrosia
Keyword(s):  
Hydrostatic Pressure ◽  
Use Of Self ◽  
Conventional Concrete ◽  
Concrete Material ◽  
Self Consolidating Concrete ◽  
Structural Applications ◽  
Formwork Pressure ◽  
High Column

The growing interest in the use of self-consolidating concrete (SCC) for a wide variety of structural applications has initiated a reexamination of its properties and current construction practices and how they compare with those of conventional concrete. One property of interest is the formwork pressure of SCC and how it relates to that of conventional concrete. This work presents the results for three tall walls (28, 21.7, and 13 ft tall) cast slowly with SCC and a 10.6-ft-high column poured quickly by using the same concrete used in one of the walls. The research demonstrates that the pressure of SCC against the formwork drops quickly just after the concrete material is placed. Measurements from the walls poured slowly show that the maximum recorded pressure falls far below the hydrostatic pressure and is closely related to the pouring rate. The experiments also reveal that the formwork pressure exerted by SCC can be revitalized if the SCC is vibrated, even if stiffening is already in progress.

Effect of wall friction on variation of formwork pressure over time in self-consolidating concrete

2011 ◽  
Vol 41 (1) ◽  
pp. 90-101 ◽  
Author(s):  
Seung Hee Kwon ◽  
Quoc Tri Phung ◽  
Hong Yong Park ◽  
Jae Hong Kim ◽  
Surendra P. Shah
Keyword(s):  
Wall Friction ◽  
Self Consolidating Concrete ◽  
Formwork Pressure ◽  
Over Time

Study on the Structural Properties of Steel Reinforced CRC Beam-Cracking Resistance

2011 ◽  
Vol 374-377 ◽  
pp. 775-780 ◽  
Author(s):  
Hong Mei Guo ◽  
Han Zhu
Keyword(s):  
Crumb Rubber ◽  
Basic Material ◽  
Cracking Resistance ◽  
Conventional Concrete ◽  
Concrete Material ◽  
Engineering Construction ◽  
Resistant Moment ◽  
Holding Back ◽  
Rubber Concrete ◽  
Good Agreement

In recent years, there has been mounting interest in the use of recyled tire rubbers in engineering construction. Crumb rubber concrete (CRC) is made by adding rubber crumbs into conventional concrete. As a new kind of concrete material of energy saving and environment protecting, CRC has many advantages such as lower Young’s modulus, high damp modulus, large deformation, better depleting energy and perfect ability of holding back crack. The research about it at home and abroad mainly focuses on the basic material properties. But, studies on structural behavior of steel reinforced CRC for structure were seldom reported. This paper, based on the existing experiments, analyzed the cracking resistance of steel reinforced CRC beam under static load, and deduced a new crack-resistant moment formula. The calculating results using this formula have good agreement with the experimental results obtained by other researchers. The study shows that the steel reinforced CRC can effectively improve the cracking resistance of structure.

Formwork Pressure Model for Self-Consolidating Concrete Using a Pressure Decay Signature

2018 ◽  
Vol 115 (3) ◽  
Author(s):  
Jacob D. Henschen ◽  
Daniel I. Castaneda ◽  
David A. Lange
Keyword(s):  
Self Consolidating Concrete ◽  
Pressure Decay ◽  
Formwork Pressure

scholarly journals Analysis of The Mechanical Properties of Concrete Based on Fly Ash and Palm Oil Clinkers

2021 ◽  
Vol 1 (4) ◽  
pp. 31-35
Author(s):  
L Opirina ◽  
Azwanda Azwanda ◽  
R Febrianto
Keyword(s):  
Fly Ash ◽  
Palm Oil ◽  
Strength Test ◽  
Fine Aggregate ◽  
Concrete Composition ◽  
Conventional Concrete ◽  
Concrete Material ◽  
Compressive Strength Test ◽  
Concrete Mix ◽  
Main Material

