#TITLE_ALTERNATIVE#

• Main Author: SURYA KUSUMA (NIM : 13705035); Pembimbing : Dr. Ir. Aditianto Ramelan, IRAWAN
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/16092
• Institution: Institut Teknologi Bandung

Silica fume is a pozzolanic compound that is highly known as one of the cementious material available in the production of certain types of concrete. The purpose <br /> <br /> <br /> <br /> <br /> of this study was to find out the effectiveness SikaFume® , which is the product of PT Sika Indonesia, in producing high strength mortar with low water/cement ratio as the <br /> <br /> <br /> <br /> <br /> substitution for cement. Superplasticizer used in this study is Sikament®-NN, a product of PT Sika Indonesia, which was added to improve the mixture’s flowability. <br /> <br /> <br /> <br /> <br /> The ratio of SikaFume® - cement (s/c) used in this study were 0,11; 0,17; and 0,25. The ratio of water - cement (w/c) used were 0,25; 0,30; and 0,35. Cement and <br /> <br /> <br /> <br /> <br /> superplasticizer were determined as constant variable on 30 w/o and 2 w/o. The samples were air cured for two weeks since they were casted. Compression tests were conducted <br /> <br /> <br /> <br /> <br /> using Tarnogrocki Universal Testing in laboratory of Metallurgy and Materials Engineering ITB. The compressive strengths obtained for normal mortar in this research <br /> <br /> <br /> <br /> <br /> is quite low. The lowest strength of speciments with w/c of 0,35 is 5,8 MPa and the highest was 28,1 MPa for w/c 0,35 with s/c 0,17. For more thorough analysis, XRD and SEM characterization were also performed for both compositions. Silica sand and SikaFume® were also characterized by SEM, therefore showed that SikaFume® in the form of agglomerates. <br /> <br /> <br /> <br /> <br /> This study showed that on normal mortar, increasing w/c make the compressive strength lower. While the used of SikaFume® in higher w/c make the compressive strength higher. However, the increasing of s/c ratio reduce the maximum compressive strength. Lower cement – aggregate ratio (c/a) and the massive expansion of pores formed reduce the compressive strength. This result is below the targeted value of 280 MPa.