Skripsi

Analysis of mechanical properties of self compacting concrete with variation of fine aggregate substitution from sea sand of Delegan Beach, Gresik Regency / Umar Syarief

Abstrak
Indonesia s rapid infrastructure development demands innovation in construction materials especially concrete which is the main element in more than 60% of development projects. One important innovation is Self-Compacting Concrete (SCC) a concrete that is capable of self-compacting without the aid of vibrating devices making it ideal for complex structures with tight reinforcement. In SCC fine aggregates such as sand play an important role in the physical and mechanical properties of concrete. This study aims to assess the potential utilization of sea sand from Delegan Beach Gresik as a fine aggregate substitute given its abundant availability but high salt content. The main objectives were to determine the physical properties of fresh concrete (slump flow and T50) evaluate the mechanical properties (compressive strength split tensile and modulus of elasticity) and analyze the effect of water-cement factor and aggregate specific gravity on compressive strength. The method used was a laboratory experiment with four mix variations 100% normal sand as the control and 30% 50% and 70% marine sand substitution. The mix used PCC cement and Sika Viscocrete 3115N superplasticizer at 0.9% by weight of cement. Tests were conducted on fresh concrete and hardened concrete at specific ages. Results showed that the 70% marine sand variation (L70) gave the best performance with a compressive strength of 22.198 MPa exceeding the control (21.820 MPa) the highest split tensile strength of 3.342 MPa and a modulus of elasticity of 29.495 MPa. Concrete with washed marine sand showed an overall improvement in quality over the other variations. Further analysis showed that a high water-cement factor (FAS) increased the viscosity of the concrete but decreased the strength as seen in the L30 variation. In contrast the low FAS at L70 resulted in higher compressive strength. The specific gravity of the fine aggregates also affected the density of the mix where aggregates with higher specific gravity increased the density of the concrete which had a positive impact on the mechanical strength. From these findings it can be concluded that Delegan Beach marine sand has the potential to be used as fine aggregate in SCC up to 70% substitution provided that it is pre-washed. This opens up opportunities for effective and sustainable utilization of local materials in supporting national infrastructure development.

Informasi Detail

DDC

SKRIPSI DIGITAL

Prodi

Universitas Negeri Malang. Program Studi Teknik Sipil, 2025.

Deskripsi Fisik

xvii, 80 hlm. : ilus.

Bahasa

No Reg

1582/RS/25

Edisi

Skripsi (Sarjana)--Universitas Negeri Malang. 2025

Subjek

1. SELF COMPACTING CONCRETE - MECHANICAL PROPERTIES
2. CONSTRUCTION MATERIALS - ALTERNATIVE AGGREGATES
3. CIVIL ENGINEERING - CONCRETE TECHNOLOGY

Pembimbing

1. Syahidah Fani Nastiti, S.t., M.t.

Lampiran Berkas