Application of the methylene blue test to cement raw materials

Characterisation of raw materials for Portland cement manufacture by use of the methylene blue adsorption method is discussed. The method is shown to be a simple, convenient ‘rule of thumb’ procedure. It provides a guide to the quantity and type of argillaceous minerals present in a given raw material sample.     

Modification of High Performances of Polymer Cement Concrete

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水泥砂浆的率型损伤演化

实验结果表明,水泥砂浆在受力变形中的损伤演化是率相关的,因此,类似于位错运动的热激活机制;给出了水泥砂浆的率型损伤演化律．     

抗腐蚀低密度水泥浆体系的研究

分析了地层水腐蚀油井水泥的机理,并通过大量试验研究,开发出了密度为1.30—1.50 g/cm~3的低密度水泥浆体系。同时在模拟腐蚀性地层水中,对该体系水泥浆凝结硬化形成的水泥石试件的耐久性和浆体的综合工程性能进行了评价。结果表明,该低密度水泥浆体系耐地层水腐蚀能力强,综合工程性能良好,可满足易漏浅井防止腐蚀性地层水腐蚀套管外壁的固井要求。     

成都市废弃水泥混凝土利用配送中心选址

采用专家打分法,根据“越大越好”的标准,对基于ANP的成都市废弃水泥混凝土再生利用配送中心建立的选址模型进行了研究,从最终的权重来看,郫县作为配送中心的最佳地点,会给整个成都市废弃水泥混凝土利用提供比较大的帮助。     

深层水泥搅拌桩在某核电站重件道路软基处理中应用

深层水泥搅拌桩是加固软上地基的一种有效方法,某核电站重件道路软土地基加固采用深层水泥搅拌桩进行处理,由于核电工程在施工质量、工期以及施工方法可靠性要求高。本文结合该核电站重件道路软土地基处理实践,介绍深层水泥搅拌桩的施工工艺、机械设备、质量控制与试验检验等方面的经验。     

水泥水化动力学模型

水泥的水化是一个复杂的变化过程,很难建立起一套直接用于描述水泥水化完整过程的动力学模型.依据水泥水化过程特点及化学反应动力学原理,明确了成核与产物生长、界面化学反应及扩散控制反应三种基本动力学方式对水泥水化的控制作用过程及转换条件,建立了水泥水化动力学模型.该模型能够直接依据水泥水化程度随时间的变化曲线确定水泥颗粒的水化速度,或在已知有关颗粒水化速度的基础上测算水泥在不同时间的水化程度.与其它模型相比,所建模型更加直观和准确.应用结果表明,提出的理论及方法具有良好的适用性和准确性.     

固井质量的测井评价及影响因素分析

在石油天燃气勘探开发中,油气井能否充分利用、正常生产及寿命长短关键在于固井质量的好坏。随着油气勘探开发的深入,超深井、水平井、厚套管井及"三高(高温、高压、高含硫)"气井,给固井质量测井评价技术提出了新的要求。采用多层套管完井,最多可达四层(13-3/8" +9-5/8"+7"+5")套管的四川气井埋藏深度一般在2500～6500米左右。本文主要介绍固井质量的用途及优缺点,声波变密度测井评价,固井声波变密度测井主要影响因素分析。     

Post-combustion of mazut with CO2 capture using aspen hysys

There is a wide range of resources for CO₂ emissions. The net amount of CO₂ emissions in the cement industry due to the consumption of fossil fuels and the chemical processes of cement production under heating raw materials is reported to be in the range of 15–25%; this industry, among all the industries and after the power plants and refineries, is the largest CO₂ gas producer throughout the world. Using CO₂ capture and storage (CCS), it can reduce greenhouse gas emissions in a short time. In this study, the technical feasibility study of recycling CO₂ in Abyek Cement Company, with a cement production capacity of about 12,500 tons per day in two production lines, has been studied as one of the largest cement industries throughout the world. Fuel oil (Mazut) is used as the primary fuel for furnaces in this industry. Affected by combustion, the emissions emitted from the five-stage preheater contain 5/24% vol% of CO₂, 7.6% H₂O, 4.8% vol% of O₂, and 63.1% N₂.     

An Octacalcium Phosphate Forming Cement

The osteoconductive and possibly osteoinductive characteristics of OCP increased the interest in preparation of bone graft materials that contain OCP in its composition. Calcium phosphate cements (CPCs) were prepared using a mixture of α-tricalcium phosphate (α-TCP) and dicalcium phosphate anhydrous (DCPA), with α-TCP / DCPA molar ratio of 1/1 and distilled water or 0.5 mol / L phosphate aqueous solution (pH = 6.1 ± 0.1) as the cement liquid. Hardening time was (30 ± 1) min for the CPC mixed with water and (5 ± 1) min for the CPC mixed with phosphate solution. Diametral tensile strength (DTS), porosity (P), and phase composition (powder x-ray diffraction) were determined after the hardened specimens had been immersed in a physiological-like solution (PLS) for 1 d, 3 d, and 7 d. In CPC specimens prepared with water, calcium hydroxyapatite (HA) was formed and DTS and P were (9.03 ± 0.48) MPa and (37.05 ± 0.20) vol % after 1 d, respectively, and (9.15 ± 0.45) MPa and (37.24 ± 0.63) vol % after 3 d, respectively. In CPC specimens prepared with phosphate solution OCP and HA were formed and DTS and P were (4.38 ± 0.49) MPa and (41.44 ± 1.25) vol % after 1 d, respectively,(4.38 ± 0.29) MPa and (42.52 ± 2.15) vol % after 3 d, respectively, and (4.30 ± 0.60) MPa and (41.38 ± 1.65) vol % after 7 d, respectively. For each group DTS and P did not change with PLS immersion time. DTS was significantly higher and P was significantly lower for CPCs prepared with water. HA formation slightly increased with immersion time from 40 mass % after 1 d to 50 mass % after 3 d in CPCs prepared with water. OCP + HA formation increased with immersion time from 30 mass % after 1 d to 35 mass % after 3 d and to 45 mass % after 7 d in CPCs prepared with 0.5 mol / L phosphate solution.