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CN-117843297-B - Modified CRT glass and ultra-high performance concrete

CN117843297BCN 117843297 BCN117843297 BCN 117843297BCN-117843297-B

Abstract

The application discloses a CRT glass reinforced ultra-high performance concrete and a preparation method thereof, wherein the modification process of modified CRT glass comprises the following steps of uniformly mixing CRT glass and modified liquid according to the mass ratio of 100 (21.2-24.4), piling up, collecting leakage liquid at the bottom of a CRT glass pile, circularly pouring the leakage liquid at the top of the CRT glass pile, aging for 4-6 days, wherein the pH value of the modified liquid is 9.2-9.8, the raw materials comprise water, cement and slaked lime, the modified CRT glass is easier to participate in hydration reaction in the concrete, the bonding interface is deeper, the bonding strength is higher, the inhibition of the addition of glass to the hydration reaction of the concrete is reduced, the strength is reduced, and the ultra-high performance concrete is added into the modified CRT glass, so that the ultra-high performance concrete has good fluidity and reduced mechanical property attenuation.

Inventors

  • GUO ZIZHENG
  • YE JIANFENG
  • XIANG PING
  • Ma Yanghong
  • MIAO JIANJUN

Assignees

  • 台州东部建材科技有限公司

Dates

Publication Date
20260512
Application Date
20231216

Claims (7)

  1. 1. A modified CRT glass is characterized in that the modified CRT glass is obtained by modification, and the modification process comprises the following steps: Uniformly mixing CRT glass and a modified liquid material according to the mass ratio of (21.2-24.4), stacking, aging for 4-6 days, collecting leakage liquid at the bottom of a CRT glass stack in the aging process, and then circularly pouring the leakage liquid at the top of the CRT glass stack; the raw materials of the modified liquid material comprise water, cement and slaked lime, wherein the mass ratio of the water to the cement is 1000:6.4, and the pH value of the modified liquid material is 9.2-9.8; The raw materials of the modified liquid material further comprise mica scraps, and the mass ratio of water to the mica scraps is 1000 (2.3-3.1).
  2. 2. The modified CRT glass of claim 1, wherein the mica flakes have a fineness of 50-60 nm.
  3. 3. The modified CRT glass of claim 1, wherein the raw materials of the modified liquid further comprise aluminum sulfate, and the mass ratio of the water to the aluminum sulfate is 1000 (0.8-1.4).
  4. 4. The modified CRT glass of claim 1, wherein the water is production washing circulating water, and the hardness of the production washing circulating water is 451-994 mg/L.
  5. 5. The modified CRT glass of claim 1, wherein the pH of the modified liquid is 9.4.
  6. 6. The ultra-high performance concrete is characterized by comprising the following raw materials in parts by weight: 1000 parts of cement and the weight of the cement, 1300-1445 Parts of fine aggregate, 250-282 Parts of silica fume, 200-220 Parts of reinforcing fiber, 160-180 Parts of water; The fine aggregate is sand and the modified CRT glass of any one of claims 1 to 5.
  7. 7. The ultra-high performance concrete of claim 6, further comprising 0.16-0.22 parts of water reducer.

Description

Modified CRT glass and ultra-high performance concrete Technical Field The application relates to building materials, in particular to modified CRT glass and ultra-high performance concrete. Background Ultra-high performance concrete, UHPC for short, is also known as reactive powder concrete. The UHPC is different from the common concrete in that the UHPC does not use coarse aggregate and only uses sand, silica fume and fiber (steel fiber or composite organic fiber) are needed to be used in the UHPC, the cement consumption is large, and the water-cement ratio is very low. The UHPC is different from the common concrete, so that the constituent materials in the UHPC are closely packed, the density of the constituent materials is close to the theoretical maximum packing density, and the UHPC has the durability and mechanical property far exceeding those of the common concrete. In the UHPC application process, a large amount of sand is consumed because coarse aggregate is not used, so that the harm of exploiting river sand to the ecological environment is reduced, CRT glass is adopted to replace the river sand in the prior art improvement, the cost of UHPC is reduced, and the limitation of sustainable development is relieved. However, the surface of the waste CRT glass is smoother than that of river sand, so that the bonding strength of a bonding phase and an interface transition area in concrete can be reduced compared with the river sand, the crushing value of the general waste CRT glass is far greater than that of the river sand, the strength of the waste CRT glass is weaker than that of the river sand, and under the influence of the two aspects, the compression strength and the breaking strength of UHPC (ultra high performance) are reduced to different degrees along with the increase of the substitution rate of the UHPC of the waste CRT glass instead of the river sand, namely, when the substitution rate reaches 100%, the compression strength of the UHPC is reduced by approximately 15%, and the breaking strength is reduced by approximately 17%. Disclosure of Invention In order to reduce the influence of the CRT glass on the mechanical properties of UHPC by replacing river sand, the CRT glass reinforced ultra-high performance concrete is provided. The first object of the present invention is achieved by the following technical solutions: A modified CRT glass is obtained by modifying CRT glass, and the modification process comprises the following steps: Uniformly mixing CRT glass and a modified liquid material according to the mass ratio of (21.2-24.4), stacking, aging for 4-6 days, collecting leakage liquid at the bottom of a CRT glass stack in the aging process, and then circularly pouring the leakage liquid at the top of the CRT glass stack; the raw materials of the modified liquid material comprise water, cement and slaked lime, wherein the mass ratio of the water to the cement is 1000 (4-7.2) (1.1-1.8), and the pH value of the modified liquid is 9.2-9.8. According to the technical scheme, cement in the modified liquid material is dispersed in enough water, water-soluble minerals are dissolved in the water, and gel particles are produced by reaction under the action of calcium hydroxide, the gel particles are contacted with the surface of glass and the inside of cracks after the modified liquid material is mixed with the glass, the gel particles are adhered and solidified on the inside and the surface of the cracks of the glass in the aging process, the compression resistance of the glass is enhanced, the surface of the glass is modified, the modified glass surface takes adhered gel substances as reaction sites and solidification points, the hydration reaction in concrete is easier to participate, the bonding interface with bonding is deeper, the bonding strength is higher, and the inhibition of the hydration reaction of the concrete by the addition of the glass and the strength reduction are weakened. Optionally, the raw materials of the modified liquid material further comprise mica scraps, wherein the mass ratio of water to the mica scraps is 1000 (2.3-3.1). By adopting the technical scheme, the glass is generally a new section generated by crushing, the surface of the new section is smooth, the adhesion difficulty of gel substances in the modified liquid material is high, when the CRT glass and the modified liquid material are mixed according to the mass ratio of 100 (21.2-24.4), due to the surface tension effect of water, mica scraps can be attached to the smooth section of the glass, the joint between the edges of the mica scraps and the section of the glass forms a height difference, the gel substances are more easily accumulated and adhered to the section of the glass, the adhesion rate of the gel substances is improved, the glass is strengthened to participate in the hydration reaction of concrete, and the inhibition of the addition of the glass to the hydration reaction of the concrete and the st