Evaluation of the activity of pozzolanic materials
Evaluation of the activity of pozzolanic materials
复制标题
火山灰材料的活性评价
DOI：
10.1002/jctb.5020241206
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
A. Afify
中科院分区：
文献类型：
--
作者：
K. M. Hanna;A. Afify
进行抗压强度和溶解试验，以评估一些天然和人造材料的火山灰活性。对由61%波特兰水泥熟料、35%火山灰材料和4%石膏组成的水泥制成的砂浆进行强度测试。一曰：1，按重量计，火山灰-石灰混合物用于测定通过Ca（OH）2和所研究的火山灰材料之间的反应而在冷HCl（d = 1.12）中变得可溶的SiO2、Al 2 O3和Fe 2 O3的量。砂浆样本和火山灰-石灰浆均在25±1°C下固化90天。
发现在抗压强度与SiO2和R2 O3的增溶之间存在的线性关系由以下方程表示：
其中S是用含有35重量%火山灰的火山灰水泥制成的砂浆立方体的以kg/cm 2计的抗压强度; SiO2 +溶胶R2 O3表示通过Ca（OH）2与水泥的火山灰组分之间的反应而变得可溶的SiO2、Al 2 O3和Fe 2 O3的重量百分比，并针对溶胶进行校正。SiO2和R2 O3。
粒化炉渣和硅藻土给出的结果不满足上述关系;对此原因进行了讨论。
Compressive strength and solubilisation tests were carried out to evaluate the pozzolanic activity of some natural and artificial materials. Strength tests were performed on mortar made with cements composed of 61% Portland cement clinker, 35% pozzolanic material and 4% gypsum. 1 : 1, by weight, pozzolana-lime mixtures were used for the determination of the amount of SiO2, Al2O3 and Fe2O3 rendered soluble in cold HCl (d = 1.12) by reaction between Ca(OH)2 and the pozzolanic materials under investigation. Both of the mortar specimens and the pozzolana-lime pastes were cured for 90 days at 25±1°C.
The linear relationship found to exist between compressive strength and solubilisation of SiO2 and R2O3 is represented by the equation:
where S is the compressive strength in kg/cm2 of mortar cubes made with pozzolanic cement containing 35% by weight pozzolana; and sol. SiO2 + sol. R2O3 represents the percentages by weight of SiO2, Al2O3 and Fe2O3 rendered soluble by reaction between Ca(OH)2 and the pozzolana constituent of the cement, and corrected for the sol. SiO2 and R2O3 of the original pozzolana.
Granulated slag and diatomaceous earth gave results not satisfying the above relation; reasons for this are discussed.