CN102849979B - Application of agricultural drought-resisting and water-retaining material as water-retention-type warm-mixing additive - Google Patents
Application of agricultural drought-resisting and water-retaining material as water-retention-type warm-mixing additive Download PDFInfo
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- CN102849979B CN102849979B CN201210337240.1A CN201210337240A CN102849979B CN 102849979 B CN102849979 B CN 102849979B CN 201210337240 A CN201210337240 A CN 201210337240A CN 102849979 B CN102849979 B CN 102849979B
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Abstract
The invention relates to an application of an agricultural drought-resisting and water-retaining material as a water-retention-type warm-mixing additive, and belongs to the technical field of warm-mixing additives. The agricultural drought-resisting and water-retaining material is an agricultural solid powdery polyacrylic acid type drought-resisting and water-retaining material. Required particle sizes are above 40 meshes, and particles with larger sizes need a grinding treatment. Before application, the drought-resisting and water-retaining material is in a dried state. The agricultural solid powdery polyacrylic acid type drought-resisting and water-retaining material is placed in water and is sufficiently mixed by stirring; and the mixture is sealed and is subjected to standing until water is completely adsorbed, such that the water-retention-type warm-mixing additive is obtained. According to the invention, 1 part by mass of the agricultural solid powdery polyacrylic acid type drought-resisting and water-retaining material and 20-30 parts by mass of water are adopted. With the application provided by the invention, energy loss in mineral aggregate and asphalt heating and in mixture mixing and compacting processes are saved, and carbon emission during fuel combustion is correspondingly reduced.
Description
Technical field
The present invention relates to a kind of civil engineering material, especially using the anti drought and water reserving material of agricultural use as water-maintaining warm-mixing additive and using method, belong to warm-mixing additive technical field.
Background technology
The good characteristics such as bituminous concrete pavement is little with its driving vibration, noise is low, open to traffic is fast, simple maintenance in China's road surface structure in occupation of dominant position, especially high-grade highway medium pitch surface layer highway proportion is very large, the high grade highway pavement that China is built, approximately have according to incompletely statistics 80% for bituminous concrete pavement.
Bituminous concrete pavement in China's Road construction all adopts traditional hot-mixed asphaltic concrete HMA (Hot Mixture Asphalt) substantially.It is that pitch is heated to 150 ℃ of left and right from normal temperature, and mineral aggregate is heated to 160～180 ℃, and then pitch and mineral aggregate are mixed and stirred under the high temperature of 160 ℃, and the HMA temperature after mixing and stirring is not less than 150 ℃.Temperature when paving and rolling is not less than 120 ℃.Pitch and mineral aggregate are heated to so high temperature, not only will consume a large amount of energy, and also can give off a large amount of waste gas and dust in the process of producing and constructing, have a strong impact on the healthy of environmental quality around and workmen.Thus, the consequence of using HMA is exactly the destruction of environment, the dwindling of the waste of the energy and human survival circle, and the development of Zhe Yu China is green, continuable road, and the aim of energy-saving and emission-reduction runs in the opposite direction.Therefore, be extremely necessary to study asphalt a kind of green, environmental protection and replace HMA, make it can keep the using character the same with HMA, again save energy and protection of the environment fully.
Therefore, a kind of warm-mixed asphalt concrete WMA of environment-friendly type (Warm Mix Asphalt) starts to be developed and is used for substituting traditional hot-mixed asphaltic concrete.So-called WMA makes asphalt at relatively low temperature, mix and stir and to construct.With regard to current state of the art, the temperature of mixing and stirring of WMA generally remains on 125～145 ℃, and paving with the temperature on compacting road surface is 80～100 ℃, and with respect to HMA, temperature has reduced between 20～40 ℃, and the reduction of temperature has brought plurality of advantages.It has not only reduced energy consumption, reduced the loss of production unit, reduce in process of production aging of bituminous cements, and the discharge that has alleviated a large amount of flue gases and other objectionable impuritiess, ensured construction environment, safeguarded the healthy of workmen, but also open to traffic and extend construction seasons faster.Thus, the research and development of warm-mixed asphalt green construction technology have become the development trend under the large theme of current energy-saving and emission-reduction.
