多源集料水泥穩(wěn)定碎石水化過程研究

摘 要：集料是水泥穩(wěn)定碎石的主要組成材料之一，集料化學(xué)組成特性對水泥穩(wěn)定碎石初期水化存在潛在影響。該研究初選石灰?guī)r、白云巖、玄武巖、片麻巖和閃長巖5種不同來源集料，并基于CemGEMS在統(tǒng)一環(huán)境和水泥條件下進(jìn)行水化模擬分析。在此基礎(chǔ)上，以石灰?guī)r集料為例對比分析水泥水化過程中各類水化產(chǎn)物的生成演變規(guī)律，進(jìn)而比較不同集料條件下鈣礬石、水化硅酸鹽等關(guān)鍵產(chǎn)物的生成速率，并統(tǒng)計分析集料化學(xué)成分與水化產(chǎn)物生成之間的內(nèi)在關(guān)系。結(jié)果表明，相比玄武巖、閃長巖等酸性集料，石灰?guī)r、白云巖等高碳酸鹽類集料條件下鈣礬石生成速率相對緩慢，且水化硅酸鹽生成量相對較少；集料SiO2含量與水化硅酸鹽生成量呈線性關(guān)系，SiO2含量越高則水泥水化生成的水化硅酸鹽越多。

關(guān)鍵詞：多源集料；組成成分；水泥水化；數(shù)值計算；過程分析

中圖分類號：U416.1 文獻(xiàn)標(biāo)志碼：A 文章編號：2095-2945（2024）31-0092-04

Abstract： Aggregate is one of the main components of cement stabilized gravel， and the chemical composition characteristics of aggregate have a potential impact on the initial hydration of cement stabilized gravel. In this study， five different sources of aggregate， including limestone， dolomite， basalt， gneiss， and diorite， were selected， and hydration simulation analysis was carried out based on CemGEMS under a unified environment and cement conditions. On this basis， taking limestone aggregate as an example， the formation and evolution laws of various hydration products during cement hydration were compared and analyzed， and then the formation rates of key products such as ettringite and hydrated silicate under different aggregate conditions were compared.， and the intrinsic relationship between the chemical composition of aggregate and the formation of hydration products was statistically analyzed. The results show that compared with acidic aggregates such as basalt and diorite， ettringite formation rate is relatively slow under high carbonate aggregate conditions such as limestone and dolomite， and the amount of hydrated silicate formation is relatively small; the SiO2 content of aggregate is linearly related to the amount of hydrated silicate formation. The higher the SiO2 content， the more hydrated silicate formed by cement hydration.

Keywords： multi-source aggregate; composition; cement hydration; numerical calculation; process analysis

水泥穩(wěn)定碎石作為一種高性能建筑材料，由于其具有高承載力、耐久性優(yōu)及價格低廉等優(yōu)勢，致使其在現(xiàn)代工程領(lǐng)域成為一種不可或缺的材料。隨著社會對環(huán)境保護(hù)意識的提高及對環(huán)境友好型建筑材料需求的增長，多源集料水泥穩(wěn)定碎石的開發(fā)和應(yīng)用展現(xiàn)出了更大的研究空間和潛力[1]。多源集料水泥穩(wěn)定碎石是以水泥為穩(wěn)定劑混合多種不同來源的碎石、砂礫以及其他補(bǔ)充材料經(jīng)拌和、壓實(shí)與養(yǎng)護(hù)后形成的具有高穩(wěn)定性的復(fù)合材料，其大規(guī)模使用有助于降低廢舊集料對環(huán)境的影響并實(shí)現(xiàn)資源的最大化利用。……