## 8 Benefits  
HMA production is related to a high emission of hazardous compounds into the atmosphere. Studies show that the emission of asphalt gases and fumes is practically non-existent at a temperature of 80 \({}^{\circ}\)C. Their small share is present at temperature of 150 \({}^{\circ}\)C [8]. A decrease in mix asphalt production temperature means the reduction of carbon dioxide emitted by factories by approx. 40%, and, in the case of other hazardous compounds, by as much as 70% [12; 59; 60; 61]. A reduction of production temperature by only 10 \({}^{\circ}\)C decreases the emission of fumes and aerosols by as much as half [62].  
Studies of WMA with zeolite showed fume emission reduction of 75% with a temperature decrease of 26 \({}^{\circ}\)C. A 90% reduction in the emission of these compounds was noted during the process of embedding the mix [32]. Qualitative and quantitative environmental benefits resulting from using WMA with zeolite are presented in Table 4.  
Tests conducted in Ohio indicate that of the WMA technologies (Evotherm, Aspha-Min, Sasobit), the highest reduction in hazardous compounds is obtained using mix asphalt with zeolites [63]. Apart from the environmental benefits, a decrease in the emission of fumes and aerosols improves the safety and comfort of employees working with mix asphalt production and embedding.  
According to data from the literature, decreasing the temperature by 30 \({}^{\circ}\)C means a reduction in energy use of 9 kWh per 1 mg of finished mix asphalt [64]. WMA production takes 60%-80% of the energy required in HMA production [12; 65]. In the beginning phase of WMA use, the expenses incurred often exceed the savings resulting from lower energy use. This results from the necessity to adapt production facilities to new technology. For WAM-Foam technology, the facility modification cost amounts to $30,000-$70,000, whereas for Aspha-Min technology, the cost is $0-$40,000 [10]. The scope of investment expenditures depend mainly on the type of plants. At plants with continuous operation (used in the USA) it is easier to use water foaming technologies. The National Asphalt Pavement Association lists a few zeolite dosing methods which can be added using a number of feed systems [30]. At lower quantities of mix asphalt it is also possible to add zeolite packaged in paper bags, manually. From a long-term perspective, the use of warm mix asphalts is cost-effective.  
Assessing the efficiency of WMA technologies involves an estimation of the costs over the asphalt surface lifecycle. Prior studies indicate a 2.58% cost reduction over the entire lifecycle of the surface constructed using WMA technology with zeolite, with an 80% increase in surface durability. The addition of low (0.15%) and moderate (0.25%) amounts of zeolites was found to increase fatigue life; however, high dosages (0.35%) of additive negatively affected the fatigue life [66].  
The total reduction in aggregate extraction, gas emission and energy use was 13%-14% after adding 15% of aggregates derived through recycling [67]. According to the National Asphalt Pavement Association (NAPA) adding 25% RAP to WMA could potentially offset the pavement lifecycle greenhouse gas emissions by 15% to 20% [68].  
The analysis of a case study for WMA technology use (sasobit, Rediset WMX, and zeolite) performed by [PERSON] and [PERSON] shows that the lowest cost of constructing 1 km of asphalt surface was obtained for WMA with zeolite.  
A lower usage of components in a mix asphalt production facility is an additional benefit resulting from decreasing the production temperature [69]. Strict norms regarding the emission of hazardous compounds and high penalties for exceeding them also make WMA production a more attractive alternative with regard to traditional mixes.  
All of these benefits mean that the technology of WMA with zeolite addition is very attractive, both for investors and contractors.