scholarly journals Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

2018 ◽  
Vol 4 (5) ◽  
pp. 971 ◽  
Author(s):  
T. Chandra Sekhara Reddy Reddy ◽  
A Ravitheja Theja ◽  
C. Sashidhar
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Water Immersion ◽  
High Strength ◽  
Sem Analysis ◽  
Partial Replacement ◽  
Self Healing ◽  
Fibre Reinforced Concrete ◽  
Water Contact ◽  
Air Exposure

The aim of this study is to analyse the self-healing capability of high-strength fibre-reinforced concrete (M70) with fly ash and crystalline admixture (CA) in four types of environmental exposures i.e. Water Immersion (WI), Wet-Dry Cycles (WD), Water contact (WC) and Air Exposure (AE). Specimens for four mixes are cast, one mix containing 1.1% of CA and three mixes with 10%, 20% and 30% partial replacement of cement with fly ash and additions of 1.1% CA. The specimens were pre-cracked at 28 days, in the range of 0.10-0.40 mm and the time set for healing was 42 days. The result shows that all the mixes have considerable amount of closing ability and strength-regaining capability for all exposure conditions. The concrete with 20% fly ash and 1.1% CA has complete crack closing ability and 100% strength-regaining capability for WI and WD cycle conditions. From SEM analysis, it is confirmed that self-healing products are CaCO3 and C-S-H gel.

scholarly journals PROPERTIES OF FRESH POLYPROPYLENE FIBRE REINFORCED CONCRETE UNDER THE INFLUENCE OF POZZOLANS

2003 ◽  
Vol 9 (4) ◽  
pp. 271-279 ◽  
Author(s):  
Hau-yan Leung ◽  
Ramapillai V. Balendran
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Silica Fume ◽  
Setting Time ◽  
Polypropylene Fibre ◽  
Partial Replacement ◽  
Fibre Reinforced Concrete ◽  
Polypropylene Fibres ◽  
Fibre Concrete ◽  
Time Substitution

This paper summarises experimental results of some fresh concrete tests. Polypropylene fibres were added to the concrete mix to produce fibre reinforced concrete. Pozzolanic materials, including pulverised fly ash and silica fume, were used as partial replacement of cement, and their effects on the fresh fibre concrete were reported. Test results showed that the polypropylene fibre reduced the concrete workability significantly by thixotropic effect and decreased the setting time. Substitution of pozzolans also greatly affected the properties. The presence of fly ash increased the workability and setting time but in the presence of silica fume a reverse trend was observed. Empirical equations were proposed.

scholarly journals RESONANT FREQUENCY IN POLYPROPYLENE FIBRE REINFORCED CONCRETE (PFRC) WITH POZZOLANIC MATERIALS

2002 ◽  
Vol 8 (3) ◽  
pp. 169-176
Author(s):  
Hau Y. Leung ◽  
Ramapillai V. Balendran
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Resonant Frequency ◽  
Silica Fume ◽  
Polypropylene Fibre ◽  
Partial Replacement ◽  
Fibre Reinforced Concrete ◽  
Polypropylene Fibres ◽  
Curing Conditions ◽  
Curing Condition

In this study, the resonant frequency of polypropylene fibre reinforced concrete (PFRC) under three different curing conditions was investigated and the influences of fly ash (PFA) and silica fume (SF) on PFRC under the same curing condition were also studied. The experiments were carried out in the Heavy Laboratory of City University of Hong Kong. Four types of concrete mixes were tested. A total of 24 concrete specimens were prepared. Test results show that the resonant frequency can be affected by the presence of polypropylene fibres, partial replacement of cement by silica fume or pulverized fly ash, and curing condition.

scholarly journals Drying Shrinkage Behaviour of Fibre Reinforced Concrete Incorporating Polyvinyl Alcohol Fibres and Fly Ash

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Amin Noushini ◽  
Kirk Vessalas ◽  
Garo Arabian ◽  
Bijan Samali
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Polyvinyl Alcohol ◽  
Drying Shrinkage ◽  
Length Change ◽  
Partial Replacement ◽  
Fibre Reinforced Concrete ◽  
Shrinkage Behaviour ◽  
Alcohol Fibre ◽  
And Control

The current study assesses the drying shrinkage behaviour of polyvinyl alcohol fibre reinforced concrete (PVA-FRC) containing short-length (6 mm) and long-length (12 mm) uncoated monofilament PVA fibres at 0.125%, 0.25%, 0.375%, and 0.5% volumetric fractions. Fly ash is also used as a partial replacement of Portland cement in all mixes. PVA-FRC mixes have been compared to length change of control concrete (devoid of fibres) at 3 storage intervals: early-age (0–7 days), short-term (0–28 days), and long-term (28–112 days) intervals. The shrinkage results of FRC and control concrete up to 112 days indicated that all PVA-FRC mixes exhibited higher drying shrinkage than control. The shrinkage exhibited by PVA-FRC mixes ranged from 449 to 480 microstrain, where this value was only 427 microstrain in the case of control. In addition, the longer fibres exhibited higher mass loss, thus potentially contributing to higher shrinkage.

Properties of High Strength Fibre Reinforced Concrete Using Ultra Fine Slag

2016 ◽  
Vol 857 ◽  
pp. 183-188
Author(s):  
C. Mohan Lal ◽  
Vontary Sai Srujan Reddy
Keyword(s):  
High Strength Concrete ◽  
Steel Fibre ◽  
High Strength ◽  
Target Strength ◽  
Partial Replacement ◽  
Fibre Reinforced Concrete ◽  
Test Results ◽  
Design Requirement ◽  
Split Tensile Strength ◽  
Strength Concrete

High strength concrete has become a design requirement in recent years due to increase in number of infrastructure projects. This paper presents the effect of incorporating Ultra Fine Slag (UFS) and steel fibre to obtain high strength concrete. To achieve target strength of about 80 MPa, it is proposed to the replacement of cement of 10%, 20% and 30% with UFS and incorporating 0.5% and 1.0% fibre in concrete. An experimental investigation is carried out to find the mechanical properties of the concrete. From the test results, it was observed that a compressive strength of 95 MPa was achieved at 30% replacement of cement with UFS and 1.0% fibre content. In addition, there was a significant improvement in split tensile strength and flexural strength of the concrete. This study demonstrates that a high strength concrete can be obtained from partial replacement of cement with UFS and addition of steel fibre.

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