In the world, research about warm mix technology mainly contains San great technology group: the one, and organic viscosity reduction type warm mix technology, this technology is mainly in pitch, to add the organic chemistry product that a kind of fusing point is lower, it is mainly hard wax, it can improve the viscosity of pitch in the time of 60 ℃, reduce the viscosity of pitch in the time of 135 ℃, be mainly represented as Sasobit technology; The 2nd, foamed asphalt warm mix technology, this is a kind ofly by introduce gas in pitch, to make asphalt foaming, improves the method for mix workability, main representative has WAM-Foam technology and Aspha-Min technology; Finally a kind of is emulsion dispersion pitch warm mix technology, and this technology, mainly based on surface active process, improves the workability of mix by falling low molecular surface tension, and main representative has the Evotherm warm mix technology on U.S.'s benefit road.
China's warm mix technology is started late, and above-mentioned warm mix technology is applied to use for reference or quoted in correlative study is main, take desk research and experimental engineering as main, and warm mix technology is not also applied in the middle of extensive road engineering.
Summary of the invention
The object of the invention is for above-mentioned background, using the polyacrylic anti drought and water reserving material of the solid powdery of agricultural use as a kind of novel warm-mixing additive materials'use, i.e. water-maintaining warm-mixing additive.
The anti drought and water reserving material of agricultural use is as the application of water-maintaining warm-mixing additive, it is characterized in that, the polyacrylic anti drought and water reserving material of the solid powdery that the anti drought and water reserving material of agricultural use is agriculture use, require particle diameter more than 40 orders, the need that particle diameter is larger carry out milled processed, and need to make it in drying regime before using; The polyacrylic anti drought and water reserving material of the solid powdery of agricultural use is put into water, stir, sealing and standing, until moisture is completely absorbed, obtains water-maintaining warm-mixing additive; Polyacrylic anti drought and water reserving material 1 mass parts of the solid powdery of agriculture use wherein, water 20-30 mass parts.The water using is common drinking public water supply.
Further, the anti drought and water reserving material of agriculture use is the using method in bituminous concrete warm mix process as water-maintaining warm-mixing additive, it is characterized in that, specifically comprises the following steps:
(1) using the polyacrylic anti drought and water reserving material of the solid powdery of agricultural use as water-maintaining warm-mixing additive, require particle diameter more than 40 orders, the need that particle diameter is larger carry out milled processed, and need to make it in drying regime before using; The polyacrylic anti drought and water reserving material of the solid powdery of agricultural use is put into water, stir, sealing and standing, until moisture is completely absorbed, obtains water-maintaining warm-mixing additive; Polyacrylic anti drought and water reserving material 1 mass parts of the solid powdery of agriculture use wherein, water 20-30 mass parts, the water using in invention is common drinking public water supply.
(2) first hot mineral aggregate is put into preheated bituminous concrete mixing pot, the warm-mixing additive and the heated bitumen that in mix pot, add step (1) to prepare subsequently, fully after mix, in mix pot, add hot breeze again, last abundant mix again, wherein, the temperature of above-mentioned mineral aggregate, mix and stir a pot preheating temperature, fully mix temperature during mix, asphalt temperature, breeze temperature respectively with respect to the temperature of corresponding mineral aggregate in hot asphalt process, mix and stir a pot preheating temperature, abundant mix temperature, asphalt temperature, the low 15-25 ℃ of breeze temperature during mix; Wherein the quality proportioning of warm-mixing additive and pitch is 100 parts of pitches, warm-mixing additive 1-7 part.
Its principle that realizes warm mix is: between this water-maintaining warm-mixing additive molecule, be tridimensional network, on reticulated structure, there are many hydrophilic functional groups as carboxyl (COO-), hydroxyl (OH) etc., when it contacts with water, hydrophilic functional group's ionization of its molecular surface also becomes hydrogen bond with water molecules, in this way a large amount of moisture of sticking.In this course, network chain By Electrolysis matter makes to produce osmotic potential difference between electrolyte solution in polymkeric substance and outside moisture, thereby makes outside moisture constantly enter intramolecule.Meanwhile, because the ion on polymkeric substance is met water electrolysis, positive ion is unbound state, and negative ion group is still fixed on network chain, and adjacent negative ion produces repulsion, causes the expansion of macromolecule network structure, in the cancellated mesh of molecule, enters a large amount of moisture.By these three processes, make additive absorption in conjunction with a certain proportion of water, realize when asphalt temperature reaches 120 ℃ of left and right, a small amount of additive is distributed in the middle of heated bitumen by the powerful dispersive ability of mix, because making water in additive, high temperature discharges with the form of gas, thereby produce a large amount of bubbles, make pitch volume expand several times, reduce thus asphalt viscosity, increase mix workability, to reach the object that realizes warm mix.
