A5007394529- Asphalt Pavement Performance Evaluation
- Infrastructure Maintenance and Monitoring
- Natural Fiber Reinforced Composites
- Grouting, Rheology, and Soil Mechanics
- Polymer Nanocomposites and Properties
- Microbial Applications in Construction Materials
- Geotechnical Engineering and Underground Structures
- Innovative concrete reinforcement materials
- Polymer composites and self-healing
- Nuclear and radioactivity studies
- Radioactivity and Radon Measurements
- Polymer crystallization and properties
- Tribology and Wear Analysis
- Graphite, nuclear technology, radiation studies
- Phase Change Materials Research
- Advanced Cellulose Research Studies
- Microplastics and Plastic Pollution
- biodegradable polymer synthesis and properties
- Fiber-reinforced polymer composites
- Material Properties and Processing
South Eastern Kenya University
2018-2024
Wuhan University of Technology
2017-2019
Kenyatta University
2013
Graphene oxide (GO) has a unique layered structure with excellent gas and liquid blocking properties. It is widely used in many areas, such as sensors, carbon-based electronics, impermeable membranes, polymeric composite materials. In order to evaluate whether GO (1% 3% by weight of asphalt) can improve the aging resistance performance asphalt, 80/100 penetration grade asphalt (90 A) styrene–butadiene–styrene modified (SBS MA) were prepare melt blending method. The surface morphology was...
This paper investigated the rheological properties of asphalt binder, mastic and mortar interaction between mineral filler fine aggregates. Asphalt can be regarded as binding phase at different scales in concrete. is a blend binder smaller than 0.075 mm while consists aggregate 2.36 mm. The material compositions were determined from commonly used mixtures. Dynamic shear rheometer was to conduct analysis on mortar. obtained test data complex modulus angle for construction master curves...
This study investigated the effect of seven healing agents on crack ability long-term aged asphalt and its mortar. Different including sunflower oil, aromatic bitumen emulsion, maltene-based emulsions were used. The made use two disk samples was evaluated using direct tensile tests. For mortar, notched semi-circular Test results indicated that mortar depended strongly type agent. In general, healed faster than Asphalt could be well improved by oil agents, while with emulsions. developed...
Styrene butadiene rubber latex (SBR), waterborne epoxy adhesive (WE) and colloidal silica sol (SiO2) were used to prepare modified bitumen emulsion for cold mix asphalt. The modification effects of the individual modifiers combination these investigated by using bonding strength dynamic shear rheological property. Test results showed that modifier dosage helped balance performance improving its without compromising properties. critical at which peak occurred was 4%, 12% 4% SBR, WE SiO2...
Low density polyethylene (LDPE) is an important industrial material because it durable, light-weight, easily processed and characteristically inert, but its everyday use hazardous to the environment. The solution this seems consist of incorporation biopolymers in structure LDPE form composites. Compression molded composites at different cellulose loading were subjected creep tests 30, 40, 50, 60°C. samples displaced for 12 minutes allowed recover minutes. Creep behavior polymer was governed...
The sensitivity of fracture-based healing indexes asphalt mixtures was evaluated using a semicircular bending test following multiple fracture-rehealing method. Five agents (HAs) were applied on the cracks to promote healing. Test results indicated that pre- and postpeak material fracture response properties recovered different values Prepeak such as peak index (PI), stiffness (SI), toughness (TI) insensitive properties, they showed higher compared with energy (EI). Nonetheless, EI, which...
Abstract This study used gamma ray spectrometry to determine the radiological safety of construction soil sampled randomly from Mbeere North region, Kenya. The mean activity concentration 232Th, 238U, and 40K was 149.7 ± 2.8 Bqkg−1, 88.3 2.4 490 35 respectively. These averages exceed world average for all radionuclides. radionuclides were non-uniformly distributed, with higher concentrations along slopes on feet hills. absorbed dose rate, indoor outdoor annual effective dose, radium...
This study investigated the long-term crack healing of asphalt mixtures treated with agents (HAs).Five were applied on fractured surfaces and performance was evaluated based restored peak strength fracture energy.Long term predicted using Modified Wool O'Connor model, a modified Avrami model prediction proposed in this study.Test results indicated that could predict mixtures.Crack comprised an instantaneous component time dependent component.The attributed to wetting adhesion onto...