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    Improvement of crushed rock by polymer and portland cement on California Bearing Ratio (CBR) under soaked condition
    (2020-01-01)
    Chaiyaput, Salisa
    ;
    Maleesee, K.
    ;
    Sirikaew, U.
    ;
    Artidteang, S.
    The pavement consists of surface course built on the top followed by base, subbase, and subgrade, respectively. The high stresses occur at the top layer, which is placed by the expensive material with high quality, while cheaper material with low quality is placed in the lower layer, respectively. Crushed rock is normally applied as the base material, which is required to support the high stress transmission. The soil improvement techniques have become one alternative to apply for increasing the soil strength. The one technique has been wildly adopted, is called “soil cement”. On the other hand, the soil cement road is easily to damage by heavy raining and flooding, due to brittle crack behavior in Portland cement property. Consequently, polymer has high elastic modulus, is precious to solve the brittle failure problem. This paper examines the effect of concurrent use of liquid polymer and Portland cement on crushed rock as reinforced pavement base material. The strength of polymer-treated crushed rock (treated crushed rock) and ordinary crushed rock (untreated crushed rock) were characterized and compared. In strength analysis, the California bearing ratios (CBR) of untreated and treated crushed rock were determined under soaked condition to simulate post-flood pavement damage. As a result, it was found that the CBR value of the treated crushed rock has higher than the CBR values of the untreated crushed rock (approximately two times).
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    Effect of polymer and Portland cement on strengthen crushed rock for pavement base
    (2019-01-01)
    Chaiyaput, S.
    ;
    Bergado, D. T.
    ;
    Ayawanna, J.
    The effect of concurrent use of liquid polymer and Portland cement as a reinforced material in crushed rock pavement base was investigated in this work. The strength of polymer-treated crushed rock (treated crushed rock) and ordinary crushed rock (untreated crushed rock) were characterized and compared. In strength analysis, the California bearing ratios (CBR) of untreated and treated crushed rock were determined under unsoaked and soaked conditions to simulate post-flood pavement damage. The unconfined compressive strength (UCS) was evaluated under unsoaked conditions for 2h, 1-day, 3-day, 7-day, and 28-day curing periods. The results showed that the CBR of untreated and treated crushed rock under soaked and unsoaked conditions were positively correlated with dry density. The CBR under the unsoaked condition of untreated crushed rock was identical to that of treated crushed rock. Meanwhile, under the soaked condition, the CBR of treated crushed rock was twice as higher than the untreated crushed rock. The swelling indices were 0% for both untreated and treated samples. The UCS of treated crushed rock showed positively correlation with the curing time. The use of liquid polymer and Portland cement, therefore, improved the strength of crushed rock pavement base in which effectively mitigate the post-flood pavement damage.
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    XML document recommendation by using case based reasoning
    (2010-09-01)
    Vacharaskunee, Sutheetutt
    ;
    Intakosum, Sarun
    Case Based Reasoning (CBR) is the process of solving new problem based on the solutions of similar previous problems. XML is a markup language that allows document owners describe their data in their own formats. There might be the same information has been described in various ways. This makes searching those information from different formats difficult. CXDR (CBR for XML Document Recommendation) is an idea to make searching XML documents easier. CXDR applies CBR framework to collect the mostly use XML document and recommend it to its user. CBR in CXDR consists of two parts, cases and knowledge. The case is XML documents and the knowledge is an XML document recommendation. The recommendation from CXDR is the most use XML element names and structure. © 2010 IEEE.