Lime

About: Lime is a research topic. Over the lifetime, 22198 publications have been published within this topic receiving 214379 citations.

From the historical sugar refinery of Chichaoua (Morocco) to the lab: a reverse engineering experimentation on the hydration of earthen materials stabilized with lime

Abstract: In order to explain the good state of conservation and good mechanical characteristics of the lime-stabilized earth of the sugar refinery near Chichaoua (Morocco, XVIth A.C.) XRD, SEM-EDX, TG-DSC, FT-IR analyses were performed on collected samples. Moreover laboratory earth samples were prepared with selected clay minerals (presence of attapulgite) and lime, involving a reverse engineering process in order to investigate the reaction products during curing . The same analyses performed on the historical samples were carried out on lab samples. Moreover, compressive strength was assessed. The results were compared to the ones obtained on the historical samples. The maturation of lime-stabilized rammed earth was due to lime carbonation and to earth drying and consolidation. Furthermore, the formation of mixed CSH phases was evidenced, possibly because of a slow pozzolanic reaction between lime and clays, that took place in long times both in lab and in historical samples.

Studies on yield and yield component responses of Mucuna flagellipes to lime and phosphorus applications under field culture in a tropical ultisol.

Abstract: Mucuna flagellipes was subjected to field scale culture over 1999 and 2000 growth seasons. Yield and yield component responses were evaluated using 4 x 3 factorial treatment combinations of phosphorus at 0, 20, 40, and 60kg P ha -1 and lime at 0, 1 and 2 t CaCO3 ha -1 . The experiment was laid out in a randomized complete block design and there were three replications. Liming and P-fertiliser, whether individually or in combination, significantly shortened the period to anthesis and to pod-set, increased the number of inflorescences, flowers and pods produced, and consequently increased seed yield. Percentage pod-set was improved by lime or P treatment but was still considered low at 43-45% on average. Combined application of 2 t ha-1 of CaCO3 and 40kg P ha -1 proved most satisfactory for use. Agro-Science Vol. 7 (1) 2008: pp. 58-65

Phosphorus slag powder building mortar

Abstract: The invention relates to phosphorus slag powder building mortar The mortar comprises the following components in percentage by weight: 20 to 50 percent of cement and 50 to 80 percent of phosphorus slag powder in a gelled material; a doped exciting agent accounting for 15 to 8 percent of the gelled material; a water reducing agent accounting for 02 to 03 percent of the gelled material; sand and lime sand in a weight ratio of 1:2 to 1:6; and water controlled to be between 30 and 10mm by thickness The phosphorus slag powder building mortar gives full play to phosphorus slag, improves workability of the mortar, and greatly reduces production cost Meanwhile, the building dry powder material digests a great amount of phosphorus slag and therefore reduces environmental pollution and turns waste into wealth The phosphorus slag powder building mortar is convenient to popularize and apply, and is the novel building material with low cost and high quality

The availability of soil phosphate. III.—The phosphate‐fixing capacity of soil

Abstract: A method for measuring the phosphate fixation of soil is described, in which the soil-phosphate mixture is evaporated to dryness and the unfixed phosphate subsequently extracted, using the Morgan reagent. In long-term fertilizer experiments, ammonium sulphate decidedly increased the phosphate-fixing capacity of soil. The effect of different forms of nitrogen on fixation was observed in laboratory experiments, those decreasing the pH causing increase in the fixing capacity of soil. Superphosphate reduced the fixing capacity of soil, probably through its partial saturation of the positive residual valencies of the clay complex. Potassium sulphate did not alter the phosphate-fixing capacity of soil. Lime precipitated the added phosphate in less soluble forms and thus reduced the fixing capacity of the soil. Dung caused a marked reduction in phosphate-fixing capacity, this effect being enhanced by application of lime. The existence of an H2PO4−-Ca-humic acid-micelle linkage would explain the phenomena. Addition of iron oxide (hydrated) greatly increased the phosphate-fixing capacity of soil. Addition of acid increased it and that of alkali reduced it, both in the absence and presence of added iron oxide. By removing free iron oxide, the fixing capacity of soil was not reduced and in some cases was further increased, suggesting that free iron oxide in soil was not the main constituent responsible for the fixation. The relative effects of exchangeable bases on the fixation of phosphate were, in decreasing order, H, K, Na, Mg, Ca. The present work supported the theory of an H2PO4−-Ca-micelle in soil.