• Title/Summary/Keyword: 액상형 혼화제

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Experimental Study of Freezing Characteristics and Antifreezing Method of Liquid Additive for Early Strength (액상형 조강제의 동결특성 및 동결방지 방안에 관한 실험적 고찰)

  • Lee, Mun-Hwan;Ryu, Deug-Hyun
    • Journal of the Korea Concrete Institute
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    • v.19 no.5
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    • pp.647-653
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    • 2007
  • In ready mixed concrete factory, in case of using the high molecular additive in winter especially the liquid additive for the early strength, it is required to check the stability. In this research, the freezing and gelling characteristics of the liquid additive for the early strength is reviewed, the material and mechanical solution are proposed to that the practical quality control method will be suggested. As the result, the Freezing temperature of the liquid additive for the early strength is $-11.8^{\circ}C$, and it is the lower than the temperature at which the strength is shown. By making with sodium silicate of $37{\pm}0.5%$ designed by $SiO_2\;and\;Na_2O$ in 0.31 of mol ratio, it minimizes the gelling at the lower temperature. On the other hand, facilities for storing and supplying the material should be set at $40^{\circ}C$ so the temperature distribution is well spreaded for practical operation.

Basic Properties of Alkali-activated Mortar With Additive's Ratio and Type of Superplasticizer (감수제 종류 및 첨가율 변화에 따른 알칼리 활성 모르타르의 기초적 특성)

  • Han, Cheon-Goo;Chang, Ji-Han
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.3 no.1
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    • pp.50-57
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    • 2015
  • Portland cement production is under critical review due to high amount of $CO_2$ gas released to the atmosphere. Attempts to increase the utilization of a by-products such as fly ash and ground granulated blast-furnace slag to partially replace the cement in concrete are gathering momentum. Many researchs on alkali-activated concrete that does not need the presence of cement as a binder have been carried out recently. Instead, the sources of material such as fly ash, that are rich in Silicon(Si) and Aluminium(Al), are activated by alkaline liquids to produce the binder. Hence concrete with no cement is effect reduction of $CO_2$ gas. In this study, we investigated the influence of the fluidity, air content and compressive strength of mortar on alkaline activator in order to develop cementless fly ash and ground granulated blast-furnace slag based alkali-activated mortar with superplasticizer. In view of the results, we found out that Pn of fluidity and compressive strength is the best in four type of superplasticizer, and PNS of powder type of fluidity is better than that of liquid type in the case of AA.

Development of Rural Road Pavement Technology Using Cement Stabilizer (시멘트계 고화재를 활용한 농어촌도로 포장공법 개발)

  • Oh, Young-In;Kong, Gil-Yong;Kim, Seung-Wook
    • International Journal of Highway Engineering
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    • v.9 no.4
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    • pp.171-184
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    • 2007
  • Chemical admixture stabilization has been extensively used in both shallow and deep stabilization in order to improve inherent properties of the soil such as strength and deformation behavior. An increment in strength, a reduction in compressibility, an improvement of the swelling or squeezing characteristics and increasing the durability of soil are the main aims of the admixtures for soil stabilization. Recently, the various advanced cement stabilizer mixing technique was developed. Advanced cement stabilizer mixing technique is environmentally-friendly and has an excellent mixing property and outstanding mixing speed. In this study, to develop the rural road pavement technology using cement stabilizer, compaction and unconfined compression test were performed with various mixing ratio and two types of soil(clay and silty soil). And the freezing/thaw test and bending strength test performed to develop suitable cement stabilizer material for stabilization of rural road. Based on the test results, the liquid types of cement stabilizer material and silty soil mixture are most suitable for rural road construction and although the mixing ratio is low, cement stabilizer mixture is effective for durability of rural road surface layer.

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