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CM_3400_TEST_3

CM_3400_TEST_3 - TEST 3 3 TYPES OF CONCRETE JOINTING 1...

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TEST 3 3 TYPES OF CONCRETE JOINTING 1. CONTROL/CONTRACTION JOINT – CREATE WEAKEND PLANES 2. ISOLATION OR EXPANSION JOINT – SEPERATE STRUCTURES 3. CONSTRUCTION JOINTS – SURFACE WHERE 2 SUCCESSIVE PLACEMENTS MEET WAYS TO MAKE CONCRETE JOINTING 1. SAWED 2. TOOLED 3. ZIP STRIPS HOW DEEP? T/3 – IF SUB BASE T/4 – IF SUB BASE NO LESS THAN 1” CONCRETE JOINTING SPACING 2 - 2.5 x THICKNESS= FT OR 24-30 x THICKNESS INCHES MAX- 15’ (RECOMMENDED) PANELS o 1.25-1.5 (LENGTH) = 2 (WIDTH) = MAX WHEN SAWING JOINTS – TYP WANT TO CUT NO LATER THAN 36 HOURS AFTER POUR & WHEN ITS COOLER SLUMP TEST FILL IT UP WITH 3 LAYERS OF EQUAL VOLUME ROD EACH LAYER 25 TIMES SCRAPE OFF SURFACE STIFF = 0-2” o MASSIVE SECTIONS, LITTLE REINFORCEMENTS o USE VIBRATION MEDIUM = 2-5” o COLUMNS, BEAMS, AND RETAINING WALLS FLUID = 5-8” o HEAVILY REINFORCED SECTION, FLOWABLE CONCRETE
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TEMPERATURE EFFECTS CURING THE HIGHER THE TEMPERATURE THE FASTER THE CURING BEST TEMPERATURE IS ROOM TEMPERATURE IF CONCRETE FREEZES DURING THE FIRST 24 HOURS. IT MAY NEVER BE ABLE TO ATTAIN IT’S ORIGINAL PROPERTIES REAL HIGH TEMPS ABOVE 120°F CAN CAUSE SERIOUS DAMAGE SINCE CEMENT MAY SET TOO FAST ACCELERATED CURING PROCEDURES PRODUCE STRONG CONCRETE, BUT DURABILITY MIGHT SUFFER. (HIGHWAY CONSTRUCTION) CURING INVOLVES MAINTAINING SURFACE MOISTURE o WET STRAW OR BURLAP SACKS o PONDING WATER o COVERING WITH PAPER OR PLASTIC o APPLYING CURING COMPOUNDS MAINTAINING FAVORABLE CURING TEMPERATURE CONCRETE PAVING ADVANTAGES o LITTLE MAINTANCE o IMMUNE TO PETROLEUM PRODUCTS o FUNCTIONS ON WEAKER BASE o DOES NOT RUT LIKE ASPHAULT DISADVANTAGES o SLOW TO CONSTRUCT o LONGER CURING TIME o MORE COSTLEY o HARD TO REPAIR o ASPHAULT CAN BE RECYCLED WHENEVER YOU INCREASE WATER IN CONCRETE YOU INCREASE VOLUME WITH DECREASE IN STREGHTH AND DENSITY FACTORS RESULTING IN LOW- DURABILITY CONCRETE A. HIGH W/C RATIO B. INADEQUET CEMENT CONTENT C. INADEQUET AIR ENTRAINED SYSTEM D.
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