Water-maintaining warm-mixing additive of the present invention can reduce asphalt mixture mixing and compacting temperature 15-25 ℃.Take 70# pitch, AC-13C asphalt is example, test specimen voidage after hitting in fact by Marshall method is below 6%, Marshall stability is greater than 8KN, residual stability is greater than 80%, dynamic stability is greater than 1000 times/mm, cleavage strength is more than 2.0MPa, each pavement performance index of Warm-Mix Bitumen Mixture can meet China < < standard specification for construction and acceptance of highway asphalt pavement > > requirement, is applicable to asphalt road surface construction project.
Tool of the present invention has the following advantages:
1. by reducing asphalt mixture mixing and compacting temperature, thereby saved the energy waste in mineral aggregate, asphalt heating and compound mix and compacting process, also the corresponding carbon emission amount producing while having reduced fuel combustion.
2. reduced glance coal in asphalt mixture mixing, decking and rolling process and the discharge of obnoxious flavour, obnoxious flavour comprises carbon monoxide (CO), carbonic acid gas (CO
2), sulfurous gas (SO
2), nitrogen oxide type (NO
x) etc., improved construction environment, safeguarded the healthy of workmen, and owing to having reduced the pollution of flue dust to environment, made it be specially adapted to the construction operation of long tunnel asphalt pavement.
3. the Warm-Mix Bitumen Mixture pavement performance that uses the present invention to make can reach the level of corresponding hot-mix asphalt mixture.
4. owing to having reduced mix and construction temperature, Warm-Mix Bitumen Mixture can be constructed at lower temperature, can accelerate open to traffic, and on average extends the construction seasons time of 1 month, has reduced the idleness of equipment of relevant enterprise.
5. because asphalt heating temperature is higher, ageing of asphalt is more serious, compares with hot-mix asphalt mixture, and the reduction of construction temperature reduces the aging of pitch.
6. starting material of the present invention are all commercially available prod, and starting material are easy to get, and cost is lower, are easy to promote.
Accompanying drawing explanation
The mineral aggregate formate gradation composition curve of Figure 1A C-13C asphalt.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is described further, but the present invention is not limited to following examples.
The starting material source that embodiment and comparative example are used is shown in Table 1.
Table 1 starting material source
Comparative example 1: matrix pitch heating and melting, do not add warm-mixing agent of the present invention.
Embodiment 1-7
Using the polyacrylic anti drought and water reserving material of the solid powdery of agricultural use as water-maintaining warm-mixing additive, require particle diameter more than 40 orders, the need that particle diameter is larger carry out milled processed, and need to make it in drying regime before using; The polyacrylic anti drought and water reserving material of the solid powdery of agricultural use is put into water, stir, sealing and standing, until moisture is completely absorbed, obtains water-maintaining warm-mixing additive; Polyacrylic anti drought and water reserving material 1 mass parts of the solid powdery of agriculture use wherein, water 20-30 mass parts, the water using in invention is common drinking public water supply, then matrix pitch heating and melting is mixed with above-mentioned warm-mixing agent.Wherein the quality proportioning of warm-mixing additive and pitch is 100 parts of pitches, warm-mixing additive 1-7 part.The concrete material consumption of above-described embodiment 1-7 and result test are in Table 2;
Material usage ratio and the asphalt viscosity of table 2 embodiment and comparative example
Comparative example 2 does not add warm-mixing agent of the present invention for conventional hot asphalt, carry out heat and mix process, first thick, the thin mineral aggregate of heat is put into preheated bituminous concrete mixing pot, in mix pot, add heated bitumen subsequently, mix adds hot breeze after 90 seconds again in mix pot, last mix 90 seconds, said temperature is conventional heat and mixes temperature, in Table 3.
Comparative example 3 does not add warm-mixing agent of the present invention for conventional hot mix asphalt material, according to warm mix temperature of the present invention, carry out mix, first thick, the thin mineral aggregate of heat is put into preheated bituminous concrete mixing pot, in mix pot, add heated bitumen subsequently, mix adds hot breeze after 90 seconds again in mix pot, last mix 90 seconds, said temperature all adopts warm mix temperature of the present invention, in Table 3.
