原材料对水泥砂浆性能的影响研究

水泥和砂的质量、引气剂的种类均会对水泥砂浆性能产生影响,其中水泥中高吸附性材料对制备的砂浆工作性能影响较大,需严格加以控制。不同引气剂的起泡、稳泡能力和气泡尺寸不同,对砂浆的稠度、分层度和强度会造成不同影响,采用摇泡试验可快速甑选出合适的引气剂。另外,砂的细度模数,甚至洁净程度（泥灰含量）和堆积密度也会对砂浆性能产生较大影响,在控制水泥的砂浆性能时,应验证并确保重新配制试验用砂的稳定性。     

水泥工业碳减排路径分析

介绍了目前国内的碳中和背景及发展现状,并基于水泥产业碳排放的相关数据,对该行业碳减排的方法和途径进行分析。水泥工业90%的二氧化碳排放来自熟料生产(碳酸钙分解、燃料燃烧),其余的10%来自原材料的准备和水泥制品的生成。指出发展创新减排燃烧、节能降耗技术、提高替代燃料掺烧量以及二氧化碳的捕集、封存与利用（CCUS）,是实现水泥产业碳中和的主要手段。     

燃气轮机余热发电系统方案选择

综合利用不同型号燃气轮机余热的发电系统,根据水泥厂自备电站的不同型号燃气轮机余热情况,拟定余热发电技术方案,分析比较不同方案下余热发电系统的技术指标,从而选择合理的技术方案。     

定向爆破技术在水泥厂窑尾框架拆除中的应用

广西鱼峰太阳村5 500 t/d熟料生产线项目是在拆除老线的基础上新建,老线总高75 m的窑尾框架需要拆除。拆除场地狭小,且附近有已有建筑需要保护,采用定向爆破技术进行拆除。在实施爆破过程中,选取合理的爆破参数,通过精心组织施工,在爆破过程中成功保护了需要保护的建筑。     

Acid resistance of polyester-impregnated modified cement mortar

The influence of distilled water and sulphuric acid solutions on the physico-mechanical properties of neat and modified cement mortar has been investigated. The samples were immersed in distilled water, and different concentrations of sulphuric acid ranged from 5–15% by vol for immersion times from 1 to 120 days. The effect on the loss of weight, compressive strength, apparent porosity, water absorption, IR, and SEM were studied. The results indicate that the compressive strength and loss of weight decrease, whereas the apparent porosity and water absorption increase with immersion time and acid concentration. These are probably due to partial dissolution of the set cement. IR spectra and SEM studies showed significant changes in some absorption bands and the appearances of new voids of the neat and composite mortars after being immersed in H₂SO₄ solutions. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 685–693, 1999     

高性能低钙硅酸盐水泥熟料的矿物组成

在前人工作基础上,对高性能低钙硅酸盐水泥熟料的矿物组成要求进行了综合评述。为实现高强化,应适当提高熟料中硅酸盐矿物的总量,而减少中间相特别是Ｃ３Ａ的数量则有利于实现浆体的低需水量和高流动性,并可降低水泥水化热,提高所形成熟料的活性和混凝土耐久性。在熟料中引入Ｃ４Ａ３Ｓ可显著提高低钙水泥的早强,但必须对其凝结控制问题开展深入研究。     

窑尾强化煅烧技术在硫铝酸盐水泥生产中的应用

介绍了水泥窑立筒预热器节能技术,在硫铝酸盐水泥、铁铅酸盐水泥生产中的应用情况,为特种水泥生产提高效益提供了新经验.     

Farmers' perceptions and attitudes towards introduced soil-fertility enhancing technologies in western Africa

Soil fertility enhancing technologies (SFETs) have been promoted in the West African Semi-Arid Tropics (WASAT) for many years with limited success. Using a qualitative approach of focus group discussions, long, open-ended interviews and observations from field visits, this paper explores with farmers their beliefs and rationales behind the adoption or non-adoption of SFETs. Farmers are knowledgeable about, and practise SFETs of rock phosphate application, crop residue and farm yard manure, chemical fertilizer and crop rotation to combat soil fertility decline. Their attitudes to and rationales behind adoption decisions are influenced by the availability and use policies of land and labour resources, food security concerns, perceived profitability, contribution to sustainability and access to information. Some of the factors are beyond farmers' control and require a broad and integrated effort from research, extension and government to promote the use of the SFETs in the region.     

Effects of soil solution on the dynamics of N2O emissions: a review

In this review, which consists of two parts, major interactions between nitrous oxide (N₂>O) and soil solution are described. In the first part, as an introduction, concentrations of dissolved N₂>O in different aqueous systems are summarized. An inventory of data on maximal N₂>O concentrations in soil solution (up to 9984 g N₂>O-N l^–1>) and in soil air (up to 8300 ppm) from literature is presented. The peak N₂>O concentrations represent a N₂>O supersaturation in the soil solution up to 30000 times with respect to ambient air and a soil air N₂>O concentration about 25000 times higher than in the atmosphere. The main physico–chemical parameters (solubility, diffusion) controlling N₂>O distribution between soil solution and soil air are outlined. The influences of cultivation practice, nitrogen turnover, water content and temperature on N₂>O a ccumulation in soil solution and soil air are reviewed. In the second part some models of N₂>O dynamics in soils are discussed with emphasis on N₂>O transport processes. A simple qualitative scheme is developed to categorize the effects of the soil solution on N₂>O dynamics in soils. In this scheme the temporary, intensive N₂>O oversaturation of the soil solution is interpreted as a result of gas diffusion inhibition by water (barrier function of soil solution) resulting in an accumulation of N₂>O. In addition, N₂>O supersaturation is an indication that transitory much N₂>O can be stored in the soil solution (storage function of soil solution). Where the soil solution flows up-, down- or sidewards it can act as a relevant transport medium for dissolved N₂>O (transport function of soil solution). This scheme is applied to examples from the literature.     

Controlling soil water content in fertiliser dissolution experiments

Phosphorus lost in runoff from agricultural land leads to the enrichment of surface waters and contributes to algal blooms. Fertilisers are one source of this P. To compare the water available P of different fertiliser formulations in the laboratory it is necessary to control environmental conditions, temperature, relative humidity and soil water content, prior to simulating rainfall. Two chambers were designed in which relative humidity and soil water content were controlled using salt solutions. An initial design comprising a sealed chamber with three layers of soil samples over a salt bath was found to be inferior to a single layer design. The changes in water content of soil samples were used to test the single layer chamber in a constant temperature environment (15 °C) using a saturated KCl solution (90% relative humidity). Based on the final soil water content of the samples, the spatial variation within the chamber was within tolerable limits. The single layer chamber was used for a simulation experiment comparing the water available P of two commercial fertilisers. Using a saturated resorcinol solution (95% relative humidity) soil samples were equilibrated at 15 °C for 21 days, fertiliser added, and the water available P measured up to 600 h after fertiliser application. The results indicate that the amount of water available P was related to the fertiliser compound and exponentially related to the time since fertiliser application. It was concluded that the single layer chamber is suitable for controlling relative humidity and soil water content in trials such as these where the water available P of fertilisers are being compared.