本文關(guān)鍵詞：粉煤灰摻量對沖填砂漿結(jié)石體性能影響試驗研究　出處：《沈陽農(nóng)業(yè)大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 沖填砂漿 砂漿配合比 砂漿稠度 砂漿抗壓強度 粉煤灰摻量

【摘要】：最近幾年,有專家提出沖填砂漿結(jié)石筑壩技術(shù),是對漿砌石筑壩技術(shù)的一種革新。概括起來即為,利用混合砂漿自身的重力、流動性、沖擊力來將事先攪拌好的,按要求配比的流動性混合砂漿灌入事先攤平好的毛石料上,使砂漿自由流入毛石之間的空隙中去,來完成結(jié)石體的快速堆砌。此種簡單有效的施工方法的工作關(guān)鍵有兩個方面：1)為了保證混合砂漿和塊石具有良好的整體性能,必須盡可能避免在混合砂漿在沖填過程中產(chǎn)生氣泡或留有空隙,保證砂漿和骨料不離析,砂漿可以自由流動在骨料之間的縫隙中,達到?jīng)_填密實效果。2)為了滿足混合砂漿和骨料塊石之間的力學(xué)性能和強度大小要求,必須充分保證塊石與混合漿的界面具有良好的粘結(jié)性。本文通過對堆石體和混合砂漿的各自性能特點以及發(fā)揮材料各自的優(yōu)勢,提出了沖填砂漿結(jié)實施工技術(shù)。改變了原材料的利用方式,必定會對其各方面性能要有新的了解,所以本文對沖填砂漿結(jié)石施工技術(shù)主要進行了以下幾個方面的具體試驗。首先進行了沖填砂漿結(jié)石施工技術(shù)混合砂漿的材料配比試驗：在滿足膠凝材料總量不變的前提下,通過改變粉煤灰的摻量(0%、20%、30%、40%、60%)和水膠比的情況下,設(shè)計出15組試驗,其中有3組為不摻和粉煤灰的對照試驗。通過對砂漿的基礎(chǔ)試驗初步總結(jié)出粉煤灰摻量和水膠比對混合砂漿性能的影響,從混合砂漿的抗壓強度、保水性、以及流動性三方面綜合考慮,選出五組符合沖填砂漿結(jié)石施工技術(shù)性能要求的混合砂漿配合比,其中有一組是不摻和粉煤灰的對比試驗。其次選用以上五組混合砂漿的配比,模擬沖填砂漿現(xiàn)場沖入結(jié)石體的過程。在實驗室內(nèi),利用裝入塊石的玻璃箱來代替室外沖填環(huán)境的沖填試驗。試驗初步證明混合砂漿在堆石體中是可以滿足沖填結(jié)石要求的。通過試驗可以進一步確定強度滿足要求、砂漿流動性好、經(jīng)濟的最佳的砂漿配合比。最后選用一組配比進行不同骨料粒徑的結(jié)實體抗壓強度試驗,將第8組混合砂漿灌入裝有不同粒徑塊石的尺寸為200mm×200mm×200mm的試模中養(yǎng)護28d形成沖填砂漿結(jié)石體,利用WAW-2000D型壓力機做結(jié)石體的抗壓強度試驗,分別檢測結(jié)石體試塊的抗壓強度。通過本文的研究可以得出如下結(jié)論：1)當(dāng)水膠比為試驗所用的三種梯度,粉煤灰摻量為20%、30%、40%、60%其混合砂漿的稠度均滿足沖填要求。且當(dāng)粉煤灰摻量為40%、60%時其試塊強度等級小于lOMP,不滿足設(shè)計強度為10MP以上的要求,暫時不做考慮。2)從砂漿的流動性,抗壓強度,保水性,經(jīng)濟因素,環(huán)境等方面考慮選擇粉煤灰摻量為30%為最優(yōu)。最優(yōu)一組砂漿沖填在塊石中,形成的結(jié)實體強度大約是此砂漿試塊強度的1.3倍。3)在粉煤灰摻量相同的條件下,混合砂漿的稠度隨著水膠比的增大而變大,混合砂漿的抗壓強度隨著水膠比的增加呈降低趨勢,分層度則逐漸變��；在水膠比相同的條件下,隨著粉煤灰摻量的增加,混合砂漿的稠度在不斷增大,立方體的抗壓強度逐漸減小。4)結(jié)實體塊石粒徑對其強度也稍有影響,粒徑越大強度也在變大。
[Abstract]:In recent years, some experts suggested filling mortar stone dam construction technology, is a kind of innovation of technology of masonry dam. To sum up is that liquidity by mixed mortar, the impact force of its own gravity, to advance the well stirred, according to the liquidity ratio requirements of mixed mortar poured into the flat well in advance the hair stone, the gap between the free flow of mortar rubble to pile up quickly to complete the stone body. The key work of this construction method is simple and effective to have two aspects: 1) to ensure that the mixed mortar and stone have good overall performance, must be avoided as much as possible in the mixed mortar in filling production in the process of bubble or gap, ensure the mortar and aggregate segregation mortar can flow freely in the gap between the aggregate, to fill compaction effect of.2) in order to meet the mechanical properties and strength of mixed mortar and aggregate stone Size requirements must be fully guaranteed and stone mixture interface has good adhesion. The advantages of the respective materials of rockfill and mixed mortar and put forward their separate characteristics, fill strong mortar construction technology. Changed the ways of using raw materials, will have a new understanding of it all aspects of performance, so