Value of concrete compressive strength with variation of candlenut shell applicated to plate on a non-destructive test using UPV

Abstract

Concrete began to use substitute materials to reduce the brittle nature. Substitution material is material that can replace concrete material both coarse aggregate, fine aggregate, and cement with other materials, such as Portland cement with steel slag, broken stone (coarse aggregate) with pumice and other stones. One of the benefits of the concrete material substitution method is that it can use organic waste. Organic waste can be in the form of residual production or usage, one of which is the candlenut shell which is a waste of candlenutThe candlenut shell is a new potential that can be developed and utilized even greater. Of course It can increase the economic value of the candlenut shell which has only been known as a waste material from the candlenut. The composition of the candlenut shells are CaO, SiO2, Al2O3, MgO, H2O, Fe2O3. When all reacts, there will be residual SiO2 that has not yet reacted to form a silica derivative reaction with CSH-2 gel resulting in a denser CSH-3 gel, which will increase the cement paste and aggregate. The purpose of this discussion is to determine the compressive strength value of candlenut shell concrete at 0% and 30% variation on the plates using Ultrasonic Pulse Velocity (UPV) at 28 days. The method used is experimental by testing samples / specimens in the form of reinforced plate size of 50cmx25cmx12cm with wet curing and dry curing methods with a variation in age of 28 days. Concrete compressive strength testing is done using UPV tools. The results of this discussion are the compressive strength of 30% candlenut shell variations on the application of the plate shows that the quality of the concrete produced in the wet curing reaches 18 MPa or equivalent to the quality of the K 225 concrete and the dry curing is only 14 MPa or equivalent to the quality of K175, while the variation Candlenut shells 0% (normal concrete) reach 28 MPa on wet curing and 24 MPa on dry curing. This shows that the plate with a variation of 30% candlenut shells are still able to achieve concrete quality II for use in structural work.