Use of Thermostone Waste Aggregates for Internal Curing of Reactive Powder Concrete

Abstract

The concrete need curing for cement hydration that is a chemical reaction in each step require water supply throughout the time period. The traditional concrete cured by external method that prevents the concrete surface dry so that keeping the concrete mixture wet and warm. The internal curing was adopted in normal and high strength concrete such as reactive powder concrete. In present paper, experimental approach is to study the mechanical properties of reactive powder concrete cured internally with thermostone material. The materials that adopted to evaluate and find out the influences of the internal curing on the mechanical properties of reactive powder concrete is focused with different curing methods such as in water, air and combined water and air. Thermostone aggregate are used as partial sand replacement by volume with different percentages to explore the percentage that effects of the concrete mechanical properties. Test results showed that the best partial replacement by thermostone is 5% gave enhancement and increase in compressive strength and flexural resistance strength (modulus of rupture) and concrete density. Highest increasing of compressive strength is 10.07in case of 5% partial replacement at 90 days. In case of cured the specimens up to 90 days, the increase in modulus of rupture is 4.53%

Improving the Thermostone Properties by Treating with Some Additives

“…The strength increases when adding 0.12% of aluminum with an increase in porosity to 75% and aluminum can be produced to reduce the cost of producing thermostone from aluminum exhaust. Table (7) and Figure (13) shows the relationship of pressure and aluminum powder and shows Figure (14) The relationship of porosity of aluminum powder as Figure (15) shows the relationship of density to aluminum powder. By studying the results of this replacement, it was found that it achieves the following: 1.…”

“…The temperature rises. Heat when mixing so wait before chopping [15]. The traditional mixture consists of the following materials, with a density of 600 kg / m3 showed in Table (2) [15].…”

Potential Use of Wastes of Thermostone Blocks and Ceramic Tiles as Recycled Aggregates in Production of Foam Concrete

“…It could absorb water through preparation and mixing and thereafter progressively liberate water trapped within the mixture during the hardening stage. Additionally, this aggregate's coarse pore structure and rough particle surface can help cement paste and aggregate interlock in these transition zones (interrelated surfaces), so the hydration degree was promoted and the pores were filled by hydrates, resulting in enhancing the matrix density [23,52].…”

The Effect of Different Curing Temperatures on Properties of Reactive Powder Concrete Reinforced by Micro Steel Fibers

“…Researchers led by Richard and Cherezy at Bouygues in Paris, France, created RPC for the first time in the early 1990s. The Sherbrook Bridge, the country's first RPC structure, was built in July 1997 (Richard and Cheyrezy, 1994;Gawad et al, 2021). RPC is only used in confined locations because of a high production cost.…”