Abstract: An aggregate (12, 16) is disclosed as including a core (12a) made at least partly of biochar (10, 14, 26, 28), and a shell (12b) encapsulating the core, the shell being made of ordinary portland cement (OPC) and ground granulated blast-furnace slag (GGBS). Structural concrete (30) including such an aggregate is also disclosed.

Abstract: High-strength, lightweight core-shell aggregates are formed from waste materials. The aggregates include porous core materials which may be one or more of perlite, vermiculite, cenospheres, expanded polystyrene, or biochar. Formed on the core materials is at least one layer of shell material which includes one or more of GGBS, fly ash, recycled concrete powder, recycled glass powder, or biochar powder. The high-strength, lightweight core- shell aggregates have a loose bulk density less than approximately 980 kg/m3, a crushing strength higher than approximately 4 MPa, a water absorption of less than 20%, and a carbon emission of approximately 181 kgCO2eq/t or less. Lightweight concrete is formed by incorporating the high-strength, lightweight core-shell aggregates with cement to create concrete with a density of 1900 kg/m3 or less.

Abstract: The present application relates to the technical field of road infrastructure, and provides a cement-based pervious pavement structure, a manufacturing method of the cement-based pervious pavement structure, and an application of the cement-based pervious pavement structure. The cement-based pervious pavement structure includes: a lower structural layer as the base; an upper surfacing layer overlaid on said lower structural layer and including: 1.0-2.0 parts by weight of upper layer (fine) aggregate; 0.40-0.70 part by weight of cement; 0.02-0.03 part by weight of titanium dioxide; 0.03-0.04 part by weight of water reducing agent; 0.001-0.002 part by weight of defoamer. The cement-based pervious pavement structure provided by the present application can provide air purification function taking into account the practical cost.

Abstract: A reclamation fill stabilizing composition for accelerated soil stabilization of high water-content waste soils/marine mud. The fill stabilizing composition includes a hydrolysis polymerization agent for chemically reacting with water in waste soil/marine mud. A gelling geopolymerization agent chemically and physically locks the water in its formed 3-D aluminosilicate microstructure. A sol-gel immobilization agent chemically and physically traps the water by reacting and bonding with the water. A nano-modification agent provides additional crystal nuclei to increase the effects of hydrolysis polymerization, gelling geopolymerization, and sol-gel immobilization. The reclamation fill stabilizing composition is mixed with high water-content waste soil such as marine mud. The marine mud is rapidly transformed into a compactable fill material within a stabilization curing period as short as 3 hours. Following stabilization, the treated marine mud is compacted (e.g.

Abstract: A nano-modified dry-mixed alkali-activated cementitious, or one-part geopolymer cement (OPgC), material with high early strength is provided for rapid repair of cement-based infrastructure components. The OPgC may include an aluminosilicate rich material, an alkali material and a nano-modifier, and optionally include other functional admixtures and fibers. The OPgC can be freshly mixed with water to obtain a repairing material. The OPgC may mix with water and fine or coarse aggregate to form mortar or concrete. The OPgC can be an alternative binding matrix for the development of an environmentally friendly and cost effective rapid repair material.

Abstract: An admixture for enhancing the durability of concrete to repeated freeze-thaw cycles is disclosed. The admixture comprises as an essential element a natural polymer material derived from millet. The admixture further comprises smaller quantities of naphthenic sulfate salt, triethanolamine and formaldehyde. In addition the admixture can improve concrete's impermeability and chloride ion binding capability.