本文選題：砂漿 + 高吸水樹脂　； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：高吸水樹脂(Super Absorbent Polymer,SAP)內(nèi)養(yǎng)護(hù)是一種常用的混凝土材料內(nèi)養(yǎng)護(hù)方法。現(xiàn)有研究認(rèn)為SAP內(nèi)養(yǎng)護(hù)能夠改善混凝土材料的多方面性能,包括降低早期收縮、減少開裂、提高強(qiáng)度、增加流動度等。SAP通過在混凝土內(nèi)部釋放水分,提高漿體早期硬化過程和長期服役過程中的內(nèi)部濕度,達(dá)到從內(nèi)部養(yǎng)護(hù)混凝土的效果。然而,SAP不僅在混凝土養(yǎng)護(hù)階段會釋放養(yǎng)護(hù)水分,在拌和期間也會與漿體進(jìn)行水分交換,這一過程會造成漿體水灰比的改變,混凝土收縮、強(qiáng)度、流動度等性能也隨之發(fā)生變化�，F(xiàn)有研究往往將水灰比變化的影響結(jié)果計(jì)入內(nèi)養(yǎng)護(hù)的作用效果中,難以準(zhǔn)確分析真實(shí)的內(nèi)養(yǎng)護(hù)作用機(jī)理,導(dǎo)致現(xiàn)有研究評價(jià)SAP的內(nèi)養(yǎng)護(hù)效果時出現(xiàn)大量分歧。本論文針對這一問題,基于水灰比的修正方法研究SAP的內(nèi)養(yǎng)護(hù)真實(shí)的作用效果。通過流動度平衡試驗(yàn)精確測量出SAP在不同水灰比凈漿中的吸水量,對不同SAP摻量下漿體的真實(shí)水灰比進(jìn)行修正;通過材料強(qiáng)度、水分含量、自收縮、水化熱試驗(yàn),在排除SAP改變漿體水灰比作用的基礎(chǔ)上,探討真實(shí)的SAP內(nèi)養(yǎng)護(hù)作用對不同水灰比砂漿力學(xué)性能、收縮性能、水化進(jìn)程的影響機(jī)理。主要工作和結(jié)論如下:(1)進(jìn)行了凈漿流動度試驗(yàn),準(zhǔn)確測量了 SAP在不同水灰比漿體中的吸水量,分析了水灰比、摻加方式、SAP粒徑對其在漿體中的真實(shí)吸水量的影響規(guī)律。結(jié)果表明:不論干摻還是預(yù)濕,SAP與漿體的水分交換在5min之內(nèi)基本完成,且隨著水灰比的增加,SAP的吸水率逐漸增大;干摻SAP的吸水率要大于預(yù)濕;小粒徑SAP的吸水率高于大粒徑SAP。(2)進(jìn)行了四個水灰比砂漿的自收縮和含水率試驗(yàn),分析了水灰比、SAP摻量和粒徑對漿體自收縮和水分含量的影響規(guī)律。結(jié)果表明:SAP能有效減小不同水灰比砂漿的自收縮,在最佳摻量下的減縮效果都在80%以上;對于0.21和0.26水灰比的砂漿試件,SAP摻量越大減縮效果越好;對于0.31和0.36水灰比的砂漿試件,當(dāng)SAP摻量超過0.2%時,繼續(xù)提高SAP摻量減縮效果不再增加。SAP主要在3d內(nèi)釋放出水分,提高砂漿的水分含量,降低自收縮的發(fā)展速率。SAP摻量相同時,水灰比越低,自干燥越嚴(yán)重,所需的內(nèi)養(yǎng)護(hù)水分也就越多,所以低水灰比的砂漿對內(nèi)養(yǎng)護(hù)的需求和依賴更大。SAP粒徑對自收縮和含水率的影響較小。(3)進(jìn)行了四個水灰比砂漿的強(qiáng)度和水化熱試驗(yàn),分析了水灰比、SAP摻量和粒徑對強(qiáng)度和水化進(jìn)程的影響規(guī)律。結(jié)果表明:大部分情況下,摻入SAP會降低混凝土的力學(xué)性能,且SAP摻量越高,抗壓、抗折強(qiáng)度降低越顯著;但對于低水灰比的漿體,適量的SAP可能提高材料強(qiáng)度;在排除水灰比變化對水化進(jìn)程的影響之后發(fā)現(xiàn),SAP對水泥水化進(jìn)程的影響較小;SAP摻量相同時,漿體的水灰比越低,SAP內(nèi)養(yǎng)護(hù)對水化進(jìn)程的促進(jìn)作用越明顯,對強(qiáng)度的降低程度也越小;大粒徑SAP對水泥水化的促進(jìn)作用略微優(yōu)于小粒徑SAP,因而大粒徑SAP對強(qiáng)度的降低作用略小于小粒徑SAP。
[Abstract]:The maintenance of high water absorbent resin (Super Absorbent Polymer, SAP) is a common curing method for concrete materials. Existing research holds that the internal curing of SAP can improve the properties of concrete materials, including reducing early shrinkage, reducing cracking, increasing strength, increasing flow degree and so on,.SAP can release water by releasing water in concrete and improve slurry. The internal humidity of the early hardening process and the long service process can achieve the effect of curing the concrete from the interior. However, SAP will not only release the moisture of the concrete during the concrete curing period, but also exchange the water with the slurry during the mixing period. This process will cause the change of the water cement ratio of the slurry, the shrinkage, strength, and the fluidity of concrete. The existing research often takes the effect of the change of water cement ratio into the effect of internal maintenance, and it is difficult to accurately analyze the true internal curing mechanism, which leads to a large number of differences when the existing research and evaluation of the internal curing effect of SAP. This paper studies the internal maintenance of SAP based on the modified method of water cement ratio. Through the flow balance test, the water absorption of SAP in different water cement ratio is accurately measured, and the real water cement ratio of the slurry under different SAP content is corrected. On the basis of the material