the construction technology of mortar stone hedge fill the main test following the first filling mortar stone construction technology of mixing mortar material ratio test: in order to meet the total amount of cementitious materials at the same time, the content change of fly ash (0%, 20%, 30%, 40%, 60%) and water binder ratio, designed 15 sets of experiments, including 3 group test of mixing coal ash. The basic test of mortar were summarized on fly ash content and water gel mixture Influence of mortar properties, the compressive strength of mixed mortar, water retention, and three aspects of liquidity into consideration, selected five groups meet the performance requirements of filling stone construction mortar mixed mortar, which is a set of experiments not admixture of fly ash. Then the above five groups of mixed mortar the simulation process, filling mortar into the field stone body. In the laboratory test, fill with glass box into the stone to fill in place of the outdoor environment. This experiment demonstrated that mixed mortar can meet the requirements of filling stone in rockfill. The test can further determine the required strength, mortar flow good mix. The optimum economic strong mortar compressive strength test body finally selecting a group of different ratio of aggregate size, the eighth groups of mixed mortar poured into a different size block stone size For filling mortar stone formation maintenance 28d test model 200mm * 200mm * 200mm, using WAW-2000D press do compressive strength test of stone body, were used to detect the stone body compressive strength. Through this study we can draw the following conclusions: 1) when the ratio of the three gradient used for test of water gel and the amount of fly ash was 20%, 30%, 40%, 60% of the mixed mortar consistency can meet the filling requirements. And when the amount of fly ash was 40%, 60% of the block strength is less than lOMP, does not meet the design strength of 10MP the above requirements, temporarily do not consider.2) from liquidity. The mortar compressive strength, water retention, economic factors, environment and other aspects to consider with 30% fly ash is optimal. A set of optimal mortar fill in block stone, fruiting body strength formation is about 1.3 times the mortar test block strength.3) in fly ash under the same conditions. Mixed mortar The consistency with the water cement ratio increases, the compressive strength of mortar mixed with water binder ratio decreased, delamination degree becomes smaller; the water cement ratio under the same conditions, with the increase of fly ash, mixed mortar consistency increasing, the compressive strength of the cube decreased.4) strong body block size on the strength of a slightly larger diameter impact strength is also larger.

【學(xué)位授予單位】：沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TV432

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