Solutions for safer, more durable infrastructure are required in light of increasing traffic and severe weather in Iraq. The most significant road conservation and maintenance challenges are the pavement's low resistance to dynamic loads and short service life. As a result, vast sums of money are spent annually to enhance the road service capacities in Iraq. Thermoplastic electrometric polymers for bitumen modification create long-lasting, cost-effective roadways. This study aims to determine how the mechanical properties of neat asphalt binder change when styrene butadiene styrene (SBS) is added as a modifier. The current research investigates adding three percentages of SBS (3, 5, and 7% of the weight of bitumen). Both neat and polymer-modified bitumen (PMB) were subjected to a series of physical laboratory and Superpave tests, including a dynamic shear rheometer tester (DSR) and a storage stability test. In addition, a chemical analysis test was conducted to identify any change in the neat binder chemical composition due to the addition of SBS polymer. The results indicated that 5% of SBS polymer was the optimum addition percentage to the local asphalt in Iraq. Additionally, it reduced the susceptibility of bitumen to temperature changes and enhanced its characteristics in all laboratory tests. The obtained PMB significantly improved rutting and fatigue factors compared to the neat asphalt binder. Based on the DSR tester and the storage stability test, the ratio of 5% SBS met the requirements of class PG76-10, used in the central and southern governorates of Iraq. Using SBS polymer on the surface course in Iraq reduces road damage due to the scorching summer sun, reduces the likelihood of rutting and fatigue cracking, and works well in hot regions, resulting in roads that last longer, provide comfortable riding, and require less maintenance.

The disposal of waste scrap tires is one of the most important challenges and a massive burden facing the developed countries. One of the most important method to disposal it, is using the Crump Rubber (CR) of tires in roads and structural projects. The current research focused on assessing the performance of concrete pavement contained CR. The mechanical properties of concrete were evaluated after adding 5 percentages of CR particles as 2%, 4 %, 6 %, 8% and 10 % of total weight of aggregate. The work methodology involved investigation the effect of using different methods of treatment of CR compared with untreated CR. Also, it investigated the effect of CR particles’ sizes on the mechanical properties of rubberized concrete pavement. The results of study showed that the chemically treated CR can produce rubberized concrete pavement with properties closed to that of reference mix. The replacement with 2% and 4% CR gave adequate properties of pavement to be used in highway construction, while the 6% is closed to acceptable limit. The coarser particles showed better performance in terms of mechanical properties compared with the smaller particles (as replacement from sand). Chemically treatment by NaOH for CR only caused reduction in compressive strength of concrete by 7.6%, 15% and 28% while water soaking method produce more reduction in compressive strength reached up to 52.5%, 55.1% and 65.8% for the percentages of 2%, 4% and 6% CR respectively.

In last years, a new type of pavement has gained popularity, this type is called Semi-Flexible Pavement (SFP). It consists of porous asphalt with high air voids between (25-35) % filled with cementitious grout materials. This type of pavement substance offers substantial advantages over both common types of pavements (concrete and flexible) such as good resistance to rutting and durability. SFP is considered an alternative pavement to exceed the drawbacks that occur for both flexible and concrete pavements. SFP has good features against permanent deformation, oil spillage, and fatigue resistance. Previous studies have shown that it can be used in a variety of applications such as highways, motorways, bridge deck pavement, tunnels, industrial areas with industrial equipment traffic, airport aprons, and stations. The goal of this research is to identify and compile the most significant research papers using the Web of Science (WOS), analyze the data using the VOS viewer software, as well as learn which countries and institutions had published the most articles relating to the subject of cementitious grout material as it relates to semi-flexible. It was also done to learn more about the authors and their collaboration. In addition to knowing the keywords that will aid researchers in their research on this topic, using these studies to better understand the elements that affect how well semi-flexible mixtures and grouts perform such as porous asphalt Mixture gradation and grout material components.