Pervious Concrete Test Methods for the Lab and Field

2018 ◽  
Author(s):  
Talal Rehan ◽  
Anne Werner ◽  
Yan Qi
Keyword(s):  
Test Methods ◽  
Pervious Concrete

Investigation into Laboratory Abrasion Test Methods for Pervious Concrete

2013 ◽  
Vol 25 (7) ◽  
pp. 886-892 ◽  
Author(s):  
Qiao Dong ◽  
Hao Wu ◽  
Baoshan Huang ◽  
Xiang Shu ◽  
Kejin Wang
Keyword(s):  
Test Methods ◽  
Pervious Concrete ◽  
Abrasion Test

Test Methods for Characterizing Air Void Systems in Portland Cement Pervious Concrete

2009 ◽  
Vol 6 (9) ◽  
pp. 102451 ◽  
Author(s):  
S. W. Dean ◽  
John T. Kevern ◽  
Kejin Wang ◽  
Vernon R. Schaefer
Keyword(s):  
Portland Cement ◽  
Test Methods ◽  
Pervious Concrete ◽  
Air Void

scholarly journals Salt Scaling of Pervious Concrete: Optimizing a Test Method and The Effects of Different Deicers

2021 ◽  
Author(s):  
Chehong Tsang
Keyword(s):  
Mass Loss ◽  
Failure Criterion ◽  
Cycle Length ◽  
Test Methods ◽  
Standard Test ◽  
Test Method ◽  
Pervious Concrete ◽  
Sample Geometry ◽  
Standard Test Method ◽  
Salt Scaling

There is currently no standard test method for evaluating the resistance of pervious concrete to salt scaling. In this study, a number of test methods were evaluated to determine an effective test method. A number of parameters were varied, including sample geometry, cycle length, level of submersion, and the effects of various deicers. The optimum cycle length was found to be 24 hours with the submersion of the bottom 10 mm of the pervious concrete samples made with 14 mm aggregate. Cylinder samples with a diameter of 100 mm and height of 150 mm are recommended as they provide consistent results. Using these samples, a mass loss failure criterion of 3 to 5% is proposed. The deicers that caused the most damage are NaCl, CaCl2, and urea, followed by MgCl2, K acetate, Na acetate, and CMA. More testing is needed to validate the effects of different deicers. i

scholarly journals Salt Scaling of Pervious Concrete: Optimizing a Test Method and The Effects of Different Deicers

2021 ◽  
Author(s):  
Chehong Tsang
Keyword(s):  
Mass Loss ◽  
Failure Criterion ◽  
Cycle Length ◽  
Test Methods ◽  
Standard Test ◽  
Test Method ◽  
Pervious Concrete ◽  
Sample Geometry ◽  
Standard Test Method ◽  
Salt Scaling

There is currently no standard test method for evaluating the resistance of pervious concrete to salt scaling. In this study, a number of test methods were evaluated to determine an effective test method. A number of parameters were varied, including sample geometry, cycle length, level of submersion, and the effects of various deicers. The optimum cycle length was found to be 24 hours with the submersion of the bottom 10 mm of the pervious concrete samples made with 14 mm aggregate. Cylinder samples with a diameter of 100 mm and height of 150 mm are recommended as they provide consistent results. Using these samples, a mass loss failure criterion of 3 to 5% is proposed. The deicers that caused the most damage are NaCl, CaCl2, and urea, followed by MgCl2, K acetate, Na acetate, and CMA. More testing is needed to validate the effects of different deicers. i

scholarly journals Study on the hydraulic conductivity by constant and falling head methods for pervious concrete

2015 ◽  
Vol 8 (3) ◽  
pp. 248-259 ◽  
Author(s):  
R. BATEZINI ◽  
J. T. BALBO
Keyword(s):  
Hydraulic Conductivity ◽  
Coarse Aggregate ◽  
Aggregate Size ◽  
Test Methods ◽  
Pervious Concrete ◽  
Test Results ◽  
Permeability Characteristics ◽  
Constant Head

The main goal of this paper is to show the analysis of the permeability characteristics of three different mixes of pervious concrete produced with the variation of the coarse aggregate size. Two different test methods were used to achieve the hydraulic conductivity of the samples: falling head and constant head permeability tests. Based on test results it is concluded that the pervious concrete mixes have shown to be good drainable materials. Besides, it was found that the permeability of the mixtures does not seem to depend on the size and gradation of the coarse aggregate.

