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    Highly durable cement products containing siliceous ashes
    1.
    发明授权
    Highly durable cement products containing siliceous ashes 失效
    高度耐用的含硅质灰泥的水泥制品

    公开(公告)号：US5346548A

    公开(公告)日：1994-09-13

    申请号：US47

    申请日：1993-01-04

    Applicant: Povindar K. Mehta

    Inventor： Povindar K. Mehta

    IPC: C04B18/10 ,  C04B28/04 ,  C04B16/02

    CPC classification number: C04B18/101 ,  C04B28/04 ,  Y02W30/92 ,  Y02W30/94 ,  Y10S106/01

    Abstract: Compositions particularly suitable for use in preparation of concrete and mortar products comprising at least one cement and from about 5% to about 30% by weight of the cement of siliceous ash from crop residue, wherein the ash is from about 60% to about 95% by weight silica, at least about 90% of the silica is amorphous, at least about 75% of ash particles are in a size range of from about 4 to about 75 micrometers, and the ash particles have a mean particle diameter measured by laser-light scattering of at least 6 micrometers and a B.E.T. surface area of at least 20 m.sup.2 /g. The cement employed is a portland cement or a blended portland cement. Concrete and mortar products prepared from these compositions are characterized by exhibiting after 28 days a compressive strength of at least 2500 psi and chloride permeabilities of less than 2000 coulombs when measured in accordance with AASHTO T-277.

    Abstract translation: 特别适用于制备混合物和砂浆产品的组合物，其包含至少一种水泥和约5％至约30％重量的来自作物残余物的硅质灰泥，其中灰分为约60％至约95％ 的二氧化硅，至少约90％的二氧化硅是无定形的，至少约75％的灰分颗粒在约4至约75微米的尺寸范围内，灰分颗粒具有通过激光 - 至少6微米的光散射和BET 表面积至少为20m2 / g。 所用水泥是波特兰水泥或混合波特兰水泥。 由这些组合物制备的混凝土和砂浆产品的特征在于，根据AASHTO T-277测量，在28天后显示出至少2500psi的抗压强度和小于2000库仑的氯化物渗透性。

    High iron oxide hydraulic cement
    2.
    发明授权
    High iron oxide hydraulic cement 失效
    高氧化铁水硬性水泥

    公开(公告)号：US4036657A

    公开(公告)日：1977-07-19

    申请号：US598411

    申请日：1975-07-23

    Applicant: Povindar K. Mehta

    Inventor： Povindar K. Mehta

    IPC: C04B7/22 ,  C04B7/02 ,  C04B7/04

    CPC classification number: C04B7/22

    Abstract: Hydraulic cements having higher (about 5%) iron-oxide content and lower (43-57%) than the usual calcium-oxide content of Portland cements are disclosed. These high iron-oxide cements have normal setting times, but high early strengths that develop without resorting to fine grinding or steam curing. The cements can be produced with considerably less expenditure of energy than required for conventional Portland cements due to lower burning temperatures and reduction in the amount of calcium-oxide which requires the greatest energy input for preparation of the cements.

    Abstract translation: 披露了比普通硅酸盐水泥的通常氧化钙含量高（约5％）和较低（43-57％）的水硬水泥。 这些高铁氧化物水泥具有正常凝固时间，但是在不采用细磨或蒸汽固化的情况下发展的高的早期强度。 由于较低的燃烧温度和较少的氧化钙需要最大的能量投入来制备水泥，所以能够生产比常规硅酸盐水泥要少得多的能量消耗的水泥。

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