Concrete is the result of a mixture of cement, aggregate and water. Under certain conditions, the concrete mixture can be added with additives and admixture to get the concrete as needed. Cement is the most important material in the manufacture of conventional concrete. When cement is produced, the same amount of CO2 will also be generated as a side effect and pollute the atmosphere. Fly ash as an alternative to cement will be introduced as an alternative concrete material to reduce the use of cement in the concrete mix. In addition to the use of charcoal fly ash as a partial substitute for cement, this study also uses palm oil clinkers as a substitute for fine aggregate as much as 20%. This replacement material is an industrial waste which has the main content of silica and alumina which is similar to the main material for forming concrete. In addition, the use of these two materials also aims to reduce the exploration of the use of natural materials. This research introduces 3 kinds of concrete composition. The grouping is based on the ratio of fly ash and cement used, namely (60%:40%), (70%:30%) and (80%:20%). The test object used is a concrete cylinder with a diameter of 150 mm and a height of 300 mm. Tests were carried out at the age of 28 days of concrete. The compressive strength test showed that the best concrete was produced from the combination of the addition of 60% fly ash of coal aged 28 days, which was 4.21 MPa.

scholarly journals Evaluation of Self-Consolidating Concrete Robustness by Measuring Electrical Conductivity of Plastic Concrete

2018 ◽  
Author(s):  
Payam Vosoughi ◽  
Mahmoud Motahari Karein
Keyword(s):  
Electrical Conductivity ◽  
Setting Time ◽  
Test Methods ◽  
Test Method ◽  
Fresh Properties ◽  
Conventional Concrete ◽  
Self Consolidating Concrete ◽  
Plastic Concrete ◽  
Cement Based Materials ◽  
Long Time

This paper is aimed to review robustness of Self-Consolidating Concrete (SCC) in term of resistance against static segregation and bleeding. SCC is a highly fluid and non-segregating concrete able to spread through even dense reinforcement and homogenously fill formwork without using any external mechanical consolidation. Due to field requirements, SCC should be able to sustain its desired fresh properties over a relatively long time (about two or three hours) making it more susceptible to segregation than conventional concrete. Although there are a coupleof proposed test methods to evaluate SCC robustness, multi-electrodes electrical conductivity technique could be a reliable, non-destructive, inexpensive and simple test method to continuously monitor progress of hydration reactions (even indicating initial and final setting time) and stability (bleeding and both static and dynamic aggregate segregation) of plastic cement-based materials over the early-age period. In this paper, a brief review on fresh properties of SCC and staticaggregate segregation has been taken place. Then, different methods for measuring concrete conductivity have been investigated. Afterward, some studies on evaluation of stability of cement-based materials and SCC have been reviewed. Finally, based on the literature, some recommendations for future works are introduced.

Study on Strength Properties of Pervious Concrete by Partial Replacement of Cement with Fly Ash

2021 ◽  
Vol 9 (9) ◽  
pp. 1211-1227
Author(s):  
Wasiq Maqbool Peer
Keyword(s):  
Fly Ash ◽  
Green Building ◽  
Strength Properties ◽  
Raw Material ◽  
Pervious Concrete ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Conventional Concrete ◽  
Natural Choice ◽  
Structural Applications

Abstract: Pervious concrete is a concrete containing little or no fine aggregate; it consists of coarse aggregate and cement paste. It seems pervious concrete would be a natural choice for use in structural applications in this age of ‘green building’. It consumes less raw material than normal concrete (no sand), it provides superior insulation values when used in walls, and through the direct drainage of rainwater, it helps recharge groundwater in pavement applications. Due to increase in construction and demolition activities all over the world, the waste concrete after the destruction is not used for any purpose which leads to loss of economy of the country. India is a developing country where urbanization is increasing rapidly which in turn leading to increase of drainage facilities. Pervious concrete helps to allow the water flow into the ground due to interconnected pores. Natural aggregate is becoming scarce, production and shipment is becoming more difficult. In order to overcome this problem, there is need to find a by-product, which can be used to replace the aggregate in conventional concrete mix. Keywords: Pervious Concrete, Partial Replacement, Fly Ash, Cement, Compressive Strength,

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