• Effect on the hardness paving block by adding gomuti and pumice stone.

      Rochman, Zainur; Mudjanarko, Sri Wiwoho; Harmanto, Dani; University of Derby; Universitas Narotama (Industrial Engineering and Operations Management Society (IEOM), 2018-03)
      Paving block is a cement product and been used as the alternative of asphalt. It has been used intensively for parking area, village road and so on in Indonesia. Paving block is also known as concrete block or conblock. Absorption of water to paving block installation system can maintain ground water balance and strongly support go green. It is also echoed nationally as well as internationally. This research will test the compressive strength of paving block considering the paving block function must also be able to support the heavy load on it beside the good absorption. The development and test will be using two types. First, it will be added the fibers of gomuti 3% and pumice stone 10% with additional aggregate 1.5% sikament additive. The second one will be the same but increasing the pumice stone to 20%. This research is expected to get paving block wearing high and light.
    • Substitution local resources basalt stone scoria Lampung, Indonesia, as a third raw material aggregate to increase the quality of portland composite cement (PCC).

      Rajiman; Alisjahbana, Sofia W.; Riyanto, Hery; Hasyim, Cholil; Setiawan, M. Ikhsan; Harmanto, Dani; Wajdi, Muh Barid Nizarudin; Tarumanagara University; Lampung University; Bakrie University; et al. (Science Publishing Corporation, 2018)
      Domestic cement demand is increasing in line with the increase of development of property sector and construction sector. Cement is one of the important components in making a permanent building. The function of cement in a construction is as an adhesive material that affects the strength of a building. The process of making cement is divided into two groups, namely hydraulic cement and non-hydraulic cement. Hydraulic cement consists of Portland type cement and PCC type cement, PPC cement and slag cement. The type of PCC cement (Portland Composite Cement) is produced from grinding clinker with gypsum with the addition of third raw material. The purpose of this research is to know the effect of cement quality improvement with substitution of basalt scoria stone raw material as much as 0-10% as the third raw material. The source of basalt scoria stone originated from Lampung Timur, Indonesia. The fineness test showed cement fineness was 2983-3665 cm2/gr with minimum SNI standard 2800 cm2/gr. Residue test meets the requirements of SNI standard that is equal to 16,07% -18,55%. The compressive strength test was performed at ages 3, 7 and 28 days and obtained the result that the optimum compressive strength produced was 235, 314, 394 kg/cm2. Basalt rock usage as substitution material in cement production can decrease environmental pollution caused by clinker production. Based on the cost estimation analysis, the use of basalt stone can decrease the production cost which impact on the increase of profit