V funnel test and V funnel test at T 5 minutes on SCC The equipment consists of a v shaped funnel as, show in Fig. An alternative type of V-funnel, the O funnel, with circular. The test was developed in Japan and used by Ozawa et al. The equipment consists of V-shaped funnel section is(…)
Material Testing Guide
SLUMP FLOW TEST ON SELF COMPACTING CONCRETE
Slump flow test and T50cm test on Self Compacting Concrete The slump flow test is used assess the horizontal free flow of in the absence of obstructions. It was first developed in Japan for use in assessment of underwater concrete. The test method is based on the test method for determining the slump .T diameter(…)
ACCEPTANCE CRITERIA FOR DESIGN MIX CONCRETE
Design Mix Concrete Acceptance Criteria: I. The concrete shall be deemed to comply with the strength requirements if: a) every sample has a test strength not less than the characteristic value;or b) The strength of one or more samples though less than the characteristic value, is in each case not less than the greater of(…)
CHEMICAL TESTS ON CONCRETE STRUCTURES
Chemical analysis of concrete can provide extremely useful information regarding the causes of failure of concrete. The tests most frequently carried out are listed below: Depth of carbonation Chloride content Cement content Sulphate content Type of cement Alkali content Carbonation test This test is carried out to determine the depth of concrete affected due to(…)
TESTS ON BUILDING STONES
Building stones are to be tested for their properties. Following are the tests conducted on stones: Acid Test: Here, a sample of stone weighing about 50 to 100 gm is taken. It is placed in a solution of hydrophobic acid having strength of one percent and is kept there for seven days. Solution is agitated(…)
RESISTANCE OF DIFFERENT TYPES OF CONCRETE TO SULFURIC ACID
The resistance of seven different concrete mixtures against a 0.5% sulfuric acid solution was examined. The difference between high sulfate resistant Portland cement and blast furnace cement, as well as the influence of polymer modifications of the concrete and the addition of silica fume were issues of the investigation. All concrete mixtures were submitted to(…)
HOT WEATHER CONCRETING
Placing Concrete in Hot Weather Caution needs to be applied when placing concrete in hot weather. Without the proper care, concrete may have reduced strength and will be very prone to cracking due to rapid drying. It also may stiffen quickly making finishing quite difficult. At some point, usually between 75ºF. and 100ºF., hot weather(…)
COLD WEATHER / WINTER CONCRETING
Placing Concrete During Cold Weather If the temperature of fresh concrete is 55ºF., or greater — and if the concrete is maintained at a temperature of 55ºF. or higher — then winter concreting should be trouble-free. Approximate set time for concrete at 70ºF. is six hours. Set time jumps to just over 14 hours if(…)