00212693

Component

https://onlinepubs.trb.or...bproceedings/30/30-024.pdf

RESULTS OF TESTS ARE PRESENTED COVERING A 25 YEAR PERIOD INVOLVING A NUMBER OF SPECIMENS UNDER VARIABLE TEST CONDITIONS. THE MOST RECENT TESTS INDICATE THAT: (1) THERE WAS A VERY DEFINITE ACCELERATION IN COMPRESSIVE STRENGTH FOR ALL CALIFORNIA CEMENTS AND FOR CONCRETE AT 1 YEAR (REGARDLESS OF THE PERCENTAGE OF CALCIUM CHLORIDE) LESS THAN WITHOUT CALCIUM CHLORIDE. (2) UNDER MOIST-ROOM INITIAL CURING AT 70 DEGREES F, THE CALCIUM CHLORIDE INCREASED THE INITIAL SHRINKAGE AS WELL AS THE SUBSEQUENT VOLUME CHANGE UNDER WETTING AND DRYING CYCLES. (3) WHEN STORED AT 100 DEGREES F AND 30 PERCENT RELATIVE HUMIDITY IMMEDIATELY AFTER FABRICATION, THE SETTING SHRINKAGE WAS LESS WITH THE CALCIUM CHLORIDE THAN WITHOUT, BUT THE SUBSEQUENT TOTAL SHRINKAGE AND WET DRY VOLUME CHANGES SUBSTANTIALLY PARALLELED THE SPECIMENS IN WHICH NO CALCIUM CHLORIDE HAD BEEN USED. (4) THE COMPRESSIVE STRENGTHS WERE NOT MATERIALLY AFFECTED BY THE INITIAL AND SUBSEQUENT CURING AND WETTING AND DRYING PROCEDURE REGARDLESS OF THE TYPE OF CEMENT OR PERCENTAGE OF CALCIUM CHLORIDE. (5) WHEN INITIALLY CURED IN THE MOIST ROOM FOR 7 DAYS, THE MODULUS OF RUPTURE AND MODULUS OF ELASTICITY DURING THE SUBSEQUENT WET-DRY CYCLES WAS AS A RULE LOWERED BY THE CALCIUM CHLORIDE, BUT THE DIFFERENTIAL WAS NOT MATERIAL EXCEPT IN THE CASE OF THE TYPE III CEMENTS. (6) WHEN INITIALLY CURED UNDER ADVERSE CONDITIONS, THE CALCIUM CHLORIDE WAS APPARENTLY BENEFICIAL WITH RELATION TO THE MODULUS OF RUPTURE AS WELL AS COMPRESSIVE STRENGTHS. (7) UNDER INITIAL THOROUGH WATER CURING CONDITIONS, CALCIUM CHLORIDE APPARENTLY INCREASES THE INITIAL SHRINKAGE AND INDUCES SUBSEQUENT GREATER WET-DRY VOLUME CHANGES, INDICATING THE SPARING USE OF THIS ADDITIVE WHEN HIGH TENSILE STRENGTH IS IMPORTANT, OR SEVERE RUSTING OF REINFORCING STEEL MAY BE FACILITATED BY THE INFILTRATION OF MOISTURE THROUGH SURFACE CRACKS. /AUTHOR/

No 30, pp 232-252, 21 FIG, 8 TAB, 8 REF. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01490395

1951

Highway Research Board Proceedings

Digital/other

Accelerators (Devices); Calcium chloride; Compressive strength; Concrete curing; Handling and storage; Modulus of elasticity; Modulus of rupture; Portland cement concrete; Shrinkage; Storage facilities; Volume changes; Wetting and drying tests

