E-ISSN: 2456-2033

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IJAREM: Volume 08 - No. 10, 2022


1. Modulus Effect of Aggregate Fineness on Compressive Strength and Flexural Test Concrete K-175
Virma Septiani, Viktor Suryan, Direstu Amalia, Dwi Cahyono, Ari Romansyah
The research entitled the effect of Fineness Aggregate Modulus on the Strength and Flexibility Test of K-175 Quality Concrete has the aim of comparing the compressive strength of normal concrete with the composition of the aggregate grain size to form a fineness modulus (FM) value with a variation of 5.00 – 5.50 -6.00. The method was a qualitative approach. The research was carried out in a laboratory which included Analysis of aggregates, specific gravity, and aggregate absorption, examination of aggregate content, aggregate wear testing, concrete molding, concrete treatment and final testing of the strength and flexibility of concrete. The planning of the concrete mix (concrete mix design) was determined by the number of concrete-forming materials needed. The arranged fine and coarse aggregates formed a combined fineness modulus (FM) value of 5.00-5.50-6.00. The data collection technique used was observation. The results showed that from the composition regulated by the National Standard of Indonesia T-15-1990-03, the need for fine aggregate was 101,48 kg, and coarse aggregate was 93,97 kg. By separating the grain size of the broken aggregate on a certain sieve and then distributing the grain size of the aggregate, the required fineness modulus on the aggregate is 2.93, and the fineness modulus on the coarse aggregate is 7.25, with a combined fineness modulus 0f 5.00, then the fineness modulus on the coarse aggregate. The fine aggregate is 3.40, while the coarse aggregate is 7.73, with a combined fineness modulus of 5.50. The fineness modulus of fine aggregate is 3.78, and the fineness modulus of coarse aggregate is 8.35, with a combined fineness modulus of 6.00. From the results of this study, the value of the compressive strength of concrete which was converted to cylindrical specimens at the age of 28 days was normal at 220,079 kg/cm2, while the concrete with a compressive strength value set by FM 5.00 was 160,954 kg/cm2; FM 5.50 is 206.915 kg/cm2; FM 6.00 is 267,193 kg/cm2. Meanwhile, the flexural strength of concrete is normal at 40,788 kg/cm2; FM 5.00 40,788 kg/cm2; FM 5,50 47,585 kg/cm2; FM 6.00 47,586 kg/cm2. The research concludes that the distribution is carried out by separating the grains retained on a certain sieve and composing according to the needs of the aggregate. As a comparison material, the value of the compressive strength of concrete is used in actual aggregate conditions. From the results of the compressive strength obtained that the concrete with the value of FM 5.00 and FM 5.50 decreased, but the concrete with the value of FM 6.00 experienced an increase, while the flexural strength of the concrete FM 5.00 was the same, the concrete with the value of FM 5.50 and FM 6.00 increased. The concrete with the fineness modulus (FM) value is set to have good porosity from the above conditions. It can be an option for the application of the packing density method.


2. Project management for the construction sector in the field of foundation of buildings in complex conditions of the subsoil
Ph.D. Eng. Monika Gwóźdź – Lasoń, Eng. Jacek Kohutek
Project management in the construction sector is a challenge for modern construction. The speed of implementation of construction projects becomes a priority and a very important factor affecting the financial result. The modularity and repeatability of building structure solutions nowadays turn out to be a very tempting stimulus, resulting in the integration of identical structures into different parts of the region, country and continent. Failure to use appropriate patterns and algorithm of proceedings during geotechnical analysis of the ground substrate may lead to catastrophic investment effects. The publication discusses wide geotechnical perspectives that affect the type, methods and technologies of the foundation structure of buildings and management of this investment stage. The foundation design scheme and the method of creating 3D ground substrate models were presented. The possibility of determining and selecting the appropriate design computing methodology for generous models for in situ methods and laboratory research of subsoi mechanics, actual layers of land was presented. The land model was generated in the Geo5 2022 program - 3D stratigraphy. The design was made in accordance with EC7 for all generated calculation models.









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