Property Evaluation of Cement-Stabilized Macadam Modified via Phosphorus Slag Materials

Abstract

Phosphorus slag, known as the waste product of the phosphate ore industry, is causing critical environmental issues due to its direct exposure to natural spaces. In this article, a partial replacement of the natural fine aggregate ordinarily used in cement-stabilized macadam (CSM) base by phosphorus slag was explored to be an effective solution for phosphorus slag waste. CSM specimens were fabricated by adding various dosages of phosphorus slag particle and fine powder, whereas the optimum moisture content and maximum dry density were analyzed through compaction tests. Compressive strength, bending tensile strength, fatigue life span, dry shrinkage, and temperature shrinkage performance at different curing durations were investigated to evaluate the properties of modified macadam. Results show that phosphorus slag reduced the early compressive strength of CSM to a small extent, but the compressive strength finally increased at 90 days’ curing. The modified slag particles and slag fine powder exhibited different behaviors to repeated loading, moisture loss, and temperature difference. Finally, according to the strength change, fatigue performance comparison, and shrinkage strain caused by the incorporation of phosphorous slag materials into the CSM, it was verified that 25% of the particles to 40% of the fine powder is the best replacement ratio.

Effect of Calcination Temperature of Dolomite on Properties of Self-insulation Wall Materials

“…The initial use of exterior insulation systems in Europe was to compensate for the cracks existing in the wall, while it was later found that exterior insulation systems not only solved the wall cracks problem, but also reduced the building energy consumption and improved the building insulation performance, which is because the composite wall has good insulation performance and heat insulation performance [5]. Serres in France studied a new wall material, COB block, with low LCC, and showed that traditional materials can be used on modern buildings by studying the thermal properties of COB blocks compared with ordinary concrete insulated block walls [8]. At present, the research on new wall materials, especially self-insulation blocks, is increasing in China.…”