Abstract: A method of dusting-preventive treatment in which a powder having dusting property is treated with fibril-forming PTFE (polytetrafluoroethylene) to impart non-dusting property thereto and the non-dusting property of the powder, after having been reduced during transportation, are economically and advantageously recovered or improved through a relatively simple step. The method comprises: a first dusting-preventive treatment step in which fibril-forming polytetrafluoroethylene is added to a powder having dusting property, and a compression/shear force is exerted to the mixture at a temperature in the range of 20 to 200° C. to thereby regulate powder so as to have a flow value of 150 mm to 200 mm; and a second dusting-preventive treatment step in which a compression/shear force is exerted again at a temperature in the range of 50 to 150° C.

Abstract: A vehicular test course surface is provided which permits tests to be conducted in a snow-covered road condition no matter in which season the tests may be conducted. Snow is made to fall or accumulate like artificial snow onto a road surface.

Abstract: Provided is a method for recovering a slip resistance value of a basalt-tiled road surface by treating with an acid solution.

Abstract: The present invention provides a dusting-inhibited cement composition, which hardly forms dust and further capable of improving strength of concrete or mortar obtained therefrom. A dusting-inhibited cement composition according to the present invention comprises 100 weight parts of cement, 0.01˜0.1 weight parts of fibrillatable polytetrafluoroethylene and 0.001˜1.0 weight parts of alcohol base antifoamer and/or silicone base antifoamer.

Abstract: A paving mixture excellent in mixing property and compacting property, which relaxes temperature condition conventionally required for a paving mixture, and can maintain certain quality and durability even if blending ratio condition conventionally required for an aggregate is relaxed, is provided. A paving mixture wherein a constituent binder is so prepared that a minute bubble particle is produced and kept in the binder when the mixture is mixed with heating or compacted.

Abstract: Dust-control treatment of dusty powder, which mainly passes through a 100 mesh sieve, such as pigment and fertilizer, is achieved by, firstly blending the dusty powder with fibrillatable polytetrafluoroethylene and a pair of materials capable of initiating an exothermic reaction upon contact, and then subjecting the blended material to compression-shear under the exothermic reaction and raising the temperature of the blended material to 50.degree.-300.degree. C. The polytetrafluoroethylene fibrillates during the compression-shear and the formed fibrils enclose the dusty powder to turn it to a dust-controlled one.

Abstract: A measuring arm (12) is attached to a frame (5a) supporting a screed (5). Height sensors (13) and (14) are attached to the measuring arm (12), and a height sensor (19) is also attached to the arm (18) of the screed (5). The spacing must remain constant between the rear end of the screed (5) and the height sensor (19), between the height sensor (19) and the height sensor (14), and between the height sensor (14) and the height sensor (13). A distance sensor to calculate the travel distance is provided on the tractor unit (1). The relative height Ho of both height sensors (13) and (14) to the screed (5) must always remain constant, regardless of the tilt of the screed (5) and the measuring arm (12). The sensors (13), and (14), and (17) are connected to the arithmetic unit (30). The height sensor (19) is connected to the arithmetic unit (40). The arithmetic unit (30) receives an output signal from the height sensors (13) and (14) and calculates the thickness of the pavement.

Abstract: It is an object of the present invention to provide a soil-stabilizing agent with less emission of dust, good reactivity, good behavior at mixing and good dispersibility and a method for soil stabilizing treatment capable of restraining the emission of dust in the procedure of sprinkling and mixing of the soil-stabilizing agent to soil.The soil-stabilizing agent according to the present invention comprises a mixture of a material mainly composed of quick lime and/or calcined dolomite and fibrillatable polytetrafluoroethylene resin.And the method for soil-stabilizing treatment according to the present invention comprises the following steps; adding a mixture of a material mainly composed of quick lime and/or calcined dolomite and fibrillatable polytetrafluoroethylene resin to soil, and mixing them under the hydration heat generated by the reaction between the quick lime and/or calcined dolomite with moisture in the soil to form hydrated material.

Abstract: It is an object of the present invention to provide a soil-stabilizing agent with less emission of dust, good reactivity, good behavior at mixing and good dispersibility and a method for soil stabilizing treatment capable of restraining the emission of dust in the procedure of sprinkling and mixing of the soil-stabilizing agent to soil.The soil-stabilizing agent according to the present invention comprises a mixture of a material mainly composed of quick lime and/or calcined dolomite and fibrillatable polytetrafluoroethylene resin.And the method for soil-stabilizing treatment according to the present invention comprises the following steps; adding a mixture of a material mainly composed of quick lime and/or calcined dolomite and fibrillatable polytetrafluoroethylene resin to soil, and mixing them under the hydration heat generated by the reaction between the quick lime and/or calcined dolomite with moisture in the soil to form hydrated material.

Abstract: A modifier for paving asphalt, which comprises Trinidad Epure having a maximum size of less than 25 mm and a pulverulent solid having a maximum size of less than 2.5 mm, the powder comprising essentially a substance having a higher softening point than Trinidad Epure and compatibility with paving petroleum asphalt, wherein the volume of the powdery solid is 0.8 to 2.8 times the void volume of the granulated Trinidad Epure when in the stored state.

Abstract: A leveling device for an asphalt finisher or the like including a pair of screeds disposed at front and rear portions of the device on auxiliary frames which are slidably coupled to a main frame. The main frame is pivotably mounted to a pair of supporting arms extending from the vehicle body. The screeds are both movable laterally and tiltable sidewards so that a predetermined depth of asphalt coating can be attained and a crown portion provided if desired.