摘要:
본발명은산업폐기물인플라이애시(fly ash)와알칼리활성화제를이용함으로서, 고온에서진행되는소성공정을수행하지않고서도우수한물성을가지는인공적인구형(球刑)의경량골재(輕量骨材)를제조하는방법과, 이러한방법에의해제조되는경량골재에관한것이다. 본발명에서는플라이애시를이용하여인공경량골재를제조하는방법으로서, NaOH 및 KOH 중에서 1종이상을선택하여농도 6 내지 12M이되도록만든수용액으로이루어진알칼리활성화제를플라이애시분말에분사하여혼합하고; 상기플라이애시분말과알칼리활성화제의혼합물을조립기를이용하여입상의성형체로만들고; 입상의성형체를섭씨 50 내지 90도의조건에서 6 내지 24시간양생시켜서입자의크기가 5mm 이하이고, 비중이 1.5 내지 2.0인구형의인공경량골재가되도록하는것을특징으로하는인공경량골재제조방법과, 그에의해만들어지는인공경량골재가제공된다.
摘要:
PURPOSE: A method and device for measuring moisture content using multiple phase difference microwaves are provided to quantitatively measure moisture content with respect to a specimen and to perform a measurement with the high reliability in which noise is removed. CONSTITUTION: A method for measuring moisture content using multiple phase difference microwaves is as follows. Multiple phase difference microwaves composed of basic receiving waves(S1) and phase difference oscillation transmission waves(S2,S3) are irradiated to a measurement specimen, thereby making pass through. The basic receiving waves are composed of microwaves having an amplitude(E) and frequencies. The phase difference oscillation transmission waves having the same amplitude and frequencies with the basic receiving waves are composed of a plurality of microwaves having a phase difference in an oscillation. The amplitudes with respect to each receiving wave are measured by detecting the receiving waves corresponding to the basic receiving waves have passed through the measurement specimen and a plurality of the phase difference oscillation transmission waves. The measured amplitude values of the receiving waves are taken an average so that average amplitude of the receiving waves is obtained. An amplitude difference value of the receiving waves received by irradiating the basic receiving waves to the specimen of an identical sort in the state of being absolutely dried and the average amplitude is calculated. The receiving waves in which the frequencies and amplitude in an ideal state are known are irradiated to reference specimens of the identical sort with the measurement specimen in which the moisture content is known and measures a change of the amplitude by irradiating the identical receiving waves to the specimen of an identical sort in the state of being absolutely dried. The amplitude difference value are multiplied by a proportional constant known in advance using a relation of the moisture content and amplitude change of the reference specimen so that the moisture content of the measurement specimen is measured.
摘要:
The present invention provides a fly ash concrete composition which includes 100 wt% or greater of fly ash relative to the weight of cement, wherein the fly ash has 30 wt% of particles with a blaine fineness of 3,500-4,000 cm2/g and a diameter of 10 micrometers of less. The fly ash concrete composition according to the present invention improves early strength measured after pouring concrete by 35% or more compared with an existing fly ash concrete composition. [Reference numerals] (AA) Mortar strength ratio compared to existing fly ash; (BB) Mixing ratio in a diameter of 10 mm or less
摘要:
PURPOSE: An apparatus for measuring relative humidity in a concrete having moisture condensation prevention function is provided to prevent error generation in measuring the relative humidity due to moisture condensation, and to measure the relative humidity in the concrete accurately. CONSTITUTION: An apparatus for measuring relative humidity in a concrete having moisture condensation prevention function includes a sensor part (100) and a moisture condensation prevention member (300). The sensor part measures relative moisture by changing electrical characteristics of an electrode when the sensor part is exposed to water molecule. The humidity condensation prevention member comprises a main body (303) and a moisture-permeable and water-proof fiber (301). The main body is installed to surround the outside of the sensor part, and comprises a through-hole connected to the outside. The moisture condensation prevention member passes water molecules through the through-hole so that the water molecules are flowed into the inside, but is installed not to pass the water through the through-hole by blocking the through-hole.
摘要:
PURPOSE: A vacuum saturation apparatus is provided to automatize saturation process of concrete and saturate plural concrete pieces. CONSTITUTION: A vacuum saturation apparatus(100) of concrete comprises: a container(110) containing concrete; a transport part which has a lid(121) of the container and a cylinder member and closes and opens the opening part of the container; a vaccum part which is connected to the lid; and a water supply tank for supplying water to the container.