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International Concrete Abstracts Portal

Showing 1-5 of 5 Abstracts search results

Document: 

13-303

Date: 

March 1, 2015

Author(s):

Yail J. Kim, Shahlaa Al Wakeel, Adel Gaddafi, and Young-Jin Cha

Publication:

Materials Journal

Volume:

112

Issue:

2

Abstract:

This paper presents a case study for examining the in-place performance of pervious concrete in a medium-size parking lot in Denver, CO. Of interest are the surface characteristics and hydraulic properties of the concrete dependent upon the degree of deterioration. Test results include pavement texture depth, skid resistance, surface profile, infiltration, and traffic volume. A statistical approach, analysis of variance, is conducted to evaluate the distinct surface properties of various locations in the parking lot. Mutual independency between the surface texture depth and skid resistance is discussed. A practice-oriented predictive model is proposed to estimate an international roughness index of pervious concrete using a texture depth value and skid resistance. A relationship between the infiltration of the pervious concrete and traffic attributes is established. The performance reliability of the parking lot is evaluated in conjunction with critical rainfall intensity.

DOI:

10.14359/51686993


Document: 

95-M68

Date: 

November 1, 1998

Author(s):

Felix E. Amparano and Yunping Xi

Publication:

Materials Journal

Volume:

95

Issue:

6

Abstract:

Non-sand concrete is a concrete which only contains normal portland cement, water and coarse aggregate. The use of non-sand concrete has expanded into many areas such as: drainage pipes, wells, small retaining walls, pavements (for local roads and parking lots). One of the disadvantages of such concrete is the difficulty in mixing and placing due to the stiff consistency of the mixture caused by the low water-cement ratio required to prevent segregation. This problem could be much less burdensome, or even eliminated, if methods of placing could be developed using conventional concrete placement methods. The investigation reported in this paper explored one such method, that is, the placement by pumping in which the concrete was made pumpable by adding several admixtures. Pumping characteristics are base on the mixture's ability to provide good slump and excellent cohesiveness. The test results include compressive and flexural strengths, permeability, unit weight, and the potential for the mixture to be pumped successfully. The purpose of this research was to obtain a pumpable non-sand concrete mixture, within the specified design parameters, which does two purposes that is, exhibits excellent pumping characteristics and yields equal or higher strength values than that of mixtures made without admixtures. The results indicated very good performance of mixtures containing silica fume concurrently with the hydroxyethyl cellulose admixture. This holds true for non-sand concrete mixtures containing 12.7 mm and 6.35 mm maximum size aggregates.

DOI:

10.14359/413


Document: 

93-M40

Date: 

July 1, 1996

Author(s):

Antonio Nanni, Dennis A. Ludwig, and James E. Shoenberger

Publication:

Materials Journal

Volume:

93

Issue:

4

Abstract:

In an RCC demonstration project that consisted of a 1525 ft-(465-m)-long roadway and a 100 x 39-ft (30 x 12-m) parking lot, the effect of several construction parameters on physico-mechanical properties of the pave-ment and the load transfer efficiency at its joints and cracks were investigated. This paper reports experimental results on lay-down and final densities as affected by paver speed and rolling pattern, the strength of laboratory-made specimens using the vibratory hammer method as a function of mixes with slightly different aggregate gradations, cracking patterns at 7 months from construction as affected by saw-cut joint spacing, and load transfer efficiency at natural cracks and saw-cut joints. Overall, the results fall within the expectations of the program and confirm the suitability of current construction practices for RCC paving applications.

DOI:

10.14359/9822


Document: 

90-M41

Date: 

July 1, 1993

Author(s):

ACI Committee 330

Publication:

Materials Journal

Volume:

90

Issue:

4

Abstract:

This standard covers minimum requirements for the construction of plain concrete parking lots on grade. Included are requirements for materials, placing, texturing, curing, jointing, and opening to traffic.

DOI:

10.14359/3898


Document: 

84-M48

Date: 

November 1, 1987

Author(s):

ACI Committee 330

Publication:

Materials Journal

Volume:

84

Issue:

6

Abstract:

Concrete parking lots now serve many transportation facilities, industrial plants, commercial developments, and multifamily housing projects of all sizes. They are used for storage of vehicles and goods. They provide maneuvering areas for vehicles and access for delivery and distribution vehicles. The design and construction of concrete slabs for parking lots and outside storage areas share many similarities with the design and construction of streets and highways, but they also have some very distinct differences. A full appreciation of the differences and the modification of design and construction procedures to take these differences into account can result in economical and serviceable concrete parking lots that will provide satisfactory service for many years with minimum maintenance. Guide includes information on site investigation, thickness determination, design of joints and other details, paving operations, and quality assurance procedures during construction. Maintenance and repair are also discussed.

DOI:

10.14359/3184


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