煤化工固废粗渣的表面处理及其混凝土的制备与应用性能研究

煤化工固废包括细粉状灰渣和颗粒状粗渣,用粗渣替代砂石制备煤矿采空区充填混凝土时存在的主要问题是粗渣的多孔性导致了吸水量大及混凝土的流动性差与强度低,制备了一种黏附固化剂(ACA),用其与水泥在粗渣表面形成黏附填充包覆涂层以解决存在的问题。在制备混凝土时掺入占水泥质量0.003%氧化石墨烯(GO)用以调控水泥基体的结构。在此基础上制备的含60%煤化工固废的混凝土28 d抗压强度大于40 MPa,含80%煤化工固废的混凝土28 d抗压强度大于30 MPa,同时具有良好的抗渗水及抗干缩性能。研究结果对于制备高含量煤化工固废混凝土及煤化工固废在制备采空区充填材料的大规模资源化利用具有积极意义。     

水泥土搅拌桩在深基坑支护中的应用

水泥土搅拌桩,即利用水泥、石灰等材料作为固化剂的主剂,通过特制的搅拌机械就地将软土和固化剂（浆液状或粉体状）强制搅拌,利用水泥和软土之间所产生的一系列物理化学反应,使软土硬结成具有整体性,水稳定性和一定强度的桩体,从而提高地基承载力,减少软土地基的沉降量,抑制侧向变形,满足工程建设要求。水泥浆与软土搅拌形成的柱状固结体,称为深层搅拌桩;水泥粉体与软土搅拌形成的柱状固结体,称为粉喷桩。二者合称为水泥土搅拌桩,简称为搅拌桩。     

含铝固化剂固化软土的试验研究

用普通硅酸盐水泥、石膏和一种含铝膨胀组分构成的复合固化剂（PC＋G＋Al固化剂）,选取2种有代表性的试样,进行软土固化试验研究,并与单纯使用水泥（PC）和水泥-石膏（PC＋G）固化剂加固软土的效果进行比较分析。研究结果表明：对2种试样,PC＋G＋Al固化剂加固效果优于其他2种固化剂;PC＋G固化剂只对孔隙比大、含水率高的试样加固效果优于PC固化剂的加固效果。PC＋G＋Al和PC＋G固化剂的水化物中都产生钙矾石,利用钙矾石生成的固相膨胀作用填充孔隙,而钙矾石的生成在固化土中是否产生增强效果,主要取决于钙矾石与水化硅酸钙凝胶生成过程的协调性。     

搅拌桩复合地基在灰岩地区的应用——中国银行云浮市分行职工住宅楼软土地基处理实例

<正>搅拌桩是通过专用的深层建筑搅拌机具就地将软土与固化剂(常用水泥、石灰等,本文是指用水泥作固化剂)浆液强制拌和,利用水泥和软土间所产主的一系列物理化学反应,使软土硬结成具有整体性、水稳性和一定强度的水泥土的一种桩型。     

基于固废物的土壤固化剂加固软土应用研究

通过利用矿渣、粉煤灰、脱硫石膏等工业废料制备了一种固化效果优异、成本低的新型固化剂。研究表明：新型固化剂的水泥、矿渣、脱硫石膏、粉煤灰的最佳配比为30∶40∶16∶14;添加新型固化剂可以加速软土固化,与普通硅酸盐水泥固化剂相比,同等掺量下强度对比增长113%。此外,还可明显改善传统水泥固化土早期强度不足的问题,在相同固化剂掺量下,早期强度增长101%,可迅速满足工程需求。由此可见,该新型固化剂可以替代水泥等传统土壤固化剂,在工程应用中具有良好的前景。     

浅议水泥粉喷桩检测方法的应用

水泥粉喷桩是一种用于加固饱和粘土地基的常用软基处理技术,它将水泥作为固化剂与软土在地基深处强制搅拌,由固化剂和软土产生一系列物理化学反应,使软土硬结成一定强度的水泥加固体,从而提高地基土承载力和增大变形模量。本文主要对水泥粉喷桩的几种检测方法做了简要分析。     

浅议水泥粉喷桩检测方法的应用

水泥粉喷桩是一种用于加固饱和粘土地基的常用软基处理技术,它将水泥作为固化剂与软土在地基深处强制搅拌,由固化剂和软土产生一系列物理化学反应,使软土硬结成一定强度的水泥加固体,从而提高地基土承载力和增大变形模量。本文主要对水泥粉喷桩的几种检测方法做了简要分析。     

水泥土搅拌桩强度检测的探讨

水泥土搅拌桩是利用水泥、水灰等材料作为固化剂的主剂,通过特制的深层搅拌机械,在地基深处就将软土和固化剂强制搅拌,利用固化剂与软土之间所产生的一系列物理化学反应,使软土硬结成具有整体性、水稳性和一定强度的优质地基.     

管桩废浆利用的试验研究

管桩生产离心后排出的大量废浆成为二次污染源,我公司在废浆再利用的研究中,尝试将废浆用于管桩的混凝土生产过程中,以替代部分水泥和磨细砂并利用缓凝剂保证废浆在掺入混凝土生产中的有效性。     

浅谈水泥搅拌法的施工技术

水泥土搅拌桩是指利用水泥等材料作为固化剂,经过特制的搅拌机械,在地基深处就地将软土与固化剂强制搅拌,由固化剂与软土间产生一系列的物理和化学反应,使软土硬结成具有整体性、水稳定性和一定强度的水泥土加固体。     

Solid wastes generation in India and their recycling potential in building materials

Presently in India, about 960 million tonnes of solid waste is being generated annually as by-products during industrial, mining, municipal, agricultural and other processes. Of this ∼350 million tonnes are organic wastes from agricultural sources; ∼290 million tonnes are inorganic waste of industrial and mining sectors and ∼4.5 million tonnes are hazardous in nature. Advances in solid waste management resulted in alternative construction materials as a substitute to traditional materials like bricks, blocks, tiles, aggregates, ceramics, cement, lime, soil, timber and paint. To safeguard the environment, efforts are being made for recycling different wastes and utilise them in value added applications. In this paper, present status on generation and utilization of both non-hazardous and hazardous solid wastes in India, their recycling potentials and environmental implication are reported and discussed in details.     

