Abstract:
A pavement planarization apparatus is provided, which can obtain excellent flatness of the packing road surface and enables to perform planarization work easily. A pavement planarization apparatus comprises: a roller(10) which is installed to be moved while being rotated in the construction road(4) in which the pavement material(2) is poured; a roller guide(20) which is installed at the construction road side in the traveling direction of the roller, supports the roller and guides the rotation movement of the roller; and a roller supporter(30) which is combined to support the roller and is coupled with a roller guide.
Abstract:
A repair method for a joint of a road pavement is provided to obtain a pavement slab having long-term strength and durability by having excellent adhesive strength with the existing pavement. A repair method for a joint of a road pavement comprises the steps of: setting up the cutting width on two sides of a damaged joint; setting up the cutting thickness on the lower part of the damaged joint; crushing a road pavement according to the set cutting width and cutting thickness; cutting the crushed road pavement by spraying high pressure water using a high pressure water sprinkler(100) having a spray nozzle; cleaning the cutting surface by the high pressure water; placing concrete on the cleaned surface; and finishing the surface of the concrete to make the surface of the concrete level with the existing pavement.
Abstract:
An apparatus for measuring autogenous shrinkage of concrete is provided to measure the autogenous shrinkage by the variation of the probe of a measuring instrument, resulting in deeper analysis of the concrete characteristic. An apparatus for measuring autogenous shrinkage of concrete includes a prop(100), a concrete container(200), a shrinkage measuring instrument(300), and a measuring assistant member. The concrete container is installed on the prop, and has a hole on the upper part and measuring instrument insertion holes(210) on the sidewall. The shrinkage measuring instrument is installed on the prop, and has a probe(310) contacted with the concrete in the concrete container through the measuring instrument insertion hole. The shrinkage measuring instrument measures autogenous shrinkage of concrete by the variation of the probe. A part of the measuring assistant member is buried in the concrete and the other part is exposed through the measuring instrument insertion hole to be in contact with the shrinkage measuring instrument.
Abstract:
An early hardening cement composition having lowered flow decrease for latex-modified concrete is provided to show practical strength in 3 hours as well as guarantees sufficient work time. An early hardening cement composition for latex-modified concrete comprises 0.1 to 1.5 parts by weight of set-controlling agent, 0.1 to 3.0 parts by weight of hardening accelerator and 0.3 to 1.5 parts by weight of dispersant with respect to 100 parts by weight of a composition comprising 20 to 60% by weight of powder pulverized to have 4,000 to 7,000cm^2/g of Blain specific gravity weight from Hauyne clinker, 30 to 55% by weight of Portland cement and 5 to 25% by weight of gypsum. The Hauyne clinker used in the composition comprises 40 to 70% by weight of 3CaO3.Al2O3.CaSO4, 15 to 40% by weight of 2CaO.SiO2 and 1 to 10% by weight of free CaSO4. The set-controlling agent comprises one or more selected from a group consisting of citric acid, tartar acid, gluconic acid, boric acid, heptonic acid and metallic salts thereof. The hardening accelerator comprises one or more selected from a group consisting of slacked lime, and alkaline metallic salts of carbonic acid, nitric acid and nitrous acid. The dispersant comprises one selected from a group consisting of naphthalene sulphonates, polycarbonates, lignin sulphonates and melamine condensates.
Abstract translation:提供乳胶改性混凝土的降低流动减少的早期硬化水泥组合物,以在3小时内显示实际强度,并保证足够的工作时间。 用于胶乳改性混凝土的早期硬化水泥组合物包含0.1至1.5重量份的固化剂,0.1至3.0重量份的硬化促进剂和0.3至1.5重量份的分散剂相对于100重量份的 组合物包含20至60重量%粉碎的粉末,其具有4,000至7,000cm 2 / g来自Hauyne熟料的Blain比重重量,30至55重量%的波特兰水泥和5至25重量%的石膏。 组合物中使用的Hauyne熟料包含40至70重量%的3CaO 3 Al 2 O 3 .CaSO 4,15至40重量%的2CaO.SiO 2和1至10重量%的游离CaSO 4。 所述控制剂包含选自柠檬酸,酒石酸,葡萄糖酸,硼酸,庚糖酸及其金属盐中的一种或多种。 硬化促进剂包括选自松弛石灰和碳酸,硝酸和亚硝酸的碱金属盐中的一种或多种。 分散剂包括选自萘磺酸盐,聚碳酸酯,木质素磺酸盐和三聚氰胺缩合物中的一种。