Author: Brenton A. StonePublisher:
ISBN:
Category :
Languages : en
Pages : 560
Book Description
Mix Design Optimization and Characterization of High-performance/high-strength Lightweight Concrete
Author: Brenton A. StoneInvestigation of Mix Design and Properties of High-strength/high-performance Lightweight Concrete
Author: Brandon S. BuchbergPublisher:
ISBN:
Category : Concrete
Languages : en
Pages :
Book Description
Development, Characterization and Performance of Early-high Strength Concrete Mixes for Bonded Concrete Mixes for Bonded Concrete Overlays
Author: Julio Cesar Paniagua FernandezPublisher:
ISBN: 9781369616293
Category :
Languages : en
Pages :
Book Description
Pavement rehabilitation using concrete has been difficult to program because of its long curing time and its initial high cost compared. Road users in California have low tolerance for delays during pavement rehabilitation. The California Department of Transportation (Caltrans) is interested in developing bonded-concrete overlays on asphalt (BCOA) as a potential rehabilitation alternative for distressed asphalt pavement. BCOA is defined herein as jointed plain concrete overlay placed on asphalt pavement with slab thicknesses between 100 to 175 mm, and slabs that are smaller than often used 3.7m lane-width lane. The slabs are intended to function as a bonded concrete overlay meaning that the concrete bonds to the underlying asphalt layer so that they behave as a monolithic layer. In the conception of thin BCOA technology, the asphalt base contributes to the structure’s stiffness by bonding with the PCC slabs to form a composite slab where both layers work together to resist bending. Caltrans specifies a minimum flexural strength of 2.8 MPa (400 psi) for concrete slabs prior to opening to highway traffic. The work done at the University of California Pavement Research Center (UCPRC) presented in this thesis is a part of Caltrans’ sponsored Strategic Plan Element (SPE) 4.58b, which intends to help solve this issue for Caltrans by developing a guide and recommendations on the use of thin BCOA as a rehabilitation alternative in California. This report is focused on evaluating the development, design and performance for the EHSC mixes to be used for BCOA test sections to be subjected to full-scale accelerated pavement testing (APT). Two type of mixes were created according to selected time windows to open to traffic. The concrete mixes for the night closure required an opening time (OT) to traffic of 4 hours which defined in this document as 4H-OT. Meanwhile the mixes for the weekend closure require an OT to traffic of 10 hours, these mixes are defined as 10H-OT. Two mixes were designed for each of the time windows. Portland cement Type III and calcium sulfo-aluminate (CSA) were used to design the 4H-OT mixes. Both 10H-OT mixes used the same portland cement Type II/V and the difference between the two 10H-OT mixes is the use of Light Weight Aggregate (LWA) instead of a portion of conventional sand. The thesis is intended to advance current knowledge by answering questions and explaining concepts such as properties of different cementitious materials, minimum strength requirements, optimization of mixing procedures, prediction of flexural and compressive strength, albedo properties, maturity-based predictions, and performance ranking. In order to achieve that the document include a literature review, an analysis of the main properties of different cement components, a summary of the development of the mix designs, and results and performance analysis for several tests (e.g. flexural strength, compressive strength, modulus of elasticity, maturity, shrinkage, CTE and thermal properties). The research produce a lot of important results, but these are some of the most important: - The flexural strength of the specimens prepared during construction that followed CT 524 curing procedure do not show lower strengths than the results of the ASTM test, in fact the value is within the results of the specimens following ASTM C78.- Type II and III develop the same highest strength at long term, meanwhile, in the short-term CSA mix develops the highest, and faster than the other mixes. Nevertheless, once CSA reaches the peak at a very early stage it remains steady through time.- In compressive strength, the mix with LWA perform well in the long term reaching similar values than the 10-hour mix without LWA. Nevertheless, the long-term performance in flexural strength do not get too close to the 10-hour mix without LWA.- An equation to predict flexural strength was calibrated for each of the four mixes based on tests results conducted on specimens prepared in the laboratory.
Strength Characterization of Lightweight and High Performance Concretes Under Extreme Conditions
Author: Eric John KovolyanPublisher:
ISBN:
Category : Concrete
Languages : en
Pages : 90
Book Description
Mix Development of PLC-based Ultra-high Performance Fibre Reinforced Concrete and Characterization of Key Mechanical Properties and Time-Dependent Behaviour
Author: Bingyue ShaoPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
This thesis proposes a new Ultra-high Performance Fibre Reinforced Concrete (UHPFRC) mix design developed and optimized with the aim of lowering environmental and economic cost while achieving better performance. Instead of plain Portland Cement, the proposed mix uses Portland Limestone Cement (PLC) with 6-15 % of limestone, as a means to reduce the gross cement content. The optimized mix design features 10% of silica fume and 30% of ground granulated blast-furnace slag, 2.5% of steel fibres by the total volume, and very low water-to-binder ratio. The proposed mix is validated and characterized through a comprehensive experimental program, which shows that at 56 days the proposed mix can achieve a compressive strength at least 130 MPa, an average peak flexural stress of 27 MPa, and an average peak uni-axial tensile strength of 10 MPa. Tests also show that the proposed mix has satisfactory performance in shrinkage, resistance of chloride ion penetration, and freeze-thaw resistance.
Dynamic Strength Characterization of High Performance Concrete
Author: Arun ShuklaPublisher:
ISBN:
Category : High strength concrete
Languages : en
Pages : 88
Book Description
Concrete Mix Design, Quality Control and Specification
Author: Ken W. DayPublisher: CRC Press
ISBN: 020312779X
Category : Technology & Engineering
Languages : en
Pages : 340
Book Description
This new edition provides comprehensive, readily understandable assistance to concrete producers in the design and control of their product. It shows how to apply the principles with or without elaborate systems and achieve competitive mix designs and close quality control without either excessive expenditure or extensive theoretical study.
Design, Characterization and Modeling of High Performance Pervious Concrete
Author: Rui ZhongMixture Proportion Optimization of Lightweight Aggregrate Concrete Based on Rheological Characterization
Author: Katherine Louise GustashawPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Considerations in Producing High Performance Concrete and Comparison of Concrete Mix Design Methods
Author: M.R.L SastryPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Use of quality materials, lower water-binder ratio, larger ratio of coarse aggregate to fine aggregate, smaller size of coarse aggregate, fine aggregate of high fineness modulus, suitable cementitious materials and High Range Water Reducer (HRWR) with all materials to their optimum contents are found necessary for producing High Performance Concrete (HPC). Porosity and pore structure characterize the HPC materials in connection with mixture optimization. All are important, but the transition zone is particularly significant with respect to HPC. The aim of concrete mix design is to produce as economically as possible concrete of good workability while maintaining the specified strength, durability and fracture characteristics. This paper emphasizes the properties and dosages of various materials of HPC and comparison of different mix design methods.