strength, water content, autogenous shrinkage, hydration heat test, and the effect of removing the water cement ratio of the SAP to the slurry, the real SAP is discussed. The effect of curing on the mechanical properties, shrinkage properties and hydration process of different cement mortar with different water cement ratio is studied. The main work and conclusion are as follows: (1) the water absorption of SAP in different water cement slurry is measured accurately, and the effect of water cement ratio, additive formula and SAP particle size on the real water absorption in the slurry is analyzed. The results show that water exchange between SAP and slurry is basically completed within 5min, regardless of dry or pre wetting, and with the increase of water cement ratio, the water absorption of SAP increases gradually, and the water absorption of dry doped SAP is greater than that of pre wetting; the water absorption of SAP with small particle size is higher than that of large particle size SAP. (2), and the self shrinkage and moisture content of water cement mortar are tested. The effects of water cement ratio, SAP content and particle size on the autogenous shrinkage and water content of the slurry are analyzed. The results show that SAP can effectively reduce the self shrinkage of different water cement mortar, and the reduction effect is more than 80% under the best dosage; for the mortar specimens with 0.21 and 0.26 water cement ratio, the greater the SAP content is, the better the shrinkage effect is, and for 0.31 and 0.36 water ash. When the ratio of mortar is more than 0.2%, when the content of SAP is more than 0.2%, the decreasing effect of SAP content will no longer increase the water content of.SAP mainly in 3D, increase the moisture content of the mortar and reduce the development rate of the self shrinkage, the lower the.SAP content, the lower the water cement ratio, the more serious the moisture content in the internal curing, and the sand with low water cement ratio. The demand and dependence on the internal curing of the slurry is greater than the effect of the.SAP particle size on the autogenous shrinkage and water content. (3) the strength and hydration heat test of four cement mortar are carried out. The effects of water cement ratio, SAP content and particle size on the strength and hydration process are analyzed. The results show that the mechanical properties of concrete will be reduced by adding SAP in large part of the case. The higher the SAP content, the more significant the compression and flexural strength decrease; but for the slurry with low water cement ratio, a proper amount of SAP may improve the strength of the material. After removing the effect of the change of water cement ratio on the hydration process, the effect of SAP on the hydration process of cement is less; at the same time, the water cement ratio of the slurry is lower, and the process of curing in SAP is the process of hydration. The more obvious the promotion effect is, the smaller the degree of strength reduction is, the larger particle size SAP has a slightly better effect on cement hydration than the small particle size SAP, so the effect of the large particle size SAP on the strength is slightly less than the small size SAP..
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528

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