摘要:
Use of at least one corrosion-inhibiting additive to reduce the production of hydrogen via corrosion of magnesium metal conditioned in a cement matrix is provided. Also provided is a material for conditioning magnesium metal given such use and its method of preparation.
摘要:
Methods of reducing hydroxyl ions in concrete pore solutions are provided. Such methods are useful in providing resistance to gels which form in concrete due to the alkali-silica (ASR) reaction. The methods comprise, in one aspect, adding a salt to the concrete, in aqueous or solid form, the salt having a cation higher in valence than the anion. In other aspects, the methods of the present invention comprise adding an acidic phosphate or a silicon-containing alkoxide to the concrete. All of the above methods are useful in reducing hydroxyl ions in concrete. Such methods can be used to prevent ASR in fresh concrete, or to remediate ASR in hardened concrete.
摘要:
Hardenable foam compositions comprising oxygen-releasing foaming agents, a hardener consisting of an alkali silicate solution, a fine particle solid material which reacts with said hardener, namely an oxide mixture consisting of SiO.sub.2 and Al.sub.2 O.sub.3 extracted from a filter dust, an electrofilter ash from high-temperature power plants, and calcinated bauxite or amorphous silica, to which reaction accelerators are added, are improved, firmer, faster hardening foams. Reducing agents, in particular sulphur compounds with a reducing action are preferred. Oxidizing agents or fine particle substances such as soot or color pigments are effective.
摘要翻译:包含脱氧发泡剂的硬化泡沫组合物,由碱金属硅酸盐溶液组成的固化剂,与所述固化剂反应的细颗粒固体材料,即由过滤灰尘提取的由SiO 2和Al 2 O 3组成的氧化物混合物,来自高温的电过滤灰 温度发电厂和加入反应促进剂的煅烧铝土矿或无定形二氧化硅得到改进,更坚固,更快的硬化泡沫。 还原剂,特别是具有还原作用的硫化合物是优选的。 氧化剂或微粒物质如烟灰或彩色颜料是有效的。
摘要:
Chromite by-products having a composition which includes FeCr.sub.2 O.sub.4 as well as iron, aluminum, magnesium, sodium, calcium and silicon oxides are directly mixed with cement mortar and with the aggregates on use, or added to the water, producing the effect of corrosion inhibition of the steel reinforcements.
摘要:
A concrete material that includes an elastomeric polymer in an amount sufficient to provide flexibility to the resultant material; a silicone resin in an amount sufficient to improve adhesion between the elastomeric polymer and the cement; a cement that has low shrinkage and expansion properties; a filler; and water in an amount sufficient to cure the cement and form the concrete material. The polymer is present in an amount which fills at least some of the pores in the material and the silicone resin helps the polymer bond the filler to the cement. Also, a concrete material property improving additive in the form of a polymer admixture that includes the elastomeric polymer, a silicone resin and at least one solvent in an amount sufficient to form a viscous flowable mass. Another embodiment is a method of forming a concrete material by forming and curing a mixture of the additive, a cement that has low shrinkage and expansion properties, a filler, and water in an amount sufficient to cure the cement. Another embodiment is a method of repairing a crack or fracture in a concrete or cement surface by cleaning surfaces of the crack or fracture to remove loose material and to create a cavity, applying the concrete material of the invention under pressure into the cavity, and allowing the concrete material to cure to repair the crack or fracture. The resultant repaired surface forms yet another embodiment of the invention.