Various research and experiments in the field of concrete is done as an effort to improve the quality of concrete, materials technology and implementation techniques obtained from the results of research and experiment, it is intended to answer the higher demands on the use of concrete and overcome the constraints that often occur in the implementation of the concrete work in the site. The purpose of this research was to compare the value of compressive strength of normal concrete with compressive strength of concrete using SikaFume and clamshell. The compositions of the SikaFume mixture used in this research were 5% and 8% and for the shellfish used were also 5% and 8% of the weight of cement for all variations. The test specimens used were cylindrical, the planned concrete quality was 45 MPa tested at 21 days and 28 days with prior curing before testing. This research tested concrete with cylindrical test object for compression test of 30 specimens and consisted of 2 variations and each variation of 5 samples. From this research, it was found that the highest concrete compressive strength was found in the 8% SikaFume addition concrete mix and 8% shellfish at 28 days old that is 45.62 MPa when compared with the normal concrete.

Coconut Shell actived Nanocarbon to Lightweight Concrete have done. LWC mixture of CS actived nanocarbon fillers made by mixing PPC cement, sand, broken stone, coconut shell actived nanocarbon fillers and water in various proportions. The ratio of CS actived nanocarbon on filler used (x = 0%, 5%, 10%, and 15%), with the aim of getting a different level of compressive strength testing. The particle size of activated CS carbon using the high temperature physical activation method 800C and chemistry (immersion of ZnCl2 solution) has an average diameter of 4,842.8 nm. The SEM shows that high porosity occurs and the shape is not homogeneous. EDS analysis to determine composition of the elements in the sample is known that the CS activated carbon samples have a maximum value in the element Carbon, Oxygen. The sample of CS actived Nanocarbon to LWC x = 0%, the results of the maximum value of % mass and % atom are the elements Oxygen, Carbon, and Calcium. For x = 10% the maximum value are the elements Oxygen, Carbon, and Silicon. The value of the strength of the objects in the CS activated carbon filler concrete sample (x = 5%) has maximum strength value 12.9 Mpa.