Freight Transportation; Highways; Materials; Terminals and Facilities

TRIS, TRB

May 13 1994 12:00AM

• A COMPARISON OF LOWER CASE AND CAPITAL LETTERS FOR HIGHWAY SIGNS
• A STUDY OF THE VIBRATIONS PRODUCED IN STRUCTURES BY HEAVY VEHICLES
• A STUDY OF VEHICLE, ROADWAY, AND TRAFFIC RELATIONSHIPS BY MEANS OF STATISTICAL INSTRUMENTS
• A TECHNIQUE FOR THE DETERMINATION OF A THERMAL CHARACTERISTIC OF STONE
• A THEORY ON LOADS ON NEGATIVE PROJECTING CONDUITS
• BITUMINOUS PAVEMENT INVESTIGATION IN UTAH AND COLORADO
• DEFLECTIONS IN SLABS ON ELASTIC FOUNDATIONS
• DILATOMETER METHOD FOR DETERMINATION OF THERMAL COEFFICIENT OF EXPANSION OF FINE AND COARSE AGGREGATE
• EFFECT OF MORTAR SATURATION IN CONCRETE FREEZING AND THAWING TESTS
• EFFECTS OF REVERSIBLE LANE MOVEMENT SIGNALIZATION OF THREE LANE HIGHWAYS
• EXPEDIENT METHODS FOR STABILIZING SWAMPS
• HIGH-STRENGTH BOLTS AS A MEANS OF FABRICATING STEEL STRUCTURES
• HIGHWAY FINANCE PROBLEMS IN THE WEST
• JACKSON BOULEVARD ANALYSIS OF TRAFFIC OPERATIONS
• KANSAS' EXPERIENCE WITH CONCRETE SAW FOR CUTTING CONTRACTION JOINTS IN CONCRETE PAVEMENT
• LIME-FLY ASH COMPOSITIONS FOR USE IN HIGHWAY CONSTRUCTION
• MICHIGAN'S EXPERIENCE IN THE USE OF WHITE-PIGMENTED MEMBRANE CURING COMPOUNDS
• MINNESOTA PRACTICES ON SALVAGING OLD PAVEMENTS BY RESURFACING
• MISCONCEPTIONS IN THE USE OF SURFACE TENSION IN CAPILLARITY
• PARKING FACILITIES AS PUBLIC UTILITIES
• PHOTOGRAMMETRY AND ITS USES IN HIGHWAY PLANNING AND DESIGN
• PROPERTIES OF PLAIN AND REINFORCED LIMEROCK CONCRETE
• REPORT OF COMMITTEE ON BRIDGE DESIGN
• REPORT ON EXPERIMENT WITH CONTINUOUS REINFORCEMENT IN CONCRETE PAVEMENT - NEW JERSEY
• REPORTS ON EXPERIMENTS WITH CONTINUOUS REINFORCEMENT IN CONCRETE PAVEMENTS - CALIFORNIA
• SECONDARY ROAD ADMINISTRATION IN LINN COUNTY, IOWA
• SOILS ENGINEERING IN RAILWAY CONSTRUCTION AND MAINTENANCE
• SPEEDS ON RURAL HIGHWAYS, PAST AND PRESENT
• STANDARD DEVIATION AND COEFFICIENT OF VARIATION OF AUTOMATIC TRAFFIC RECORDER COUNTS
• STATE HIGHWAY PERSONNEL PRACTICES
• STRESS DISTRIBUTION BELOW PAVEMENTS UNDER TROLLEY BUS LOADINGS
• STUDIES OF COMPRESSIVE STRESS DISTRIBUTION IN SIMPLY REINFORCED CONCRETE NEAR THE POINT OF FAILURE
• STUDIES OF THE CLAY FRACTION IN ENGINEERING SOILS
• STUDIES ON THE HEATING OF BRIDGE DECKS AND CONCRETE PAVEMENTS
• SUPPLEMENT TO STRESS DISTRIBUTION IN A HOMOGENEOUS SOIL
• SURVEY OF DOWNHILL SPEEDS OF TRUCKS ON MOUNTAIN GRADES
• THE CONTROL OF A LANDSLIDE BY SUBSURFACE DRAINAGE
• THE MOHR DIAGRAM AND COULOMB EQUATION
• THE OVERLAY OF RIGID PAVEMENTS
• THE PERFORMANCE OF CONCRETE RESURFACING IN INDIANA
• THERMAL EXPANSION CHARACTERISTICS OF HARDENED CEMENT PASTE AND OF CONCRETE
• THREE-YEAR PERFORMANCE REPORT ON EXPERIMENTAL CONTINUOUSLY REINFORCED CONCRETE PAVEMENT IN ILLINOIS
• Total Travel in North Carolina Municipalities
• TRAFFIC REPORT BEFORE AND AFTER IMPROVEMENT AT INTERSECTIONS ROUTES 1 AND 25
• TWENTY YEARS OF ROADSIDE DEVELOPMENT