LIME-SULFUR BASED LIQUID CEMENT ADDITIVE AND CEMENT COMPOSITION

To provide a lime-sulfur based cement additive capable of obtaining a cement concrete that has good fluidity retention effect and self-shrinkage reduction effect, high short-term compressive strength and can suppress elution of hexavalent chromium, and good solution stability.SOLUTION: A lime-sulfur...

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Bibliographic Details
Main Authors KURAMOTO YUTA, SASAKI TAKASHI, MORIOKA MINORU, ARAKI AKITOSHI, WATANABE MASAAKI
Format Patent
LanguageEnglish
Japanese
Published 05.12.2019
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Summary:To provide a lime-sulfur based cement additive capable of obtaining a cement concrete that has good fluidity retention effect and self-shrinkage reduction effect, high short-term compressive strength and can suppress elution of hexavalent chromium, and good solution stability.SOLUTION: A lime-sulfur based cement additive of this invention contains calcium ions, potassium ions, sodium ions, and zinc ions, and the molar ratio of the calcium ions to the sulfide sulfur is 0.25 to 0.50, and the concentration of ions are such that: the calcium ion amount is 5 to 15% by mass, the potassium ion amount is 10 to 1000 ppm, the sodium ion amount is 10 to 1000 ppm, and the zinc ion amount is 1 to 200 ppm.SELECTED DRAWING: None 【課題】良好な流動性の保持効果及び自己収縮低減効果を有し、短時間の圧縮強度が高く、六価クロムの溶出を抑えることができるセメントコンクリートを得ることが可能で、かつ、良好な溶液安定性を有する石灰−硫黄系液体セメント添加剤を提供する。【解決手段】カルシウムイオン、カリウムイオン、ナトリウムイオン、亜鉛イオンを含み、前記硫化物態硫黄に対する前記カルシウムイオンのモル比が０．２５〜０．５０であり、前記カルシウムイオン量が５〜１５質量％であり、前記カリウムイオン量が１０〜１０００ｐｐｍであり、前記ナトリウムイオン量が１０〜１０００ｐｐｍであり、前記亜鉛イオン量が１〜２００ｐｐｍである石灰−硫黄系液体セメント添加剤である。【選択図】なし
Bibliography:Application Number: JP20180101503