Lightweight aggregate micro-expansion anti-cracking concrete with adjustable expansion performance

• Main Authors: LIN ZHIHAI, OU GUANGFENG
• Format: Patent
• Language: Chinese; English
• Published: 24.05.2022
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

The invention relates to lightweight aggregate micro-expansion anti-cracking concrete with adjustable expansion performance, which is prepared by mixing and stirring cement, aggregate, an expanding agent and water according to a mixing ratio with compressive strength of less than 100MPa, part of the aggregate is replaced by the lightweight aggregate with the same volume, the replacement rate is 5-100%, and the expansion performance is adjustable. The expanding agent comprises at least one of a calcium sulphoaluminate expanding agent, a calcium oxide expanding agent and a magnesium oxide expanding agent. The method has the advantages that the internal tensile stress caused by the coupling effect of temperature shrinkage, autogenous shrinkage and drying shrinkage in the concrete is effectively reduced, so that the generated crack can be effectively controlled, the maximum width of the crack appearing in the concrete is reduced, the crack gap is reduced, and the number of the crack is reduced. The novel magnesiu