Laboratory proficiency in susceptibility testing of Helicobacter pylori using agar dilution and E test methods

2001 ◽  
Vol 120 (5) ◽  
pp. A586-A587
Author(s):  
L BEST ◽  
S JO ◽  
V VANZANTEN ◽  
D HALDANE ◽  
V LOO ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Susceptibility Testing ◽  
Test Methods ◽  
Agar Dilution

Scientific and Standardization Committee Communications Comparison of Test Methods for the Lupus Anticoagulant: International Survey on Lupus Anticoagulants-I (ISLA-1)

1990 ◽  
Vol 64 (03) ◽  
pp. 478-484 ◽  
Author(s):  
Thomas Exner ◽  
Douglas A Triplett ◽  
David A Taberner ◽  
Margaret A Howard ◽  
E Nigel Harris
Keyword(s):  
Lupus Anticoagulant ◽  
Test Methods ◽  
Positive Sample ◽  
Direct Proportion ◽  
Clotting Time ◽  
Preliminary Screening ◽  
Activated Platelets ◽  
Tissue Thromboplastin ◽  
Kaolin Clotting Time ◽  
Induced Defects

SummarySix lyophilized plasma samples were sent to 20 “expert” laboratories for assessment of lupus anticoagulant (LA). Four samples contained pooled LA of graded potency mixed with aged normal plasma. One contained LA plus cephalin phospholipid and one contained a nonspecific venom anticoagulant. Sixteen methods were used overall with some participants using up to 8 methods. Results were scored in regard to the known potencies of LA in the samples and other known induced defects.Activated partial thromboplastin time (APTT) tests used by most participants for preliminary screening were relatively sensitive, but non-specific. Platelet or phospholipid neutralization procedures (PNP) appeared to be sensitive and specific but showed a non-linear response to increased LA content. Kaolin clotting time (KCT) tests showed the most sensitive response to increased LA content but the weaker LA were not scored as abnormal by most laboratories as the samples may have contained platelet fragments. Other commonly used tests such as the tissue thromboplastin inhibition (TTI) test and the dilute Russell’s viper venom test (DRVVT) were carried out somewhat inconsistently. The variability in performance of tests in different laboratories indicates that standardization of methodology is urgently required.Generally it seemed that most clotting tests were “bypassed” by the addition of phospholipid to a known LA-positive sample in apparently direct proportion to their sensitivity. Sample preparation, especially prevention of contamination with activated platelets is a vital preliminary part in the assay of LA.

Test Methods for Assessing Abrasion Impact on CSP Drainage Structures

WRPMD'99 ◽  
1999 ◽  
Author(s):  
Brian C. Roberts ◽  
J. P. Ault
Keyword(s):  
Test Methods

A method for measuring the in-plane compressive strength and the compression behavior of coating layers

TAPPI Journal ◽  
2011 ◽  
Vol 10 (7) ◽  
pp. 29-34
Author(s):  
TEEMU PUHAKKA ◽  
ISKO KAJANTO ◽  
NINA PYKÄLÄINEN
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Calcium Carbonate ◽  
Coating Layer ◽  
Test Methods ◽  
Coating Films ◽  
Precipitated Calcium Carbonate ◽  
Coating Color ◽  
Mineral Coatings ◽  
Styrene Butadiene

Cracking at the fold is a quality defect sometimes observed in coated paper and board. Although tensile and compressive stresses occur during folding, test methods to measure the compressive strength of a coating have not been available. Our objective was to develop a method to measure the compressive strength of a coating layer and to investigate how different mineral coatings behave under compression. We used the short-span compressive strength test (SCT) to measure the in-plane compressive strength of a free coating layer. Unsupported free coating films were prepared for the measurements. Results indicate that the SCT method was suitable for measuring the in-plane compressive strength of a coating layer. Coating color formulations containing different kaolin and calcium carbonate minerals were used to study the effect of pigment particles’ shape on the compressive and tensile strengths of coatings. Latices having two different glass transition temperatures were used. Results showed that pigment particle shape influenced the strength of a coating layer. Platy clay gave better strength than spherical or needle-shaped carbonate pigments. Compressive and tensile strength decreased as a function of the amount of calcium carbonate in the coating color, particularly with precipitated calcium carbonate. We also assessed the influence of styrene-butadiene binder on the compressive strength of the coating layer, which increased with the binder level. The compressive strength of the coating layer was about three times the tensile strength.

Sign in / Sign up

Export Citation Format

Share Document