Abstrak. This study aims to determine the effect of rice husk ash (RHA) as an ingredient added to mortar to the setting time and compressive strength of mortar. The article also studies about the effect of the sulfuric acid solution on the setting time and compressive strength of mortar. Quantitative research using an experimental approach to making mortar samples at various RHA levels is 0%, 3%, 6%, 9% and 12%, each of the 16 test objects. The mortar properties tested setting time and compressive strength. The results of the analysis show that the using of RHA in mortar production caused the shorter of setting time. The compressive strength of mortar at 6% variation produces optimal results. The compressive strength of ordinary mortar at 28 days was 6 MPa, while the maximum compressive strength of 6% variation was 6.25 MPa. The use of pH4 a water causes differences in setting time and mortar compressive strength. The acidity of the mixing water causes the cement to bind faster but causes a decrease in the compressive strength of the mortar.

The Effect of Addition of Waste Strapping Band on Gap Graded Concrete

The research aims to find out the source of garbage from various object activities and find out the waste management system at Sultan Hasanuddin International Airport, Makassar South Sulawesi Indonesia. The study was conducted in September 2015 at Sultan Hasanuddin International Airport in Makassar, South Sulawesi through a survey in the form of interviews, direct observation. Taking and measuring samples at places where there are human activities and points that are considered to represent samples, such as in public services. The focus of research is on the Land Side of the Airport based on the SNI 19-3964-1994 method. which is used in this research is a quantitative approach by calculating the weight and volume of waste generation from each sample point. Of the ten samples observed, the waste generation was obtained at; check in area 74.8 ltr, departure area 20.06 ltr, arrival area 46.8 ltr, public service 96.6 ltr, service office 2.42 ltr, luaggage 52.4 ltr, cargo 208 ltr, minimarket / café 87.3 ltr, restaurant 155.3 ltr and vehicle parking 231.4 ltr. The waste management system is carried out through the 3R method; namely Reduce: 27.29% waste management, Reuse: 36.37% waste management, Recycle: 33.7% waste management and the remaining 2.64% waste is disposed of to landfills.

The functional relationship between the intensity of spatial use floor area ratio (FAR) and road network performance is fundamental in the context of rapid urban development. This study aims to quantify and model the spatial relationship between the actual FAR, deterioration of road performance-degree of saturation (DS) and side barriers (HS), on the main road corridor of Parepare City, using a deductive quantitative approach. The analysis begins with the collection of FAR and DS data referring to Indonesian road performance guidelines (PKJI, 2023), followed by the estimation of a Spatial lag regression model (SLM) to internalize the dimensions of spatial dependence. SLM model shows strong explanatory power (R 2 = 0.78), empirically confirming a positive and significant correlation between improvement FAR and DS. A key finding is the validation of a significant positive spatial autocorrelation (ρ = +0.387, p < 0.01), which proves that congestion is the result of spillover effects between connected segments, not an isolated phenomenon. These results justify that traffic interventions should be network-based. Furthermore, this study applies predicted scenarios of FAR increase (+10%, +20%, and maximum zoning limit 4.0). The results of this scenario are crucial, increasing FAR to the maximum zoning limit drastically predicts total functional failure in most segments (predicted to reach LOS E and F), especially in residential zones that show the highest FAR sensitivity (β F ARtotal = +0.200). The main contribution of this study is to provide an adaptive model to determine FAR based on a critical performance threshold (DS max = 0.75). Policy implications recommend a holistic integration between spatial planning and transportation regulations, demanding an immediate revision of the maximum FAR limit (as mandated on the priority map) to a sustainable FAR, as well as the implementation of network-based mitigation strategies, rather than point-based, to manage the urban mobility crisis sustainably.