Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan ISSN (Online) 2620-7222 Volume 06 Number 2 Year 2021 ISSN (Print) 2503-2399 213 The Effect Of Adding Cement Waste On The Quality Of Concrete Compressive https://doi.org/10.30736/cvl.v2i2 The Effect Of Adding Cement Waste On The Quality Of Concrete Compressive Asrul Majid 1 , Hammam Rofiqi Agustapraja 2 . 1,2 Civil Engineering Study Program, Faculty of Engineering, Lamongan Islamic University e-mail: 1 asrulmajid96@gmail.com, 2 hammamrofiqi@unisla.ac.id A R T I C L E I N F O A B S T R A C T Article History : Article entry : 2021-09-24 Article revised : 2021-12-09 Article received : 2021-12-11 The demand for concrete is increasing which causes the need for cement to increase as well. It can be seen from the raw material, cement is a type of concrete constituent material that is classified as a non-renewable natural resource. The authors conducted research on the effect of adding cement waste to the compressive strength of concrete. This study used an experimental method with a total of 24 test objects. The test object is in the form of a concrete cylinder with a diameter of 15 cm and a height of 30 cm and uses variations in the composition of the addition of cement waste cement as a substitute for fine aggregate, namely 0%, 2%, 4%, and 6%. K200). The compressive strength test was carried out at the age of 7 days and 28 days. The test results show that the use of waste as a partial substitute for fine aggregate results in a decrease in the compressive strength of each mixture. at the age of 7 days, the variation of 2% is 16.84 MPa, 4% is 11.32 MPa and for a mixture of 6% is 6.68 MPa. Meanwhile, the compressive strength test value of 28 days old concrete in each mixture decreased by ± 6 MPa. The conclusion is cement waste cannot be used as a substitute for fine aggregate in fc' 16.6 MPa (K200) quality concrete because the value is lower than the specified minimum. Keywords : Bearing Capacity, Foundation, CPT, SPT. IEEE Style in citing this article : [Heading citation] One, N. P., & Second, N. P. (Year). Article Title. Civilla : Universitas Islam Lamongan, v(n), Start page – End page. [heading citation contents] This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Allows readers to read, download, copy, distribute, print, search, or link to the full texts of its articles and allow readers to use them for any other lawful purpose. Available online at https://jurnalteknik.unisla.ac.id/index.php/CVL https://doi.org/10.30736/cvl.v2i2