A dynamic load on piles test is a quick, efficient test that provides verification of pile capacity. It uses an applied impact force at the pile top while monitoring the pile response using a Pile Driving Analyzer. Combined with static tests, the Dynamic Load Test addresses site variability and allows a more economical design.
The dynamic load test measures the impact stress wave traveling down the pile and the reflected stress wave that returns up the pile, generated by penetration resistance and changes in pile properties. Transducers installed on the pile measure strain and acceleration, which are transmitted to the pile driving analyzer machine via cable or wireless connection.
The dynamic load test can be a stand-alone test for either driven or cast-in-place piles. The test is nondestructive and requires only the sensors, data collection system plus an impact force from a hammer or drop weight.
Dynamic tests have a small footprint on site and cause minimal disruption to construction operations. The equipment monitors pile stresses to help avoid installation damage and provides real-time feedback on capacity.
Proper interpretation of dynamic test results requires a high level of technical expertise, which SKGPEPL engineers maintain through training and assessment. Detailed resistance and integrity analysis for a variable pile model is performed on end-of-drive or restrike blows using the CAPWAP computer program.
SKGPEPL’s experienced technicians and engineers can provide preliminary test results on site, and detailed analysis within 24 hours when required.
we need to determine the fineness of cement by dry sieving as per IS: 4031 (Part 1) – 1996.The principle of this is that we determine the proportion of cement whose grain size is larger then specified mesh size.
The apparatus used are 90m IS Sieve, Balance capable of weighing 10g to the nearest 10mg, A nylon or pure bristle brush, preferably with 25 to 40mm, bristle, for cleaning the sieve.
The Specific gravity defined as the ratio between the weight of given volume of the cement and weight of an equal volume of water. The most popular method of determine S.G of cement is by use of the kerosene which doesn’t react with cement.
The setting and hardening of a cement is a continuous process, but two points are distinguished for test purposes. The initial setting time is the interval between the mixing of the cement with water and the time when the mix has lost plasticity, stiffening to a certain degree. It marks roughly the end of the period when the wet mix can be molded into shape.
The final setting time is the point at which the set cement has acquired a sufficient firmness to resist a certain defined pressure. Most specifications require an initial minimum setting time at ordinary temperatures of about 45 minutes and a final setting time no more than 10 to 12 hours.
It is the property of cement due to which it undergoes large change in volume after setting. This change in volume may cause crack and disintegration of concrete. To check the soundness of cement Le-Chatlier’s apparatus is used.
Compressive strength of cement indicates the compressive strength of cement mortar cubes (7.07cmx7.07cmx7.07cm) of 1:3 proportion, using standard sand as specified by IS :650 (1966) as fine aggregate, tested under compression (Grade of cement indicates their compressive strength at the end of 28 days of curing).
Many other properties of mortar / concrete are related to compressive strength of cement, because cement is used in structure in the form of mortar or concrete.
Concept Structure:
SKG Project & Engg. Pvt. Ltd., have a state of art Material Testing Laboratory in Mumbai.
