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All Journal Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan
Mardiaman Mardiaman
Tama jagakarsa University

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Study of Progress Expected Results Based on Percentage of Construction Work Plan Duration Mardiaman Mardiaman; Edward Kusuma
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 6, No 2 (2021): September
Publisher : Litbang Pemas - Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v6i2.628

Abstract

Abstract. Controlling how construction work is completed is critical to success. Generally, the result value method is used as the tool. Although this method has been applied to a variety of different types of construction work, the tool has been limited to a single project. This study examines the total value of completed construction work. Because the duration of construction work varies, the researchers refer to the percentage of the plan's duration. The percentages are set at 25%, 30%, and 50%. There have been 17 completed building construction projects between 2017 and 2018. Additionally, a comparison sample of construction work is used. The results of the data processing are pessimistic, most likely, optimistic, and hopeful. Additionally, the expected value is compared to a reference value. The expected values for the percentages of 25%, 30%, and 50% are (-2.425), (1.071), and 50%, respectively (2.275). Indeed, the expected value obtained is not the same as the comparison value. The contractor can prepare the necessary resources by knowing the value of the expected yield at a certain percentage of the duration. 
Effect of Adding Fly Ash and Rice Husk Ash on Compressive Strength to Meet the fc'35 MPa Concrete Quality Mardiaman Mardiaman; Hikma Dewita
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 7, No 1 (2022): March
Publisher : Litbang Pemas - Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v7i1.778

Abstract

Portland cement usage has increased, leading to substitute materials being sought. The composition of the concrete mix material affects its strength. Concrete compressive strength is usually determined in 7, 14, 21 and 28 days. This study determined the compressive strength of concrete at variations of 28, 35, 42 and 49 days. The attained compressive design strength was fc'35 MPa from the variation of the mixed materials. The compressive test results based on the variation were above fc'35 MPa. The two substitute materials meet the strength requirements. The addition of fly ash and rice husk ash decreased the compressive strength of concrete at 28 days. The compressive strength of regular concrete and with additional materials is more than 35 MPa. Adding fly ash and rice husk ash by 20% still resulted in the compressive strength of concrete above 35 MPa, namely 36.78 MPa and 35.04 MPa.
Co-Authors Edward Kusuma Hikma Dewita