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Journal : Civil Engineering Collaboration

Studi Eksprerimental Pengaruh Penambahan Limbah Karet terhadap Kuat Tekan Beton Kahfi Al Fajri Muis; Asri Yuda Trinanda; Rita Nasmirayanti
Civil Engineering Collaboration Vol. 6 (2021) No. 1
Publisher : Universitas Putra Indonesia YPTK Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35134/jcivil.v6i1.19


Building strength that is not up to standard can even be a very bad thing for building users where if the strength is not sufficient then the building will collapse and even collapse if something happens, such as an earthquake and other things. Therefore, this journal aims to mix the strength of concrete with the planning standard which is the Indonesian Nasyonal Standard (SNI), and also this report is a concrete mixing that aims to help the surrounding environment regarding crumb rubber waste, can this waste be used for concrete mixes which aims to reduce the use of coarse aggregate and can increase the compressive strength of concrete, the increasing need for the use of concrete materials, is directly proportional to the increase in the basic needs of concrete constituents which are generally sourced from nature. This research was conducted at the construction materials laboratory of the Putra Indonesia University campus "YPTK" Padang, this research is a concrete mix design used is 1%, 2.5%, 5%, 10%, and in this mix planning aims to reduce the use of coarse aggregate , and the design of this concrete has a concrete treatment time with a span of 3, 7, 21, 28 days, from the results of concrete design which is more focused on the maximum concrete strength time is 28 days, the compressive strength of concrete without mixture is 19.52 Mpa and concrete with 1% concrete mixture is 21.03 Mpa, 2.5% is 13.29 Mpa, 5% is 14.52 Mpa, and 10% is 12.86 Mpa. With a sample cylinder size of 150x300 mm, from the results of this study, we can see that mixing concrete with crumb rubber waste can increase the compressive strength of concrete, but if mixing concrete with too much crumb rubber can cause the concrete to become weak and even unfit.
Pengaruh Limbah Beton sebagai Pengganti Agregat Kasar terhadap Kuat Tekan Beton Maulana Ishaq; Rita Nasmirayanti; Asri Yuda Trinanda
Civil Engineering Collaboration Vol. 6 (2021) No. 2
Publisher : Universitas Putra Indonesia YPTK Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35134/jcivil.v6i2.21


Concrete is the main material factor in a construction project field that is often used, because concrete has a high compressive strength value so it is very useful for structural buildings to withstand axial forces or compressive forces on the building itself where the structure can be used. for the long term. However, along with the increase in construction development in Indonesia, it has a negative impact on the environment around the construction site because with the rampant construction of this building it will trigger environmental pollution due to the remaining concrete waste from the construction project. On this basis, it encourages the author to conduct research by utilizing waste concrete as a substitute for coarse aggregate for the compressive strength of concrete, by reusing the concrete waste will increase the life of the material from the waste itself. In this study, the materials used were tested first, such as; cement density, silt content, water content, specific gravity absorption, wear testing and sieve analysis on aggregates. Then for the concrete mixture using concrete waste with variations of 0%, 25%, 50%, 75% and 100% of the total weight of coarse aggregate. In this study, the compressive strength at the age of 21 days with a mixture of 0%, 25%, 50%, 75%, and 100% concrete had a compressive strength of 200.92 kg/cm2, 188.83 kg/cm2, 206, respectively. 96 kg/cm2, 177.50 kg/cm2, and 179.01 kg/cm2. Then experienced an average shrinkage of 9.53 kg/cm2 at the age of 28 days. The optimum compressive strength is at 50% mixed variation, with a value of 206.96 kg/cm2 because it has an increase of 3% higher than normal concrete compressive strength with a mixing ratio of 1:2.5:3.5 and a slump value of ±13.25 cm and the dry weight of the concrete is 7.69 kg.