本文關(guān)鍵詞： 赤泥 赤泥水泥固化土 電阻率 無(wú)側(cè)限抗壓強(qiáng)度　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：工業(yè)氧化鋁生產(chǎn)過程中產(chǎn)生大量赤泥,赤泥堆放對(duì)土壤造成嚴(yán)重危害,為解決赤泥大量堆積及綜合利用等問題,將赤泥應(yīng)用于道路基層材料,代替部分水泥固化土,減少赤泥堆放并降低路用水泥的成本。本文將通過了解赤泥電阻率特性為其提供理論依據(jù)。通過室內(nèi)試驗(yàn),研究赤泥電阻率與電流頻率、含水率、齡期、孔隙率以及應(yīng)變之間的關(guān)系,證明電阻率法研究赤泥應(yīng)用的可行性。工程場(chǎng)地中的土體易被酸堿性廢水污染,降低固化土路基的工作性能,從而引起工程事故的產(chǎn)生。基于這一擔(dān)憂,本文以酸堿污染為典型,與赤泥水泥固化土形成不同污染程度和類型的污染土,以此來(lái)模擬工程中酸堿污染路基的情況。以赤泥和水泥為固化劑,采用酸堿溶液調(diào)節(jié)水的p H值,模擬酸堿污染固化土。探討了電流頻率、養(yǎng)護(hù)齡期和酸堿溶液對(duì)固化土電阻率的影響,成型方式、養(yǎng)護(hù)齡期和酸堿溶液對(duì)固化土無(wú)側(cè)限抗壓強(qiáng)度影響,以及電阻率與抗壓強(qiáng)度之間的關(guān)系。基于以上問題,主要研究結(jié)論如下:(1)對(duì)赤泥和赤泥水泥固化土試塊進(jìn)行電阻率測(cè)試時(shí),電流頻率對(duì)電阻率有相同的變化規(guī)律。50Hz≤電流頻率f50kHz時(shí),隨電流頻率的不斷升高,電阻率快速降低;50kHz≤電流頻率f≤1MHz時(shí),隨電流頻率的不斷升高,電阻率變化趨勢(shì)變緩。為減少電流頻率對(duì)測(cè)試的影響,在下文中將選用電流頻率f=50kHz時(shí)的電阻率進(jìn)行分析。(2)赤泥電阻率隨含水率的增加而降低。不同孔隙率下,含水率較小時(shí),隨齡期的延長(zhǎng),赤泥電阻率先升高后降低;含水率較大時(shí),赤泥電阻率隨齡期的變化較小。在含水率一定的情況下,赤泥電阻率隨孔隙率的增大,呈現(xiàn)先急速減小又增大的變化規(guī)律。赤泥電阻率隨應(yīng)變的增加而降低。(3)赤泥水泥固化土電阻率隨齡期的變化規(guī)律,會(huì)因成型方式的不同發(fā)生改變,立即成型試樣的電阻率隨齡期變化曲線劃分為三個(gè)階段:升高階段(1d≤t14d)、降低階段(14d≤t21d)、平緩階段(21d≤t≤28d),靜置4h成型試樣的電阻率隨齡期的增加而增大。溶液呈酸性時(shí),電阻率隨p H的增大而增大;溶液呈堿性時(shí),固化土電阻率隨p H的增大而減小。(4)靜置4h成型試樣的赤泥水泥固化土無(wú)側(cè)限抗壓強(qiáng)度有明顯降低的趨勢(shì)。立即成型試樣的抗壓強(qiáng)度隨齡期的變化分為兩個(gè)階段:快速增長(zhǎng)階段(7d≤t14d)、緩慢增長(zhǎng)階段(14d≤t≤28d);隨齡期的增加,靜置4h成型試樣的抗壓強(qiáng)度呈線性增加。摻入酸性溶液立即成型試樣的抗壓強(qiáng)度隨p H的增大而減小,摻入堿性溶液的抗壓強(qiáng)度隨p H的增大而增大;摻入酸性、堿性溶液靜置4h成型試樣的抗壓強(qiáng)度隨p H的增大,均先增大后減小。在同一p H下,靜置4h成型試樣的抗壓強(qiáng)度與電阻率有良好的線性相關(guān)性。
[Abstract]:In order to solve the problem of red mud accumulation and comprehensive utilization, red mud is applied to road base material in order to solve the problem that a large amount of red mud is produced in the process of production of industrial alumina, and red mud stacking causes serious harm to soil. Instead of some cement solidified soil, it can reduce the red mud stacking and reduce the cost of road cement. This paper will provide the theoretical basis by understanding the characteristics of the red mud resistivity. Through laboratory tests, the resistance and current frequency of red mud will be studied. The relationship among water content, age, porosity and strain proves the feasibility of using resistivity method to study the application of red mud. The soil in engineering site is liable to be polluted by acid and alkaline wastewater, and the working performance of solidified soil subgrade is reduced. Based on this concern, the acid-base pollution is typical, and different pollution degree and type of contaminated soil are formed with red mud cement solidified soil. In order to simulate the acid-alkali pollution of roadbed in engineering, using red mud and cement as curing agent, adjusting pH value of water with acid-base solution, simulating acid-base pollution solidified soil, the current frequency is discussed. The influence of curing age and acid-base solution on the resistivity of solidified soil, forming mode, curing age and acid-base solution on unconfined compressive strength of solidified soil. And the relationship between resistivity and compressive strength. Based on the above problems, the main conclusions are as follows: 1) when the resistivity of red mud and red mud cement solidified soil samples are tested. When the current frequency is less than 50 kHz, the resistivity decreases rapidly with the increasing of current frequency. When 50 kHz 鈮，

本文編號(hào)：1449967