Embodiment 8-10
(1) using the polyacrylic anti drought and water reserving material of the solid powdery of agricultural use as water-maintaining warm-mixing additive, require particle diameter more than 40 orders, the need that particle diameter is larger carry out milled processed, and need to make it in drying regime before using; The polyacrylic anti drought and water reserving material of the solid powdery of agricultural use is put into water, stir, sealing and standing, until moisture is completely absorbed, obtains water-maintaining warm-mixing additive; Polyacrylic anti drought and water reserving material 1 mass parts of the solid powdery of agriculture use wherein, water 20 mass parts, the water using in invention is common drinking public water supply.
(2) first thick, the thin mineral aggregate of heat is put into preheated bituminous concrete mixing pot, the warm-mixing additive that adds step (1) to prepare in mix pot subsequently, put into heated bitumen, mix adds hot breeze after 90 seconds again in mix pot again, last mix 90 seconds.
Wherein, mix and stir a pot preheating temperature, mix temperature, asphalt heating temperature, mineral aggregate and breeze Heating temperature as shown in table 3; Wherein the quality proportioning of warm-mixing additive and pitch is 100 parts of pitches, warm-mixing additive 3-7 part.
The asphalt mixture gradation that embodiment 8-10 and comparative example 2-3 adopt is AC-13C, and as shown in Figure 1, pitch is selected 70# matrix pitch, and best bitumen aggregate ratio is selected by testing, and is all 4.8%.
Embodiment 8-9 and comparative example 2 are according to equal-volume principle, application voidage-temperature curve, and using and control index voidage 5% corresponding mix and compacting temperature as mix and the compacting temperature of Warm-Mix Bitumen Mixture.
Linear formula: VV=at+b
In formula: VV is voidage, %; T is centigradetemperature, ℃; A, b are regression coefficient.
The concrete material consumption of embodiment 8-10 is in Table 3, and result is tested in Table 3 and 4.
The voidage of table 3 embodiment and comparative example and the mix of reckoning and compacting temperature
The warm-mixing additive of being prepared by the final the present invention of the comprehensive analysis of table 3 can reduce mix and 20 ℃ of left and right of compacting temperature.
The Asphalt Mixture Performance index experimental result of embodiment 8-10 and comparative example 2-3 is as shown in table 4.
The pavement performance index experimental result of table 4 embodiment and comparative example
Claims (2)
1. the anti drought and water reserving material of agriculture use is as the application of water-maintaining warm-mixing additive, it is characterized in that, the polyacrylic anti drought and water reserving material of the solid powdery that the anti drought and water reserving material of agricultural use is agriculture use, require particle diameter more than 40 orders, the need that particle diameter is larger carry out milled processed, and need to make it in drying regime before using; The polyacrylic anti drought and water reserving material of the solid powdery of agricultural use is put into water, stir, sealing and standing, until moisture is completely absorbed, obtains water-maintaining warm-mixing additive; Polyacrylic anti drought and water reserving material 1 mass parts of the solid powdery of agriculture use wherein, water 20-30 mass parts.
The anti drought and water reserving material of agriculture use as water-maintaining warm-mixing additive the using method in bituminous concrete warm mix process, it is characterized in that, specifically comprise the following steps:
(1) using the polyacrylic anti drought and water reserving material of the solid powdery of agricultural use as water-maintaining warm-mixing additive, require particle diameter more than 40 orders, the need that particle diameter is larger carry out milled processed, and need to make it in drying regime before using; The polyacrylic anti drought and water reserving material of the solid powdery of agricultural use is put into water, stir, sealing and standing, until moisture is completely absorbed, obtains water-maintaining warm-mixing additive; Polyacrylic anti drought and water reserving material 1 mass parts of the solid powdery of agriculture use wherein, water 20-30 mass parts;
(2) first hot mineral aggregate is put into preheated bituminous concrete mixing pot, the warm-mixing additive and the heated bitumen that in mix pot, add step (1) to prepare subsequently, fully after mix, in mix pot, add hot breeze again, last abundant mix again, wherein, the temperature of above-mentioned mineral aggregate, mix and stir a pot preheating temperature, fully mix temperature during mix, asphalt temperature, breeze temperature respectively with respect to the temperature of corresponding mineral aggregate in hot asphalt process, mix and stir a pot preheating temperature, abundant mix temperature, asphalt temperature, the low 15-25 ℃ of breeze temperature during mix; Wherein the quality proportioning of warm-mixing additive and pitch is 100 parts of pitches, warm-mixing additive 1-7 part.
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| CN102408733B (en) * | 2011-09-30 | 2013-09-11 | 长安大学 | Warm mix asphalt viscosity breaking agent |
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