应用于粉砂土的土壤固化剂性能及机理分析

粉砂土颗粒间联结强度低,粘聚力差,不易固化。采用水泥熟料、粉煤灰、矿渣、石灰、石膏和激发剂混合研磨而成复合土壤固化剂,综合发挥各固化材料的优势,达到了较好固化效果。结合粉砂土性质和固化剂各原材料的性能特点,分析其固化原理。结论是：粉砂土的固化主要由复合固化材料的胶凝和填充作用形成。     

EWEC土壤固化剂在深层搅拌桩中的应用研究

结合EWEC新型土体固结剂与传统水泥固结剂在深层搅拌桩应用中的对比试验，阐述了EWEC固化土的作用机理，证明了EWEC固化剂可以使搅拌桩固结土强度大幅度提高，从而可以显著增加深层搅拌桩复合地基的承载能力。     

搅拌桩用工业废料胶结剂的实验室研究

对比了工业废料胶结剂加固土与425普通硅酸盐水泥加固土的无侧限抗压强度试验、压缩固结试验和渗透试验的结果,以验证工业废料胶结剂代替普通水泥的可行性．同时,对无侧限抗压强度的影响因素进行了分析,并给出了相应的关系表达式。     

Durability of soft clay soil stabilized with recycled Bassanite and furnace cement mixtures

This study examines the wetting–drying durability of soft clay soil stabilized with recycled Bassanite, produced from gypsum waste. Specifically, this study focuses on an investigation of the effects of the moisture conditions on the strength performance and durability of very soft clay soil stabilized with Bassanite and furnace cement mixtures during the wetting–drying cycles, referred to as weathering conditions in this study. Cylindrical stabilized soil specimens were produced and then cured for 28 days. The cured specimens were subjected to different numbers of wetting–drying cycles, and then tested for unconfined compressive strength. The results show that the compressive strength increased with an increase in the Bassanite content for the different wetting–drying cycles investigated. The increase in the Bassanite content is associated with the increase in the dry unit weight, as well as in the decrease in the moisture content of the stabilized specimens for the different wetting–drying cycles investigated. The compressive strength of the soil stabilized with the Bassanite and furnace cement mixtures gradually decreases with an increase in the number of wetting–drying cycles, and the earlier cycles are seen to have a more negative effect on durability than the later cycles. Generally, the influence of the wetting–drying cycles on changes in the strength, durability and volume of the soft clay soil stabilized with Bassanite and furnace cement mixtures is not significant. This is evidence that the use of recycled Bassanite, produced from gypsum waste to stabilize soft clay soil, achieves acceptable durability, raises the strength performance and improves the engineering properties of soft clay soil in a wet environment. In addition, the effective use of gypsum waste contributes to the development of a sustainable society by reducing the huge quantity of solid waste and establishing a sound environment.     

含盐量与固化材料掺量对固化盐渍土抗压强度的影响

为解决滨海盐渍土的低强度和大变形问题,采用水泥、石灰、SH固土剂固化盐渍土,研究含盐量、固化材料掺量、养护龄期和浸泡用水对固化土抗压强度的影响.结果证实:含盐量大于1%,固化土抗压强度随含盐量的增加而减小;掺加水泥、石灰、SH固土剂均可提高土的强度和水稳性;随养护龄期的增加,固化土的抗压强度增加;石灰固化土和SH固土剂...     

Use of Cement Kilns in Managing Solid and Hazardous Wastes: Implementation in Australia

The use of cement kilns for managing solid and hazardous wastes is facilitated by the high temperature, long gas retention periods, natural alkaline environment, minimum amount of waste produced and high thermal capacity. The main benefits include energy recovery, conservation of fossil fuels, reduction in cement production costs and the use of already existing facilities.
The test burns conducted in cement kilns worldwide have demonstrated very high destruction efficiencies for most stable organic compounds, with toxic contaminants barely above the background levels.
There are several cement plants in the US and Europe presently using solid and hazardous wastes as supplementary fuel. The application of this technology in Australia has been ignored in the past. An international conference (Kilnburn'92) on the role of cement kilns in waste management was held recently in Australia and has enhanced the implementation of this technology in Australia.     

利用工业废渣制备水泥与废渣的水泥封固

从废渣对环境的危害程度可以分为基本无害废渣、有害废渣（包括无机有害废渣和有机有害废渣）以及核废料。随着工业废渣的日益增加,迫切需要一种能工业化生产、经济上合理又很有效的处理方法。本文阐述了废渣的处理方法,主要比较了利用废渣制备硅酸盐水泥及其复合水泥、硫铝酸盐水泥的优缺点以及采用这些水泥封固废渣的优缺点。硫铝酸盐水泥比硅酸盐水泥及其复合水泥更具优越性。     

水泥-废石膏加固软土的试验研究

利用废石膏和水泥配合加固软土，与单纯用水泥加固相比，可显著提高加固效果。在水泥－废石膏的水化物中，既有水泥产生的水化硅酸钙胶结松散的土颗粒，又有水泥与石膏产生的钙矾石膨胀填充孔隙。加固土孔隙水中ＣａＯ，ＯＨ－浓度决定水泥－废石膏的适用性及其增强效果。